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.