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感兴趣区域为什么不能小于目标区域？不是一个目标区域更大才能在其中识别更小的感兴趣区域吗？
roi参数应该比img小。 roi_x + roi_w < img_w and roi_y + roi_y < img_y
roi_x + roi_w < img_w and roi_y + roi_y < img_y