Lossless Compression
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Sistema de alto desempenho para compressão sem perdas de imagens mamográficas
The usage of mammographic image databases in digital form and the practice of telemedicine require to store and to transmit large amounts of data. The image digitization from a single mammographic exam with appropriate resolution can take up to 120MB of space in disk, which becomes even more critical when considering the large number of exams per day on a cl
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/04/2010
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2. Acopladores direcionais de fibras Ãpticas com perfis de dispersÃo / Directional optic staple dispersion profile fiber(DPF)
We present a numerical investigation of the propagation and the switching of fundamental solitons in a two-core nonlinear fiber coupler constructed with Dispersion Profile Fiber (DPF). We have shown that appropriate shaping of the DPF profile is quite effective to recover, almost completely, the original switching behavior associated to the lossless situatio
Publicado em: 2007
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3. Compressão Seletiva de Imagens Coloridas com Detecção Automática de Regiões de Interesse
There has been an increasing tendency on the use of selective image compression, since several applications make use of digital images and the loss of information in certain regions is not allowed in some cases. However, there are applications in which these images are captured and stored automatically making it impossible to the user to select the regions o
Publicado em: 2006
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4. MATHEMATICAL AND EXPERIMENTAL APPROACHES IN SHAPE-ADAPTATIVE VIDEO CODING / ABORDAGENS MATEMÁTICAS E EXPERIMENTAIS EM CODIFICAÇÃO DE VÍDEO ADAPTATIVA À FORMA
This thesis investigates shape adaptative coding of arbitrarily shaped segments. The texture and contour coding efficiency is discussed and solutions to tackle the associated problems are proposed. The presented methods are evaluated using standard image sequences. A mathematical approach for shape-adaptative transforms using linear operators is developed, f
Publicado em: 2000
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5. UNIVERSAL LOSSLESS DATA COMPRESSION WITH FINITE STATE ENCODERS / COMPRESSÃO DE DADOS VIA CODIFICADORES UNIVERSAIS, DE ESTADO FINITO E SEM PERDA DE INFORMAÇÃO
In this work the problem of data compression by finite- state and information lossless encorders is studied. The problem is divided in three parts: compression of individual sequences, compression of pairs of sequences and compression of images. For each of these, a lower bound is defined which sets a limit on the smaller compression rate that can be achieve
Publicado em: 1996
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6. A cryptologic based trust center for medical images.
OBJECTIVE: To investigate practical solutions that can integrate cryptographic techniques and picture archiving and communication systems (PACS) to improve the security of medical images. DESIGN: The PACS at the University of California San Francisco Medical Center consolidate images and associated data from various scanners into a centralized data archive a