how to get dct co-efficients of a compressed image

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Muthuraj V
Muthuraj V 2011-10-21
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
Wayne King 2011-10-21
Please read the documentation for dct2
>>doc dct2
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Muthuraj V
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
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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