英语翻译Step 4Once the edge direction is known,the next step is
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 falling in the blue range (67.5 to 112.5 degrees) is set to 90 degrees.And finally,any edge direction falling within the red range (112.5 to 157.5 degrees) is set to 135 degrees.
Step 5
After the edge directions are known,nonmaximum suppression now has to be applied.Nonmaximum suppression is used to trace along the edge in the edge direction and suppress any pixel value (sets it equal to 0) that is not considered to be an edge.This will give a thin line in the output image.
不要用机译，可以软件辅助，但要整理好并使用专业词汇，翻译好的话可以加分
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 falling in the blue range (67.5 to 112.5 degrees) is set to 90 degrees.And finally,any edge direction falling within the red range (112.5 to 157.5 degrees) is set to 135 degrees.
Step 5
After the edge directions are known,nonmaximum suppression now has to be applied.Nonmaximum suppression is used to trace along the edge in the edge direction and suppress any pixel value (sets it equal to 0) that is not considered to be an edge.This will give a thin line in the output image.
不要用机译，可以软件辅助，但要整理好并使用专业词汇，翻译好的话可以加分
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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,下一步就是让边缘方向与可以在一幅图像中跟踪的方向发生关系.So if the pixels of a 5x5 image are aligned as follows:因此,如果一幅5×5图像的像素被对准如下：
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).那么它就可以通过检视像素“a”被看到,当描述周围的像素时只有4个方向,即0度（在水平方向）、45度（沿正的方向）、90度（在垂直方向）、或135度（沿负的方向）.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).所以现在边缘方向必须根据其最接近的那个方向而被分解为上述4个方向之一（例如,如果发现方向角为3度,就使其成为0度）.Think of this as taking a semicircle and dividing it into 5 regions.把这看作是取一个半圆,并把它分为5个区域.
Therefore,any edge direction falling within the yellow range (0 to 22.5 & 157.5 to 180 degrees) is set to 0 degrees.因此,落入黄色范围（0到22.5和157.5到180度）的任何边缘方向被设定为0度.Any edge direction falling in the green range (22.5 to 67.5 degrees) is set to 45 degrees.落入绿色范围（22.5到67.5度）的任何边缘方向被设定为45度.Any edge direction falling in the blue range (67.5 to 112.5 degrees) is set to 90 degrees.落入蓝色范围（67.5到112.5度）的任何边缘方向被设定为90度.And finally,any edge direction falling within the red range (112.5 to 157.5 degrees) is set to 135 degrees.
而最后,落入红色范围（112.5到157.5度）的任何边缘方向被设定为135度
Step 5
第5步
After the edge directions are known,nonmaximum suppression now has to be applied.在边缘方向已知后,现在必须采用非最大值抑制.Nonmaximum suppression is used to trace along the edge in the edge direction and suppress any pixel value (sets it equal to 0) that is not considered to be an edge.非最大值抑制被用于在边缘方向上沿边缘跟踪,并抑制任何不被看作是边缘的任何像素值（设定其等于0）.This will give a thin line in the output image.
这将在输出的图像上给出一条细线.
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,下一步就是让边缘方向与可以在一幅图像中跟踪的方向发生关系.So if the pixels of a 5x5 image are aligned as follows:因此,如果一幅5×5图像的像素被对准如下：
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).那么它就可以通过检视像素“a”被看到,当描述周围的像素时只有4个方向,即0度（在水平方向）、45度（沿正的方向）、90度（在垂直方向）、或135度（沿负的方向）.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).所以现在边缘方向必须根据其最接近的那个方向而被分解为上述4个方向之一（例如,如果发现方向角为3度,就使其成为0度）.Think of this as taking a semicircle and dividing it into 5 regions.把这看作是取一个半圆,并把它分为5个区域.
Therefore,any edge direction falling within the yellow range (0 to 22.5 & 157.5 to 180 degrees) is set to 0 degrees.因此,落入黄色范围（0到22.5和157.5到180度）的任何边缘方向被设定为0度.Any edge direction falling in the green range (22.5 to 67.5 degrees) is set to 45 degrees.落入绿色范围（22.5到67.5度）的任何边缘方向被设定为45度.Any edge direction falling in the blue range (67.5 to 112.5 degrees) is set to 90 degrees.落入蓝色范围（67.5到112.5度）的任何边缘方向被设定为90度.And finally,any edge direction falling within the red range (112.5 to 157.5 degrees) is set to 135 degrees.
而最后,落入红色范围（112.5到157.5度）的任何边缘方向被设定为135度
Step 5
第5步
After the edge directions are known,nonmaximum suppression now has to be applied.在边缘方向已知后,现在必须采用非最大值抑制.Nonmaximum suppression is used to trace along the edge in the edge direction and suppress any pixel value (sets it equal to 0) that is not considered to be an edge.非最大值抑制被用于在边缘方向上沿边缘跟踪,并抑制任何不被看作是边缘的任何像素值（设定其等于0）.This will give a thin line in the output image.
这将在输出的图像上给出一条细线.
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