Function landweber 

pub fn landweber(
    image: &DynamicImage,
    psf: &Kernel2D,
) -> Result<(DynamicImage, SolveReport)>

Restore an image with Landweber least-squares iteration.

Errors

Returns an error for invalid PSFs, empty or non-finite image data, invalid solver parameters, or non-convergent step-size estimation.