求翻译：由上式可知，梯度均值的近似值与相邻像元点的灰度差成正比，即梯度均值可以近似地表示出该相邻图像区域的灰度变化程度，也即该区域的边缘的多少及边缘的清晰程度。将各个相邻图像区域的平均梯度幅值求和，则可表征整幅图像的对比度。是什么意思？

From the above equation, the gradient approximation of the mean of neighboring pixels Yuan point of the gray scale proportional to the difference, ie, gradient mean can be approximated to show the degree of intensity change of the adjacent image area, ie the edge of the region and the the clarity of

We know that by-gradient approximation of value to the adjacent points of $a grayscale gradient is directly proportional to the average of the values can be similar to that of the adjacent area of the image gray extent of the changes, that is the edge of the region and the clarity of edge. The adjac

May know by the above equation, the gradient average value approximate value and the neighboring element gradation difference is proportional, namely the gradient average value may approximately express this neighboring image region gradation change degree, also namely this region edge how many and

From the top, gradient approximation of mean adjacent-pixel gray level is proportional to the difference of, namely gradient value can approximate representation of the gray-scale variability of adjacent image area, that is, how much of the edge of the area and edge clarity. Average gradient amplitu

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