How to update the value of next pixel in chain code?

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Ekta Sharma 2016-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/271393-how-to-update-the-value-of-next-pixel-in-chain-code

关闭： MATLAB Answer Bot 2021-8-20

I am getting first non zero pixel and its chain code but then i need to go to next pixel depending upon that direction.How I can proceed further? Thanks in advance.

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Walter Roberson 2016-3-4

There is code for Freeman chain in the File Exchange

Ekta Sharma 2016-3-6

Yes Sir...You are right.Code is available but I am unable to understand it.How to provide input to the function?

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Answer 1

Walter Roberson 2016-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/271393-how-to-update-the-value-of-next-pixel-in-chain-code#answer_212553

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Use bwboundaries to extract boundaries. The first output of it will be a cell array, one entry for each region found. Pass the contents of each entry in the cell array to the chaincode routine at http://www.mathworks.com/matlabcentral/fileexchange/29518-freeman-chain-code

B = bwboundaries(YourImage);
numregions = length(B);
chains = cell(numregions,1);
for blobnum = 1 : numregions
   chains{blobnum} = chaincode(B{blobnum});
end