mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
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56 lines
2.1 KiB
56 lines
2.1 KiB
14 years ago
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import numpy as np
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import cv2, cv
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import video
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from common import nothing, clock, draw_str
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MHI_DURATION = 1.0
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DEFAULT_THRESHOLD = 16
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MAX_TIME_DELTA = 0.5
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MIN_TIME_DELTA = 0.05
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if __name__ == '__main__':
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import sys
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try: video_src = sys.argv[1]
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except: video_src = 'synth:class=chess:bg=../cpp/lena.jpg:noise=0.01'
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cv2.namedWindow('motempl')
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visuals = ['input', 'frame_diff', 'motion_hist', 'grad_orient']
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cv2.createTrackbar('visual', 'motempl', 2, len(visuals)-1, nothing)
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cv2.createTrackbar('threshold', 'motempl', DEFAULT_THRESHOLD, 255, nothing)
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cam = video.create_capture(video_src)
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ret, frame = cam.read()
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h, w = frame.shape[:2]
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prev_frame = frame.copy()
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motion_history = np.zeros((h, w), np.float32)
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hsv = np.zeros((h, w, 3), np.uint8)
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hsv[:,:,1] = 255
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while True:
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ret, frame = cam.read()
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frame_diff = cv2.absdiff(frame, prev_frame)
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gray_diff = cv2.cvtColor(frame_diff, cv.CV_BGR2GRAY)
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thrs = cv2.getTrackbarPos('threshold', 'motempl')
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ret, motion_mask = cv2.threshold(gray_diff, thrs, 255, cv2.THRESH_BINARY)
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timestamp = clock()
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cv2.updateMotionHistory(motion_mask, motion_history, timestamp, MHI_DURATION)
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mg_mask, mg_orient = cv2.calcMotionGradient( motion_history, MAX_TIME_DELTA, MIN_TIME_DELTA, apertureSize=5 );
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visual_name = visuals[cv2.getTrackbarPos('visual', 'motempl')]
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if visual_name == 'input':
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vis = frame.copy()
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elif visual_name == 'frame_diff':
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vis = frame_diff.copy()
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elif visual_name == 'motion_hist':
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vis = np.uint8(np.clip((motion_history-(timestamp-MHI_DURATION)) / MHI_DURATION, 0, 1)*255)
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vis = cv2.cvtColor(vis, cv.CV_GRAY2BGR)
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elif visual_name == 'grad_orient':
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hsv[:,:,0] = mg_orient/2
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hsv[:,:,2] = mg_mask*255
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vis = cv2.cvtColor(hsv, cv.CV_HSV2BGR)
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draw_str(vis, (20, 20), visual_name)
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cv2.imshow('motempl', vis)
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prev_frame = frame.copy()
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if cv2.waitKey(5) == 27:
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break
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