No get method providing array access - error when assigning new values to the matrix

Question

I am working with opencv on android for the development of an image segmentation application, but specifically with the watershed algorithm. I'm opening the image and creating a mask with the same size as the image and passing 0 for all the rows and columns of that mask. However, in the following step, which is to add new values for certain rows and columns of this matrix, I have the error: No get method providing array access With that, I am not able to pass the new values to the matrix, can someone help me with this?

COde:

   // Load the image
   val srcOriginal = Imgcodecs.imread(currentPhotoPath)

    // Create a blank image of zeros (same dimension as img)
    val markers = Mat.zeros(srcOriginal.rows(), srcOriginal.cols(), CvType.CV_32F)

    // Example assigning a new value to a matrix index
    markers.put(0,0,255)

Error:

Mahmoud Hossam · Answer 1 · 2020-05-28T11:37:38.620

1

try this:

markers.put(0,0,X);

where x is array containing pixel vales (because it may be RGB,GRAY SCALE,etc) In Java you can use Mat::get() and Mat::put() methods.

Read this for more details.

edited May 28 '20 at 11:37

answered May 27 '20 at 21:21

Mahmoud Hossam

139
10

Mahmoud, I did as you suggested, but I have a new error that I updated in the question – Carlos Diego May 27 '20 at 21:25
Instead of 255 use array with RGB value – Mahmoud Hossam May 28 '20 at 11:34

score 1 · Accepted Answer · answered May 28 '20 at 06:22

1

OpenCV library in java doesn't take input Int as a parameter. You can see in the method declaration https://docs.opencv.org/3.4/javadoc/org/opencv/core/Mat.html#get(int,int,int%5B%5D).

Pass an IntArray for RGB values along with row and col values:

// Replace row and col with your values
markers.put(row, col, intArrayOf(0,0,255))

answered May 28 '20 at 06:22

Animesh Sahu

7,445
2
21
49

Animesh you can helpe me here: https://stackoverflow.com/questions/62067408/for-input-string-mat-00cv-32fc1-iscont-true-issubmat-false-nativeobj-0x – Carlos Diego May 28 '20 at 14:37
1

@Carlos Diego looks like there is some problem in the toInt() call, will see your problem later when I'm free, upvoted. – Animesh Sahu May 28 '20 at 14:44
Thank you so much. see you later – Carlos Diego May 28 '20 at 14:48

No get method providing array access - error when assigning new values ​to the matrix

2 Answers2

No get method providing array access - error when assigning new values to the matrix