Example usage for org.opencv.core Core copyMakeBorder

Introduction

In this page you can find the example usage for org.opencv.core Core copyMakeBorder.

Prototype

public static void copyMakeBorder(Mat src, Mat dst, int top, int bottom, int left, int right, int borderType,
            Scalar value) 

Source Link

Usage

From source file:org.akvo.caddisfly.sensor.colorimetry.strip.util.ResultUtil.java

License:Open Source License

@NonNull
public static Mat createStripMat(@NonNull Mat mat, @NonNull Point centerPatch, boolean grouped, int maxWidth) {
    //done with lab schema, make rgb to show in image view
    // mat holds the strip image
    Imgproc.cvtColor(mat, mat, Imgproc.COLOR_Lab2RGB);

    int rightBorder = 0;

    double ratio;
    if (mat.width() < MIN_STRIP_WIDTH) {
        ratio = MAX_STRIP_HEIGHT / mat.height();
        rightBorder = BORDER_SIZE;//from  w w w.  ja v  a  2  s.c o  m
    } else {
        ratio = (double) (maxWidth - 10) / (double) mat.width();
    }

    Imgproc.resize(mat, mat, new Size(mat.width() * ratio, mat.height() * ratio));

    Core.copyMakeBorder(mat, mat, BORDER_SIZE + ARROW_TRIANGLE_HEIGHT, BORDER_SIZE * 2, 0, rightBorder,
            Core.BORDER_CONSTANT,
            new Scalar(MAX_RGB_INT_VALUE, MAX_RGB_INT_VALUE, MAX_RGB_INT_VALUE, MAX_RGB_INT_VALUE));

    // Draw an arrow to the patch
    // only draw if this is not a 'grouped' strip
    if (!grouped) {
        double x = centerPatch.x * ratio;
        double y = 0;
        MatOfPoint matOfPoint = new MatOfPoint(new Point((x - ARROW_TRIANGLE_LENGTH), y),
                new Point((x + ARROW_TRIANGLE_LENGTH), y), new Point(x, y + ARROW_TRIANGLE_HEIGHT),
                new Point((x - ARROW_TRIANGLE_LENGTH), y));

        Imgproc.fillConvexPoly(mat, matOfPoint, DARK_GRAY, Core.LINE_AA, 0);
    }
    return mat;
}

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