In allusion to this question, in this paper, we proposed a method of image filter based on direction gradient.

针对这一问题，本文提出了一种基于方向梯度的图像滤波算法。

youdao

This paper presents a new adaptive multilevel median filter based on direction information measure to solve the contradiction between noise attenuation and image details-preserving (edge-preserving).

针对图像滤噪中滤除噪声和保护细节(边缘)的矛盾，本文提出一种新的基于方向信息测度的自适应多级中值滤波器。

youdao

I couldn't find a setting within the filter to change the direction of the fibers, so I created each part of the frame in a separate document, and then placed them into the original chalkboard image.

我无法找到一个确定的过滤器改变方向的纤维，所以我创建的每个部分内的另一份文件，然后把它们变成原来的黑板形象。

youdao