OpenCV 3.0.0 MSER Binary Mask

Refer from http://stackoverflow.com/questions/28515084/opencv-3-0-0-mser-binary-mask

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I am trying to use MSER algorithm in OpenCV 3.0.0 beta to extract text regions from an image. At the end I need a binary mask with the detected MSER regions, but the algorithm only provides contours. I tried to draw these contours but I don't get the expected result.

This is the code I use:

void mserExtractor (const Mat& image, Mat& mserOutMask){    Ptr<MSER> mserExtractor  = MSER::create();    vector<vector<cv::Point>> mserContours;    vector<cv::Rect> mserBbox;    mserExtractor->detectRegions(image, mserContours, mserBbox);    for( int i = 0; i<mserContours.size(); i++ )    {        drawContours(mserOutMask, mserContours, i, Scalar(255, 255, 255), 4);    }}

This is the result:

The problem is that non-convex regions are filled by lines crossing the actual MSER region. I would like just the list of pixels in the region like I get from MATLABdetectMSERFeatures:

Any ideas how to get the filled region from the contours (or to get the MSER mask in other ways)?

c++opencv matlab-cvst mser opencv-drawcontour

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editedFeb 24 at 21:17

Dima
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asked Feb 14 at 11:18

user3038460
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1 Answer

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up vote4 down vote

I found the solution! Just loop over all the points and draw them!

void mserExtractor (const Mat& image, Mat& mserOutMask){    Ptr<MSER> mserExtractor  = MSER::create();    vector<vector<cv::Point>> mserContours;    vector<KeyPoint> mserKeypoint;    vector<cv::Rect> mserBbox;    mserExtractor->detectRegions(image, mserContours,  mserBbox);    for (vector<cv::Point> v : mserContours){        for (cv::Point p : v){            mserOutMask.at<uchar>(p.y, p.x) = 255;        }    }}