由于画像与照片的产生机理和信息表达方式不同，两者之间存在较大的几何形变及纹理和灰度差异，若直接采用画像与照片之间的匹配程度进行识别势必产生很大误差。

Due to large differences between a photo-sketch pair caused by different generation mechanism and information expression manner, it is impossible to recognize by simply matching the photo-sketch pair.

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