Function add 

pub fn add(
    src1: &impl ToInputArray,
    src2: &impl ToInputArray,
    dst: &mut impl ToOutputArray,
    mask: &impl ToInputArray,
    dtype: i32,
) -> Result<()>

Calculates the per-element sum of two arrays or an array and a scalar.

The function add calculates:

• Sum of two arrays when both input arrays have the same size and the same number of channels:
• Sum of an array and a scalar when src2 is constructed from Scalar or has the same number of elements as src1.channels():
• Sum of a scalar and an array when src1 is constructed from Scalar or has the same number of elements as src2.channels(): where I is a multi-dimensional index of array elements. In case of multi-channel arrays, each channel is processed independently.

The first function in the list above can be replaced with matrix expressions:

   dst = src1 + src2;
   dst += src1; // equivalent to add(dst, src1, dst);

The input arrays and the output array can all have the same or different depths. For example, you can add a 16-bit unsigned array to a 8-bit signed array and store the sum as a 32-bit floating-point array. Depth of the output array is determined by the dtype parameter. In the second and third cases above, as well as in the first case, when src1.depth() == src2.depth(), dtype can be set to the default -1. In this case, the output array will have the same depth as the input array, be it src1, src2 or both.

Note: Saturation is not applied when the output array has the depth CV_32S. You may even get result of an incorrect sign in the case of overflow.

Note: (Python) Be careful to difference behaviour between src1/src2 are single number and they are tuple/array. add(src,X) means add(src,(X,X,X,X)). add(src,(X,)) means add(src,(X,0,0,0)).

Parameters

• src1: first input array or a scalar.
• src2: second input array or a scalar.
• dst: output array that has the same size and number of channels as the input array(s); the depth is defined by dtype or src1/src2.
• mask: optional operation mask - 8-bit single channel array, that specifies elements of the output array to be changed.
• dtype: optional depth of the output array (see the discussion below).

See also

subtract, addWeighted, scaleAdd, Mat::convertTo

C++ default parameters

• mask: noArray()
• dtype: -1