Rank: 380 based on 294 downloads (last 30 days) and 8 files submitted
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Francesco Pizzo

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SUN - Second University of Naples
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40.971367, 14.2045

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Files Posted by Francesco Pizzo View all
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(last 30 days)
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12 Sep 2012 Screenshot Watermark Project (Watermarking) An application that can be used to hide "ascii text" or "images" into another image using watermark Author: Francesco Pizzo image processing, communications, watermark, self_rating, gui, information encryptin... 100 9
  • 4.375
4.4 | 8 ratings
08 May 2011 Screenshot Simple exemples of 16QAM & BPSK modulators Two simple simulations in simulink on QAM & PSK modulators. Author: Francesco Pizzo simulation, signal processing, simulink, modulation, qam, psk 33 0
  • 1.0
1.0 | 1 rating
18 Mar 2011 Screenshot Simple Example of Simulated Annealing Optimization Example of developing a hybrid solution (Simulated Annealing + Pattern Search) for a case of study. Author: Francesco Pizzo optimization, simulated annealing, smes, pattern search, minimum 21 0
  • 5.0
5.0 | 1 rating
11 Nov 2010 Screenshot Simple Exemple of Arithmetic Coding It calculate the arithmetic code of a string of char, subject to an alphabet "A" Author: Francesco Pizzo mathematics, communications, coding 12 0
  • 5.0
5.0 | 1 rating
10 Nov 2010 Exemple of Lempel Ziv Coding A function that codes a string of chars with Lempel Ziv coding Author: Francesco Pizzo communications, mathematics, zip, file compression 26 6
  • 5.0
5.0 | 4 ratings
Comments and Ratings by Francesco Pizzo View all
Updated File Comments Rating
02 Sep 2013 Watermark Project (Watermarking) An application that can be used to hide "ascii text" or "images" into another image using watermark Author: Francesco Pizzo

@Eric you are right! If you read the algorithm details it's clear that the image must remain unmodified after that a watermark is applied. This is just a simple example and it's obvious that if you need also robustness you should hide the information in another way (for example using a bi-dimensional cosine transformation) ;)

03 Mar 2013 Exemple of Lempel Ziv Coding A function that codes a string of chars with Lempel Ziv coding Author: Francesco Pizzo

what do you mean with "main program"?

13 Feb 2013 Watermark Project (Watermarking) An application that can be used to hide "ascii text" or "images" into another image using watermark Author: Francesco Pizzo

@kostas Matlab 7.7 or grater

@Abra_dog it's a steganographic watermarking (the information is kept secret)

04 Nov 2012 Image processing laboratory An application with an intuitive GUI that you can use for some image processing exercises. Author: Francesco Pizzo

I have tried with tif images and it works. Maybe your error it is due to the matlab version, which version do you use?
Remember that to run the application it is necessary to type "img_lab" into the command line ;)

03 Apr 2012 Image processing laboratory An application with an intuitive GUI that you can use for some image processing exercises. Author: Francesco Pizzo

thank you for rating :)

Comments and Ratings on Francesco Pizzo's Files View all
Updated File Comment by Comments Rating
19 Dec 2014 Image processing laboratory An application with an intuitive GUI that you can use for some image processing exercises. Author: Francesco Pizzo Manimozhi Iyer

pls provide clear idea about ray tracing methods in image processing in Matlab 7 versions

10 Nov 2014 Watermark Project (Watermarking) An application that can be used to hide "ascii text" or "images" into another image using watermark Author: Francesco Pizzo Pratiksha M N

Time Complexity has to be reduced.

07 Aug 2014 Exemple of Lempel Ziv Coding A function that codes a string of chars with Lempel Ziv coding Author: Francesco Pizzo Johan elbarba

Sorry I wasn't thinking in my last comment.
For the decoder, this is how I solved it now:
The receiver gets the initializing dictionary (basically unique(original input)) and the compressed data (indices from the dictionary created when we compressed the original data). The first indices will be found in the initializing dictionary. For each value inserted into the decoded data we add the value inserted together with the next value to the recreated dictionary. If that next dictionary entry does not yet exist then we add the previous element to the dictionary again.
This might sound confusing but it was how I solved it.
Regards

05 Jun 2014 Exemple of Lempel Ziv Coding A function that codes a string of chars with Lempel Ziv coding Author: Francesco Pizzo Johan elbarba

Works pretty good. I don't get the function of the 0:s that the function puts into the encoded data.
For a decoder make an extra output of the codebook. Then you can decode by simply:

tobedecoded=codedec(codedec~=0);
decodeddata=cell2mat(codebook(tobedecoded))';

02 May 2014 Exemple of Lempel Ziv Coding A function that codes a string of chars with Lempel Ziv coding Author: Francesco Pizzo Zain

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