How to use MSER correctly?

asked 2017-10-13 18:22:01 -0600

jenia2010 gravatar image

updated 2017-10-14 10:19:29 -0600


I want to use MSER to detect text. Something along these lines.

So I wrote this function:

private void detectRegions() {
    /** INIT **/
    int delta = 5;
    int min_area = 60;
    int max_area = 14400;
    double max_variation = 0.25;
    double min_diversity = .2;
    int max_evolution = 200;
    double area_threshold = 1.01;
    double min_margin = .003;
    int edge_blur_size = 5;
    int imgsize = mGrey.height() * mGrey.width();
    List<MatOfPoint> msers = new ArrayList<MatOfPoint>();
    MatOfRect bboxes = new MatOfRect();

    MSER mser = MSER.create(delta, min_area, max_area, max_variation, min_diversity, max_evolution, area_threshold, min_margin, edge_blur_size);
    mser.detectRegions(mGrey, msers, bboxes);

But I get complete garbage. Lots of totally absurd text.

So I'm wondering what I'm doing wrong?

I found this example on Github.

Maybe I need to use these two functions somehow:

Imgproc.morphologyEx(mask, morbyte, Imgproc.MORPH_DILATE, kernel);
Imgproc.findContours(morbyte, contour2, hierarchy,
                Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_NONE);

Also, what is all that Rectangle manipulations doing? Also, how does that feed into the two functions above?


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