Author: Robert E. Van DyckPublisher:
ISBN:
Category :
Languages : en
Pages : 398
Book Description
Subband-vector Quantization Coding of Color Images with Perceptually Optimal Bit Allocation
Author: Robert E. Van DyckVector Quantization in Subband Coding of Images
Author: Saad John BedrosSub-band coding of images using inter-band vector quantization
Author: Publisher:
ISBN:
Category :
Languages : pt-BR
Pages :
Book Description
Neste trabalho são examinados métodos de codificação de imagens em sub-bandas utilizando quantização vetorial inter-bandas para faixas abaixo de 1 bit/pixel. O espectro de freqüências da imagem é decomposto em 16 sub-bandas uniformes através de um banco de filtros espelhados em quadratura bi-dimensionais. As amostras dos sinais das 16 sub-bandas são usadas para compor um vetor de 16 componentes que, posteriormente, é codificado por um esquema de quantização vetorial (QV). Com o objetivo de reduzir a complexidade e o espaço de memória, são investigadas duas estruturas de quantização vetorial. Uma delas utiliza QV particionada, com o objetivo não só de reduzir a complexidade, como também de explorar as propriedades espectrais. A outra realiza a quantização vetorial direta, enquanto a complexidade é reduzida significativamente. Resultados de simulações são apresentados para as taxas de 0,50 bit/pixel, 0,63 bit/pixel e 0,75 bit/pixel. Uma análise comparativa mostra que o desempenho dos dois esquemas é comparável ao que utiliza quantização vetorial direta, enquanto a complexidade é reduzida significativamente. Resultados de simulações mostram ainda que, a taxas abaixo de 1 bit/pixel, não é recomendável o uso de QV inter-bandas particionada com alocação de bits adaptativa, nem de QV inter-bandas multi-estágios com busca em árvore. A técnica QV inter-bandas quando a sub-banda dominante é codificada separadamente através de um quantizador vetorial intra-banda. Considera-se a decomposição do espectro de freqüências em 16 sub-bandas uniformes e em 13 sub-bandas. Para a decomposição em 16 sub-bandas, esse esquema apresenta desempenho comparável à QV inter-bandas direta e complexidade equivalente à QV inter-bandas multi-estágios.
Subband Image Coding
Author: John W. WoodsPublisher: Springer Science & Business Media
ISBN: 1475721196
Category : Technology & Engineering
Languages : en
Pages : 365
Book Description
This book concerns a new method of image data compression which weil may supplant the well-established block-transfonn methods that have been state-of-the art for the last 15 years. Subband image coding or SBC was first perfonned as such in 1985, and as the results became known at first through conference proceedings, and later through journal papers, the research community became excited about both the theoretical and practical aspects of this new approach. This excitement is continuing today, with many major research laboratories and research universities around the world investigating the subband approach to coding of color images, high resolution images, video- including video conferencing and advanced tele vision, and the medical application of picture archiving systems. Much of the fruits of this work is summarized in the eight chapters of this book which were written by leading practitioners in this field. The subband approach to image coding starts by passing the image through a two- or three-dimensional filter bank. The two-dimensional (2-D) case usually is hierarchical' consisting of two stages of four filters each. Thus the original image is split into 16 subband images, with each one decimated or subsampled by 4x4, resulting in a data conservation. The individual channel data is then quantized ·for digital transmission. In an attractive variation an octave-like approach, herein tenned subband pyramid, is taken for the decomposition resulting in a total of just eleven subbands.
Advances in Wavelet Theory and Their Applications in Engineering, Physics and Technology
Author: Dumitru BaleanuPublisher: BoD – Books on Demand
ISBN: 9535104942
Category : Computers
Languages : en
Pages : 650
Book Description
The use of the wavelet transform to analyze the behaviour of the complex systems from various fields started to be widely recognized and applied successfully during the last few decades. In this book some advances in wavelet theory and their applications in engineering, physics and technology are presented. The applications were carefully selected and grouped in five main sections - Signal Processing, Electrical Systems, Fault Diagnosis and Monitoring, Image Processing and Applications in Engineering. One of the key features of this book is that the wavelet concepts have been described from a point of view that is familiar to researchers from various branches of science and engineering. The content of the book is accessible to a large number of readers.
Subband Image Coding Using Vector Quantization
Author: Yan Huat SimPublisher:
ISBN:
Category : Image processing
Languages : en
Pages : 192
Book Description
Enhancing the Power of the Internet
Author: Masoud NikraveshPublisher: Springer
ISBN: 3540452184
Category : Technology & Engineering
Languages : en
Pages : 407
Book Description
This book presents reports from the forefront of soft computing in the Internet industry and covers important topics in the field such as search engines, fuzzy query, decision analysis and support systems as well as e-business and e-commerce.
Towards Perceptually Optimal Coding of Color Images Using Subband Transforms
Author: Evgeny GershikovDissertation Abstracts International
Author: Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 860
Book Description
Applications of Digital Image Processing XVI
Author: Andrew G. TescherPublisher:
ISBN:
Category : Computers
Languages : en
Pages : 424
Book Description