how can i solve problem in my code for adaptive median filter

Question

Daleel Ahmed 2017-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/363833-how-can-i-solve-problem-in-my-code-for-adaptive-median-filter

回答： Zeeshan Salam 2019-3-24

function f= dd(r,Smax)
if (Smax <= 1) | (Smax/2 == round(Smax/2)) | (Smax ~= round(Smax))
   error('SMAX must be an odd integer > 1.')
end
[M, N] = size(r);
% Initial setup.
f = r;
f(:) = 0;
alreadyProcessed = false(size(r));
%Begin filtering.
for k = 3:2:Smax
   zmin = ordfilt2(r, 1, ones(k, k), 'symmetric');
   zmax = ordfilt2(r, k * k, ones(k, k), 'symmetric');
   zmed = medfilt2(r, [k k], 'symmetric');
     processUsingLevelB = (zmed > zmin) & (zmax > zmed) & ...
         ~alreadyProcessed; 
     zB = (r > zmin) & (zmax > r);
     outputZxy  = processUsingLevelB & zB;
     outputZmed = processUsingLevelB & ~zB;
     f(outputZxy) = r(outputZxy);
     f(outputZmed) = zmed(outputZmed);
     alreadyProcessed = alreadyProcessed | processUsingLevelB;
     if all(alreadyProcessed(:))
        break;
     end
  end
% Output zmed for any remaining unprocessed pixels. Note that this
% zmed was computed using a window of size Smax-by-Smax, which is
% the final value of k in the loop.
f(~alreadyProcessed) = zmed(~alreadyProcessed);

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Daleel Ahmed 2017-10-28

编辑：Walter Roberson 2017-10-28

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Error using ordfilt2
Expected input number 1, A, to be one of these types:
double, single, uint8, uint16, uint32, uint64, int8, int16, int32, int64, logical
Instead its type was char.

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Answer 1

Walter Roberson 2017-10-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/363833-how-can-i-solve-problem-in-my-code-for-adaptive-median-filter#answer_288290

You appear to be attempting to pass in characters for the first input to your function, the one named "r" here. That input must be numeric for this code to work.