Compression

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Compression

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DSP opcode decompression on a microcontroller.

Hi all,Let me first introduce myself. My name is Ken Helberg and I've beenreading this newsgroup for over a year simply out of a general interestin compression; learning what I can when it interests me. With mylimited knowledge, I have little to add to various discussions thatoccur in this...

2 answers | 3593 bytes |

JPEG problems :p part2

Hi,As I've introduced my self previously here on comp.compression, the one'swho've read it, know that I'm busy writing a JPEG decoder.I want you to take a look at the following images. The first one is theinput jpeg image and the second one is the output I get in a .bmp file....

3 answers | 837 bytes |

JPEG decompression library

Hi,Can anyone recommend a library for decompressing JPEGs, please? I currentlyuse the Independent JPEG Group's library in an application that receieves astream of JPEGs and displays the "video" in a window. I know it's not asefficient as it can be, because another application for which...

5 answers | 644 bytes |

Call for Papers: SAM'06 (part of WORLDCOMP'06)

From: Dr. H. R. ArabniaC A L L F R P A P E R SThe 2006 International Conference onSecurity & Management(SAM'06)June 26-29, 2006Monte Carlo Resort, Las Vegas, Nevada, USAThe 2006 International Conference on Security & Management(SAM'06) will be held in Las Vegas, Nevada, June 26-29, 200...

4 answers | 10038 bytes |

About LHA file format

Mikael Salson wrote:I have some problems to understand how the files are compressed inLHA files. I know that both LZSS and Huffman algorithms are used, Iknow that two independant Huffman compressions are done (one on bothlength and literals and the other one on the offset) but I don'tunders...

0 answers | 607 bytes |

Rate Distortion Optimization algorithms in JPEG2000

Hi,Can someone recommend some good algorithms for Rate Distortion for EBCT in JPEG2000? I am specially interested in VLSIhardware related algorithms.Regards,Sharjeel Saeed...

0 answers | 210 bytes |

paper comparing time complexity of compression algorithms

Hi,I'm searching for a paper that compares the time complexity for variouscompression algorithms (notably gzip and bzip2) for text data up to5MB. Is there some resource for that?While I'm at it: is there some paper that describes the concepts ofgzip and bzip2? So far I have not been ve...

6 answers | 366 bytes |

dgs defosse guillaume

This letter to "whom it may concerns" can be retrieved through thesearch-engines under "DGS" dirk or This letter is liable to ajudical research because of forgery in writings, calumny anddeflamation.DGS Compression TechnologyTo Whom It May Concern!Maybe a very strong (video) compression technolo...

29 answers | 7303 bytes |

THE NIGHTLIGHT CHALLENGE

I not sure about all of you, but I get tired of all hisposts about how great his stuff is and how arithemtic sucksand is so full of gaps that his stuff will always compressbetter. That is not true and I am sure that no matter how dumbhe pretends to be that he knows its not true. After all howcan...

13 answers | 1596 bytes |

Raw JPEG Data Size

I have a raw stream of data, part of which contains a JPEG (possiblynot in its entirity). I am attempting to extract (just extract, notinterpret) the image. Currently I detect the JPEG (JFIF) signature,then walk through the image for as long as possible by detecting validheaders and their size....

5 answers | 1017 bytes |

Video Compression Corpus?

I'm working on a video compression project and I'm trying to decidewhat a good corpus would be. As it is, it has a lot of magic numbers,unfortunately, so a good test is especially important. However, theredoesn't seem to be any sort of video compression corpus around. Anysuggestio...

0 answers | 334 bytes |

Anybody recognize this image header?

00000000h: 37 00 00 10 42 00 00 10 00 00 00 00 39 64 39 47 ;7B9d9G00000010h: 3C 4B 00 00 28 4B 00 00 28 00 00 00 50 00 00 00 ;<K(K(P00000020h: 3C 00 00 00 00 00 00 00 00 00 00 00 20 00 00 00 ; <00000030h: 01 00 00 00 00 00 00 00 00 00 00 00 ;It's the header for what appears to be an u...

6 answers | 699 bytes |