求翻译：是因为图像预处理后的矩形区域保留了少量背景，使得该特征不能成为对分类显著影响的主要因素，取而代之的是描述图像边缘信息的梯度均方差。是什么意思？

Because the rectangular area in the image pre-processing to retain a small amount of background, making this feature can not be a major factor in a significant impact on the classification, replaced by a description of the gradient of the image edge information mean square error.

That is that the image pre-processing of the rectangular region has retained a small background, so that the features could not be the classification of the major factors significantly impact and replaced by a description of the edges of the image gradient information.

After is because the image pretreatment rectangular region retained the few backgrounds, enables this characteristic to become to classifies the remarkable influence the primary factor, displaces describes the image edge information gradient mean-square deviation.

Is because the rectangular area of the image after preprocessing has retained a small amount of background, making classification significantly affect the features cannot be the main factor, instead describes the edges of the image gradient information is the variance.

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