中文说明：能够实现对棋盘格标定模版的焦点提取，简单实用
English Description：
It can realize the focus extraction of chessboard calibration template, which is simple and practical
Focus extraction of chessboard calibration template is realized
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中文说明：能够实现对棋盘格标定模版的焦点提取，简单实用
English Description：
It can realize the focus extraction of chessboard calibration template, which is simple and practical