Function imageproc::contrast::adaptive_threshold

pub fn adaptive_threshold(image: &GrayImage, block_radius: u32) -> GrayImage

Applies an adaptive threshold to an image.

This algorithm compares each pixel's brightness with the average brightness of the pixels in the (2 * block_radius + 1) square block centered on it. If the pixel if at least as bright as the threshold then it will have a value of 255 in the output image, otherwise 0.