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#!/usr/bin/env python
'''
Video histogram sample to show live histogram of video
Keys:
ESC - exit
'''
import numpy as np
import cv2
# built-in modules
import sys
# local modules
import video
if __name__ == '__main__':
hsv_map = np.zeros((180, 256, 3), np.uint8)
h, s = np.indices(hsv_map.shape[:2])
hsv_map[:,:,0] = h
hsv_map[:,:,1] = s
hsv_map[:,:,2] = 255
hsv_map = cv2.cvtColor(hsv_map, cv2.COLOR_HSV2BGR)
cv2.imshow('hsv_map', hsv_map)
cv2.namedWindow('hist', 0)
hist_scale = 10
def set_scale(val):
global hist_scale
hist_scale = val
cv2.createTrackbar('scale', 'hist', hist_scale, 32, set_scale)
try:
fn = sys.argv[1]
except:
fn = 0
cam = video.create_capture(fn, fallback='synth:bg=../data/baboon.jpg:class=chess:noise=0.05')
while True:
flag, frame = cam.read()
cv2.imshow('camera', frame)
small = cv2.pyrDown(frame)
hsv = cv2.cvtColor(small, cv2.COLOR_BGR2HSV)
dark = hsv[...,2] < 32
hsv[dark] = 0
h = cv2.calcHist([hsv], [0, 1], None, [180, 256], [0, 180, 0, 256])
h = np.clip(h*0.005*hist_scale, 0, 1)
vis = hsv_map*h[:,:,np.newaxis] / 255.0
cv2.imshow('hist', vis)
ch = cv2.waitKey(1)
if ch == 27:
break
cv2.destroyAllWindows()
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