Journal ArticleDOI
Research: JPEG based scalable image compression
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TLDR
A high-performance technique based on Wavelet filter downsampling for achieving spatial scalability within the framework of the hierarchical mode of the JPEG standard is presented.About:
This article is published in Computer Communications.The article was published on 1996-10-01. It has received 14 citations till now. The article focuses on the topics: Lossless JPEG & JPEG 2000.read more
Citations
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Patent
Digital signal encoding method, decoding method, encoding device, decoding device, digital signal encoding program, and decoding program
TL;DR: In this paper, the sampling frequency of a digital signal is converted from 96 kHz to 48 kHz for each frame by a down-sampling unit and the signal converted is compressed/encoded and output as a main code Im.
Journal ArticleDOI
Four-image encryption method based on spectrum truncation, chaos and the MODFrFT
TL;DR: The resulting performance is better than other similar algorithms in literature where the spectrum truncation is done in discrete Fourier transform(DFT) domain and the complex mode is introduced to reduce the data loss.
Patent
Transform coefficient compression using multiple scans
TL;DR: A transform coefficient block (210) of a frequency domain representation of a digital image is processed by performing scans (212, 214, 216) on at least three different regions of the block as mentioned in this paper.
Patent
Reduced complexity idct decoding with graceful degradation
TL;DR: In this article, data compressed according to a lossy DCT-based algorithm, such as the MPEG or MPEG2 algorithms, is decompressed according to dynamically selected set of DCT coefficients, with unused coefficients masked out.
Patent
Apparatus and method for resolution transformation of orthogonal transformation image
TL;DR: In this article, a resolution transformation apparatus which has longitudinal and lateral change ratio input is described, where the orthogonal transformation blocks are extracted from before-transformation image memory.
References
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Journal ArticleDOI
A theory for multiresolution signal decomposition: the wavelet representation
TL;DR: In this paper, it is shown that the difference of information between the approximation of a signal at the resolutions 2/sup j+1/ and 2 /sup j/ (where j is an integer) can be extracted by decomposing this signal on a wavelet orthonormal basis of L/sup 2/(R/sup n/), the vector space of measurable, square-integrable n-dimensional functions.
Journal ArticleDOI
The JPEG still picture compression standard
TL;DR: The Baseline method has been by far the most widely implemented JPEG method to date, and is sufficient in its own right for a large number of applications.
Journal ArticleDOI
Image coding using wavelet transform
TL;DR: A scheme for image compression that takes into account psychovisual features both in the space and frequency domains is proposed and it is shown that the wavelet transform is particularly well adapted to progressive transmission.
Book
JPEG: Still Image Data Compression Standard
TL;DR: This chapter discusses JPEG Syntax and Data Organization, the history of JPEG, and some of the aspects of the Human Visual Systems that make up JPEG.
Journal ArticleDOI
MPEG: a video compression standard for multimedia applications
TL;DR: Design of the MPEG algorithm presents a difficult challenge since quality requirements demand high compression that cannot be achieved with only intraframe coding, and the algorithm’s random access requirement is best satisfied with pure intraframes coding.