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Topic: SPIHT

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	SPIHT IMAGE COMPRESSION
		The SPIHT method is not a simple extension of traditional methods for image compression, and represents an important advance in the field.
		The SPIHT advantage is even more pronounced in encoding color images, because the bits are allocated automatically for local optimality among the color components, unlike other algorithms that encode the color components separately based on global statistics of the individual components.
		SPIHT represents a small "revolution" in image compression because it broke the trend to more complex (in both the theoretical and the computational senses) compression schemes.
	www.siliconimaging.com /SPIHT.htm (0 words)

	Activity Selective SPIHT Coding
		By classifying the coefficients according to their activity, the coder better distributes the compression artifacts around the less visually significant regions of the image thereby achieving higher perceptual quality than the standard SPIHT algorithm especially at low bit rates and around the strong edges of the image.
		The SPIHT coder [1] is a powerful image compression algorithm that produces an embedded bit stream from which the best reconstructed images in the mean square error sense can be extracted at various bit rates.
		In this paper, the differing activity regions are used to assign perceptual weights to the transform coefficients prior to SPIHT encoding.
	foulard.ece.cornell.edu /marcia/asspiht2.html (0 words)

	Activity Selective SPIHT Coding
		By classifying the coefficients according to their activity, the coder better distributes the compression artifacts around the less visually significant regions of the image thereby achieving higher perceptual quality than the standard SPIHT algorithm especially at low bit rates and around the strong edges of the image.
		The SPIHT coder [1] is a powerful image compression algorithm that produces an embedded bit stream from which the best reconstructed images in the mean square error sense can be extracted at various bit rates.
		This is a result of both the perceptually motivated spatially adaptive reordering as well as the scale-adaptive reordering that omits the finest wavelet coefficients at very low bit rates until the toggle bit rate is achieved.
	foulard.ee.cornell.edu /marcia/asspiht2.html (1199 words)

	MATLAB Central File Exchange - 3D-SPIHT
		These functions implement the 3D SPIHT algorithm, used for the compression of 3d wavelet coefficients.
		Such 3d wavelet coefficients are produced during the coding of video sequences.
		Comments: The 3D spiht implementation itself is very good.
	www.mathworks.com /matlabcentral/fileexchange/loadFile.do?objectId=11746&ref=rssfeed&id=mostRecentFiles (0 words)

	QccSPIHTDecodeHeader.3
		The SPIHT algorithm involves a 2D DWT followed by a progressive "bitplane" coding of the wavelet coefficients using a zerotree-like quantization structure.
		The usual way to handle arbitrarily shaped objects within SPIHT is to permanently set transparent regions in the image to "insignificant" during the SA-DWT so that the SPIHT algorithm processes these transparent regions in a manner identical to that of other insignificant coefficients.
		For an embedded coding, such as that produced by the SPIHT algorithm, any prefix of the final compressed bitstream may be decoded to produce a reconstruction of the original image.
	qccpack.sourceforge.net /Documentation/QccSPIHTDecodeHeader.3.html (2198 words)

	NEMO Nuclear Emergency Management : video compression
		SPIHT progression is by quad-processing of summations, leaving three differentials intact, but the contribution to bit-total by one is smallish by four...
		Though SPIHT is efficient, its bandwidth depends on brightness, which for video is of no consequence as the video channel is designed by regulatory convention (Internet-computer imaging does take advantage of minimized transmission and storage);-- or if the camera has further luminance detail, SPIHT lossless-successive approximation can bring it up.
		It is of interest to note that the base representation of a count of photons, is itself a first-level signal reduction, essentially runlength: the total number of values possible then fits into the arithmetic coding, which I showed was efficiently coded by entropic choreonumeration,- which can be as arithmetic or not, as needed.
	members.tripod.com /~GrandAdmiralPetry/videocram.html (4461 words)

	SPIHT - Wikipedia, the free encyclopedia
		SPIHT (Set Partitioning in Hierarchical Trees) is an image compression algorithm that exploits the inherent similarities across subbands in a wavelet decomposition of an image.
		The order in which coefficients are transmitted is recovered on the decoder using information of comparisons and sets being examined for significance during the sort, sets are created using hierarchical tree structure, i.e.
		One of the advantages with SPIHT is that it produces an (optimal) embedded bitstream.
	en.wikipedia.org /wiki/SPIHT (189 words)

	SPIHT, ACME Lab, Electrical Engineering, University of Washington
		The main advantage of SPIHT is that it is fully progressive, meaning that we do not need the whole file to see the image.
		SPIHT compression routine and optimized the algorithm for implementation in hardware.
		Scott Hauck, Associate Professor in the EE Department at University Washington, and director of ACME Labs.
	students.washington.edu /haselman/Spiht_files/Spiht.html (196 words)

	AOIJ Articles
		SPIHT has been defined for normal wavelet decomposed images as an embedded quantization process.
		If the coefficients obtained from Ridgelet transform of the image with more discontinuities along straight lines have to subject to quantization process with SPIHT, the existing structure of the SPIHT should be modified to suit with the output of the Finite Ridgelet Transform (FRIT).
		The results obtained from the combination of FRIT with modified SPIHT found much better than that obtained from the combination of Wavelet Transform with SPIHT.
	www.acadjournal.com /Articles.asp?Issue=13& (2435 words)

	Junqing Chen's Homepage
		It predicts that at very low bit rates the SPIHT algorithm and the 8 X 8 PIC coder perform the best, while at high bit rates the 4 X 4 PIC coder is the best.
		This is not surprising, as the SPIHT algorithm is designed to minimize the MSE and has no perceptual weighting.
		Observe that the distortion is considerably higher for SPIHT image, especially near the wall on the left where there is substantial blurring.
	commnet.ece.northwestern.edu /~jqchen/research.html (1527 words)

	[No title] (Site not responding. Last check: )
		Also, fixed memory leaks in Wavelet SPIHT Demo application.
		SPIHT Matlab code (Almost perfect) Now has test script.
		Original SPIHT paper: Amir Said and William A. Pearlman - A New Fast and Efficient Image Codec Based on Set Partitioning in Hierarchical Trees.
	www.cs.ru.ac.za /research/previous/g01H2306/research.html (415 words)

	[No title]
		An efficient variant of the SPIHT algorithm, Virtual SPIHT (VSPIHT) is developed which combines many of the clustered zerotrees into fewer and longer zerotrees to improve coding efficiency.
		The error vulnerability of SPIHT and VSPIHT image coders is studied, based on which a bit-partitioning strategy suitable for unequal error protected channel coding for transmission over unreliable channels is suggested.
		A robust SPIHT algorithm is also suggested, in which bit-streams are re-organised in such a way that the channel errors can be detected in the decoder by exploiting inherent redundancies in the decoded image.
	privatewww.essex.ac.uk /~ghan/ResearchStudents/ekram.doc (1143 words)

	Koders - spihtencode.h (Site not responding. Last check: )
		An * implementation of the SPIHT algorithm is included herein with the gracious * permission of Dr. William A. Pearlman, President of PrimaComp, Inc., * exclusive holder of patent rights.
		Use of the SPIHT source code, including any executable-program or * linkable-library form resulting from its compilation, is restricted to * solely academic or non-commercial research activities.
		Any other use, including, but not limited to, use in the development * of a commercial product, use in a commercial application, or commercial * distribution, is prohibited by this license.
	www.koders.com /c/fid08575EAE5B744233F8403E3D5EFC9072F9CAE3C0.aspx (234 words)

	SPIHT at AllExperts
		SPIHT (Set Partitioning in Hierarchical Trees) is an image compression algorithm that exploits the inherent similarities across subbands in a wavelet decomposition of an image.
		The order in which coefficients are transmitted is recovered on the decoder using information of comparisons and sets being examined for significance during the sort, sets are created using hierarchical tree structure, i.e.
		One of the advantages with SPIHT is that it produces an (optimal) embedded bitstream.
	en.allexperts.com /e/s/sp/spiht.htm (231 words)

	Eugenio Ballini's Home Page
		A look of the PSNR values for the JPEG 2000 shows that the decrement of these values with the increment of the compression ratio is almost linear and it does not present unexpected sudden decrement, as happens for the JPEG standard.
		Figure 6.12 shows the PSNR values obtained for the 3 different methods, on the left, and as differences between SPIHT and JPEG 2000 with JPEG, on the right, as the mean of the values of the 5 test images, for different values of bit rates.
		All the PSNR results obtained for the 5 images and their mean, for the 3 different compression methods at various compression ratios are also summarised in Table 6.8.
	digilander.libero.it /eugenioballini/eugtesiwavc6.html (3793 words)

	Free-Response Receiver Operating Characteristic Evaluation of Lossy JPEG2000 and Object-based Set Partitioning in ...
		SPIHT 80:1 compression was observed at a P value of 5%.
		SPIHT) at 40:1 and 80:1 compression ratios on the detection of clusters
		SPIHT, and 112 mammograms compressed at 80:1 with object-based SPIHT.
	radiology.rsnajnls.org /cgi/content/full/237/2/450 (5147 words)

	[No title] (Site not responding. Last check: )
		In the SPIHT algorithm, the image is first decomposed into a number of subbands using hierarchical wavelet decomposition.
		However, the average performance of SPIHT with arithmetic coding is similar to that of H.263.
		Thus, the scalable property of the SPIHT algorithm means that a decoder can decode as much or as little of a frame as it can, and still decode something meaningful.
	www-mice.cs.ucl.ac.uk /multimedia/projects/javic/docs/UOB_Progress_Report_Oct_99.doc (2035 words)

	IP-3517: Real-time Implementation of A New Low-Memory SPIHT Image Coding Algorithm Using DSP Chip (Site not responding. Last check: )
		However, SPIHT’s high memory requirement is a major drawback for hardware implementation.
		In this paper, we propose a new low-memory SPIHT algorithm by presenting three new concepts: “number of error bits”, “absolute zero” and “absolute zerotree”.
		Our experimental results show that the implementation meets common real-time requirements of video coding and the visual quality is comparable to that of the original SPIHT algorithm.
	www.ewh.ieee.org /soc/sps/tip/abstracts_olderEDICS/dir_abstracts/abst_1-STIL/abst_ip3517.html (280 words)

	Title page for ETD etd-03242005-092314 ( Browse \| Search ) All Available ETDs
		The second part involved the development of a motion-compensated 3-D compression codec and a modified SPIHT algorithm designed specifically for this codec by incorporating an advantage in the design of 2D SPIHT into the 3D SPIHT coder.
		In an experiment that compared their performances, the 3D motion-compensated codec with unmodified 3D SPIHT had gains of 0.3dB to 4.88dB over regular 2D wavelet-based motion-compensated codec using 2D SPIHT in the coding of 19 endoscopy sequences at 1/40 compression ratio.
		The effectiveness of the modified SPIHT algorithm was verified by the results of a second experiment in which it was used to re-encode 4 of the 19 sequences with lowest performance gains and improved them by 0.5dB to 1.0dB.
	etd.library.pitt.edu /ETD/available/etd-03242005-092314 (322 words)

	The Wavelet Digest :: View topic - Applying SPIHT on QUINCUNX
		Unfortunately, SPIHT was devised to be used with a separable wavelet transform.
		I was also trying to implement a state-of-the-art algorithm with a NS lifting based wavelet transform.
		It shows that if you wish to measure image quality with respect to PSNR, the 9-7 separable transform with SPIHT performs much better than its NS counterparts.
	www.wavelet.org /phpBB2/viewtopic.php?t=5477 (143 words)

	Low-Memory Packetized SPIHT Image Compression - Wheeler, Pearlman (ResearchIndex) (Site not responding. Last check: )
		Abstract: The SPIHT image compression algorithm is modified for application to large images with limited processor memory.
		The subband decomposition coefficients are partitioned into small tree-preserving spatial blocks which are each independently coded using the SPIHT algorithm.
		There was no further entropy coding in SPIHT, as only raw uncoded sign, decision, and refinement bits were sent to the bit stream....
	citeseer.ist.psu.edu /wheeler99lowmemory.html (457 words)

	ETD-db: ETD database
		As a result, the PRD obtained with mQC-I is close to the lower one obtained with SPIHT and SPIHT+UEP, regardless of the different degrees of transmission errors.
		Moreover, compared to SPIHT, the mQC-I reduces the amount of the pilot bit stream to maintain the mQC processing gain at higher BER, and improve the quality degradation caused by the introduction of the pilot redundancy bits at lower BER.
		Following these cases, the same ideas of two proposed design methodologies can be extended to other platforms and medical signals/data of new or existing mobile telemedicine applications such that they may become the essential features of the next-generation mobile telemedicine platforms in the future.
	thesis.lib.cycu.edu.tw /ETD-db/ETD-search/view_etd?URN=etd-1015104-135017 (517 words)

	Imaging On-Line Store
		While the Set Partitioning into Hierarchical Trees (SPIHT) coder can tolerate errors in the VBC stream, the same is not true for the LBC stream.
		In order to minimize the probability of catastrophic error which is a characteristic of progressive image coders, the algorithm assigns more protection to the LBC stream than a equal error protection scheme (EEP) would.
		For robust transmission of progressive video, we use motion compensated 3-D SPIHT (MC-SPIHT) with asymmetric tree structure, and divide the compressed video bitstreams into two classes according to the bit error sensitivities.
	www.imaging.org /store/epub.cfm?abstrid=30626 (726 words)

	Highly scalable image compression based on SPIHT for network applications
		This article was originally published as: Danyali, H & Mertins, A, Highly scalable image compression based on SPIHT for network applications, Proceedings International Conference on Image Processing, 22-25 September 2002, 1, 1-217 - 1-220.
		We propose a highly scalable image compression scheme based on the set partitioning in hierarchical trees (SPIHT) algorithm.
		Our algorithm, called highly scalable SPIHT (HS-SPIHT), supports spatial and SNR scalability and provides a bitstream that can be easily adapted (reordered) to given bandwidth and resolution requirements by a simple transcoder (parser).
	ro.uow.edu.au /infopapers/72 (155 words)

	UNIVERSITY OF PITTSBURGH
		The second part involved the development of a motion-compensated 3-D compression codec and a modified SPIHT algorithm designed specifically for this codec by incorporating an advantage in the design of 2D SPIHT into the 3D SPIHT coder.
		In an experiment that compared their performances, the 3D motion-compensated codec with unmodified 3D SPIHT had gains of 0.3dB to 4.88dB over regular 2D wavelet-based motion-compensated codec using 2D SPIHT in the coding of 19 endoscopy sequences at 1/40 compression ratio.
		The effectiveness of the modified SPIHT algorithm was verified by the results of a second experiment in which it was used to re-encode 4 of the 19 sequences with lowest performance gains and improved them by 0.5dB to 1.0dB.
	www.engrng.pitt.edu /Electrical/news/jchien.htm (325 words)

	Re: Видеосжатие, SPIHT (Site not responding. Last check: )
		Я тоже пытался делать подобный _полноценный_ вэъвлет ВИДЕО кодек (правда про SPIHT тогда не знал - пришлось придумать свою схему - похожую)
		Я тоже пытался делать подобный _полноценный_ вэъвлет ВИДЕО кодек (правда про SPIHT тогда не знал - пришлось придумать свою схему - похожую) > > Вот проблемы были следующий (как ты их решил или будешь рещать) > > 1.
		Мне понравился > трехмерный SPIHT в силу его схожести > с двумерным, красоты и логичности.
	www.compression.ru /forum/messages/789.htm (450 words)

	Caltech Authors - Multi-resolution adaptation of the SPIHT algorithm for multiple description
		In particular, we protect an embedded SPIHT bitstream by adding to that bitstream periodic descriptions of state information from the encoder, and we demonstrate how the state information can be used to recover lost bits.
		For low probabilities of network packet loss, the proposed algorithm achieves performance within 0.35 dB of the performance of a more sophisticated channel coding algorithm when both algorithms are applied to same SPIHT embedded source code.
		You are granted permission for individual, educational, research and non-commercial reproduction, distribution, display and performance of this work in any format.
	authors.library.caltech.edu /4758 (352 words)

	REWIC: RATIONAL EMBEDDED WAVELET IMAGE CODER
		The following experimental results illustrate the comparative performance of the resultant scheme with both the state of the art in progressive transmission SPIHT and the state of art coder JPEG2000.
		Results were obtained without entropy-coding the bits put out with both SPIHT and REWIC with self-control.
		The next table summarizes the mean quality factors for different decoded outputs using the compression methods.
	decsai.ugr.es /cvg/REWIC.intro/rewic_with_self_control/index.html (2562 words)

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