1.To convolute a image with a filer ,a good way to cut down the magnitude.
![](https://img.haomeiwen.com/i5663335/230ad92b2a92987c.png)
QS:Is any matrix can be get by the convolution with two vectors?
2.Devison can be a linear function when the denominator is a constant.
3.Three ways about the boundary issues.
![](https://img.haomeiwen.com/i5663335/7f7d88ee6b18e6db.png)
And matlab code are listed below:
![](https://img.haomeiwen.com/i5663335/094ddf99378a1cb4.png)
4.Sharping filter
![](https://img.haomeiwen.com/i5663335/ade5a7574a18b780.png)
5 Median filter to remove the salt and pepper noise,and be noticed that it is not a linear filter
![](https://img.haomeiwen.com/i5663335/88a7ac0ab1c29f66.png)
6.In order to avoid bluring the nice sharp in the sec box,median filter
![](https://img.haomeiwen.com/i5663335/d76df1a9185b1c07.png)
and the code is here:
![](https://img.haomeiwen.com/i5663335/a3c16b90e6dbec43.png)
cite:
https://classroom.udacity.com/courses/ud810/lessons/3490398568/concepts/34996085510923
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