Module contrast

Functions for manipulating the contrast of images.

Functions

adaptive_threshold

Applies an adaptive threshold to an image.

equalize_histogram

Equalises the histogram of an 8bpp grayscale image. See also histogram equalization (wikipedia).

equalize_histogram_mut

Equalises the histogram of an 8bpp grayscale image in place. See also histogram equalization (wikipedia).

match_histogram

Adjusts contrast of an 8bpp grayscale image so that its histogram is as close as possible to that of the target image.

match_histogram_mut

Adjusts contrast of an 8bpp grayscale image in place so that its histogram is as close as possible to that of the target image.

otsu_level

Returns the Otsu threshold level of an 8bpp image.

stretch_contrast

Linearly stretches the contrast in an image, sending lower to 0u8 and upper to 2558u8.

stretch_contrast_mut

Linearly stretches the contrast in an image in place, sending lower to 0u8 and upper to 2558u8.

threshold

Returns a binarized image from an input 8bpp grayscale image obtained by applying the given threshold. Pixels with intensity equal to the threshold are assigned to the background.

threshold_mut

Mutates given image to form a binarized version produced by applying the given threshold. Pixels with intensity equal to the threshold are assigned to the background.