Select a site similar to a circular black and white pictures, run after A black pixels, B for border pixels, 4* 3.14* A/(B* B) that is circular degrees, this value is more close to 1, note more like a round, such as the 0.7 deviation from the one that has not a circular

Packet : 103244817yu.rar filelist
yu\c018.jpg
yu\yuan.rar
yu

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