Journal ArticleDOI
Image compression using wavelets and JPEG2000: a tutorial
S. Lawson,J. Zhu +1 more
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TLDR
This paper aims in tutorial form to introduce the DWT, to illustrate its link with filters and filterbanks and to illustrate how it may be used as part of an image coding algorithm.Abstract:
The demand for higher and higher quality images transmitted quickly over the Internet has led to a strong need to develop better algorithms for the filtering and coding of such images. The introduction of the JPEG2000 compression standard has meant that for the first time the discrete wavelet transform (DWT) is to be used for the decomposition and reconstruction of images together with an efficient coding scheme. The use of wavelets implies the use of subband coding in which the image is iteratively decomposed into high- and low-frequency bands. Thus there is a need for filter pairs at both the analysis and synthesis stages. This paper aims in tutorial form to introduce the DWT, to illustrate its link with filters and filterbanks and to illustrate how it may be used as part of an image coding algorithm. It concludes with a look at the qualitative differences between images coded using JPEG2000 and those coded using the existing JPEG standard.read more
Citations
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Proceedings ArticleDOI
Color Image Watermarking Algorithm Based on DWT-SVD
TL;DR: A novel watermarking scheme of embedding a scrambling watermark into the green component of the color image based on DWT-SVD is proposed, which indicates that the watermark is robust to JPEG compression, cropping, Gaussian noise, median filter and resize.
Journal ArticleDOI
Illumination-tolerant face verification of low-bit-rate JPEG2000 wavelet images with advanced correlation filters for handheld devices
TL;DR: This work explores how advanced correlation filters, such as the minimum average correlation energy filter and its variants, perform by using face images captured under different illumination conditions and encoded with different bit rates under the JPEG2000 wavelet-encoding standard.
Proceedings ArticleDOI
Continuous dynamic Indian Sign Language gesture recognition with invariant backgrounds
TL;DR: This work has proposed a continuous Indian Sign Language (ISL) gesture recognition system where single hand or both the hands have been used for performing gestures and this framework provides vary less time complexity as well as space complexity.
Journal ArticleDOI
Image quality comparison between JPEG and JPEG2000. I. Psychophysical investigation
TL;DR: A comparison of subjective image quality between JPEG and JPEG 2000 to establish whether JPEG 2000 does indeed demonstrate significant improvements in visual quality, and a particular focus of this work is the inherent scene dependency of the two algorithms and their influence on subjective imagequality results.
Local B-Spline Multiresolution with Example in Iris Synthesis and Volumetric Rendering.
TL;DR: This work introduces local multiresolution filters for quadratic and cubic B-splines that satisfy the first and the second level of smoothness respectively, and proposes a technique based on symmetric extension to extend these filters.
References
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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.
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Martin Vetterli,Jelena Kovacevic +1 more
TL;DR: Wavelets and Subband Coding offered a unified view of the exciting field of wavelets and their discrete-time cousins, filter banks, or subband coding and developed the theory in both continuous and discrete time.
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High performance scalable image compression with EBCOT
TL;DR: A new image compression algorithm is proposed, based on independent embedded block coding with optimized truncation of the embedded bit-streams (EBCOT), capable of modeling the spatially varying visual masking phenomenon.