contrast_enhancer¶

contrast_enhancer(img, low_p=2, high_p=98)[source]¶

Enhance contrast of the input image using intensity adjustment.

This method uses both image low and high percentiles.

Parameters:

  • img (numpy.ndarray) – input image used to obtain tissue mask. Image should be uint8.

  • low_p (scalar) – low percentile of image values to be saturated to 0.

  • high_p (scalar) – high percentile of image values to be saturated to 255. high_p should always be greater than low_p.

Returns:

Image (uint8) with contrast enhanced.

Return type:

img (numpy.ndarray)

Raises:

AssertionError – Internal errors due to invalid img type.

Examples

>>> from tiatoolbox import utils
>>> img = utils.misc.contrast_enhancer(img, low_p=2, high_p=98)