initialize an OpenCV Mat with an 2D array

Question

In my application, I want to create a OpenCV Mat A (2-Dimensions) having some values and then pass it to another OpenCV function using A as input. Currently, I'm trying: ``` // float data[2][5] = {{1,2,3,4,5},{7,8,9,10,11}}; // OR float data[10] = {1,2,3,4,5,7,8,9,10,11}; // and then // A = Mat(1, 5, CV_32FC1, &data, 2); // init from float 1D - array // OR A = Mat(2, 5, CV_32FC1, &data, 2); ``` in case of 1D array, the value passing is OK. But this does not work for 2D array, which is even more a common case. How can I solve this in OpenCV??

Accepted Answer

Originally, I used the mnemonic from OpenCV online guides:

```
Mat::Mat(Size size, int type, void* data, size_t step=AUTO_STEP)
```

But I didn't understand what the document meant by `size_t step=AUTO_STEP`. And this means that I can omit the `step` argument with which OpenCV will automatically choose `AUTO_STEP`

I've tried and this works:

```
A = Mat(2, 5, CV_32FC1, &data);
```

for the 2D Mat initialized from array

initialize an OpenCV Mat with an 2D array

Solution

Problem