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create shared value for motion detection

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blakeblackshear 2019-02-09 07:32:49 -06:00
parent 6e8409d203
commit d8f27658f8
1 changed files with 14 additions and 5 deletions
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17
detect_objects.py
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@ -121,11 +121,13 @@ def main():
for region in regions:
shared_memory_objects.append({
# create shared value for storing the time the frame was captured
'frame_time': mp.Value('d', 0.0),
# shared value for motion detection signal (1 for motion 0 for no motion)
'motion_detected': mp.Value('i', 1),
# create shared array for storing 10 detected objects
# note: this must be a double even though the value you are storing
# is a float. otherwise it stops updating the value in shared
# memory. probably something to do with the size of the memory block
'frame_time': mp.Value('d', 0.0),
# create shared array for storing 10 detected objects
'output_array': mp.Array(ctypes.c_double, 6*10)
})
@ -143,7 +145,9 @@ def main():
for index, region in enumerate(regions):
detection_process = mp.Process(target=process_frames, args=(shared_arr,
shared_memory_objects[index]['output_array'],
shared_memory_objects[index]['frame_time'], frame_shape,
shared_memory_objects[index]['frame_time'],
shared_memory_objects[index]['motion_detected'],
frame_shape,
region['size'], region['x_offset'], region['y_offset']))
detection_process.daemon = True
detection_processes.append(detection_process)
@ -243,7 +247,7 @@ def fetch_frames(shared_arr, shared_frame_times, frame_shape):
video.release()
# do the actual object detection
def process_frames(shared_arr, shared_output_arr, shared_frame_time, frame_shape, region_size, region_x_offset, region_y_offset):
def process_frames(shared_arr, shared_output_arr, shared_frame_time, shared_motion, frame_shape, region_size, region_x_offset, region_y_offset):
# shape shared input array into frame for processing
arr = tonumpyarray(shared_arr).reshape(frame_shape)
@ -259,6 +263,11 @@ def process_frames(shared_arr, shared_output_arr, shared_frame_time, frame_shape
no_frames_available = -1
while True:
# if there is no motion detected
if shared_motion.value == 0:
time.sleep(0.01)
continue
# if there isnt a frame ready for processing
if shared_frame_time.value == 0.0:
# save the first time there were no frames available