Java-OpenCV错误：OpenCV错误：断言失败（dims <= 2 && step [0]> 0）

Question

I have this opencv code. Which makes a convolution to an image that I found in a page. I wanted to try it, but it gives the following error and I do not know much about openCV. I need help.

Error: OpenCV Error: Assertion failed (dims <= 2 && step[0] > 0) in cv::Mat::locateROI, file C:\\build\\master_winpack-bindings-win64-vc14-static\\opencv\\modules\\core\\src\\matrix.cpp, line 949

 public class main { public static void main (String [ ] args) { System.out.println ("hola"); try { int kernelSize = 3; System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); Mat source = Imgcodecs.imread("logo.png", Imgcodecs.CV_LOAD_IMAGE_GRAYSCALE); Mat destination = new Mat(source.rows(),source.cols(),source.type()); Mat kernel = new Mat(kernelSize,kernelSize, CvType.CV_32F){ { put(0,0,0); put(0,1,0); put(0,2,0); put(1,0,0); put(1,1,1); put(1,2,0); put(2,0,0); put(2,1,0); put(2,2,0); } }; Imgproc.filter2D(source, destination, -1, kernel); Imgcodecs.imwrite("original.jpg", destination); } catch (Exception e) { System.out.println("Error: " + e.getMessage()); } } } 

Answer 1

Had the same error and followed the very valuable hint of @Miki. In my case the image wasn't loaded properly because of unsuitable bit-depth. 32 instead of 8 bit for a greyscale image.

Answer 2

看起来您的源和目标是单通道，而您的内核是3通道。

Answer 3

I had the same exact error before so when I wrote the whole path of the picture, My code worked very well , so be careful with the extension of the image and make sure that your picture exists

Here is what I did :

pic = cv2.imread('C:\Users\WSI\Desktop\python_scripts\hakuoki.jpg',cv2.IMREAD_COLOR)

Answer 4

I had the same error, I wrote png instead of jpg in the file name. Make sure you load image with the proper extension/name