how to get dct co-efficients of a compressed image

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Muthuraj V 2011-10-21

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Hi all, am a student of M.tech doing a project on image processing in Matlab, my project is doing different operations on compressed image directly. so in order to do tat 1st i want to know "how to get DCT co-efficients of an compressed image"

please help me in finding the same...

Thank you, Raj,

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Wayne King 2011-10-21

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Please read the documentation for dct2

>>doc dct2

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Muthuraj V 2011-10-24

Thank for the information,

but i wanted to get the DCT coefficients of an image in compressed domain i.e without compressing it.

can u please check with that.

Thank You

Walter Roberson 2011-10-24

If you have an existing JPEG image and you want to retrieve the stored DCT coefficients, then you will need to study the JPEG file format and write a routine to pull them out of the JPEG file.

You might be able to find an existing routine that could be adapted for your purposes in the MATLAB File Exchange.

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