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我想使用 openCv 计算每个包含字母的框的坐标。然后我将裁剪每个框并将其保存在 ocr 的新图像中。在 cvSetImageROI 函数中,使用参数 CvRect 指定框的坐标,但在我的情况下,我必须找到它。请帮助我