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entropy encoding for images

Asked by FIR on 24 Dec 2012

is there any source codes available for entropy encoding for images, please help

2 Comments

Walter Roberson on 24 Dec 2012

What difficulty are you having with the code version of it that you wrote?

FIR on 25 Dec 2012

I am using 2010a version

code is

 [dict,avglen] = huffmandict(symbols,p) 
 comp = huffmanenco(img,dict);

but taking long time to run and crashes out

FIR

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2 Answers

Answer by Image Analyst on 24 Dec 2012

8 Comments

FIR on 25 Dec 2012

is there any codes available for shanon fano encoding

Walter Roberson on 25 Dec 2012

what does

length(count)

show? And also

sum(count <= 0)

?

FIR on 25 Dec 2012

length(count)

ans =

   238

>> sum(count <= 0)

ans =

     8
Image Analyst
Answer by Walter Roberson on 25 Dec 2012
Edited by Walter Roberson on 25 Dec 2012

http://www.mathworks.com/help/stats/tabulate.html

If x is a numeric array, TABLE is a numeric matrix. If the elements of x are nonnegative integers, TABLE includes 0 counts for integers between 1 and max(x) that do not appear in x.

But you already read the documentation so you already knew that, so somehow you must have gotten some negative counts. What does

count(counts <= 0)

show, and what does class(count) show?

10 Comments

FIR on 25 Dec 2012

No walter i could not findout,so walter is there any codes for shanon fanon

FIR on 25 Dec 2012
after deleting zeros i get error 
Error using ==> arithenco at 36
The symbol sequence parameter can take values only between 1 and the length of the
symbol counts parameter.
Error in ==> sample6 at 79
code=arithenco(seq,count);
Walter Roberson on 25 Dec 2012

Sorry, Google doesn't seem to be accessible to me tonight. Perhaps you could try it from your end?

Walter Roberson

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