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Thread: Discrete Cosine transform(dct)

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    Default Discrete Cosine transform(dct)

    The algorithm to perform discrete cosine transform is
    break image into 8*8 block of pixels
    from left to right top to bottom subtract 128 from each block of pixels
    apply dct to each block
    ..
    the algorithm continues however I have a few questions
    1)how to break the image into 8*8 block of pixels.What is the meaning of this statement and how should i proceed about doing it?
    2)subtract 128 from what value?
    3)how to apply dct?
    Thank you
    Last edited by skillet; April 8th, 2012 at 01:09 AM.


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