CyberK's profile - activity

The conventional way to transfer a RGB image to gray is

Gray = 0.299R + 0.587G + 0.114*B,

which has 3 coefficients to control the final result.

However, I tried the 'black-and-white' filter in Ps and found out it has 6 separate controls. I set red and green channel to 0 but the gray result of yellow, the combination of red and green, remained the same. Therefore I infer this filter is not working in RGB channels. It should be working in HSV, where you can adjust the luminance of one color without affecting the others.

You can set the path in IDE. Read the section 'The local method' in this article.

http://docs.opencv.org/doc/tutorials/introduction/windows_visual_studio_Opencv/windows_visual_studio_Opencv.html#windows-visual-studio-how-to

Thank you! Problem solved!

I turned on WITH_OPENGL using CMake, and rebuild the project. imshow() reports runtime error. How can I fix this problem??

int main(int argc, const char * argv[]) { cv::Mat I = cv::imread("D:/PyramidPattern.jpg"); cv::imshow("test",I); return 0; }

runtime error： OpenCV Error: OpenGL API call (Can't load OpenGL extension [glGenerateMipmap]) i n unknown function, file C:\OpenCV\modules\core\src\gl_core_3_1.cpp, line 141