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Here, mat will be your originalMat. Rect roi = new Rect(40, 100, 100, 120); Mat cropped = new Mat(mat, roi);

Rect roi = new Rect(40, 100, 100, 120); Mat cropped = new Mat(mat, roi);

Here, mat will be your originalMat.

Rect roi = new Rect(40, 100, 100, 120);
 Mat cropped = new Mat(mat, roi); 
roi);

Here, mat will be your originalMat.

Rect roi = new Rect(40, 100, 100, 120);
Mat cropped = new Mat(mat, roi);