can any one help me to implement this matlab code

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Pamela Paolo
Pamela Paolo 2012-10-24
编辑： Walter Roberson 2017-12-28
Hi,
I need your help please to implement a matlab code for Edge drawing Edge Drawing works on grayscale images and is comprised of 4 steps:
(1) Suppression of noise by Gaussian filtering,
(2) Computation of the gradient magnitude and edge direction maps,
(3) Extraction of the anchors (peaks of the gradient map),
(4) Linking of the anchors by smart routing to compute the final edge map.
This is a link that can explain the method.
http://ceng.anadolu.edu.tr/CV/EdgeDrawing/
thanks
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Pamela Paolo
Pamela Paolo 2012-10-25
编辑：Walter Roberson 2017-12-28
thanks for your reply
I=imread('image.png');
figure;imshow(I);
I2=rgb2gray(I);
figure;imshow(I2);
H = fspecial('gaussian');
I3 = imfilter(I2,H,'replicate');
figure;imshow(I3);
I3 = single(I3)
imgrad = gradient(I3);
figure;imshow(imgrad);
But i have this result
with this image
Thien Thu Ngo
Thien Thu Ngo 2017-12-28
Hi @Pamela Paolo , could you please share with me the C++ code of this paper? Thanks a lot.

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回答（2 个）

Pamela Paolo
Pamela Paolo 2012-10-25
What is the purpose of casting I3 to single?? becuse i haven't a good result of gradient
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Image Analyst
Image Analyst 2012-10-26
I haven't run your code but when it says " Integers can only be combined with integers of the same class, or scalar doubles." it means that it's trying to do something with your integer array, like combine it somehow with a single or double array, and that is against MATLAB's rules. There is no such rule with singles and doubles combining with each other so that's why I said to cast it to single.
Pamela Paolo
Pamela Paolo 2012-10-26
编辑：Pamela Paolo 2012-10-26
Thanks for your reply
Have you an idea about the programming of these steps with matlab:
-edge direction maps
-extraction of the anchors
-linking of the anchors by smart routing to compute the final edge map.

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Pamela Paolo
Pamela Paolo 2012-10-29
Hi
To find the gradient can i use
serl=[1 1 1,1 1 1, 1 1 1 ];
image1=imdilate(I3,serl);
image2=imerode(I3,serl);
grad=image1-image2;
what are the matlab functions used to program these steps:
-edge direction maps
-extraction of the anchors
-linking of the anchors by smart routing to compute the final edge map.
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Pamela Paolo
Pamela Paolo 2012-10-31
Hello
I have only this link http://ceng.anadolu.edu.tr/CV/EdgeDrawing/. I haven't more details. That is why I asked the question. thanks
I=imread('image.png');
figure;imshow(I);
I2=rgb2gray(I);
figure;imshow(I2);
H = fspecial('gaussian');
I3 = imfilter(I2,H,'replicate');
figure;imshow(I3);
I3 = single(I3)
imgrad = gradient(I3);
figure;imshow(imgrad);
Pamela Paolo
Pamela Paolo 2012-11-1
Hello,
I need your help to understand these steps
-Computation of the gradient magnitude and edge direction maps,
-Extraction of the anchors (peaks of the gradient map),
-Linking of the anchors by smart routing to compute the final edge map.
It's correct to do this to compute the gradient magnitude and edge direction maps?
[Gmag,Gdir] = imgradient(I3)

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