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add support for polygon masks

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This commit is contained in:
Blake Blackshear 2020-09-13 08:23:41 -05:00
parent 69406343ee
commit 1ce993051e
2 changed files with 10 additions and 3 deletions
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7
config/config.example.yml
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@ -140,9 +140,10 @@ cameras:
# fps: 5 # fps: 5
################ ################
## Optional mask. Must be the same aspect ratio as your video feed. Value is either the ## Optional mask. Must be the same aspect ratio as your video feed. Value is any of the following:
## name of a file in the config directory or a base64 encoded bmp image prefixed with ## - name of a file in the config directory
## 'base64,' eg. 'base64,asfasdfasdf....'. ## - base64 encoded image prefixed with 'base64,' eg. 'base64,asfasdfasdf....'
## - polygon of x,y coordinates prefixed with 'poly,' eg. 'poly,0,900,1080,900,1080,1920,0,1920'
## ##
## The mask works by looking at the bottom center of the bounding box for the detected ## The mask works by looking at the bottom center of the bounding box for the detected
## person in the image. If that pixel in the mask is a black pixel, it ignores it as a ## person in the image. If that pixel in the mask is a black pixel, it ignores it as a

6
frigate/video.py
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@ -202,6 +202,12 @@ def track_camera(name, config, frame_queue, frame_shape, detection_queue, detect
img = base64.b64decode(config['mask'][7:]) img = base64.b64decode(config['mask'][7:])
npimg = np.fromstring(img, dtype=np.uint8) npimg = np.fromstring(img, dtype=np.uint8)
mask = cv2.imdecode(npimg, cv2.IMREAD_GRAYSCALE) mask = cv2.imdecode(npimg, cv2.IMREAD_GRAYSCALE)
elif config['mask'].startswith('poly,'):
points = config['mask'].split(',')[1:]
contour = np.array([[int(points[i]), int(points[i+1])] for i in range(0, len(points), 2)])
mask = np.zeros((frame_shape[0], frame_shape[1]), np.uint8)
mask[:] = 255
cv2.fillPoly(mask, pts=[contour], color=(0))
else: else:
mask = cv2.imread("/config/{}".format(config['mask']), cv2.IMREAD_GRAYSCALE) mask = cv2.imread("/config/{}".format(config['mask']), cv2.IMREAD_GRAYSCALE)
else: else: