Segmentation using variable thresholds. Threshold values vary over the image as a function of local image characteristics. Local thresholds are position dependent.
Ways of calculating thresholds:
- K1 * local mean + k2 * standard dev
You need a large window size to cover sufficient foreground and background pixels otherwise a poor threshold is chosen.
Saying a pixel is foreground if it belongs to D, a set of gray levels, otherwise it’s background.
Foreground if it’s greater than a certain value, background otherwise.