A variable bit rate encoding method for JPEG2000 is presented. The method is suitable for encoding digital cinema content. All bit rate constraints described in the DCI Digital Cinema System Specification are satisfied. At the same time, average peak signal-to-noise ratio is maximized subject to these constraints. The encoder first creates high rate codestreams that satisfy the constraints. The...

We demonstrate the use of a Diierential Vector Quantization (DVQ) architecture for the coding of digital images. An Artiicial Neural Network (ANN) is used to develop entropy-biased codebooks which yield substantial data compression without entropy coding and are very robust with respect to transmission channel errors. We discuss how these codebooks can be used to realize variable bit-rate coder...

In this paper, we present a variable bit rate control method for speech/audio coding, under the constraint that the total bit rate of a super-frame to be a constant. The proposed method uses a trellis diagram for optimizing the overall quality of the super-frame. In order to reduce the computational complexity, the trellis diagram uses approximation by ignoring the encoder memory state between ...

section, leading to the introduction of our proposed variable bit rate system. After some coverage of the performance of the system with a standard linear predictor, we introduce a Kalman predictor, and show an approach to reduce the computational complexity. We discuss the use of perceptual weighting within the system, and bit error resynchronization for the Arithmetic Coding (AC) data stream....

The efficient transmission of variable-bit-rate (VBR) video streams is complicated by the burstiness that video compression standards such as MPEG introduce. Most of the existing techniques concentrate on stored video traffic smoothing or real-time video traffic smoothing. However, there is a growing number of live video applications, such as video-casts of courses or television news, where man...

Motion description of objects time evolution is often bit-rate wasting even if computed at a low fixed ffame rate. Bit-rate reduction can be achieved taking advantage of the inactivity periods: in such time intervals there is no need for motion coding, as an accurate description of the scene can be obtained only considering the frame diflerence information. We propose to estimate the motion bet...