MATLAB: The blocproc code works only for moon.tif. why

blockproc

i executed the code for blockproc given in mathworks.com it gets executed but when i used the same code for my own image that is stored in bin folder of MATLAB i get an error. why is that so.
 myfun = @(block_struct) ...
   uint8(mean2(block_struct.data)*...
   ones(size(block_struct.data)));
I2 = blockproc('FP.png',[32 32],myfun);
figure;
imshow('FP.png');
figure;
imshow(I2,[]);
??? Error using ==> blockproc>parse_inputs at 841
Invalid input image.  The input image to BLOCKPROC should be either a numeric matrix, a
string filename, or an ImageAdapter object.  See the documentation for BLOCKPROC for a
list of readable file formats and their extensions.  See the documentation for
ImageAdapter for information on making ImageAdapter objects.
Error in ==> blockproc at 215 input_args = parse_inputs(input_args,Input,block_size,fun,varargin{:});

Best Answer

Try this:
myfun = @(block_struct)...
uint8(mean2(block_struct.data)*ones(size(block_struct.data)));
I=imread('FP.png');
I2 = blockproc(I,[32 32],myfun);
figure;
imshow(I,[]);
figure;
imshow(I2,[]);
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