Data encoding apparatus, data decoding apparatus and methods thereof

TL;DR: In this article, a data group consisting of a first consecutive data and a second consecutive data adjacent to it is converted into an intermediate data by selecting a selected encoding method among a plurality of encoding methods, based on where a beginning of the data group corresponding to the intermediate data exists in the input data.

Abstract: a In a data encoding apparatus, an acquisition unit acquires an input data including a plurality of arranged data. A conversion unit searches a data group including a first consecutive data and a second data adjacent to the first consecutive data, each data of the first consecutive data having a first value and the second data having a second value, and converts the data group into an intermediate data. A selection unit selects a selected encoding method among a plurality of encoding methods, at a time of encoding the intermediate data based on where a beginning of the data group corresponding to the intermediate data exists in the input data. An encoding unit can encode the intermediate data by using the selected encoding method.