March 2018
Beginner to intermediate
306 pages
9h 54m
English
Content preview from OpenCV 3 Computer Vision with Python Cookbook
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Working with UI elements, such as buttons and trackbars, in an OpenCV window
In this recipe, we will learn how to add UI elements, such as buttons and trackbars, into OpenCV windows and work with them. Trackbars are useful UI elements that:
- Show the value of an integer variable, assuming the value is within a predefined range
- Allow us to change the value interactively through changing the trackbar position
Let's create a program that allows users to specify the fill color for an image by interactively changing each Red, Green, Blue (RGB) channel value.