求翻译：根据罗伯特梯度法，设(i,j)是 窗口中心像素点，则可用e(i,j)表示其4邻域平均梯度幅值（简称梯度均值），其近似计算公式如下是什么意思？

According to Robert gradient method, the set (i, j) pixel of the window center, you can use the e (i, j) said its four neighborhood average gradient amplitude (referred to as the gradient of the mean), its approximate calculation formula is as follows

In accordance with law, Robert gradients (i, j) is a center of the window, the pixels available E (I, J) indicates that the 4 neighborhood average gradient amplitude gradient (value) and their approximate formula is as follows

According to the Robert gradient method, supposes (i, j) is in the window the image picture element, then available e(i, j) expressed its 4 neighborhood average gradient peak-to-peak value (i.e. gradient average value), its approximate calculation formula is as follows

According to Robert gradient method, set (i,j) is centered in the window pixel, you can e (i,j) expressed its amplitude 4 neighborhood with an average gradient (gradient value for short), the approximate calculation formula is as follows

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