Error is getting when median filter is applied to dicom images. The code i am tried is here

info=dicominfo(filenames{1});
X = zeros([info.Height info.Width info.SamplesPerPixel file_num],'uint16');
for y = 1:file_num
    thisinfo=dicominfo(filenames{y});
    if thisinfo.Height~=info.Height||thisinfo.Width~=info.Width
       error('%s does not have the expected height or width',filenames{y})
    elseif thisinfo.SamplesPerPixel~=info.SamplesPerPixel
        error('%s does not have the expected number of channels',filenames{y})
    elseif isfield(thisinfo,'NumberOfFrames') && thisinfo.NumberOfFrames>1
        error('%s is a multiframe image',filenames{y})
    end
[rows, columns, numberOfColorChannels] = size(filenames);
if numberOfColorChannels > 1
      Igray = rgb2gray(filenames);
else
    Igray = filenames;
end    
     X(:,:,:,y) = im2uint16(dicomread(Igray{y}));
     g = im2double(Igray); 
     m = medfilt2(g);
 end

And the errors i am getting is Error using im2double Expected input number 1, Image, to be one of these types:

double, logical, uint8, uint16, int16, single

Error in im2double (line 36)

validateattributes(img,{'double','logical','uint8','uint16','int16','single'},{}, ...

Pls help me to apply image filters. Any help is appreciated

Error using im2double

Expected input number 1, Image, to be one of these types:

double, logical, uint8, uint16, int16, single

Error in im2double (line 36)

validateattributes(img,{'double','logical','uint8','uint16','int16','single'},{}, ...

Answer 1

[Jan]

This looks, like filename is a cell string, containing file names:

info=dicominfo(filenames{1});

Then getting the sizes of the cell array is strange:

[rows, columns, numberOfColorChannels] = size(filenames);

I assume, the size of filenames is [1,1] or maybe a vector. But it is unlikely, that the list of file names has 3 dimensions. I assume, you do not mean the name of the files, but the contents of an imported file - maybe:

img = dicomread(filenames{1});
[rows, columns, numberOfColorChannels] = size(img);

The same applies for

    Igray = rgb2gray(filenames);  % Converting the name of the file?!?
else
    Igray = filenames;
end    
X(:,:,:,y) = im2uint16(dicomread(Igray{y}));  % Fine: import the contents!