IntegralThreshold

Adaptive Thresholding Using the Integral Image.

Based on https://github.com/phryniszak/AdaptiveIntegralThresholding Converted to Python. For more details, please read this papaer Adaptive Thresholding Using the Integral Image.

This method can preserve more image details as the table shows.

test image	OTSU Thresholding
Adaptive Thresholding	Adaptive Thresholding Using the Integral Image

The code is simple but the speed is insanely slow when the image is very large; and I use numba to speed up. The original code consumes more than 3 minutes for processing this test image while it only costs about 1 second with numba.