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- from __future__ import print_function
- from __future__ import division
- import cv2 as cv
- import argparse
- alpha_slider_max = 100
- title_window = 'Linear Blend'
- ## [on_trackbar]
- def on_trackbar(val):
- alpha = val / alpha_slider_max
- beta = ( 1.0 - alpha )
- dst = cv.addWeighted(src1, alpha, src2, beta, 0.0)
- cv.imshow(title_window, dst)
- ## [on_trackbar]
- parser = argparse.ArgumentParser(description='Code for Adding a Trackbar to our applications tutorial.')
- parser.add_argument('--input1', help='Path to the first input image.', default='LinuxLogo.jpg')
- parser.add_argument('--input2', help='Path to the second input image.', default='WindowsLogo.jpg')
- args = parser.parse_args()
- ## [load]
- # Read images ( both have to be of the same size and type )
- src1 = cv.imread(cv.samples.findFile(args.input1))
- src2 = cv.imread(cv.samples.findFile(args.input2))
- ## [load]
- if src1 is None:
- print('Could not open or find the image: ', args.input1)
- exit(0)
- if src2 is None:
- print('Could not open or find the image: ', args.input2)
- exit(0)
- ## [window]
- cv.namedWindow(title_window)
- ## [window]
- ## [create_trackbar]
- trackbar_name = 'Alpha x %d' % alpha_slider_max
- cv.createTrackbar(trackbar_name, title_window , 0, alpha_slider_max, on_trackbar)
- ## [create_trackbar]
- # Show some stuff
- on_trackbar(0)
- # Wait until user press some key
- cv.waitKey()
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