How can in find minimum gradient path with respect to the reference point in a text image?

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user06 2019-7-5

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https://ww2.mathworks.cn/matlabcentral/answers/470376-how-can-in-find-minimum-gradient-path-with-respect-to-the-reference-point-in-a-text-image

编辑： Matt J 2019-7-5

c-001-06.jpg

I have a signature image. I managed to find the starting point of the image. Now i want to trace all the points of the signature in a connected manner and find the distance of each point from the refernce point. Firstly i have skeletonize the image and performed the operations using 3*3 window it is take lots of time and the results are also not perfect. please suggest the methods how can i do this in matlab. I thought of applying minimum gradient but not able to figure out how can i apply this. I have attatched the signature image along with the question.

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Matt J 2019-7-5

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编辑：Matt J 2019-7-5

You can use bwskel or bwmorph('thin',...) to do the skeletonization. If you are already using this, I don't know why it would be slow, but on the other hand, I don't know what you consider fast. Also, bwmorph supports gpuArrays, so if you have the Parallel Computing Toolbox, that could be used to gain extra speed.

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user06 2019-7-5

i will store those points for backtracking. this is what i think. if you hav any better alternative then please suggest me.

Matt J 2019-7-5

编辑：Matt J 2019-7-5

在 MATLAB Online 中打开

Well, here's a good place to start, I think:

C=bwboundaries(skeleton);
for i=1:numel(C)
    
    C{i}=unique(C{i},'stable','rows');
    
end

This will give the pixels of the skeleton in some neighbor-to-neighbor ordering chosen by the software. You can see if this ordering is adjustable to your needs.

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