Question

我正在尝试对四边形物体进行自动透视校正。

当我使用getPerspectiveTransform函数时，我收到错误：

OpenCV Error: Assertion failed (src.checkVector(2, CV_32F) == 4 && dst.checkVector(2, CV_32F) == 4) in cv::getPerspectiveTransform

这是我的代码：

        Mat originalMat = new Mat();
        originalMat=Imgcodecs.imread("photo.jpg");
        Mat binaryMat = new Mat();

        Imgproc.cvtColor(originalMat, binaryMat, Imgproc.COLOR_BGR2GRAY);
        Imgproc.threshold(binaryMat, binaryMat, 0 , 255, Imgproc.THRESH_OTSU | Imgproc.THRESH_BINARY);

        List<MatOfPoint> contours = new ArrayList<>();
        Imgproc.findContours(binaryMat.clone(), contours, new Mat(), Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_SIMPLE);

        int largestContour=0, tempContour, largestContourIndex=0;

        if(contours.size()>1)
        for (int i = 0; i < contours.size(); i++) {

            MatOfPoint2f mop2f = new MatOfPoint2f();
            contours.get(i).convertTo(mop2f, CvType.CV_32F);         
            RotatedRect rect = Imgproc.minAreaRect(mop2f);           

            tempContour = rect.boundingRect().width * rect.boundingRect().height;
            if(largestContour < tempContour){
                largestContour = tempContour;
                largestContourIndex = i;
            }
        }


        Rect rectangle = Imgproc.boundingRect(contours.get(largestContourIndex));
        Point[] boundingRectPoints = new Point[4];                              
        boundingRectPoints[0] = new Point(rectangle.x,rectangle.y);
        boundingRectPoints[1] = new Point((rectangle.x+rectangle.width),rectangle.y);
        boundingRectPoints[2] = new Point(rectangle.x+rectangle.width,rectangle.y+rectangle.height);
        boundingRectPoints[3] = new Point(rectangle.x,rectangle.y+rectangle.height);
        MatOfPoint boundingRTMatOfPoint = new MatOfPoint(boundingRectPoints);


        Mat beforeCorrectionMat = new Mat();
        Mat afterCorrectionMat = new Mat();
        contours.get(largestContourIndex).convertTo(beforeCorrectionMat, CvType.CV_32FC2);
        boundingRTMatOfPoint.convertTo(afterCorrectionMat, CvType.CV_32FC2);



        Mat transmtx = Imgproc.getPerspectiveTransform( beforeCorrectionMat, afterCorrectionMat);
        Mat transformed = Mat.zeros(originalMat.height(), originalMat.width(), CvType.CV_8UC1);
        Imgproc.warpPerspective(originalMat, transformed, transmtx, originalMat.size());

我在这里找到了类似的问题：Assertion failed when I'm trying to use getPerspectiveTransform on Android-NDK to transform a perspective image

但它对我没有帮助。我会非常感谢任何帮助。

GetPerspectiveTransform函数错误| opencv |的java

0 个答案: