Introduction
Sometimes, we need to transform color images to monochrome image. There is one way that it is very simple to help you to do. You can download source code and binary files. Even I refer to OpenCV book, but I think it is so easy. I decide to implement it by myself.
Background
Equipment Operation System: Microsoft Windows 7 Professional (64 bit) Development Utility: Microsoft Visual Studio 2010.
Using the Code
for ( int iY = 0; iY < imageA->DibInfo->bmiHeader.biHeight; iY++ )
{
for ( int iX = 0; iX < imageA->DibInfo->bmiHeader.biWidth; iX++ )
{
lIDXA = ( iX * 3 ) + ( iY * imageA->DibInfo->bmiHeader.biWidth * 3 );
byteRGB_BA = imageA->DibArry[lIDXA+0];
byteRGB_GA = imageA->DibArry[lIDXA+1];
byteRGB_RA = imageA->DibArry[lIDXA+2];
dobYUV_YA = (0.299 * byteRGB_RA + 0.587 * byteRGB_GA + 0.114 * byteRGB_BA);
if ( dobYUV_YA > 60 && dobYUV_YA < 160 )
{
lIDXB = ( iX * 3 ) + ( iY * imageB->DibInfo->bmiHeader.biWidth * 3 );
imageB->DibArry[lIDXB+0] = 255;
imageB->DibArry[lIDXB+1] = 255;
imageB->DibArry[lIDXB+2] = 255;
}
else
{
lIDXB = ( iX * 3 ) + ( iY * imageB->DibInfo->bmiHeader.biWidth * 3 );
imageB->DibArry[lIDXB+0] = 0;
imageB->DibArry[lIDXB+1] = 0;
imageB->DibArry[lIDXB+2] = 0;
}
} }
Exception
- There is a notice, if your bit depth of bitmap file is not 24 bits, you should change your bitmap files to adapt this program, or you could rewrite this source code to fit your bitmap format.
- You have to install Microsoft SDK v7.1, because I include windowscodes.lib.
#pragma comment(lib, "windowscodecs.lib")
Reference
- [1] Gary Bradski and Adrian Kaehler, “Learning OpenCV: Computer Vision with the OpenCV Library,” O’REILLY, September 2008, ISBN:978-0-596-51613-0
Acknowledgement
Thank you (Microsoft Visual Studio 2010, Lenna Sjööblom) very much for this great development utility and beautiful photo.
Dr. Lai Tai-Yu received the Ph.D. from National Taipei University of Technology in 2016. He is the co-author of 2 journal, 25 conference papers, 6 books, 9 articles in the codeproject.com, and 2 patents inventions. His research interests lie in the areas of digital image processing and AI. He is a lecturer.
Dr Taiyu Lai. Stopień doktora, uzyskał w 2016 roku i objął stanowisko adiunkta na Wydziale. Ponadto jest autorem i współautorem: 2 publikacji artykułu w czasopiśmie naukowym, 25 artykułów opublikowanych w materiałach konferencyjnych, 6 książek, 9 eseje w monografiach codeproject.com, i posiada dwa patenty. Zainteresowania naukowe: przetwarzania obrazów i AI. Jest wykładowcą.
赖岱佑在2016年取得台北科技大学资讯工程博士学位,有2篇期刊、25篇会议论文、6本书籍、9篇文章在 codeproject.com 、2项专利。研究方向:数字图像处理和AI。现职是一位讲师。
賴岱佑在2016年取得台北科技大學資訊工程博士學位,有2篇期刊、25篇會議論文、6本書籍、9篇文章在 codeproject.com 、2項專利。研究方向:數位影像處理和AI。現職是一位講師。