MATLAB: How to divide image into 16 block

image segmentation

hello,

i want help in the implementation of divide image into block ?

thanks

Best Answer

Have you checked im2col()?

Let's say you want to divide your image into blocks of size M,N then something like this should work:

B = im2col(inputImage,[m n],'distinct');

since you want 16 blocks, so pretty much 4x4 blocks then

m=ceil(size(inputImage,1)/4)
n=ceil(size(inputImage,2)/4)

However, I have to ask you a question. Are you sure that it is necessary to divide your image into blocks? I would look into blockproc() and see if I can use that before dividing the image into blocks.

Related Solutions

MATLAB: How to divide gray scale image into 8×8 blocks and access each block separately to apply dct2 on the block

file = 'cameraman.tif';
im=imread(file);
imshow(im);

In order to use blockproc you have to use a function that accpts blocksstructure, that's why you need to use something like this

imModified = blockproc(im,[8 8],@(blkStruct) dct2(blkStruct.data));
imshow(imModified)

I hope this answers your question

MATLAB: IMAGE SEPARATION INTO BLOCKS

Dear as in obove code division is n't correct .. follow this code

let say your image is I of 256 x 256. Make your your grid which is 4 x 4 this time should divide image dimensions.

if size(I,3)>1, I = rgb2gray(I); end % to make sure image is grayscale
I = imresize(I, [256 256]); % you can keep it the size you want but should be divisible by 4 x 4.
img_blocks = mat2cell(I,size(I,1)/4*ones(1,4), size(I,2)/4*ones(1,4));

Then you get img_blocks of size 4x4. For first block you can get

part1 = img_blocks{1,1};

Best Answer

Related Solutions

MATLAB: How to divide gray scale image into 8×8 blocks and access each block separately to apply dct2 on the block

MATLAB: IMAGE SEPARATION INTO BLOCKS

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