Scalar object type

The Scalar object type is a template class derived from Vec with four elements. The Scalar type is widely used in OpenCV to pass and read pixel values.

To access Vec and Scalar values, we use the [] operator, which can be initialized from another scalar, vector, or value by value, as in the following sample:

Scalar s0(0);
Scalar s1(0.0, 1.0, 2.0, 3.0);
Scalar s2(s1);