International Symposium on VIPromCom Video/Image Processing and Multimedia Communications
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Các bài báo tiêu biểu
Multimedia application for teaching and learning telecommunication protocols
- Trang 31-34
In this paper we describe a multimedia presentation, which is designed as multimedia application for teaching and explaining principles of telecommunication protocols. The ISDN User Adaptation protocol for establishing an ISDN call connection through an IP network is presented The IUA protocol supports transport of Q.921 primitives from an ISDN network through an IP network. The designed presentat......
#Education #ISDN #IP networks #Transport protocols #Switches #Application specific processors #Application software #Motion pictures #Joining processes #Telecommunication switching
Applications of group signatures to anonymous fingerprinting schemes
- Trang 177-182
A group signature scheme allowed a group member to sign messages anonymously on behalf of the group. Fingerprinting schemes enable a merchant to identify the buyer of an illegally distributed digital good by providing each buyer with a slightly different version. An anonymous fingerprinting scheme allows the buyer to purchase goods without revealing her identity to the merchant. We propose an effi......
#Fingerprint recognition #Public key #Protocols #Security #Identity management systems #Mathematics #Electronic mail #Copyright protection #Region 8 #Image processing
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
Use of area-closing to improve granulometry performance
- Trang 303-308
We present a new procedure for computing the granulometry function. Computation of granulometry is normally done by morphological opening/closing performed on an image with structuring elements of increasing size. This can pose problems, if pixels within the image components are not nearly uniform gray level (or have large variations) or if there are patches within the objects of interest. The pro......
#Shape #Red blood cells #Diseases #Image processing #Cells (biology) #Morphology #Object detection #Humans #Visual system #Image recognition
A drift compensation architecture for DCT-pyramid video coding
- Trang 315-318
A new-layered video coding scheme is proposed for efficient spatial scalability based on the DCT pyramid. The proposed scheme is introduced to eliminate the drift error associated with reduced resolution video. A new algorithm to predict the motion vector of the reduced resolution video from the higher resolution motion vectors is presented. Based on simulation results, the proposed scheme achieve......
#Video coding #Discrete cosine transforms #Scalability #Spatial resolution #Bit rate #Motion compensation #Frequency #Video compression #Bandwidth #Decoding
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
The digital image transmission simulation by the model of the digital transmission channel
- Trang 401-406
The contribution deals with the simulation of non-compressed digital image transmission by a model of the digital transmission channel in baseband. The transmitted digital image corresponds to the CCIR ITU R-601 recommendation that is set up as a standard in digital video broadcasting baseband image processing. The channel is modelled as a digital filter with variable parameters and type of the ch......
#Digital images #Digital video broadcasting #Digital TV #Baseband #Image sampling #Chromium #Mathematical model #Image coding #Image processing #Satellite broadcasting
PCA applied to neural internal representation of input data - application to face recognition
- Trang 65-68
An original method of feature extraction from image data is introduced using MLP (multilayer perceptron) and PCA (principal component analysis). This method is used in a human face recognition system and results are compared to a face recognition system using PCA directly and to a system with direct classification of input images by MLP.
#Principal component analysis #Face recognition #Multilayer perceptrons #Eigenvalues and eigenfunctions #Neurons #Feature extraction #Image databases #Testing #Neural networks #Information technology
Image quality evaluation
- Trang 133-136
This paper is devoted to subjective and objective tests of image quality. The images were processed using different compressing algorithms (JPEG, KLT, Lura-wavelet) with compression ratio up to 100. After decompression they were tested on the quality changes. At first the subjective image quality test (DSCQS) was used. Then the objective quality test using the metric based on the human visual syst......
#Image quality #Image coding #Testing #Humans #Visual system #Video compression #Transform coding #Karhunen-Loeve transforms #Bit rate #PSNR
Internet-TV convergence in DVB-MHP
- Trang 447-451
In last decade, we have seen the first steps to the end of passive television. Digital technology is mature enough to enhance traditional TV (limited to content reproduction) with computing capability to run multimedia software integrating richer formats. One step further, Internet access through television is becoming a real possibility. The MHP standard is the first one that tries to define regu......
#Internet #Convergence #Digital video broadcasting #Application software #Digital TV #Multimedia communication #Multimedia systems #Hardware #Java #Multimedia computing