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对着电脑照为什会将我的屏幕识别成圆？
https://book.openmv.cc/example/09-Feature-Detection/find-circles.html
更改一下threshold参数
如果我将threshold的增大了，检测到的圆是少了，但同时找圆的时间也长了，如果我摄像头稍微晃动，就找不到圆了，但我需要一直有圆的坐标值返回
