Learning OpenCV, 2nd Edition

Figure 3-1: The face of a child is alpha blended onto the face of a cat

cv::bitwise_and()

void cv::bitwise_and(

cv::InputArray src1, // First input array

cv::InputArray src2, // Second input array

cv::OutputArray dst, // Result array

cv::InputArray mask = cv::noArray(), // Optional mask, compute only where nonzero

)

dst

i

= src1

i

∧ src2

i

cv::bitwise_and() is a per-element bitwise conjunction operation. For every element in src1, the

bitwise AND is computed with the corresponding element in src2 and put into the corresponding element

of dst.

If you are not using a mask, the same result can be achieved with the matrix operation:

dst = src1 & src2;

cv::bitwise_not()

void cv::bitwise_not(

cv::InputArray src, // Input array

cv::OutputArray dst, // Result array

cv::InputArray mask = cv::noArray(), // Optional mask, compute only where nonzero

)

dst

i

=∼ src1

i

cv::bitwise_not() is a per-element bitwise inversion operation. For every element in src1 the

logical inversion is computed and placed into the corresponding element of dst.

If you are not using a mask, the same result can be achieved with the matrix operation:

dst = !src1;

cv::bitwise_or()

void cv::bitwise_and(

cv::InputArray src1, // First input array

cv::InputArray src2, // Second input array