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    which is the best entropy coding method for wavelet ac coefficients

    which is the best entropy coding method for wavelet ac coefficients ?Is it huffman,arithmetic or run length encoding?

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    Re: which is the best entropy coding method for wavelet ac coefficients

    Quote Originally Posted by tojeena View Post
    which is the best entropy coding method for wavelet ac coefficients ?Is it huffman,arithmetic or run length encoding?
    Hi tojeena, I suggest huffman encoding is better than the other two unfortunately if you have to encode a long run of symbol then obviously you have to choose run length encoding technique...

    Hope it may be Helpful to you...

    others correct me if I am wrong...



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    Re: which is the best entropy coding method for wavelet ac coefficients

    Thank u fr ur reply...but arithmetic coding is used in SPIHT...



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    Re: which is the best entropy coding method for wavelet ac coefficients

    Quote Originally Posted by tojeena View Post
    Thank u fr ur reply...but arithmetic coding is used in SPIHT...
    Hi tojeena i will say some disadvantages of arithmetic coding

    1)whole codeword must be received to start decoding the symbols.
    2) if a bit is corrupt in code word means the whole message will be corrupted.
    3) the precision in the limit will limit to the number of encoding in an code word.

    if above mentioned are not constrained to you then arithmetic code can be used...
    Hope this may be helpful....

    Others correct me if I am wrong...



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    Re: which is the best entropy coding method for wavelet ac coefficients

    Will this disadvantage matters for image?



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    Re: which is the best entropy coding method for wavelet ac coefficients

    Quote Originally Posted by tojeena View Post
    Will this disadvantage matters for image?
    Hi tojeena,

    It is based on image,

    if it is medical then 2nd demerit matters a lot .
    if it is defense image then 3rd demerit matters a lot .

    Hope it may be Helpful to you...

    others correct me if I am wrong....



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    Re: which is the best entropy coding method for wavelet ac coefficients

    Oh..i am using satellite image.are you sure about this?When compared to huffman arithmetic coding is slower,thats what i know...

    Thankyou..



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    Re: which is the best entropy coding method for wavelet ac coefficients

    ya i am sure, well based on your requirements choose the coding techniques...

    all the best...



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    Re: which is the best entropy coding method for wavelet ac coefficients

    I thought of using it because SPIHT compression is making use of arithmetic coding.Confused.


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    Re: which is the best entropy coding method for wavelet ac coefficients

    Quote Originally Posted by tojeena View Post
    I thought of using it because SPIHT compression is making use of arithmetic coding.Confused.
    why cant you try with some other compression algorithm...
    if you are interest you just send me the base paper of your project to me and i can suggest you some algorithm if possible...



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    Re: which is the best entropy coding method for wavelet ac coefficients

    http://public.ccsds.org/publications...1165_final.pdf. This is my base paper.They have mentioned any variable length coding,.

    Thank you.

    - - - Updated - - -

    It is given in page.4



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    Re: which is the best entropy coding method for wavelet ac coefficients

    Hi toojeena, I have gone through your Paper. I suggest you to refer this link http://www.mathworks.in/matlabcentra...watching=22552 for the types of coding techniques for Sphit algorithm...

    For easy going you first develop the compression process of your base paper in simulink model so that you can adjust the parameter easily and find the performance of the different types of algorithm and coding techniques...instead of writing a code for long period...

    then, You split the proposed algorithm in to different phase and write a code so that you can easily get through the error....
    NOTE: Before choosing the algorithm you should be very clear with the CCSDS Requirements of Image compression

    all the best....
    Hope this may be helpful to you...



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