private Mat rotateImage(Mat src, double angle) {
Point center = new Point(src.cols() / 2, src.rows() / 2);
double scale = 1.0;
Mat rotateMat = Imgproc.getRotationMatrix2D(center, angle, scale);
Mat dst = new Mat();
Size frameSize = new Size(src.rows(), src.cols());
// adjust dst center point
double m[] = new double[6];
rotateMat.get(0, 0, m);
m[2] += (frameSize.width - src.cols()) / 2;
m[5] += (frameSize.height - src.rows()) / 2;
rotateMat.put(0, 0, m);
Imgproc.warpAffine(
src,
dst,
rotateMat,
frameSize,
Imgproc.INTER_LINEAR,
Imgproc.BORDER_CONSTANT,
Scalar.all(0));
return dst;
}
public Mat onCameraFrame(Mat inputFrame) {
inputFrame.copyTo(mRgba);
Point center = new Point(mRgba.width() / 2, mRgba.height() / 2);
double angle = -90;
double scale = 1.0;
Mat mapMatrix = Imgproc.getRotationMatrix2D(center, angle, scale);
Imgproc.warpAffine(mRgba, mGrayMat, mapMatrix, mRgba.size(), Imgproc.INTER_LINEAR);
return mGrayMat;
}
/**
* Rotate a Mat by the specified degree
*
* @param src The source Mat
* @param angle The angle by which to rotate by
* @return The rotated Mat
*/
public static Mat rotate(Mat src, double angle) {
int len = src.cols() > src.rows() ? src.cols() : src.rows();
Point pt = new Point(len / 2.0, len / 2.0);
Mat r = Imgproc.getRotationMatrix2D(pt, angle, 1.0);
Mat dst = new Mat();
Imgproc.warpAffine(src, dst, r, new Size(len, len));
return dst;
}
public Mat rotateImage(Mat image, int angle, boolean cropEdges) {
Mat rotatedImage = new Mat();
Mat M = Imgproc.getRotationMatrix2D(new Point(halfGenImageSize, halfGenImageSize), angle, 1);
Imgproc.warpAffine(image, rotatedImage, M, new Size(genImageSize, genImageSize));
if (cropEdges) {
Rect roi =
new Rect(
(genImageSize - croppedImageSize) / 2,
(genImageSize - croppedImageSize) / 2,
croppedImageSize,
croppedImageSize);
rotatedImage = new Mat(rotatedImage, roi);
}
return rotatedImage;
}