KEYWORDS: Video, Distortion, Mathematical modeling, Computer programming, Video coding, Multimedia, Image quality, Image enhancement, Eye models, Signal to noise ratio
In recent years, along with the development of computer technology, compression technology and network technology, how to efficiently transmit multimedia information over network has become a main concern by industry and research institution. MPEG-4 FGS technology is introduced and the rate allocation optimizing problem during MPEG-4 FGS bitsream streaming over network is analyzed. In order to performing rate allocation, the rate-distortion function of FGS enhancement layer should be known, so this paper firstly analyzes the rate-distortion function. Secondly, several objectives that the rate allocation should meet are pointed out. Finally, two rate allocation optimizing models are proposed: constant distortion model and minimum distortion model, and the corresponding mathematic expressions are given. The result revealed that the two optimizing models are different, and they can be selected according to different network variance conditions.
Based on analysis of the working principle of ICCD imaging system, the paper develops a new testing system for synthetic performance of ICCD imaging system. With the help of this testing system for integrative performance and the theory of Weibull psychometric function, a new method for MRC measurement of Space Light Modulation (SLM) is proposed, and the paper firstly implements measurement for minimum resolvable contrast performance of ICCD imaging system. The method provides reference for MRC performance measurement of other imaging system.
View range is one of the main integrated performance indexes, and is also the important performance index needed to give when night view systems leave factory. A new objective view range evaluation method for night view system is proposed in this paper by using image processing technology, data fit, vision sense formula under glimmer light circumstance and other knowledge. With the help of the method, the paper has carried out four groups' experimentation with field situation of four kind's night view system. The result of view range calculation indicates that the new method not only has effectively improved the speed of view range measurement for night view system, but also possesses good precision and practicability.
MPEG-4, with its superior compression, interactivity and universal access, is the most promising future standard. MPEG-4 relies on a content-based representation so it can provide new functionalities such as content-based interactivity and scalability. Content-based coding, which encodes the objects within a picture, is one ofthe most important functionalities proposed by MPEG-4, and it has attracted considerable attention. Moreover, encoding the texture ofan arbitrarily shaped object is an important part ofobject-based coding. Therefore, many researchers have being trying their best to solve this problem, and they proposed various methods to encode the texture ofan arbitrarily shaped object. In this paper, we summarize several methods of arbitrarily shaped object coding including SA-DCT (Shape Adapted-DCT), EA-DCT (Expanded Arbitrary-Shaped DCT), Mean Replacement Padding and Low Pass Extrapolation Method (LPE). We also propose two new padding method ofarbitrarily shaped object coding. Experimental results showed that the proposed methods have almost the same effect as LPE method, which MPEG-4 has adopted, so that it can improve the coding efficiency of DCT.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.