Detecting a pattern in an image using JavaCV

Question

I am trying to create code that should recognize some pattern / figure in the picture at the end.

I had problems when I tried to draw a figure in fig. ("Output3" in this case). The program does not seem to end. I think there is an infinite loop with a while function. The program does not display output 3. What is the problem?

Image INPUT:

Image OUTPUT2:

---

public class Hello {

/**
 * @param args
 * @throws IOException 
 */

public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub

    // Memory storage
    CvMemStorage memory = CvMemStorage.create();
    CvSeq contours = new CvSeq(null);

    // Display original contour image .png, then GRAYSCALE and display in CanvasFrame
    IplImage image = cvLoadImage("contour.jpg", CV_LOAD_IMAGE_GRAYSCALE);   
    CanvasFrame canvas = new CanvasFrame("Output", 1);
    CanvasFrame canvas2 = new CanvasFrame("Output2", 1);
    CanvasFrame canvas3 = new CanvasFrame("Output3", 1);
    canvas.showImage(image);

    // thresholding
    cvSmooth(image, image, CV_BLUR, 9 , 9, 2, 2);
    cvThreshold(image, image, 155, 255, CV_THRESH_BINARY);

    cvCanny(image, image, 20*7*7, 40*7*7, 7);
    cvDilate(image, image, null, 1);


    canvas2.showImage(image);
    cvSaveImage("output2.jpg", image);

    // finding contours
    cvFindContours(image, memory, contours, Loader.sizeof(CvContour.class), CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0));

    while(contours != null && !contours.isNull()) {
        if(contours.elem_size() > 0) {
            CvSeq approx = cvApproxPoly(contours, Loader.sizeof(CvContour.class), memory, CV_POLY_APPROX_DP, (int) cvContourPerimeter(contours)*0.02, 0);
            cvDrawContours(image, approx, CvScalar.BLUE, CvScalar.BLUE, -1,1, CV_AA);
        }
        contours.h_next();
    }

    canvas3.showImage(image);
}

My goal is to take a picture, send it to the program, which should return:

• It's a square
• It's a rectangle
• It's a circle
• It's a hexagon

Answer 1

I do not use JavaCV, but here is what I would do:

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