gammacorrection.c

来自「5402DSP程序设计语言」· C语言 代码 · 共 75 行

/***********************************************************************
** Main Function Program
***********************************************************************/ 

#include "math.h"
#include "stdio.h"
#define IMAGE_WIDTH 64
#define IMAGE_HEIGTH 64

 main()
{
	FILE *fi;
	int i,j,k;
	int y[IMAGE_HEIGTH][IMAGE_WIDTH];
	unsigned char id[64];

	k=128;  /*k is Threshold Value*/

	fi=fopen("D:\\Tu\\Lena64.bmp","rb");

	for (i=0; i<=16; i++)
	{
		fread((char *)id,sizeof(char),IMAGE_WIDTH,fi);
	}
	
	fread((char *)id,sizeof(char),54,fi);
	
	for (i=0; i<IMAGE_HEIGTH; i++)
	{
		fread((char *)id,sizeof(char),IMAGE_WIDTH,fi);
		
		for (j=0; j<IMAGE_WIDTH; j++)
		{
			y[i][j]=id[j];
		}
	}
	
	fclose(fi);
	i=0;
	
	for (i=0; i<IMAGE_HEIGTH; i++)
	{
		for (j=0; j<IMAGE_WIDTH; j++)
		{
			y[i][j] = (255-y[i][j]);
		}
	}
	
	i=0;
	
	for (i=0; i<IMAGE_HEIGTH; i++)
	{
		for (j=0; j<IMAGE_WIDTH; j++)
		{
			y[i][j] = 255*((255-y[i][j])/k);
		}
	}
	
	i=0;
	i=0;
}
/***********************************************************************
** End of File 
***********************************************************************/