灰度圖拉伸

<!-- lang: cpp -->

//灰度圖拉伸 void GrayStretch(const IplImage* img_src,IplImage* img_dst) { //img_src 和 img_dst 均爲單通道 uchar *gray_src, *gray_dst; double meanPix,maxPix,minPix;

uchar t1 ;
uchar t2 ;
//cvShowImage("img_src",img_src);
//cvWaitKey(0);
meanPix = cvMean(img_src);
cvMinMaxLoc(img_src,&minPix,&maxPix);
t1 = minPix+(meanPix-minPix)/4;
t2 = maxPix-(maxPix-meanPix)/4;
for( int i=0;i<img_src->height;i++)
	for( int j=0;j<img_src->width;j++)
	{
		gray_src = (uchar*)(img_src->imageData + i*img_src->widthStep + 1*j);
		gray_dst = (uchar*)(img_dst->imageData + i*img_dst->widthStep + 1*j);
		if( gray_src[0] <= t1 )
		{
			gray_dst[0] = 0; 
		}
		else if( gray_src[0] >= t2 ) 
		{
			gray_dst[0] = 255;
		}
		else 
		{
			gray_dst[0] = ( gray_src[0] - t1 )*255/(t2-t1);
		}
	}

}