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1、棋盘表面非纯色或色彩复杂时不一定可以检测到底部顶点:
2、其他地方出现了和棋盘一样的颜色可能会误导底部顶点位置的判断:
也许后面微信会把棋盘表面弄个更加复杂,像素检测的方式基本行不通了。
3、对于已经出现中心点提示的,可以指定定位到这里,避免不必要的检测: