"""Automatically pan, tilt, and zoom on detected objects via onvif.""" import copy import logging import os import queue import threading import time from collections import deque from functools import partial from multiprocessing.synchronize import Event as MpEvent import cv2 import numpy as np from norfair.camera_motion import ( HomographyTransformationGetter, MotionEstimator, TranslationTransformationGetter, ) from frigate.comms.dispatcher import Dispatcher from frigate.config import CameraConfig, FrigateConfig, ZoomingModeEnum from frigate.const import ( AUTOTRACKING_MAX_AREA_RATIO, AUTOTRACKING_MAX_MOVE_METRICS, AUTOTRACKING_MOTION_MAX_POINTS, AUTOTRACKING_MOTION_MIN_DISTANCE, AUTOTRACKING_ZOOM_EDGE_THRESHOLD, AUTOTRACKING_ZOOM_IN_HYSTERESIS, AUTOTRACKING_ZOOM_OUT_HYSTERESIS, CONFIG_DIR, ) from frigate.ptz.onvif import OnvifController from frigate.types import PTZMetricsTypes from frigate.util.builtin import update_yaml_file from frigate.util.image import SharedMemoryFrameManager, intersection_over_union logger = logging.getLogger(__name__) def ptz_moving_at_frame_time(frame_time, ptz_start_time, ptz_stop_time): # Determine if the PTZ was in motion at the set frame time # for non ptz/autotracking cameras, this will always return False # ptz_start_time is initialized to 0 on startup and only changes # when autotracking movements are made return (ptz_start_time != 0.0 and frame_time > ptz_start_time) and ( ptz_stop_time == 0.0 or (ptz_start_time <= frame_time <= ptz_stop_time) ) class PtzMotionEstimator: def __init__( self, config: CameraConfig, ptz_metrics: dict[str, PTZMetricsTypes] ) -> None: self.frame_manager = SharedMemoryFrameManager() self.norfair_motion_estimator = None self.camera_config = config self.coord_transformations = None self.ptz_metrics = ptz_metrics self.ptz_start_time = self.ptz_metrics["ptz_start_time"] self.ptz_stop_time = self.ptz_metrics["ptz_stop_time"] self.ptz_metrics["ptz_reset"].set() logger.debug(f"{config.name}: Motion estimator init") def motion_estimator(self, detections, frame_time, camera): # If we've just started up or returned to our preset, reset motion estimator for new tracking session if self.ptz_metrics["ptz_reset"].is_set(): self.ptz_metrics["ptz_reset"].clear() # homography is nice (zooming) but slow, translation is pan/tilt only but fast. if ( self.camera_config.onvif.autotracking.zooming != ZoomingModeEnum.disabled ): logger.debug(f"{camera}: Motion estimator reset - homography") transformation_type = HomographyTransformationGetter() else: logger.debug(f"{camera}: Motion estimator reset - translation") transformation_type = TranslationTransformationGetter() self.norfair_motion_estimator = MotionEstimator( transformations_getter=transformation_type, min_distance=AUTOTRACKING_MOTION_MIN_DISTANCE, max_points=AUTOTRACKING_MOTION_MAX_POINTS, ) self.coord_transformations = None if ptz_moving_at_frame_time( frame_time, self.ptz_start_time.value, self.ptz_stop_time.value ): logger.debug( f"{camera}: Motion estimator running - frame time: {frame_time}" ) frame_id = f"{camera}{frame_time}" yuv_frame = self.frame_manager.get( frame_id, self.camera_config.frame_shape_yuv ) frame = cv2.cvtColor(yuv_frame, cv2.COLOR_YUV2GRAY_I420) # mask out detections for better motion estimation mask = np.ones(frame.shape[:2], frame.dtype) detection_boxes = [x[2] for x in detections] for detection in detection_boxes: x1, y1, x2, y2 = detection mask[y1:y2, x1:x2] = 0 # merge camera config motion mask with detections. Norfair function needs 0,1 mask mask = np.bitwise_and(mask, self.camera_config.motion.mask).clip(max=1) # Norfair estimator function needs color so it can convert it right back to gray frame = cv2.cvtColor(frame, cv2.COLOR_GRAY2BGRA) try: self.coord_transformations = self.norfair_motion_estimator.update( frame, mask ) except Exception: # sometimes opencv can't find enough features in the image to find homography, so catch this error # https://github.com/tryolabs/norfair/pull/278 logger.warning( f"Autotracker: motion estimator couldn't get transformations for {camera} at frame time {frame_time}" ) self.coord_transformations = None try: logger.debug( f"{camera}: Motion estimator transformation: {self.coord_transformations.rel_to_abs([[0,0]])}" ) except Exception: pass self.frame_manager.close(frame_id) return self.coord_transformations class PtzAutoTrackerThread(threading.Thread): def __init__( self, config: FrigateConfig, onvif: OnvifController, ptz_metrics: dict[str, PTZMetricsTypes], dispatcher: Dispatcher, stop_event: MpEvent, ) -> None: threading.Thread.__init__(self) self.name = "ptz_autotracker" self.ptz_autotracker = PtzAutoTracker( config, onvif, ptz_metrics, dispatcher, stop_event ) self.stop_event = stop_event self.config = config def run(self): while not self.stop_event.wait(1): for camera, camera_config in self.config.cameras.items(): if not camera_config.enabled: continue if camera_config.onvif.autotracking.enabled: self.ptz_autotracker.camera_maintenance(camera) else: # disabled dynamically by mqtt if self.ptz_autotracker.tracked_object.get(camera): self.ptz_autotracker.tracked_object[camera] = None self.ptz_autotracker.tracked_object_history[camera].clear() logger.info("Exiting autotracker...") class PtzAutoTracker: def __init__( self, config: FrigateConfig, onvif: OnvifController, ptz_metrics: PTZMetricsTypes, dispatcher: Dispatcher, stop_event: MpEvent, ) -> None: self.config = config self.onvif = onvif self.ptz_metrics = ptz_metrics self.dispatcher = dispatcher self.stop_event = stop_event self.tracked_object: dict[str, object] = {} self.tracked_object_history: dict[str, object] = {} self.tracked_object_metrics: dict[str, object] = {} self.object_types: dict[str, object] = {} self.required_zones: dict[str, object] = {} self.move_queues: dict[str, object] = {} self.move_queue_locks: dict[str, object] = {} self.move_threads: dict[str, object] = {} self.autotracker_init: dict[str, object] = {} self.move_metrics: dict[str, object] = {} self.calibrating: dict[str, object] = {} self.intercept: dict[str, object] = {} self.move_coefficients: dict[str, object] = {} self.zoom_factor: dict[str, object] = {} # if cam is set to autotrack, onvif should be set up for camera, camera_config in self.config.cameras.items(): if not camera_config.enabled: continue self.autotracker_init[camera] = False if ( camera_config.onvif.autotracking.enabled and camera_config.onvif.autotracking.enabled_in_config ): self._autotracker_setup(camera_config, camera) def _autotracker_setup(self, camera_config, camera): logger.debug(f"{camera}: Autotracker init") self.object_types[camera] = camera_config.onvif.autotracking.track self.required_zones[camera] = camera_config.onvif.autotracking.required_zones self.zoom_factor[camera] = camera_config.onvif.autotracking.zoom_factor self.tracked_object[camera] = None self.tracked_object_history[camera] = deque( maxlen=round(camera_config.detect.fps * 1.5) ) self.tracked_object_metrics[camera] = { "max_target_box": AUTOTRACKING_MAX_AREA_RATIO ** (1 / self.zoom_factor[camera]) } self.calibrating[camera] = False self.move_metrics[camera] = [] self.intercept[camera] = None self.move_coefficients[camera] = [] self.move_queues[camera] = queue.Queue() self.move_queue_locks[camera] = threading.Lock() if not self.onvif.cams[camera]["init"]: if not self.onvif._init_onvif(camera): logger.warning(f"Unable to initialize onvif for {camera}") camera_config.onvif.autotracking.enabled = False self.ptz_metrics[camera]["ptz_autotracker_enabled"].value = False return if "pt-r-fov" not in self.onvif.cams[camera]["features"]: camera_config.onvif.autotracking.enabled = False self.ptz_metrics[camera]["ptz_autotracker_enabled"].value = False logger.warning( f"Disabling autotracking for {camera}: FOV relative movement not supported" ) return movestatus_supported = self.onvif.get_service_capabilities(camera) if movestatus_supported is None or movestatus_supported.lower() != "true": camera_config.onvif.autotracking.enabled = False self.ptz_metrics[camera]["ptz_autotracker_enabled"].value = False logger.warning( f"Disabling autotracking for {camera}: ONVIF MoveStatus not supported" ) return if self.onvif.cams[camera]["init"]: self.onvif.get_camera_status(camera) # movement thread per camera self.move_threads[camera] = threading.Thread( name=f"ptz_move_thread_{camera}", target=partial(self._process_move_queue, camera), ) self.move_threads[camera].daemon = True self.move_threads[camera].start() if camera_config.onvif.autotracking.movement_weights: if len(camera_config.onvif.autotracking.movement_weights) == 5: camera_config.onvif.autotracking.movement_weights = [ float(val) for val in camera_config.onvif.autotracking.movement_weights ] self.ptz_metrics[camera][ "ptz_min_zoom" ].value = camera_config.onvif.autotracking.movement_weights[0] self.ptz_metrics[camera][ "ptz_max_zoom" ].value = camera_config.onvif.autotracking.movement_weights[1] self.intercept[ camera ] = camera_config.onvif.autotracking.movement_weights[2] self.move_coefficients[ camera ] = camera_config.onvif.autotracking.movement_weights[3:] else: camera_config.onvif.autotracking.enabled = False self.ptz_metrics[camera]["ptz_autotracker_enabled"].value = False logger.warning( f"Autotracker recalibration is required for {camera}. Disabling autotracking." ) if camera_config.onvif.autotracking.calibrate_on_startup: self._calibrate_camera(camera) self.ptz_metrics[camera]["ptz_tracking_active"].clear() self.dispatcher.publish(f"{camera}/ptz_autotracker/active", "OFF", retain=False) self.autotracker_init[camera] = True def _write_config(self, camera): config_file = os.environ.get("CONFIG_FILE", f"{CONFIG_DIR}/config.yml") logger.debug( f"{camera}: Writing new config with autotracker motion coefficients: {self.config.cameras[camera].onvif.autotracking.movement_weights}" ) update_yaml_file( config_file, ["cameras", camera, "onvif", "autotracking", "movement_weights"], self.config.cameras[camera].onvif.autotracking.movement_weights, ) def _calibrate_camera(self, camera): # move the camera from the preset in steps and measure the time it takes to move that amount # this will allow us to predict movement times with a simple linear regression # start with 0 so we can determine a baseline (to be used as the intercept in the regression calc) # TODO: take zooming into account too num_steps = 30 step_sizes = np.linspace(0, 1, num_steps) zoom_in_values = [] zoom_out_values = [] self.calibrating[camera] = True logger.info(f"Camera calibration for {camera} in progress") # zoom levels test if ( self.config.cameras[camera].onvif.autotracking.zooming != ZoomingModeEnum.disabled ): logger.info(f"Calibration for {camera} in progress: 0% complete") for i in range(2): # absolute move to 0 - fully zoomed out self.onvif._zoom_absolute( camera, self.onvif.cams[camera]["absolute_zoom_range"]["XRange"]["Min"], 1, ) while not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) zoom_out_values.append(self.ptz_metrics[camera]["ptz_zoom_level"].value) self.onvif._zoom_absolute( camera, self.onvif.cams[camera]["absolute_zoom_range"]["XRange"]["Max"], 1, ) while not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) zoom_in_values.append(self.ptz_metrics[camera]["ptz_zoom_level"].value) if ( self.config.cameras[camera].onvif.autotracking.zooming == ZoomingModeEnum.relative ): # relative move to -0.01 self.onvif._move_relative( camera, 0, 0, -1e-2, 1, ) while not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) zoom_out_values.append( self.ptz_metrics[camera]["ptz_zoom_level"].value ) # relative move to 0.01 self.onvif._move_relative( camera, 0, 0, 1e-2, 1, ) while not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) zoom_in_values.append( self.ptz_metrics[camera]["ptz_zoom_level"].value ) self.ptz_metrics[camera]["ptz_max_zoom"].value = max(zoom_in_values) self.ptz_metrics[camera]["ptz_min_zoom"].value = min(zoom_out_values) logger.debug( f'{camera}: Calibration values: max zoom: {self.ptz_metrics[camera]["ptz_max_zoom"].value}, min zoom: {self.ptz_metrics[camera]["ptz_min_zoom"].value}' ) else: self.ptz_metrics[camera]["ptz_max_zoom"].value = 1 self.ptz_metrics[camera]["ptz_min_zoom"].value = 0 self.onvif._move_to_preset( camera, self.config.cameras[camera].onvif.autotracking.return_preset.lower(), ) self.ptz_metrics[camera]["ptz_reset"].set() self.ptz_metrics[camera]["ptz_motor_stopped"].clear() # Wait until the camera finishes moving while not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) for step in range(num_steps): pan = step_sizes[step] tilt = step_sizes[step] start_time = time.time() self.onvif._move_relative(camera, pan, tilt, 0, 1) # Wait until the camera finishes moving while not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) stop_time = time.time() self.move_metrics[camera].append( { "pan": pan, "tilt": tilt, "start_timestamp": start_time, "end_timestamp": stop_time, } ) self.onvif._move_to_preset( camera, self.config.cameras[camera].onvif.autotracking.return_preset.lower(), ) self.ptz_metrics[camera]["ptz_reset"].set() self.ptz_metrics[camera]["ptz_motor_stopped"].clear() # Wait until the camera finishes moving while not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) logger.info( f"Calibration for {camera} in progress: {round((step/num_steps)*100)}% complete" ) self.calibrating[camera] = False logger.info(f"Calibration for {camera} complete") # calculate and save new intercept and coefficients self._calculate_move_coefficients(camera, True) def _calculate_move_coefficients(self, camera, calibration=False): # calculate new coefficients when we have 50 more new values. Save up to 500 if calibration or ( len(self.move_metrics[camera]) % 50 == 0 and len(self.move_metrics[camera]) != 0 and len(self.move_metrics[camera]) <= AUTOTRACKING_MAX_MOVE_METRICS ): X = np.array( [abs(d["pan"]) + abs(d["tilt"]) for d in self.move_metrics[camera]] ) y = np.array( [ d["end_timestamp"] - d["start_timestamp"] for d in self.move_metrics[camera] ] ) # simple linear regression with intercept X_with_intercept = np.column_stack((np.ones(X.shape[0]), X)) self.move_coefficients[camera] = np.linalg.lstsq( X_with_intercept, y, rcond=None )[0] # only assign a new intercept if we're calibrating if calibration: self.intercept[camera] = y[0] # write the min zoom, max zoom, intercept, and coefficients # back to the config file as a comma separated string self.config.cameras[camera].onvif.autotracking.movement_weights = ", ".join( str(v) for v in [ self.ptz_metrics[camera]["ptz_min_zoom"].value, self.ptz_metrics[camera]["ptz_max_zoom"].value, self.intercept[camera], *self.move_coefficients[camera], ] ) logger.debug( f"{camera}: New regression parameters - intercept: {self.intercept[camera]}, coefficients: {self.move_coefficients[camera]}" ) self._write_config(camera) def _predict_movement_time(self, camera, pan, tilt): combined_movement = abs(pan) + abs(tilt) input_data = np.array([self.intercept[camera], combined_movement]) return np.dot(self.move_coefficients[camera], input_data) def _calculate_tracked_object_metrics(self, camera, obj): def remove_outliers(data): Q1 = np.percentile(data, 25) Q3 = np.percentile(data, 75) IQR = Q3 - Q1 lower_bound = Q1 - 1.5 * IQR upper_bound = Q3 + 1.5 * IQR filtered_data = [x for x in data if lower_bound <= x <= upper_bound] removed_values = [x for x in data if x not in filtered_data] logger.debug(f"{camera}: Removed area outliers: {removed_values}") return filtered_data camera_config = self.config.cameras[camera] camera_width = camera_config.frame_shape[1] camera_height = camera_config.frame_shape[0] # Extract areas and calculate weighted average # grab the largest dimension of the bounding box and create a square from that areas = [ max(obj["box"][2] - obj["box"][0], obj["box"][3] - obj["box"][1]) ** 2 for obj in self.tracked_object_history[camera] ] filtered_areas = ( remove_outliers(areas) if len(areas) >= self.config.cameras[camera].detect.fps / 2 else areas ) weights = np.arange(1, len(filtered_areas) + 1) weighted_area = np.average(filtered_areas, weights=weights) self.tracked_object_metrics[camera]["target_box"] = ( weighted_area / (camera_width * camera_height) ) ** self.zoom_factor[camera] if "original_target_box" not in self.tracked_object_metrics[camera]: self.tracked_object_metrics[camera][ "original_target_box" ] = self.tracked_object_metrics[camera]["target_box"] ( self.tracked_object_metrics[camera]["valid_velocity"], self.tracked_object_metrics[camera]["velocity"], ) = self._get_valid_velocity(camera, obj) self.tracked_object_metrics[camera]["distance"] = self._get_distance_threshold( camera, obj ) centroid_distance = np.linalg.norm( [ obj.obj_data["centroid"][0] - camera_config.detect.width / 2, obj.obj_data["centroid"][1] - camera_config.detect.height / 2, ] ) logger.debug(f"{camera}: Centroid distance: {centroid_distance}") self.tracked_object_metrics[camera]["below_distance_threshold"] = ( centroid_distance < self.tracked_object_metrics[camera]["distance"] ) def _process_move_queue(self, camera): camera_config = self.config.cameras[camera] camera_config.frame_shape[1] camera_config.frame_shape[0] while not self.stop_event.is_set(): move_data = self.move_queues[camera].get() with self.move_queue_locks[camera]: frame_time, pan, tilt, zoom = move_data # if we're receiving move requests during a PTZ move, ignore them if ptz_moving_at_frame_time( frame_time, self.ptz_metrics[camera]["ptz_start_time"].value, self.ptz_metrics[camera]["ptz_stop_time"].value, ): # instead of dequeueing this might be a good place to preemptively move based # on an estimate - for fast moving objects, etc. logger.debug( f"{camera}: Move queue: PTZ moving, dequeueing move request - frame time: {frame_time}, final pan: {pan}, final tilt: {tilt}, final zoom: {zoom}" ) continue else: if ( self.config.cameras[camera].onvif.autotracking.zooming == ZoomingModeEnum.relative ): self.onvif._move_relative(camera, pan, tilt, zoom, 1) else: if pan != 0 or tilt != 0: self.onvif._move_relative(camera, pan, tilt, 0, 1) # Wait until the camera finishes moving while not self.ptz_metrics[camera][ "ptz_motor_stopped" ].is_set(): self.onvif.get_camera_status(camera) if ( zoom > 0 and self.ptz_metrics[camera]["ptz_zoom_level"].value != zoom ): self.onvif._zoom_absolute(camera, zoom, 1) # Wait until the camera finishes moving while not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) if self.config.cameras[camera].onvif.autotracking.movement_weights: logger.debug( f"{camera}: Predicted movement time: {self._predict_movement_time(camera, pan, tilt)}" ) logger.debug( f'{camera}: Actual movement time: {self.ptz_metrics[camera]["ptz_stop_time"].value-self.ptz_metrics[camera]["ptz_start_time"].value}' ) # save metrics for better estimate calculations if ( self.intercept[camera] is not None and len(self.move_metrics[camera]) < AUTOTRACKING_MAX_MOVE_METRICS and (pan != 0 or tilt != 0) and self.config.cameras[ camera ].onvif.autotracking.calibrate_on_startup ): logger.debug(f"{camera}: Adding new values to move metrics") self.move_metrics[camera].append( { "pan": pan, "tilt": tilt, "start_timestamp": self.ptz_metrics[camera][ "ptz_start_time" ].value, "end_timestamp": self.ptz_metrics[camera][ "ptz_stop_time" ].value, } ) # calculate new coefficients if we have enough data self._calculate_move_coefficients(camera) def _enqueue_move(self, camera, frame_time, pan, tilt, zoom): def split_value(value): clipped = np.clip(value, -1, 1) return clipped, value - clipped if ( frame_time > self.ptz_metrics[camera]["ptz_start_time"].value and frame_time > self.ptz_metrics[camera]["ptz_stop_time"].value and not self.move_queue_locks[camera].locked() ): # don't make small movements if abs(pan) < 0.02: pan = 0 if abs(tilt) < 0.02: tilt = 0 # split up any large moves caused by velocity estimated movements while pan != 0 or tilt != 0 or zoom != 0: pan, pan_excess = split_value(pan) tilt, tilt_excess = split_value(tilt) zoom, zoom_excess = split_value(zoom) logger.debug( f"{camera}: Enqueue movement for frame time: {frame_time} pan: {pan}, tilt: {tilt}, zoom: {zoom}" ) move_data = (frame_time, pan, tilt, zoom) self.move_queues[camera].put(move_data) pan = pan_excess tilt = tilt_excess zoom = zoom_excess def _get_valid_velocity(self, camera, obj): # returns a tuple and euclidean distance if the estimated velocity is valid # if invalid, returns [0, 0] and -1 camera_config = self.config.cameras[camera] camera_width = camera_config.frame_shape[1] camera_height = camera_config.frame_shape[0] camera_fps = camera_config.detect.fps # estimate_velocity is a numpy array of bbox top,left and bottom,right velocities velocities = obj.obj_data["estimate_velocity"] logger.debug(f"{camera}: Velocities from norfair: {velocities}") # if we are close enough to zero, return right away if np.all(np.round(velocities) == 0): return True, np.zeros((4,)) # Thresholds x_mags_thresh = camera_width / camera_fps / 2 y_mags_thresh = camera_height / camera_fps / 2 dir_thresh = 0.93 delta_thresh = 20 var_thresh = 10 # Check magnitude x_mags = np.abs(velocities[:, 0]) y_mags = np.abs(velocities[:, 1]) invalid_x_mags = np.any(x_mags > x_mags_thresh) invalid_y_mags = np.any(y_mags > y_mags_thresh) # Check delta delta = np.abs(velocities[0] - velocities[1]) invalid_delta = np.any(delta > delta_thresh) # Check variance stdevs = np.std(velocities, axis=0) high_variances = np.any(stdevs > var_thresh) # Check direction difference velocities = np.round(velocities) invalid_dirs = False if not np.any(np.linalg.norm(velocities, axis=1)): cosine_sim = np.dot(velocities[0], velocities[1]) / ( np.linalg.norm(velocities[0]) * np.linalg.norm(velocities[1]) ) dir_thresh = 0.6 if np.all(delta < delta_thresh / 2) else dir_thresh invalid_dirs = cosine_sim < dir_thresh # Combine invalid = ( invalid_x_mags or invalid_y_mags or invalid_dirs or invalid_delta or high_variances ) if invalid: logger.debug( f"{camera}: Invalid velocity: {tuple(np.round(velocities, 2).flatten().astype(int))}: Invalid because: " + ", ".join( [ var_name for var_name, is_invalid in [ ("invalid_x_mags", invalid_x_mags), ("invalid_y_mags", invalid_y_mags), ("invalid_dirs", invalid_dirs), ("invalid_delta", invalid_delta), ("high_variances", high_variances), ] if is_invalid ] ) ) # invalid velocity return False, np.zeros((4,)) else: logger.debug(f"{camera}: Valid velocity ") return True, velocities.flatten() def _get_distance_threshold(self, camera, obj): # Returns true if Euclidean distance from object to center of frame is # less than 10% of the of the larger dimension (width or height) of the frame, # multiplied by a scaling factor for object size. # Distance is increased if object is not moving to prevent small ptz moves # Adjusting this percentage slightly lower will effectively cause the camera to move # more often to keep the object in the center. Raising the percentage will cause less # movement and will be more flexible with objects not quite being centered. # TODO: there's probably a better way to approach this camera_config = self.config.cameras[camera] obj_width = obj.obj_data["box"][2] - obj.obj_data["box"][0] obj_height = obj.obj_data["box"][3] - obj.obj_data["box"][1] max_obj = max(obj_width, obj_height) max_frame = ( camera_config.detect.width if max_obj == obj_width else camera_config.detect.height ) # larger objects should lower the threshold, smaller objects should raise it scaling_factor = 1 - np.log(max_obj / max_frame) percentage = ( 0.08 if camera_config.onvif.autotracking.movement_weights and self.tracked_object_metrics[camera]["valid_velocity"] else 0.03 ) distance_threshold = percentage * max_frame * scaling_factor logger.debug(f"{camera}: Distance threshold: {distance_threshold}") return distance_threshold def _should_zoom_in(self, camera, obj, box, debug_zooming=False): # returns True if we should zoom in, False if we should zoom out, None to do nothing camera_config = self.config.cameras[camera] camera_width = camera_config.frame_shape[1] camera_height = camera_config.frame_shape[0] camera_fps = camera_config.detect.fps average_velocity = self.tracked_object_metrics[camera]["velocity"] bb_left, bb_top, bb_right, bb_bottom = box # TODO: Take into account the area changing when an object is moving out of frame edge_threshold = AUTOTRACKING_ZOOM_EDGE_THRESHOLD # calculate a velocity threshold based on movement coefficients if available if camera_config.onvif.autotracking.movement_weights: predicted_movement_time = self._predict_movement_time(camera, 1, 1) velocity_threshold_x = camera_width / predicted_movement_time / camera_fps velocity_threshold_y = camera_height / predicted_movement_time / camera_fps else: # use a generic velocity threshold velocity_threshold_x = camera_width * 0.02 velocity_threshold_y = camera_height * 0.02 touching_frame_edges = int( (bb_left < edge_threshold * camera_width) + (bb_right > (1 - edge_threshold) * camera_width) + (bb_top < edge_threshold * camera_height) + (bb_bottom > (1 - edge_threshold) * camera_height) ) # make sure object is centered in the frame below_distance_threshold = self.tracked_object_metrics[camera][ "below_distance_threshold" ] below_dimension_threshold = (bb_right - bb_left) <= camera_width * ( self.zoom_factor[camera] + 0.1 ) and (bb_bottom - bb_top) <= camera_height * (self.zoom_factor[camera] + 0.1) # ensure object is not moving quickly below_velocity_threshold = np.all( np.abs(average_velocity) < np.tile([velocity_threshold_x, velocity_threshold_y], 2) ) or np.all(average_velocity == 0) below_area_threshold = ( self.tracked_object_metrics[camera]["target_box"] < self.tracked_object_metrics[camera]["max_target_box"] ) # introduce some hysteresis to prevent a yo-yo zooming effect zoom_out_hysteresis = ( self.tracked_object_metrics[camera]["target_box"] > self.tracked_object_metrics[camera]["max_target_box"] * AUTOTRACKING_ZOOM_OUT_HYSTERESIS ) zoom_in_hysteresis = ( self.tracked_object_metrics[camera]["target_box"] < self.tracked_object_metrics[camera]["max_target_box"] * AUTOTRACKING_ZOOM_IN_HYSTERESIS ) at_max_zoom = ( self.ptz_metrics[camera]["ptz_zoom_level"].value == self.ptz_metrics[camera]["ptz_max_zoom"].value ) at_min_zoom = ( self.ptz_metrics[camera]["ptz_zoom_level"].value == self.ptz_metrics[camera]["ptz_min_zoom"].value ) # debug zooming if debug_zooming: logger.debug( f"{camera}: Zoom test: touching edges: count: {touching_frame_edges} left: {bb_left < edge_threshold * camera_width}, right: {bb_right > (1 - edge_threshold) * camera_width}, top: {bb_top < edge_threshold * camera_height}, bottom: {bb_bottom > (1 - edge_threshold) * camera_height}" ) logger.debug( f"{camera}: Zoom test: below distance threshold: {(below_distance_threshold)}" ) logger.debug( f"{camera}: Zoom test: below area threshold: {(below_area_threshold)} target: {self.tracked_object_metrics[camera]['target_box']} max: {self.tracked_object_metrics[camera]['max_target_box']}" ) logger.debug( f"{camera}: Zoom test: below dimension threshold: {below_dimension_threshold} width: {bb_right - bb_left}, max width: {camera_width * (self.zoom_factor[camera] + 0.1)}, height: {bb_bottom - bb_top}, max height: {camera_height * (self.zoom_factor[camera] + 0.1)}" ) logger.debug( f"{camera}: Zoom test: below velocity threshold: {below_velocity_threshold} velocity x: {abs(average_velocity[0])}, x threshold: {velocity_threshold_x}, velocity y: {abs(average_velocity[0])}, y threshold: {velocity_threshold_y}" ) logger.debug(f"{camera}: Zoom test: at max zoom: {at_max_zoom}") logger.debug(f"{camera}: Zoom test: at min zoom: {at_min_zoom}") logger.debug( f'{camera}: Zoom test: zoom in hysteresis limit: {zoom_in_hysteresis} value: {AUTOTRACKING_ZOOM_IN_HYSTERESIS} original: {self.tracked_object_metrics[camera]["original_target_box"]} max: {self.tracked_object_metrics[camera]["max_target_box"]} target: {self.tracked_object_metrics[camera]["target_box"]}' ) logger.debug( f'{camera}: Zoom test: zoom out hysteresis limit: {zoom_out_hysteresis} value: {AUTOTRACKING_ZOOM_OUT_HYSTERESIS} original: {self.tracked_object_metrics[camera]["original_target_box"]} max: {self.tracked_object_metrics[camera]["max_target_box"]} target: {self.tracked_object_metrics[camera]["target_box"]}' ) # Zoom in conditions (and) if ( zoom_in_hysteresis and touching_frame_edges == 0 and below_velocity_threshold and below_dimension_threshold and below_area_threshold and not at_max_zoom ): return True # Zoom out conditions (or) if ( ( zoom_out_hysteresis and not at_max_zoom and (not below_area_threshold or not below_dimension_threshold) ) or (zoom_out_hysteresis and not below_area_threshold and at_max_zoom) or ( touching_frame_edges == 1 and (below_distance_threshold or not below_dimension_threshold) ) or touching_frame_edges > 1 or not below_velocity_threshold ) and not at_min_zoom: return False # Don't zoom at all return None def _autotrack_move_ptz(self, camera, obj): camera_config = self.config.cameras[camera] camera_width = camera_config.frame_shape[1] camera_height = camera_config.frame_shape[0] camera_fps = camera_config.detect.fps average_velocity = np.zeros((4,)) predicted_box = obj.obj_data["box"] centroid_x = obj.obj_data["centroid"][0] centroid_y = obj.obj_data["centroid"][1] # Normalize coordinates. top right of the fov is (1,1), center is (0,0), bottom left is (-1, -1). pan = ((centroid_x / camera_width) - 0.5) * 2 tilt = (0.5 - (centroid_y / camera_height)) * 2 if ( camera_config.onvif.autotracking.movement_weights ): # use estimates if we have available coefficients predicted_movement_time = self._predict_movement_time(camera, pan, tilt) _, average_velocity = ( self._get_valid_velocity(camera, obj) if "velocity" not in self.tracked_object_metrics[camera] else ( self.tracked_object_metrics[camera]["valid_velocity"], self.tracked_object_metrics[camera]["velocity"], ) ) if np.any(average_velocity): # this box could exceed the frame boundaries if velocity is high # but we'll handle that in _enqueue_move() as two separate moves current_box = np.array(obj.obj_data["box"]) predicted_box = ( current_box + camera_fps * predicted_movement_time * average_velocity ) predicted_box = np.round(predicted_box).astype(int) centroid_x = round((predicted_box[0] + predicted_box[2]) / 2) centroid_y = round((predicted_box[1] + predicted_box[3]) / 2) # recalculate pan and tilt with new centroid pan = ((centroid_x / camera_width) - 0.5) * 2 tilt = (0.5 - (centroid_y / camera_height)) * 2 logger.debug(f'{camera}: Original box: {obj.obj_data["box"]}') logger.debug(f"{camera}: Predicted box: {tuple(predicted_box)}") logger.debug( f"{camera}: Velocity: {tuple(np.round(average_velocity).flatten().astype(int))}" ) zoom = self._get_zoom_amount(camera, obj, predicted_box, debug_zoom=True) self._enqueue_move(camera, obj.obj_data["frame_time"], pan, tilt, zoom) def _autotrack_move_zoom_only(self, camera, obj): camera_config = self.config.cameras[camera] if camera_config.onvif.autotracking.zooming != ZoomingModeEnum.disabled: zoom = self._get_zoom_amount(camera, obj, obj.obj_data["box"]) if zoom != 0: self._enqueue_move(camera, obj.obj_data["frame_time"], 0, 0, zoom) def _get_zoom_amount(self, camera, obj, predicted_box, debug_zoom=True): camera_config = self.config.cameras[camera] # frame width and height camera_width = camera_config.frame_shape[1] camera_height = camera_config.frame_shape[0] zoom = 0 result = None current_zoom_level = self.ptz_metrics[camera]["ptz_zoom_level"].value target_box = max( obj.obj_data["box"][2] - obj.obj_data["box"][0], obj.obj_data["box"][3] - obj.obj_data["box"][1], ) ** 2 / (camera_width * camera_height) # absolute zooming separately from pan/tilt if camera_config.onvif.autotracking.zooming == ZoomingModeEnum.absolute: # don't zoom on initial move if "target_box" not in self.tracked_object_metrics[camera]: zoom = current_zoom_level else: if ( result := self._should_zoom_in( camera, obj, obj.obj_data["box"], debug_zoom ) ) is not None: # divide zoom in 10 increments and always zoom out more than in level = ( self.ptz_metrics[camera]["ptz_max_zoom"].value - self.ptz_metrics[camera]["ptz_min_zoom"].value ) / 20 if result: zoom = min(1.0, current_zoom_level + level) else: zoom = max(0.0, current_zoom_level - 2 * level) # relative zooming concurrently with pan/tilt if camera_config.onvif.autotracking.zooming == ZoomingModeEnum.relative: # this is our initial zoom in on a new object if "target_box" not in self.tracked_object_metrics[camera]: zoom = target_box ** self.zoom_factor[camera] if zoom > self.tracked_object_metrics[camera]["max_target_box"]: zoom = -(1 - zoom) logger.debug( f"{camera}: target box: {target_box}, max: {self.tracked_object_metrics[camera]['max_target_box']}, calc zoom: {zoom}" ) else: if ( result := self._should_zoom_in( camera, obj, predicted_box if camera_config.onvif.autotracking.movement_weights else obj.obj_data["box"], debug_zoom, ) ) is not None: # zoom value ratio = ( self.tracked_object_metrics[camera]["max_target_box"] / self.tracked_object_metrics[camera]["target_box"] ) zoom = (ratio - 1) / (ratio + 1) logger.debug( f'{camera}: limit: {self.tracked_object_metrics[camera]["max_target_box"]}, ratio: {ratio} zoom calculation: {zoom}' ) if not result: # zoom out with special condition if zooming out because of velocity, edges, etc. zoom = -(1 - zoom) if zoom > 0 else -(zoom * 2 + 1) if result: # zoom in zoom = 1 - zoom if zoom > 0 else (zoom * 2 + 1) logger.debug(f"{camera}: Zooming: {result} Zoom amount: {zoom}") return zoom def is_autotracking(self, camera): return self.tracked_object[camera] is not None def autotracked_object_region(self, camera): return self.tracked_object[camera]["region"] def autotrack_object(self, camera, obj): camera_config = self.config.cameras[camera] if camera_config.onvif.autotracking.enabled: if not self.autotracker_init[camera]: self._autotracker_setup(camera_config, camera) if self.calibrating[camera]: logger.debug(f"{camera}: Calibrating camera") return # this is a brand new object that's on our camera, has our label, entered the zone, # is not a false positive, and is not initially motionless if ( # new object self.tracked_object[camera] is None and obj.camera == camera and obj.obj_data["label"] in self.object_types[camera] and set(obj.entered_zones) & set(self.required_zones[camera]) and not obj.previous["false_positive"] and not obj.false_positive and not self.tracked_object_history[camera] and obj.obj_data["motionless_count"] == 0 ): logger.debug( f"{camera}: New object: {obj.obj_data['id']} {obj.obj_data['box']} {obj.obj_data['frame_time']}" ) self.ptz_metrics[camera]["ptz_tracking_active"].set() self.dispatcher.publish( f"{camera}/ptz_autotracker/active", "ON", retain=False ) self.tracked_object[camera] = obj self.tracked_object_history[camera].append(copy.deepcopy(obj.obj_data)) self._autotrack_move_ptz(camera, obj) return if ( # already tracking an object self.tracked_object[camera] is not None and self.tracked_object_history[camera] and obj.obj_data["id"] == self.tracked_object[camera].obj_data["id"] and obj.obj_data["frame_time"] != self.tracked_object_history[camera][-1]["frame_time"] and not ptz_moving_at_frame_time( obj.obj_data["frame_time"], self.ptz_metrics[camera]["ptz_start_time"].value, self.ptz_metrics[camera]["ptz_stop_time"].value, ) ): self.tracked_object_history[camera].append(copy.deepcopy(obj.obj_data)) self._calculate_tracked_object_metrics(camera, obj) if self.tracked_object_metrics[camera]["below_distance_threshold"]: logger.debug( f"{camera}: Existing object (do NOT move ptz): {obj.obj_data['id']} {obj.obj_data['box']} {obj.obj_data['frame_time']}" ) # no need to move, but try zooming self._autotrack_move_zoom_only(camera, obj) else: logger.debug( f"{camera}: Existing object (need to move ptz): {obj.obj_data['id']} {obj.obj_data['box']} {obj.obj_data['frame_time']}" ) self._autotrack_move_ptz(camera, obj) return if ( # The tracker lost an object, so let's check the previous object's region and compare it with the incoming object # If it's within bounds, start tracking that object. # Should we check region (maybe too broad) or expand the previous object's box a bit and check that? self.tracked_object[camera] is None and obj.camera == camera and obj.obj_data["label"] in self.object_types[camera] and not obj.previous["false_positive"] and not obj.false_positive and self.tracked_object_history[camera] ): if ( intersection_over_union( self.tracked_object_history[camera][-1]["region"], obj.obj_data["box"], ) < 0.2 ): logger.debug( f"{camera}: Reacquired object: {obj.obj_data['id']} {obj.obj_data['box']} {obj.obj_data['frame_time']}" ) self.tracked_object[camera] = obj self.tracked_object_history[camera].clear() self.tracked_object_history[camera].append( copy.deepcopy(obj.obj_data) ) self._calculate_tracked_object_metrics(camera, obj) self._autotrack_move_ptz(camera, obj) return def end_object(self, camera, obj): if self.config.cameras[camera].onvif.autotracking.enabled: if ( self.tracked_object[camera] is not None and obj.obj_data["id"] == self.tracked_object[camera].obj_data["id"] ): logger.debug( f"{camera}: End object: {obj.obj_data['id']} {obj.obj_data['box']}" ) self.tracked_object[camera] = None self.tracked_object_metrics[camera] = { "max_target_box": AUTOTRACKING_MAX_AREA_RATIO ** (1 / self.zoom_factor[camera]) } def camera_maintenance(self, camera): # bail and don't check anything if we're calibrating or tracking an object if ( not self.autotracker_init[camera] or self.calibrating[camera] or self.tracked_object[camera] is not None ): return # calls get_camera_status to check/update ptz movement # returns camera to preset after timeout when tracking is over autotracker_config = self.config.cameras[camera].onvif.autotracking if not self.autotracker_init[camera]: self._autotracker_setup(self.config.cameras[camera], camera) # regularly update camera status if not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) # return to preset if tracking is over if ( self.tracked_object[camera] is None and self.tracked_object_history[camera] and ( # might want to use a different timestamp here? self.ptz_metrics[camera]["ptz_frame_time"].value - self.tracked_object_history[camera][-1]["frame_time"] >= autotracker_config.timeout ) and autotracker_config.return_preset ): # clear tracked object and reset zoom level self.tracked_object[camera] = None self.tracked_object_history[camera].clear() # empty move queue while not self.move_queues[camera].empty(): self.move_queues[camera].get() self.ptz_metrics[camera]["ptz_motor_stopped"].wait() logger.debug( f"{camera}: Time is {self.ptz_metrics[camera]['ptz_frame_time'].value}, returning to preset: {autotracker_config.return_preset}" ) self.onvif._move_to_preset( camera, autotracker_config.return_preset.lower(), ) # update stored zoom level from preset if not self.ptz_metrics[camera]["ptz_motor_stopped"].is_set(): self.onvif.get_camera_status(camera) self.ptz_metrics[camera]["ptz_tracking_active"].clear() self.dispatcher.publish( f"{camera}/ptz_autotracker/active", "OFF", retain=False ) self.ptz_metrics[camera]["ptz_reset"].set()