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Convert RGBA byte buffer to OpenCV image?

asked 2013-01-29 21:28:36 -0500

Philip gravatar image

updated 2013-11-13 17:22:08 -0500

I have a byte buffer ( unsigned char * ) of RGBA format, I wish to use this image data in OpenCV, use it as a IplImage. How to convert from this byte buffer to IplImage?

Think I have worked this out myself, still testing.

IplImage* img = cvCreateImage( cvSize(width,height), IPL_DEPTH_8U, 4);
cvSetData(img, buffer, width*4);
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answered 2013-01-29 23:13:59 -0500

You have to cvCreateImageHeader instead of cvCreateImage

unsigned char* buffer;
int width = 100;
int height = 100;
IplImage* img1 =    cvCreateImageHeader(cvSize(width,height),IPL_DEPTH_8U,4);
cvSetData(img1,buffer,img1->widthStep);
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Comments

Can you tell me why?

Philip gravatar imagePhilip ( 2013-01-30 08:58:52 -0500 )edit

Because the data is there and you need to create header for data instead of create image.

Mostafa Sataki gravatar imageMostafa Sataki ( 2013-01-30 09:16:44 -0500 )edit
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Asked: 2013-01-29 21:28:36 -0500

Seen: 4,685 times

Last updated: Jan 29 '13