Scene context dependent rate control

To prevent the loss of the information embedded in the generated variable bit rate data that is transmitted over a constant bit rate channel, several methods were proposed in MPEG TMN5, H.263 TMN5, and TMN8. In these methods, the quantity of coded data is controlled by adjusting the coding parameters according to the amount of data remaining in the buffer. Because this control is based on the past coded information and does not reflect the nature of the image being coded, there is no assurance that sufficient image quality will be obtained. In this paper, we present a Scene Context Dependent coding scheme to control the generated variable bit rate data over a constant bit rate channel for non real-time video applications and show the improvements over the encoding using the TMN H263 codec. This can be considered as a method to control the bit rate in accordance with the characteristics of human visual perception using the combination of feedforward control, feed-backward control, and model-based approaches.