求翻译：假设图像的灰度级为L，那么相应的像素邻域中值和梯度均值的灰度级也为L，可以把f(i,j)、g(i,j)、e(i,j)组成的三元组(i,j,k)定义为三维直方图，是什么意思？

Assume that the image gray level l, the corresponding pixel neighborhood value and the gradient of the mean gray level 1, f (i, j), g (i, j), e (i, j) consisting of triples (i, j, k) is defined as a three-dimensional histogram,

Assume that the image is Grayscale, L corresponding pixel neighborhood values in the Value and gradient as well as grayscale L to F (I, J), G (i, j) and E (i, j) of the $3 group (i, j, k) is defined as 3D histogram.

The supposition image gradation level is L, then in the corresponding picture element neighborhood the value and the gradient average value gradation level also is L, may f(i, j), g(i, j), e(i, j) composition three tuple (i, j, k) define as the three dimensional histogram,

Hypothesis of gray-level image of l, then the corresponding pixel value in the neighborhood and gradient of gray level value for l, f (i,j), g (i,j), e (i,j), triples (i,j,k) is defined as the three dimensional histograms,

正在翻译，请等待...