…Data compression is a type of encoding, and is sometimes called source encoding or high-efficiency encoding. Data compression is broadly classified into two types: lossless compression, which compresses data so that the original data (bit string) can be perfectly reproduced when restored, and lossy compression, which compresses data so that only the necessary information can be restored. Although lossy compression has a greater compression effect, lossless compression is essential when compressing text data, program executable files, etc. … *Some of the terminology that refers to "lossless encoding" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…データ圧縮は符号化の一種であり,情報源符号化や高能率符号化と呼ばれることもある。 データ圧縮は復元したときに元のデータ(ビット列)を完全に再現できるように圧縮する無歪み圧縮(可逆符号化,lossless compression)と必要な情報だけを復元できるように圧縮する歪みありの圧縮(非可逆符号化,lossy compression)の二つに大きく分類される。歪みありの圧縮の方が圧縮効果は大きいが,テキストデータやプログラムの実行ファイルなどの圧縮では無歪みであることが必須となる。… ※「可逆符号化」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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