Why the imfilter give different result with textbook?
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Yode
le 23 Juil 2017
Commenté : Walter Roberson
le 23 Juil 2017
As the textbook say,this code ( gd=imfilter(f,w)) will give a result with blurry edge like follow
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/166245/image.png)
But actually I will get a result :
w=ones(31);
gd=imfilter(f,w);
imshow(gd)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/166246/image.png)
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Image Analyst
le 23 Juil 2017
Because you did not divide by 31^2 the image gets clipped to 256 instead of having much, much greater values. If you want to see it blurred, either convert to double (but the blurred image will be in a much brighter intensity range than the original), or divide your kernel by 31^2:
windowWidth = 31;
w = ones(windowWidth) / windowWidth ^ 2;
gd = imfilter(grayImage, w);
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Walter Roberson
le 23 Juil 2017
Also notice that they used imshow(gd, []) but you used imshow(gd) without the []
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