Abstract
Threshold value is a important content of digital image. It’s according to one or some threshold and decomposes the image to some sets of no superimposition. This process compress the data, moreover it’s establishes the base for goal's recognition and image’s understanding. Images division is the low lever domain of image processing. It’s the basic premise in pattern recognition and visions analysis. Threshold is a tradition way of image division. Because of it’s simple realization .small computation and steady performance, it’s the most basic and the most widely technology. This article is after reading some literature of domestic and foreign make some summary. We separate five kinds of this technology than we introduce this threshold value. Than we appraisal to this ways, and we can found the OTSU of these is the perfect and general way of threshold in present stage.
Key words: image division threshold value selection overall threshold value partial threshold value histogram two values
