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This article analyzes how to understand the submatrix Rect. The content is detailed and easy to understand, and friends who are interested in how to understand the sub-matrix Rect can follow the editor's train of thought to read it deeply. I hope it will be helpful to you after reading. Let's follow the editor to learn more about how to understand the sub-matrix Rect.

1. The prototype of the function is:

Caterpillar: Mat Mat::operator () (const Rect& roi) const

2. The test code is as follows:

Double m [3] [3] =

{{1, 3, 1}

{4, 8, 7}

{6, 2, 4}

}

Mat testMat (3Jing 3GI CVQ 64FC1 Magi m)

Cout

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