can any one help me to implement this matlab code

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Pamela Paolo 2012-10-24

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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 2012-10-25

编辑：Walter Roberson 2017-12-28

在 MATLAB Online 中打开

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 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 2012-10-25

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What is the purpose of casting I3 to single?? becuse i haven't a good result of gradient

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 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 2012-10-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/51760-can-any-one-help-me-to-implement-this-matlab-code#answer_63662

在 MATLAB Online 中打开

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 2012-10-31

在 MATLAB Online 中打开

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);