public static Mat warp(Mat inputMat, Mat startM, int factor) {
int resultWidth = 400 * factor;
int resultHeight = 240 * factor;
Mat outputMat = new Mat(resultWidth, resultHeight, CvType.CV_8UC4);
Point ocvPOut1 = new Point(0, 0);
Point ocvPOut2 = new Point(0, resultHeight);
Point ocvPOut3 = new Point(resultWidth, resultHeight);
Point ocvPOut4 = new Point(resultWidth, 0);
List<Point> dest = new ArrayList<Point>();
dest.add(ocvPOut1);
dest.add(ocvPOut2);
dest.add(ocvPOut3);
dest.add(ocvPOut4);
Mat endM = Converters.vector_Point2f_to_Mat(dest);
Mat perspectiveTransform = Imgproc.getPerspectiveTransform(startM, endM);
Imgproc.warpPerspective(
inputMat,
outputMat,
perspectiveTransform,
new Size(resultWidth, resultHeight),
Imgproc.INTER_AREA);
Imgproc.GaussianBlur(outputMat, outputMat, new org.opencv.core.Size(5, 5), 5);
Imgproc.resize(outputMat, outputMat, new Size(resultWidth / factor, resultHeight / factor));
Imgproc.threshold(outputMat, outputMat, 127, 255, Imgproc.THRESH_TOZERO);
return outputMat;
}
private static Bitmap imgtrafo(
Bitmap image1,
Bitmap image2,
int p1_x,
int p1_y,
int p2_x,
int p2_y,
int p3_x,
int p3_y,
int p4_x,
int p4_y) {
// set output size same size as input
int resultWidth = image1.getWidth();
int resultHeight = image1.getHeight();
Mat inputMat = new Mat(image1.getWidth(), image1.getHeight(), CvType.CV_32FC1);
Utils.bitmapToMat(image1, inputMat);
Mat outputMat = new Mat(resultWidth, resultHeight, CvType.CV_32FC1);
Point ocvPIn1 = new Point(p1_x, p1_y);
Point ocvPIn2 = new Point(p2_x, p2_y);
Point ocvPIn3 = new Point(p3_x, p3_y);
Point ocvPIn4 = new Point(p4_x, p4_y);
List<Point> source = new ArrayList<Point>();
source.add(ocvPIn1);
source.add(ocvPIn2);
source.add(ocvPIn3);
source.add(ocvPIn4);
Mat inputQuad = Converters.vector_Point2f_to_Mat(source);
Point ocvPOut1 = new Point(256, 40); // manually set
Point ocvPOut2 = new Point(522, 62);
Point ocvPOut3 = new Point(455, 479);
Point ocvPOut4 = new Point(134, 404);
List<Point> dest = new ArrayList<Point>();
dest.add(ocvPOut1);
dest.add(ocvPOut2);
dest.add(ocvPOut3);
dest.add(ocvPOut4);
Mat outputQuad = Converters.vector_Point2f_to_Mat(dest);
Mat perspectiveTransform = Imgproc.getPerspectiveTransform(inputQuad, outputQuad);
Imgproc.warpPerspective(
inputMat, outputMat, perspectiveTransform, new Size(resultWidth, resultHeight)); // ?
Bitmap output = Bitmap.createBitmap(resultWidth, resultHeight, Bitmap.Config.RGB_565);
Utils.matToBitmap(outputMat, output);
return output;
}