Question

I have just discovered CvBlobsLib that can be a bless but it sadly uses IplImage.
Is there any chance that there is a new cv::Mat-style edition I just don’t happen to find it?

EDIT:

It turned out that I happened to discover 2 distinct libraries, CvBlobsLib and CvBlobs, yeehaa. 🙂
I saw CvBlobsLib is less used than cvBlobs, that is NOT on opencv willowgarage but on google code. I welcome answers for both libraries, though, as both work with IplImage. 🙂

Answer 1

EDIT: I’m talking about cvBlobs in this answer, sorry that I messed it up with cvBlobsLib …

I’ve been looking for this too, but didn’t came up with any library, which uses the new image structure.

But actually you can always do this: IplImage iplImg = mat; and just use &iplimg wherever you need an IplImage*.

I used cvBlobs this way successful in a few projects:

#include <cvblob.h>
using namespace cvb;

// load image
cv::Mat mat = cv::imread("image.jpg");

// convert cv::Mat to IplImage
IplImage img = mat;

// convert to grayscale
IplImage *gray = cvCreateImage( cvGetSize(&img), IPL_DEPTH_8U, 1 );
cvCvtColor( &img, gray, CV_BGR2GRAY );

// get binary image
cvThreshold( gray, gray, 150, 255, CV_THRESH_BINARY );

// get blobs
IplImage *labelImg = cvCreateImage( cvGetSize(gray), IPL_DEPTH_LABEL, 1 );
CvBlobs blobs;
unsigned int result = cvLabel( gray, labelImg, blobs );

// render blobs in original image
cvRenderBlobs( labelImg, blobs, &img, &img );

// *always* remember freeing unused IplImages
cvReleaseImage( labelImg );
cvReleaseImage( gray ); 

// convert back to cv::Mat
cv::Mat output( &img );