【OpenCV】簡單高效地訪問映像像素

標籤：opencv

對於單通道位元組型映像:

IplImage* img  = cvCreateImage(cvSize(640,480),IPL_DEPTH_8U,1);int height     = img->height;int width      = img->width;int step       = img->widthStep;uchar* data    = (uchar *)img->imageData;//這裡注意step不能換成width，資料會4位元組對齊，step指每行像素所佔位元組數data[i*step+j] = 100;

對於多通道位元組型映像:

IplImage* img  = cvCreateImage(cvSize(640,480),IPL_DEPTH_8U,3);int height     = img->height;int width      = img->width;int step       = img->widthStep;int channels   = img->nChannels;uchar* data    = (uchar *)img->imageData;data[i*step+j*channels+k] = 100;

對於多通道浮點型映像（假設映像資料採用4位元組（32位）行對齊）:

IplImage* img  = cvCreateImage(cvSize(640,480),IPL_DEPTH_32F,3);int height     = img->height;int width      = img->width;int step       = img->widthStep;int channels   = img->nChannels;float * data    = (float *)img->imageData;data[i*step+j*channels+k] = 100;

【OpenCV】簡單高效地訪問映像像素