求翻译：由上式可知，梯度均值的近似值与相邻像素点的灰度差成正比，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 and the adjacent pixel gray proportional to the difference, ie, gradient mean can be approximated to show the degree of intensity change of the adjacent image area, the edge of the region and the edge clarity. Each adjacent image area,

We know that by-gradient approximation of value to the adjacent pixels of the grayscale gradient is directly proportional to approximate values can be expressed in the adjacent area of the image of the gray changes, that is the edge of the region and the clarity of edge. The adjacent area of the ima

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From the top, gradient approximation of the value of adjacent pixels is proportional to the difference of gray, 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 amplitude s

May know by the above equation, the gradient average value approximate value and the neighboring picture 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 m