SIGNAL ENCODING AND DECODING SYSTEM

An encoding/decoding system is disclosed which comprises an analyzing encoder, a synthesizing decoder, two knowledge databases and two dynamic codebooks. The two databases are connected to the encoder and decoder respectively and store three-dimensional model data of feature images, shape and position information of elements of the feature images. The codebooks are connected to the encoder and decoder respectively and store luminance information of polygons such luminance information that the corresponding polygon seldom appears is eliminated. When a new polygon appears, the encoder encodes the luminance data of the polygon to transmit and gets the data in the codebook, and when any luminance data relative to a vector have been stored in the codebook, the encoder transmits the address of the vector.