Visual cognition is of significant importance in certain imaging applications, such as security and surveillance. In these applications, an important issue is to determine the cognition threshold, which is the maximum distortion level that can be applied to the images while still ensuring that enough information is conveyed to recognize the scene. The cognition task is usually studied with imag...

In this paper, we propose a generic hybrid oriented-transform and wavelet-based image representation for intra-band image coding. We instantiate for three popular directional transforms having similar powers of approximation but different redundancy factors. For each transform type, we design a compression scheme wherein we exploit intra-band coefficient dependencies. We show that our schemes o...

The LeGall 5/3 and Daubechies 9/7 filters have risen to special prominence because they were selected for inclusion in the JPEG2000 standard. We determine their key mathematical features: Riesz bounds, order of approximation, and regularity (Hölder and Sobolev). We give approximation theoretic quantities such as the asymptotic constant for the L2 error and the angle between the analysis and syn...

A pressure-induced crossover from normal Ferroelectic-to-Relaxer behavior has been observed in single crystal [Pb(Zn1BNb~)03]o.go5 (PbTi03)o.og5,or PZN 9.5% PT. Analogy with similar observations for other perovskites indicates that this crossover is a general feature of compositionally-disordered soft mode ferroelectrics. The Pressure-Temperature phase diagram has been also determined.

The species of the genus Brulleia Szépligeti, 1904 (Hymenoptera, Braconidae, Helconinae) from China are revised. Four new species, namely Brulleia fanjingensis YanandChen, sp. n., Brulleia longipalpis YanandChen, sp. n., Brulleia noncarinata YanandChen, sp. n. andBrulleia punctata Yan andChen, sp. n. are described and illustrated. A key to the Chinese species of the genus Brulleia is included.

Common compression systems treat color image channels similarly. Nonlinear color models like Hue-Saturation Value/ Brightness/ Luminance/ Intensity (HSV/ HSB/ HSL/ HSI) have special features for each channel. In this paper a new hybrid compression system is proposed for encoding color images in HSI color model. The proposed encoding system deals with each channel with a suitable compression tec...

Many organizations have made substantial progress on solving the year 2000 computer problem while many others lag perilously behind. With the year 2000 deadline looming ever closer, this article examines several key issues including: the nature of the year 2000 problem itself, its potential to do harm, the progress that organizations have made to date on this issue, and factors that have worked...

In this paper a novel approach to the compression of sparse histogram images is proposed. First, we define a sparsity index which gives hints on the relationship between the mathematical concept of matrix sparsity and the visual information of pixel distribution. We use this index to better understand the scope of our approach and its preferred field of applicability, and to evaluate the perfor...

This paper proposes a “privacy conscious” video communication system utilizing core technology of the JPEG2000 international standard for digital image data compression. The system works not only as a conventional video communication tool but also serves as an “awareness communication” tool. In addition, bit rate for transmitting video data and hardware complexity of the system are also reduced...