Shulou(Shulou.com)06/03 Report--

This article will explain in detail how to realize the binarization of 24-bit color images in C language. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

The details are as follows

/ / huiduhua.cpp: defines the entry point for the console application. / / # include "stdafx.h" # include#include int _ tmain (int argc, _ TCHAR* argv []) {BITMAPFILEHEADER bfhead; BITMAPINFOHEADER bihead; RGBQUAD * pColorTable; unsigned char * pBmpBuf; FILE * fp1=fopen ("mouse", "rb"); if (fp1==0) return 0; fread (& bfhead,14,1,fp1); / / read the file header into memory fread (& bihead,40,1,fp1); / / read the information header into memory int LineByte= (bihead.biWidth*24/8+3) / 4x4 / / ensure that the number of bytes per row is an integral multiple of 4 pBmpBuf=new unsigned char [LineByte*bihead.biHeight]; / / allocate memory space fread (pBmpBuf,LineByte*bihead.biHeight,1,fp1) for the data area; / / read the bmp data area into memory fclose (fp1); printf ("Width:%d, Height:% d\ n", bihead.biWidth,bihead.biHeight,bihead.biBitCount) / / now the true color image will be grayed out int LineByte1= (bihead.biWidth*8/8+3) / 4 colors 4; / / since the number of bits per pixel is changed to 8 after graying, the number of bytes per line will be changed, but it is still required to be an integral multiple of 4 FILE * fp2=fopen ("mouse 2.bmp", "wb"); if (fp2==0) return 0; / / change the file header and save it bfhead.bfSize=14+40+sizeof (RGBQUAD) * 256+LineByte1*bihead.biHeight / / change the file size bfhead.bfOffBits=14+40+sizeof (RGBQUAD) * 256; / / change the offset value fwrite (& bfhead,14,1,fp2); / / change the header and save it bihead.biBitCount=8; / / change the number of bits per pixel bihead.biSizeImage=LineByte1*bihead.biHeight; / / change the data area size fwrite (& bihead,40,1,fp2); / / because the grayed image has a color table, create a color table and save pColorTable=new RGBQUAD [256]; for

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