how to divide an image into overlapping blocks using DCT

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tawheed jan 2017-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/323546-how-to-divide-an-image-into-overlapping-blocks-using-dct

回答： Image Analyst 2017-2-6

I have 512x512 pixels image and i want to divide the image into overlapping blocks and after that i want to extract features in order to perform the image forgery detection.

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Answer 1

Image Analyst 2017-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/323546-how-to-divide-an-image-into-overlapping-blocks-using-dct#answer_253515

See the FAQ for how to get NON-overlapping blocks. http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F Note: DCT is not used nor needed to specify a block/tile/subimage of a larger image. You can make changes to blockproc() if you want the blocks to overlap instead of move in "jumps" of the window size. Or you can use conv2(), imfilter(), or nlfilter() if you want the block to slide over only one pixel at a time regardless of what the block width is.