When T is a constant applicable over an entire image, the process given in thisequation is referred to as global thresholding. When the value of T changes over an image, we use the term variable thresholding. The term local or regional thresholding is used sometimes to denote variable thresholding in which the value of Tat any point (x, y) in an image depends on properties of a neighborhood of (x, y) (for example, the average intensity of the pixels in the neighborhood). If T depends on the spatial coordinates (x, y) themselves, then variable thresholding is often referred to as dynamic or adaptive thresh• olding. Use of these terms is not universal, and one is likely to see them used interchangeably in the literature on image processing.
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