How can I split the image into blocks and then extract the features from each block?

Hello

I extracts image features (invariant moment) using this code

 [filename, pathname] = uigetfile({'*.*';'*.bmp';'*.jpg';'*.gif'}, 'Pick a Degraded Fingerprint Image File');
 im = imread([pathname,filename]);
 figure, imshow(im);title('Fingerprint Image');
 n1=invmoments(im);

How can I split the image into blocks(every block like 32x32) and then extract the features from each block?

Answer 1

[Image Analyst]

See the FAQ: https://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F

[wisam kh]

Thank you

Answer 2

[Yuvaraj Venkataswamy]

 if true
    mat2cell(I,size(I,1)/32*ones(32,1), size(I,2)/32*ones(32,1), 3)
  end

This will split an image into 32 x 32 blocks. Then you can extract image features from each blocks using for loop.

[wisam kh]

thank you

 [filename, pathname] = uigetfile({'*.*';'*.bmp';'*.jpg';'*.gif'}, 'Pick a Degraded Fingerprint Image File');
 im = imread([pathname,filename]);

 if true
    mat2cell(im,size(im,1)/32*ones(32,1), size(im,2)/32*ones(32,1), 3)
  end

give me this error

Error using mat2cell (line 80)

Number of input vector arguments, 3, does not match the input matrix's number of dimensions, 2.

[Yuvaraj Venkataswamy]

@wisam kh Try this,

 mat2cell(I,size(I,1)/4*ones(4,1), size(I,2)/4*ones(4,1), 3)

[wisam kh]

@Yuvaraj V

Sorry to bother you, but the same error appears.

By the way the picture type is grayscale

[Yuvaraj Venkataswamy]

Check this,

https://in.mathworks.com/matlabcentral/answers/223978-how-to-divide-an-image-into-blocks

[wisam kh]

Thank you for this interaction

[Yuvaraj Venkataswamy]

You are welcome.