题目

英语翻译
Step 4
Once the edge direction is known,the next step is to relate the edge direction to a direction that can be traced in an image.So if the pixels of a 5x5 image are aligned as follows:
Then,it can be seen by looking at pixel "a",there are only four possible directions when describing the surrounding pixels - 0 degrees (in the horizontal direction),45 degrees (along the positive diagonal),90 degrees (in the vertical direction),or 135 degrees (along the negative diagonal).So now the edge orientation has to be resolved into one of these four directions depending on which direction it is closest to (e.g.if the orientation angle is found to be 3 degrees,make it zero degrees).Think of this as taking a semicircle and dividing it into 5 regions.
Therefore,any edge direction falling within the yellow range (0 to 22.5 & 157.5 to 180 degrees) is set to 0 degrees.Any edge direction falling in the green range (22.5 to 67.5 degrees) is set to 45 degrees.Any edge direction fal

提问时间：2020-10-11

答案

已有两个帖子被楼主采纳,请继续审阅.Step 4 第4步Once the edge direction is known,the next step is to relate the edge direction to a direction that can be traced in an image.一旦边缘的方向已知,下一步就是...