ENCODING APPARATUS, DECODING APPARATUS, ENCODING METHOD, DECODING METHOD

摘要

An encoding apparatus, comprising: a picture element memory for receiving and storing a picture element having a value within a predetermined range as an encoding picture element, and for outputting a value of an encoded picture element adjacent to the encoding picture element as the value of a reference picture element; a mode determinator for selecting one of a specific encoding mode and an encoding mode other than the specific encoding mode from a plurality of predefined encoding modes for the encoding picture element based on the value of the reference picture element; a first encoding section for predicting the value of the encoding picture element, determining whether the prediction is correct, encoding the value of the encoding picture element based on a result of the determination, and for outputting a codeword for the encoding picture element; a second encoding section for predicting the value of the encoding picture element, encoding the value of the encoding picture element, and for outputting a codeword for the encoding picture element; and an encoding controller for selectively operating said first encoding section and said second encoding section based on a selected result of said mode determinator.