Cisco Cisco TelePresence MX700 Dépliant

Cisco TelePresence Products using TC Software

License information guide

D14767.03

License Information for products using TC Software, TC4.2 July 2011.

www.cisco.com

PPM images to and from a wide range of other formats, thus

making cjpeg/djpeg considerably more useful. The latest version

is distributed by the NetPBM group, and is available from numerous

sites, notably ftp://wuarchive.wustl.edu/graphics/graphics/

packages/NetPBM/. Unfortunately PBMPLUS/NETPBM is not nearly

as portable as the IJG software is; you are likely to have difficulty

making it work on any non-Unix machine.
A different free JPEG implementation, written by the PVRG group

at Stanford, is available from ftp://havefun.stanford.edu/pub/jpeg/.

This program is designed for research and experimentation rather

than production use; it is slower, harder to use, and less portable

than the IJG code, but it is easier to read and modify. Also, the

PVRG code supports lossless JPEG, which we do not. (On the

other hand, it doesn’t do progressive JPEG.)

FILE FORMAT WARS
Some JPEG programs produce files that are not compatible with

our library. The root of the problem is that the ISO JPEG committee

failed to specify a concrete file format. Some vendors “filled in

the blanks” on their own, creating proprietary formats that no

one else could read. (For example, none of the early commercial

JPEG implementations for the Macintosh were able to exchange

compressed files.)
The file format we have adopted is called JFIF (see REFERENCES).

This format has been agreed to by a number of major commercial

JPEG vendors, and it has become the de facto standard. JFIF is

a minimal or “low end” representation. We recommend the use of

TIFF/JPEG (TIFF revision 6.0 as modified by TIFF Technical Note

#2) for “high end” applications that need to record a lot of additional

data about an image. TIFF/JPEG is fairly new and not yet widely

supported, unfortunately.
The upcoming JPEG Part 3 standard defines a file format called

SPIFF. SPIFF is interoperable with JFIF, in the sense that most

JFIF decoders should be able to read the most common variant

of SPIFF. SPIFF has some technical advantages over JFIF, but its

major claim to fame is simply that it is an official standard rather

than an informal one. At this point it is unclear whether SPIFF will

supersede JFIF or whether JFIF will remain the de-facto standard.

IJG intends to support SPIFF once the standard is frozen, but we

have not decided whether it should become our default output

format or not. (In any case, our decoder will remain capable of

reading JFIF indefinitely.)
Various proprietary file formats incorporating JPEG compression

also exist. We have little or no sympathy for the existence of these

formats. Indeed, one of the original reasons for developing this free

software was to help force convergence on common, open format

standards for JPEG files. Don’t use a proprietary file format!

TO DO
The major thrust for v7 will probably be improvement of visual

quality. The current method for scaling the quantization tables

is known not to be very good at low Q values. We also intend

to investigate block boundary smoothing, “poor man’s variable

quantization”, and other means of improving quality-vs-file-size

performance without sacrificing compatibility.
In future versions, we are considering supporting some of the

upcoming JPEG Part 3 extensions --- principally, variable

quantization and the SPIFF file format.
As always, speeding things up is of great interest.
Please send bug reports, offers of help, etc. to jpeg-info@uunet.

uu.net.

Kmod-*, GPLv2

Kmod-audio-dsp.gz
Kmod-davinci-pci.gz
Kmod-fpgaloader.gz
Kmod-leds.gz
Kmod-marvell-phy.gz
Kmod-marvell-switch.gz
Kmod-register.gz
Kmod-saturn-cpld.gz
Kmod-saturn-gpio.gz
Kmod-ttmon.gz

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Contents

Introduction

Supported RFCs