这些算子使用梯度和梯度的平均值来达到去噪和边沿检测，但忽略了增强图像边沿。
These operators make use of gradient and the mean value of the image gray to minimize noise effect, but ignore to harness the image edge.
接着，本文研究了含有中心贯穿裂纹和边沿贯穿裂纹 三维功能梯度板的断裂问题。
Then, the fracture problem of three dimensional FGM strips with center through cracks or edge through cracks is investigated.
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