Re: any matlab function/source code for huffman encoding

"jdoms" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
>
> "walala" <[EMAIL PROTECTED]> schreef in bericht
> news:[EMAIL PROTECTED]
> > Dear all,
> >
> > I am looking for matlab source code for huffman encoding such as those
> used
> > in JPEG...
> >
> > I hate C code since I guess I need 10x more time to modify it to suit my
> > need; but with matlab code it is more understandable and modifiable...
> >
> > My need is to see a 16x16 picture block, if using Huffman encoding...
> needs
> > how many bits....(need accurate bit counting, and do not want get the
> > overhead of jpeg header file...)
> >
> > Please help me!
> >
> > Thanks a lot,
> >
> > -Walala
> >
>
> no matlab functions here,
>
> however if you only need to know how many bits it would take with huffman
> codes, then you should not really compress the file.
> All you need to know is how many bits are needed to encode each
(different)
> symbol.
> then the entire length of the encoded file (without headers, as you
wanted)
> is given by:
>
> Entire_Length = 0;
> for (int i=0;i<256 (1); i++){
>     Entire_Length += occurences[i] * bit_length[i];
> }
>
> in which:
> 1. bit_length[i] is the amount of bits needed to encode i;
> 2. occurences[i] is frequency of i;
>
> if you want to know how to get the amount of bits needed for a certain i,
> then i suggest using google ;-).
>
> jan
>

Hi, Jan,

Thank you for your answer!

I guess I can do what you talked about, but actually the ordinary Huffman
coding is a little different than that in JPEG... I want to know the exact
bits spended for a 8x8 block in a JPEG...

Do you have any idea how to do that?

Thanks a lot,

-Walala