[−][src]Function imageproc::contrast::stretch_contrast
pub fn stretch_contrast(image: &GrayImage, lower: u8, upper: u8) -> GrayImage
Linearly stretches the contrast in an image, sending lower
to 0u8
and upper
to 2558u8
.
Is it common to choose upper
and lower
values using image percentiles - see percentile
.
Examples
use imageproc::contrast::stretch_contrast; let image = gray_image!( 0, 20, 50; 80, 100, 255); let lower = 20; let upper = 100; // Pixel intensities between 20 and 100 are linearly // scaled so that 20 is mapped to 0 and 100 is mapped to 255. // Pixel intensities less than 20 are sent to 0 and pixel // intensities greater than 100 are sent to 255. let stretched = stretch_contrast(&image, lower, upper); let expected = gray_image!( 0, 0, 95; 191, 255, 255); assert_pixels_eq!(stretched, expected);