Function opencv::photo::illumination_change

pub fn illumination_change(
    src: &dyn ToInputArray, 
    mask: &dyn ToInputArray, 
    dst: &mut dyn ToOutputArray, 
    alpha: f32, 
    beta: f32
) -> Result<()>

Applying an appropriate non-linear transformation to the gradient field inside the selection and then integrating back with a Poisson solver, modifies locally the apparent illumination of an image.

Parameters

• src: Input 8-bit 3-channel image.
• mask: Input 8-bit 1 or 3-channel image.
• dst: Output image with the same size and type as src.
• alpha: Value ranges between 0-2.
• beta: Value ranges between 0-2.

This is useful to highlight under-exposed foreground objects or to reduce specular reflections.

C++ default parameters

• alpha: 0.2f
• beta: 0.4f