Function copy_make_border 

pub fn copy_make_border(
    src: &impl ToInputArray,
    dst: &mut impl ToOutputArray,
    top: i32,
    bottom: i32,
    left: i32,
    right: i32,
    border_type: i32,
    value: Scalar,
    stream: &mut impl StreamTrait,
) -> Result<()>

Forms a border around an image.

Parameters

• src: Source image. CV_8UC1 , CV_8UC4 , CV_32SC1 , and CV_32FC1 types are supported.
• dst: Destination image with the same type as src. The size is Size(src.cols+left+right, src.rows+top+bottom) .
• top: Number of top pixels
• bottom: Number of bottom pixels
• left: Number of left pixels
• right: Number of pixels in each direction from the source image rectangle to extrapolate. For example: top=1, bottom=1, left=1, right=1 mean that 1 pixel-wide border needs to be built.
• borderType: Border type. See borderInterpolate for details. BORDER_REFLECT101 , BORDER_REPLICATE , BORDER_CONSTANT , BORDER_REFLECT and BORDER_WRAP are supported for now.
• value: Border value.
• stream: Stream for the asynchronous version.

C++ default parameters

• value: Scalar()
• stream: Stream::Null()