Java 中的 OpenCV drawContours
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OpenCV drawContours in Java
提问by Brunts
I'm trying to draw contours around object in image but i get error
OpenCV Error: Unsupported format or combination of formats ([Start]FindContours supports only CV_8UC1 images when mode != CV_RETR_FLOODFILL otherwise supports CV_32SC1 images only) in cvStartFindContours, file C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\imgproc\src\contours.cpp, line 198
我正在尝试在图像中的对象周围绘制轮廓，但出现错误
OpenCV Error: Unsupported format or combination of formats ([Start]FindContours supports only CV_8UC1 images when mode != CV_RETR_FLOODFILL otherwise supports CV_32SC1 images only) in cvStartFindContours, file C:\builds\master_PackSlaveAddon-win64-vc12-static\opencv\modules\imgproc\src\contours.cpp, line 198
I tried to convert image but error is still there how to use DrawContour?
我尝试转换图像但错误仍然存在 如何使用 DrawContour？
Mat imageInMat = Imgcodecs.imread("C:/Users/ja/workspace/imgtomath/bin/imgtomath/lena.png");
if(imageInMat.empty()== true)
{System.out.println("Error no image found!!");}
imageInMat.convertTo(imageInMat, CvType.CV_32SC1);
List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
Mat hierarchy = new Mat();
Imgproc.findContours(imageInMat, contours, hierarchy, Imgproc.RETR_FLOODFILL, Imgproc.CHAIN_APPROX_SIMPLE);
Imgproc.drawContours(imageInMat, contours, -1, new Scalar(255,0,0));
回答by Kornel
It should work properly:
它应该可以正常工作：
Mat image = Imgcodecs.imread("C:/Users/ja/workspace/imgtomath/bin/imgtomath/lena.png");
if(image.empty() == true) {
System.out.println("Error: no image found!");
}
List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
Mat image32S = new Mat();
image.convertTo(image32S, CvType.CV_32SC1);
Imgproc.findContours(image32S, contours, new Mat(), Imgproc.RETR_FLOODFILL, Imgproc.CHAIN_APPROX_SIMPLE);
// Draw all the contours such that they are filled in.
Mat contourImg = new Mat(image32S.size(), image32S.type());
for (int i = 0; i < contours.size(); i++) {
Imgproc.drawContours(contourImg, contours, i, new Scalar(255, 255, 255), -1);
}
Highgui.imwrite("debug_image.jpg", contourImg); // DEBUG
