CODEWITHSUNDEEP
c++opencv
spora
spora

Reputation: 21

What is the meaning of Scalar(0,0,0,)?

Hello i want to ask what is this line of code do?

Mat res(img.rows, img.cols, CV_8UC1, Scalar(0,0,0));

i'm guessing it's making matrix of image rows and columns but i still don't understand what's the Scalar(0,0,0) for?

Upvotes: 2

Views: 674

Answers (1)

J. Calleja
J. Calleja

Reputation: 4905

From the documentation of OpenCV, you are using the fourth constructor:

Mat (int rows, int cols, int type, const Scalar &s);

The third argument is the array type for the elements of the matrix. You are using CV_8UC1: 8-bit single-channel array.

The fourth argument is an optional value to initialize each matrix element with. Scalar is simmilar to a 4x1 vector. However, since you have specified a single channel, only the first value will be copied to the matrix elements. If you had specified more channels, the remaining elements of Scalar would be used.

Upvotes: 2

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