Extrapolation of a MPEG1 video-coding scheme for low-bit-rate applications
Miguel Roser, Paulo Villegas, L. Casamayou, Javier C. Caballero, María Simón · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1993
The state of the art in video coding at constant bit rates of up to about 1.5 Mbit/s is represented by the MPEG1 recommendation. Interest in low bitrate applications is coming from mobile applications, from storage media limitations and from transmission over subscriber copper loops. In this paper the ability of the MPEG1 standard to work at low bit rates, extrapolating it out of its design range is studied. A statistical analysis at bit level of the information generated by a compatible MPEG1 scheme is performed. The aim of this study is to obtain statistical results of the bit distribution in order to find out how the scheme spends the bits. This information will give us essential knowledge to decide in which modules it is possible to obtain a bit rate saving. A study of the motion vector search range reduction of a compatible MPEG1 scheme is also done. Simulations have been done by using a simulator written in 'C' language. A video tape with the simulation has been produced.