Advances in Image and Graphics Technologies by Tieniu Tan Guoping Wang Shengjin Wang Yue Liu Xiaoru Yuan Ran He & Sheng Li

Author:Tieniu Tan, Guoping Wang, Shengjin Wang, Yue Liu, Xiaoru Yuan, Ran He & Sheng Li
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

(2)Sequencing in descending order, deleting repeated gradient values, only keeping different gradient values, and at the same time counting the frequency of each value occurring in , to get gradient set and frequency set .

(3)Calculating frequency of each gradient value ( is the total number of pixel points).

(4)According to high and low thresholds to divide set and obtaining subsets , and .

(5)Calculating average value , and of each subset. In which, , and are respectively numbers of elements contained in corresponding subset; , and are frequencies of each gradient value in corresponding subset.

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