Hi!
First I'm poor at English. sorry..
I want vuforia Matrix value -> Opencv X,Y value
My scenario is use Four markers edge get modelviewMatrix -> Capture screen and Make Bitmap.class -> Bitmap to Mat , Warping
-> Mat to Bitmap , save Image -> lol !
but vuforia modelviewMatrix[12], [13] (x,y) value It can not be used opencv
Because opencv start Left top (0,0) vuforia start center (0,0) and
opencv read the resolution of bitmap to 1920x1080. but when vuforia recorded resolution, the resolution of bitmap constantly chainge by distance.
So i wonder to find both opencv and vuforia ratio and calibrate Matrix values.
sorry my poor English T ㅁ T
this is my code. code base vuforia sample FrameMarkerRenderer.java
void renderFrame(){
.......
switch (marker.getMarkerId()) //Four markers edge get modelviewMatrix { case 0: vertices = qObject.getVertices(); normals = qObject.getNormals(); indices = qObject.getIndices(); texCoords = qObject.getTexCoords(); numIndices = qObject.getNumObjectIndex();
Matrix.translateM(modelViewMatrix, 0, kLetterTranslate, -kLetterTranslate, 0.f);
PQ=new Point((double)modelViewProjection[13],(double)modelViewProjection[12]); //AR object translate Maker edge. get matrix
Matrix.scaleM(modelViewMatrix, 0, kLetterScale/4, kLetterScale/4, kLetterScale/4);
Matrix.multiplyMM(modelViewProjection, 0, vuforiaAppSession .getProjectionMatrix().getData(), 0, modelViewMatrix, 0);
......
}
`.......
}
screen captrue code Reference is
https://developer.vuforia.com/library//articles/Solution/How-To-Capture-the-AR-View-on-Android
public Bitmap warping(Bitmap bmp)// Warping
{
Mat input = new Mat(bmp.getWidth(),bmp.getHeight(),CvType.CV_32FC2); Utils.bitmapToMat(bmp,input);
//Bmp -> Mat
SystemClock.sleep(3000); //wating Point ocvin1= new Point(PA.x,PA.y); //Marker edge location Point ocvin2= new Point(PQ.x,PQ.y); Point ocvin3= new Point(PC.x,PC.y); Point ocvin4= new Point(PR.x,PR.y);
List<Point> source = new ArrayList<Point>(); source.add(ocvin1); source.add(ocvin2); source.add(ocvin3); source.add(ocvin4);
Mat startM = Converters.vector_Point2f_to_Mat(source);
Point ocvout1= new Point(0,0); Point ocvout2= new Point(1080,0); Point ocvout3= new Point(1080,1920); Point ocvout4= new Point(0,1920);
List<Point> dest = new ArrayList<Point>(); dest.add(ocvout1); dest.add(ocvout2); dest.add(ocvout3); dest.add(ocvout4);
Mat endM = Converters.vector_Point2f_to_Mat(dest);
try { Mat perspectiveTransform = Imgproc.getPerspectiveTransform(startM, endM); //perspectiveTransform
Mat output = new Mat(1080, 1920, CvType.CV_32FC2);
Imgproc.warpPerspective(input, output, perspectiveTransform, new org.opencv.core.Size(1080, 1920)); //Warping
Bitmap out = Bitmap.createBitmap(1080,1920, Bitmap.Config.ARGB_8888); Utils.matToBitmap(output, out);
SystemClock.sleep(3000);//wating
//crate Bitmap, Mat -> Bitmap */
return out; }
