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https://gitcode.com/gh_mirrors/es/esp32-opencv.git
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74 lines
1.6 KiB
Python
Executable File
74 lines
1.6 KiB
Python
Executable File
#!/usr/bin/env python
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'''
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Video histogram sample to show live histogram of video
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Keys:
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ESC - exit
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'''
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# Python 2/3 compatibility
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from __future__ import print_function
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import numpy as np
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import cv2 as cv
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# built-in modules
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import sys
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# local modules
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import video
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class App():
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def set_scale(self, val):
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self.hist_scale = val
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def run(self):
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hsv_map = np.zeros((180, 256, 3), np.uint8)
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h, s = np.indices(hsv_map.shape[:2])
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hsv_map[:,:,0] = h
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hsv_map[:,:,1] = s
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hsv_map[:,:,2] = 255
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hsv_map = cv.cvtColor(hsv_map, cv.COLOR_HSV2BGR)
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cv.imshow('hsv_map', hsv_map)
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cv.namedWindow('hist', 0)
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self.hist_scale = 10
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cv.createTrackbar('scale', 'hist', self.hist_scale, 32, self.set_scale)
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try:
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fn = sys.argv[1]
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except:
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fn = 0
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cam = video.create_capture(fn, fallback='synth:bg=baboon.jpg:class=chess:noise=0.05')
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while True:
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_flag, frame = cam.read()
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cv.imshow('camera', frame)
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small = cv.pyrDown(frame)
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hsv = cv.cvtColor(small, cv.COLOR_BGR2HSV)
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dark = hsv[...,2] < 32
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hsv[dark] = 0
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h = cv.calcHist([hsv], [0, 1], None, [180, 256], [0, 180, 0, 256])
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h = np.clip(h*0.005*self.hist_scale, 0, 1)
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vis = hsv_map*h[:,:,np.newaxis] / 255.0
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cv.imshow('hist', vis)
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ch = cv.waitKey(1)
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if ch == 27:
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break
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print('Done')
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if __name__ == '__main__':
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print(__doc__)
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App().run()
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cv.destroyAllWindows()
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