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Topic: Multimedia compression

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	Compression of Multimedia Information
		Second, the right compressor sequentially applies three or four algorithms (preprocessing-filtering, compression of words, then bytes, and finally bits), and the last one is statistical, as a rule, though first two or three can be transforming.
		If further compression of RLE output is expected, it's possible to create four output streams/blocks: lengths of repetitions N[i]; elements of repetitions Z[i]; lengths of other fragments, where repetitions were not found, R[i]; other fragments OF[i].
		PBS is used for lossless compression of multimedia files in ERI32 compressor, setting up world record on the most popular set of 24-bit pictures, Kodak True Color Images [21].
	geocities.com /eri32/mmd.htm (3634 words)

	Multimedia Technical Briefs - Set Two
		The second reason that compression is essential is that current networks and storage devices are unable to present the information in real time without the use of data compression.
		The second method of data compression is the application of a compression algorithm that is dependant on the nature of the information being compressed.
		Compression is accomplished by dividing an image into small pixel blocks that are halved repeatedly until the desired compression ratio is achieved.
	www.itstudyguide.com /papers/rwDISS780TBS2.htm (1929 words)

	Video coding - Wikipedia, the free encyclopedia
		Therefore, it is often referred to as multimedia.
		Because multimedia typically derives from data sampled by a device such as a camera or a microphone, and because such data contains large amounts of random noise, traditional lossless compression algorithms tend to do a poor job compressing multimedia.
		Multimedia compression has become the primary focus of compression research, primarily in a search for more efficient models.
	en.wikipedia.org /wiki/Multimedia_compression (399 words)

	Compression
		Compression techniques (both lossy and lossless) play a very important role in enabling effective multimedia design, development, and distribution.
		These lossless compression techniques are suitable for wide range of applications, from hard disk file compression to digital medical image archiving, where data loss is usually not allowed.
		Lossless and lossy compression techniques have different advantages and they are both important to multimedia compression.
	www.csi.edu /support/itc/photoshop/compression.htm (1071 words)

	iApplianceWeb-iApplianceReview (Site not responding. Last check: 2007-11-03)
		The demand for multimedia communications is increasing every year, spurredon by the deployment of emerging compression and communication technologies.
		Multimedia compression is central to achieving efficient use of storage and bandwidth available.
		These compression standards strive to address a broad range of application areas and are characterized by 'profile' and 'level' of operation.
	www.iapplianceweb.com /story/oeg20030605s0033.htm (2186 words)

	Multimedia compression system with adaptive block sizes (US6337881)
		A multimedia compression system for generating frame rate scalable data in the case of video, and, more generally, universally scalable data Universally scalable data is scalable across all of the relevant characteristics of the data.
		The scalable data generated by the compression system is comprised of multiple additive layers for each characteristic across which the data is scalable.
		The compression system further provides for embedded inter-frame compression in the context of frame rate scalability, and non-redundant layered multicast network delivery of the scalable data.
	www.delphion.com /details?pn10=US06337881 (864 words)

	A Practical Introduction To Data Compression
		The so-called LOSSY compression consists of two different processes (not independent, and parallel, as a rule): (1) extracting useful parts from blocks, creating model depending on the purpose of compression, the peculiarities of both source and destination of information, and improving as much as possible (data for) step (2) lossless compression.
		If "compressed" block is longer than initial - it's not compression but recoding by definition, regardless of what nearly half of currently existing compressors "think" about it (increasing size to 1% - 5%, instead of 1 bit, in "worst cases" of incompressible data).
		For some reasons the majority of compression programs today simply skip the third step (compression of blocks of bits), or stick it together with the second (compression of blocks of bytes), starting with assumption "a block of words is given".
	geocities.com /eri32/int.htm (2444 words)

	Adam's Multimedia Tutorial
		Alas, purity of the algorithm is not the only thing to consider when picking a compression method; we also have to think about who owns the player.
		When compressing a multimedia file for the Web you often have to use proprietary software (especially if you are interested in having your file stream onto the page).
		Once the file is compressed and up on your server, it is usually only accessible to users who have the player created by the same company that developed your compression or encoding tool.
	www.webmonkey.com /98/17/index0a_page3.html?tw=multimedia (375 words)

	DataCompression.info - Image Compression (Site not responding. Last check: 2007-11-03)
		Compression that is specifically oriented towards still images is given here.
		Compression is one of them, and there is certainly a great deal to learn about compression and media formats at this conference.
		By using data compression techniques, it is possible to remove some of the redundant information contained in images, requiring less storage space and less time to transmit.
	datacompression.info /ImageCompression.shtml (7433 words)

	Image compression - Wikipedia, the free encyclopedia
		This is because lossy compression methods, especially when used at low bit rates, introduce compression artifacts.
		Lossless compression methods may also be preferred for high value content, such as medical imagery or image scans made for archival purposes.
		The quality of a compression method is often measured by the Peak signal-to-noise ratio.
	en.wikipedia.org /wiki/Image_compression (542 words)

	Research in Data Compression
		It is competitive with other competing technologies in terms of compression ratios, far superior in terms of decompression time (extremely fast even with weak computational resources), and promises to provide a way of treating uniformly all kinds of multimedia data (whereas current schemes use different technologies for each).
		For images of good quality our compression ratio is competitive to JPEG and wavelet image compression, however, our theoretical results suggest that we still have a room for further improvements.
		When investigating this aspect of compression (i.e., extension of Lempel-Ziv type compression to graphical objects), we expect that some of our work in the area of computational geometry to be helpful.
	www.cs.purdue.edu /homes/spa/software.html (1087 words)

	Linux Links - The Linux Portal: Software/Multimedia/Tools/Compression
		Bonk is an audio compression program that operates in both lossy and lossless modes.
		The compression method Bonk uses is quite simple compared to other lossy formats (such as MP3), and is based on speech compression techniques.
		lossy: The compression may be specified either in terms of an average number of bits per sample, or in terms of an acceptable (perceptually weighted) signal to noise ratio.
	www.linuxlinks.com /Software/Multimedia/Tools/Compression (624 words)

	Run Length Encoding - MultimediaWiki
		RLE compression naturally works best where there are long runs of the same pixel value.
		At worst, there will be no compression if there are almost no pairs of adjacent pixels with the same value.
		RLE was often seen in older multimedia compression schemes.
	wiki.multimedia.cx /index.php?title=Run_Length_Encoding (510 words)

	Multimedia Compression on the Internet
		In recent times, we have witnessed an explosive growth of multimedia technologies.The need to store and transmit large masses of information is growing very rapidly along with increasing number of applications in diverse fields covering the spectrum of human civilization in the new millenium.
		Engineers and computer scientists need a fundamental understanding of data compression technologies to work with large variety of data (text, image, video, sound and any combination of these types) types and increasingly data-intensive applications.
		Of special interest to you will be the compression utility where you can click to try most of the currently available algorithms in the literature on text compression.
	www.cs.ucf.edu /courses/cap5015 (485 words)

	Mihaela van der Schaar (Site not responding. Last check: 2007-11-03)
		She was a guest editor of the EURASIP Special issue on multimedia over IP and wireless networks and the general chair of Picture Coding Symposium 2004, the oldest conference on image/video coding.
		She is a senior member of IEEE, and was also elected as a Member of the Technical Committee on Multimedia Signal Processing of the IEEE Signal Processing Society.
		She was an Associate Editor of IEEE Transactions on Multimedia and SPIE Electronic Imaging Journal from 2002-2005.
	www.ee.ucla.edu /faculty/bios/mvanderschaar.htm (623 words)

	MultiMedia Signal Processing Lab - Home
		Undergraduate students are EPFL students or full-time visiting students from other universities, each staying for a period of around 6 months and involved in one of the research projects of the group.
		Compression includes still image, video and 3D image coding.
		Processing/interpretation includes image and video analysis such as change detection, feature point extraction and tracking, object segmentation and tracking, compressed domain processing, and multi-modal man-machine interface for interactive communication.
	mmspl.epfl.ch (309 words)

	Computer Science - CS 410 Top: Introduction to Multimedia Networking (4 credits) (Site not responding. Last check: 2007-11-03)
		Explores the interaction between multimedia data and the systems that need to support multimedia data such as audio and video.
		Topics that will be covered in the course include: compression technologies, multimedia formats such as JPEG and MPEG, multimedia streaming over reservation-based and best-effort networks, multicasting of multimedia data, and systems support for multimedia computing.
		The main goal of CS 410/510 Introduction to Multimedia Networking is to teach students the necessary operating system and networking techniques necessary to support continuous multimedia data.
	www.cs.pdx.edu /course.php?cid=321 (530 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		This tutorial is targeted at the practically oriented researcher or developer who is interested in details about the foundation concepts and mechanisms used in multimedia data compression.
		Data compression reduces the size of multimedia by reducing an object's redundancy.
		Lossy compression investigates the tradeoff of compression vs. error distortion.
	www.mm2004.org /files/MMDataCompression.doc (654 words)

	WebCampus.Stevens:: Multimedia Technology
		Study detection techniques for multimedia signals, specify multimedia representation for service requirements, and evaluate multimedia representations to satisfy user applications.
		Recent advances in multimedia transmission over Internet and mobile devices necessitate one to understand the requirements of the media information concepts and issues involved in maximizing end user quality.
		Hands-on experience in various aspects of multimedia communications through the various assignments and projects (Pointers to necessary programs available for educational purposes in the Internet) will be specified.
	webcampus.stevens.edu /courses/multimedia.html (482 words)

	Multimedia Fundamentals, Volume 1: Media Coding and Content Processing, 2nd Edition - $50.15 (Site not responding. Last check: 2007-11-03)
		Multimedia Systems are becoming an integralpart of our heterogeneous computing and communication environment.
		Multimedia requires new considerations for storage devices,and we present in Chapter 8 basic optical storage technology as well as techniques thatrepresent the core of the Compact Disc-Digital Audio (CD-DA), Compact Disc-ReadOnly Memory (CD-ROM), and Digital Versatile Disc (DVD) technologies.
		Multimedia fundamentals in the System and Servicedomain will be covered, such as Quality of Service, soft-real-time scheduling, mediaservers and disk scheduling, streaming protocols, group communication, and synchronization.Volume 3 will emphasize some of the problems in the Service and Applicationdomains of a distributed multimedia system.
	www.phptr.com /title/0130313998 (974 words)

	IMA audio compression for QuickTime files
		Audio compression is often your worst nightmare when dealing with multimedia applications or digital video.
		While most digital video compression codecs do a good job reducing the size of the video images, they don't reduce the size of the soundtrack very much.
		IMA audio compression reduces the size of your audio file by a factor of 4, resulting in a 75% saving.
	members.aol.com /JordanGold/IMAmain.html (704 words)

	Visual Data Compression for Multimedia Applications - Ebrahimi, Kunt (ResearchIndex) (Site not responding. Last check: 2007-11-03)
		Abstract: this paper, the compression of visual information in the framework of multimedia applications is discussed.
		To this end, major approaches to compress still as well as moving pictures are reviewed.
		The most important objective in any compression algorithm is that of compression efficiency.
	citeseer.ist.psu.edu /ebrahimi98visual.html (2002 words)

	Real-Time Multimedia Communications Systems
		Network and multimedia technologies and architectures for the legacy standards supporting traditional networks and these new IP networks and the internetworking of systems will be featured throughout the seminar.
		Educated decisions are to be made and pitfalls to be avoided as diverse disciplines in media compression and network transmission complement and converge.
		Thorough discussions and extensive analysis of new and future compression technologies over current and future networks will assist you in making winning technical and business decisions for products and services in multimedia communications systems and interactive distribution markets.
	www.knk-mpeg.com /multi.htm (1082 words)

	MPEG-FAQ: multimedia compression [4/9]
		Both streams are designed to support a large number of known and anticipated applications, and they retain a significant amount of flexibility such as may be required for such applications, while providing interoperability between different device implementations.
		Streaming of multimedia data is a significantly different way of delivery, as the user can view / hear the data as it is being transmitted instead of waiting for file transfer completion, and there is no requirement for complex file systems such as Netware or NFS.
		For example, a sequence compressed at 320x240 can be played back at 320x240 or 640x480 (depending on the performance of the host computer).
	www.opennet.ru /docs/FAQ/multimedua/mpeg-faq/part4.html (7390 words)

	Advanced Compression Technology: LEAD's iCompress Technologies (Site not responding. Last check: 2007-11-03)
		The LEAD iCompress technology brand name communicates the intelligence of the core technologies that enable enterprise and developers to access, compress, and manipulate all types of multimedia content.
		LEAD iCompress technologies can be best described as a multimedia imaging "engine" that can allow developers, enterprises, and end users the ability to format various digital content files so they can be utilized on multiple devices and platforms.
		This allows you to take advantage of the compressors' standard compression algorithm as well as LEAD’s proprietary extension to this standard resulting in the most efficient compression available.
	www.leadtools.com /icompress.htm (298 words)

	MULTIMEDIA COMMUNICATIONS: TECHNOLOGIES, SYSTEMS AND SERVICES
		Multimedia is an emerging field with boundless applications.
		This course presents the concepts of Multimedia Communications and addresses specific questions pertaining to the key technologies, applications and component-technologies such as compression algorithms, storage technologies, hardware/software, Multimedia User Interaction, Multimedia Synchronization, etc. A detailed overview of architectural requirements for supporting Multimedia Communication is presented, including networking technologies such as N-ISDN, ATM and wireless LANs.
		Multimedia principles, requirements, benefits and reasons for the surge in demand.
	www.oei-edu.com /s651.htm (713 words)

	IK Multimedia SampleTank 1.1 Review
		From the cucina of IK Multimedia comes a new multitimbral VST sample playback instrument, SampleTank 1.1, with four stereo outputs, onboard effects, and a proprietary file-compression scheme that cut sample sizes in half.
		IK Multimedia says that version 1.1 is optimized for Mac G4 multiprocessor machines, has a new resampling engine, and allows the L version of the plug-in to read any sounds in the SampleTank format.
		Waveforms are compressed using IK Multimedia's 2:1 compression scheme, which the company has dubbed 2Pack.
	emusician.com /dsp/emusic_ik_multimedia_sampletank (1819 words)

	Multimedia - Video Compression (Site not responding. Last check: 2007-11-03)
		It's best to create small movies at medium compression, and then when finished, they can be compressed more.
		Also, JPEG compresses within a frame (intraframe), and further compression can often be achieved by compressing between frames (interframe).
		The Moving Pictures Expert Group (MPEG) compression algorithm compresses by as much as 1/200 with high quality picture (and sound).
	www.cs.wpi.edu /~kal/elecdoc/MMvideocompression.html (190 words)

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