International Symposium on VIPromCom Video/Image Processing and Multimedia Communications
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Các bài báo tiêu biểu
How accurate should be disparities estimated for image-based rendering?
- Trang 69-74
Disparity estimation is the basis for the generation of a virtual view from a small set of real reference images. Much research on this area has been conducted by the computer vision community over the last decade. Currently, most problems involved in this technology are well understood and there exist several well-established algorithms to render virtual views from perspectively different images ......
#Rendering (computer graphics) #Layout #Computer vision #Application software #Geometry #Computational efficiency #Solid modeling #Image generation #Computer graphics #Augmented reality
Combating geometrical attacks in a DWT based blind video watermarking system
- Trang 263-266
This paper describes a high capacity blind video watermarking system invariant to geometrical attacks such as shift, rotation, scaling and cropping. A spatial domain reference watermark is used to obtain invariance to geometric attacks by employing image registration techniques to determine and invert the attacks. A second, high capacity watermark, which carries the data payload, is embedded in th......
#Discrete wavelet transforms #Watermarking #Image registration #Payloads #Wavelet domain #Humans #Visual system #Protection #Error correction codes #Turbo codes
An approach to directional wavelet construction and their use for image compression
- Trang 201-204
In this paper we construct a new type of directional wavelet transform based on the lifting scheme and quincunx sampling. Based on known separable wavelet predictors we build nonseparable 2D wavelet predictors with directional properties. As example we use the resulting wavelet transform for image compression for motion blurred images.
#Image coding #Wavelet transforms #Lattices #Filter bank #Image sampling #Digital signal processing #Signal processing algorithms #Frequency #Information technology #Signal sampling
Speckle suppression by adaptive nonlinear filtering
- Trang 163-166
Using a good statistical model of speckle formation is important in designing an adaptive filter for speckle reduction in ultrasound B-scan images. Most clinical ultrasound imaging systems use a nonlinear logarithmic function to reduce the dynamic range of the input echo signal and emphasize objects with weak backscatter. The statistic of log-compressed images for Nakagami distribution was derived......
#Speckle #Adaptive filters #Ultrasonic imaging #Filtering #Dynamic range #Backscatter #Statistical distributions #Nakagami distribution #Nonlinear filters #Liver
Tracking moving objects with co-evolutionary snakes
- Trang 325-332
A new symbiotic genetic algorithm (SGA) based active contour model (snake) is proposed to track the B-spline contour of obstacles. It exploits the local control properties of the B-spline to decompose the contour into subcontours and optimizes each subcontour in separate genetic algorithms (GA). Unlike the GA-based snake, an SGA snake can track the obstacle's outline more robustly. Application-spe......
#Spline #Genetic algorithms #Symbiosis #Active contours #Deformable models #Shape control #Noise robustness #Robust stability #Control system synthesis #Combinatorial mathematics
Hybrid N-feature extraction with fuzzy integral in human face recognition
- Trang 93-98
This paper introduces an efficient method for human face recognition that employs a set of different kinds of feature domains with RBF neural network classifiers, and which is denoted the hybrid N-feature (HNF) human face recognition. A combination of RBF neural network classifiers with fuzzy integral has been proposed to achieve face classification with higher performance. The feature extractor p......
#Humans #Face recognition #Neural networks #Fuzzy neural networks #Feature extraction #Data mining #Face detection #Fuzzy systems #Principal component analysis #Discrete cosine transforms
Simplified Boolean LUM smoothers
- Trang 159-162
The field of the research related to the implementation of nonlinear order-statistic filters through their equivalent expression by positive Boolean functions (PBF) lies in the conversion between the traditional filtering functions and their corresponding PBF. In the case of the order-statistic LUM smoothers, the complexity of minimal PBF depends on a smoothing parameter and window size. In order ......
#Filters #Smoothing methods #Statistics #Filtering #Multimedia communication #Boolean functions #Electronic mail #Attenuation #Stacking #Region 8
Motion compensated multimode video coding for noisy channels
- Trang 279-282
Images with rapid motion are more or less degraded at low bit rate transmission. Hence a motion compensation technique is implemented to improve the coding efficiency. Performance in terms of bit rate is compared between motion compensated and nonmotion-compensated multimode video coding. Multimode video coding optimizes the tradeoff between the conflicting objectives of high compression ratio and......
#Video coding #Motion estimation #Motion compensation #Videoconference #Video compression #Bit rate #Image coding #Video sequences #Degradation #Resilience
Modified BTC algorithm for satellite image coding
- Trang 212-215
BTC (block truncation coding) codes and their variations are lost-block codes often used in narrowband systems with a lower sensitivity for transported picture impairment. Our preferred modification of these codes goes to better compression with a very low picture impairment against original BTC methods. The modification uses the convenience of low-level changes of successive pictures, which are i......
#Satellites #Image coding #Information technology #Narrowband #Quantization #Hardware #Shape #Standards development #Block codes #Decoding
Performance of the all-optical packet switch in the WAN and MAN networks
- Trang 387-390
In this paper, we provide a simulation-based study on the performance of the synchronous all-optical packet switch especially the impact of the contention resolution mechanism on the PLR in the synchronous all-optical network.
#Packet switching #Intelligent networks #Wide area networks #Optical switches #Optical network units #Optical packet switching #All-optical networks #Payloads #Optical feedback #Optical fiber networks