[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/all2jp\/wiki47\/archives\/15434#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/all2jp\/wiki47\/archives\/15434","headline":"LZ78-\u30a6\u30a3\u30ad\u30da\u30c7\u30a3\u30a2\u3001\u7121\u6599\u200b\u200b\u767e\u79d1\u4e8b\u5178","name":"LZ78-\u30a6\u30a3\u30ad\u30da\u30c7\u30a3\u30a2\u3001\u7121\u6599\u200b\u200b\u767e\u79d1\u4e8b\u5178","description":"before-content-x4 LZ78 &#8211; \u5b89\u5b9a\u3057\u305f\u30c7\u30fc\u30bf\u5727\u7e2e\u306e\u8f9e\u66f8\u65b9\u6cd5\u3002 1978\u5e74\u306bJa&#8217;ak\u00f3wZiwa\u3068Awraham Lempel\u306b\u3088\u3063\u3066\u958b\u767a\u3055\u308c\u3001 \u60c5\u5831\u7406\u8ad6\u306b\u95a2\u3059\u308bIEEE\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3 \u3001w artykule pt\u3002 \u300c\u53ef\u5909\u30ec\u30fc\u30c8\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u4ecb\u3057\u305f\u500b\u3005\u306e\u914d\u5217\u306e\u5727\u7e2e\u300d\uff08s\u3002530\u2013536\uff09\u3002 after-content-x4 \u5727\u7e2e\u306f\u3001\u30b7\u30f3\u30dc\u30eb\u306e\u6587\u5b57\u5217\u3092\u3001\u4ee5\u524d\u306b\u5727\u7e2e\u30c7\u30fc\u30bf\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u305f\u30b7\u30f3\u30dc\u30eb\u306e\u6587\u5b57\u5217\u3092\u4fdd\u5b58\u3059\u308b\u8f9e\u66f8\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u308c\u306e\u304a\u304b\u3052\u3067\u3001\u30b7\u30f3\u30dc\u30eb\u306e\u7e70\u308a\u8fd4\u3057\u306e\u6587\u5b57\u5217\uff08\u305f\u3068\u3048\u3070\u3001\u30c6\u30ad\u30b9\u30c8\u5185\u306e\u540c\u3058\u5358\u8a9e\u307e\u305f\u306f\u30d5\u30ec\u30fc\u30ba\uff09\u306f\u3001\u306f\u308b\u304b\u306b\u77ed\u3044\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff08\u6570\u5b57\uff09\u306b\u7f6e\u304d\u63db\u3048\u3089\u308c\u307e\u3059\u3002 1\u5e74\u524d\u306eLZ78\u306e\u8457\u8005\u306f\u3001\u8f9e\u66f8\u304c\u6c38\u7d9a\u7684\u3067\u3042\u308bLZ77\u30e1\u30bd\u30c3\u30c9\u3092\u958b\u767a\u3057\u3001\u305d\u306e\u7d50\u679c\u3001\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u306e\u6d41\u308c\u3067\u305d\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u5e38\u306b\u5909\u5316\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001\u5f7c\u304c\u4ee5\u524d\u306b\u6f14\u594f\u3057\u3066\u3044\u305f\u5165\u308a\u53e3\u3067\u5f26\u304c\u7e70\u308a\u8fd4\u3055\u308c\u305f\u304c\u3001\u5f7c\u306f\u8f9e\u66f8\u306b\u3053\u308c\u4ee5\u4e0a\u3044\u306a\u304b\u3063\u305f\u5834\u5408\u3001\u5f7c\u306f\u518d\u3073\u8a18\u61b6\u3055\u308c\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002 \u4e00\u822c\u306b\u3001LZ78\u30e1\u30bd\u30c3\u30c9\u306fLZ77\u306b\u975e\u5e38\u306b\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u8f9e\u66f8\u304c\u5916\u90e8\u3067\u3042\u308a\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u62e1\u5f35\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u9664\u3044\u3066\u3001\u51e6\u7406\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u6587\u5b57\u5217\u306f\u5931\u308f\u308c\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u500b\u3005\u306e\u5358\u8a9e\u3078\u306e\u30a2\u30af\u30bb\u30b9\u901f\u5ea6\u306b\u3088\u308a\u3001\u8f9e\u66f8\u3078\u306e\u8907\u96d1\u306a\u30a2\u30af\u30bb\u30b9\u3092\u72a0\u7272\u306b\u3057\u3066\u3001\u3088\u308a\u826f\u3044\u5727\u7e2e\u4fc2\u6570\u304c\u53d6\u5f97\u3055\u308c\u307e\u3059\u3002\u30c4\u30ea\u30fc\uff08\u30d0\u30a4\u30ca\u30ea\u3001\u30c8\u30ea\uff09\u307e\u305f\u306f\u30cf\u30c3\u30b7\u30e5\u3068\u3057\u3066\u5b9f\u88c5\u3055\u308c\u307e\u3059\u3002 after-content-x4 \u3053\u306e\u65b9\u6cd5\u306e\u5927\u304d\u306a\u5229\u70b9\u306f\u3001\u4e00\u822c\u7684\u306b\u6f5c\u5728\u7684\u306b\u975e\u5e38\u306b\u5927\u304d\u306a\u8f9e\u66f8\u304c \u899a\u3048\u3066\u304a\u304f\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093 &#8211; \u30b3\u30fc\u30c9\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u3044\u3066\u30c7\u30b3\u30fc\u30c0\u30fc\u306b\u3088\u3063\u3066\u518d\u73fe\u3055\u308c\u307e\u3059\uff08\u6e1b\u5727\u306e\u4f8b\u3092\u53c2\u7167\uff09\u3002\u305f\u3060\u3057\u3001\u4e0d\u5229\u306a\u70b9\u306f\u3001\u30b3\u30fc\u30c9\u3068\u6e1b\u5727\u306e\u5b9f\u8cea\u7684\u306b\u540c\u3058\u8907\u96d1\u3055\u3067\u3059\u3002","datePublished":"2019-06-01","dateModified":"2019-06-01","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/all2jp\/wiki47\/archives\/author\/lordneo#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/all2jp\/wiki47\/archives\/author\/lordneo","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/44a4cee54c4c053e967fe3e7d054edd4?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/44a4cee54c4c053e967fe3e7d054edd4?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/wikimedia.org\/api\/rest_v1\/media\/math\/render\/svg\/4611d85173cd3b508e67077d4a1252c9c05abca2","url":"https:\/\/wikimedia.org\/api\/rest_v1\/media\/math\/render\/svg\/4611d85173cd3b508e67077d4a1252c9c05abca2","height":"","width":""},"url":"https:\/\/wiki.edu.vn\/all2jp\/wiki47\/archives\/15434","wordCount":4824,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4LZ78  &#8211; \u5b89\u5b9a\u3057\u305f\u30c7\u30fc\u30bf\u5727\u7e2e\u306e\u8f9e\u66f8\u65b9\u6cd5\u3002 1978\u5e74\u306bJa&#8217;ak\u00f3wZiwa\u3068Awraham Lempel\u306b\u3088\u3063\u3066\u958b\u767a\u3055\u308c\u3001 \u60c5\u5831\u7406\u8ad6\u306b\u95a2\u3059\u308bIEEE\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3 \u3001w artykule pt\u3002 \u300c\u53ef\u5909\u30ec\u30fc\u30c8\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u4ecb\u3057\u305f\u500b\u3005\u306e\u914d\u5217\u306e\u5727\u7e2e\u300d\uff08s\u3002530\u2013536\uff09\u3002        (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4\u5727\u7e2e\u306f\u3001\u30b7\u30f3\u30dc\u30eb\u306e\u6587\u5b57\u5217\u3092\u3001\u4ee5\u524d\u306b\u5727\u7e2e\u30c7\u30fc\u30bf\u306b\u8868\u793a\u3055\u308c\u3066\u3044\u305f\u30b7\u30f3\u30dc\u30eb\u306e\u6587\u5b57\u5217\u3092\u4fdd\u5b58\u3059\u308b\u8f9e\u66f8\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u308c\u306e\u304a\u304b\u3052\u3067\u3001\u30b7\u30f3\u30dc\u30eb\u306e\u7e70\u308a\u8fd4\u3057\u306e\u6587\u5b57\u5217\uff08\u305f\u3068\u3048\u3070\u3001\u30c6\u30ad\u30b9\u30c8\u5185\u306e\u540c\u3058\u5358\u8a9e\u307e\u305f\u306f\u30d5\u30ec\u30fc\u30ba\uff09\u306f\u3001\u306f\u308b\u304b\u306b\u77ed\u3044\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff08\u6570\u5b57\uff09\u306b\u7f6e\u304d\u63db\u3048\u3089\u308c\u307e\u3059\u3002 1\u5e74\u524d\u306eLZ78\u306e\u8457\u8005\u306f\u3001\u8f9e\u66f8\u304c\u6c38\u7d9a\u7684\u3067\u3042\u308bLZ77\u30e1\u30bd\u30c3\u30c9\u3092\u958b\u767a\u3057\u3001\u305d\u306e\u7d50\u679c\u3001\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u306e\u6d41\u308c\u3067\u305d\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u5e38\u306b\u5909\u5316\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u7d50\u679c\u3001\u5f7c\u304c\u4ee5\u524d\u306b\u6f14\u594f\u3057\u3066\u3044\u305f\u5165\u308a\u53e3\u3067\u5f26\u304c\u7e70\u308a\u8fd4\u3055\u308c\u305f\u304c\u3001\u5f7c\u306f\u8f9e\u66f8\u306b\u3053\u308c\u4ee5\u4e0a\u3044\u306a\u304b\u3063\u305f\u5834\u5408\u3001\u5f7c\u306f\u518d\u3073\u8a18\u61b6\u3055\u308c\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002 \u4e00\u822c\u306b\u3001LZ78\u30e1\u30bd\u30c3\u30c9\u306fLZ77\u306b\u975e\u5e38\u306b\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u8f9e\u66f8\u304c\u5916\u90e8\u3067\u3042\u308a\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u62e1\u5f35\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u9664\u3044\u3066\u3001\u51e6\u7406\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u6587\u5b57\u5217\u306f\u5931\u308f\u308c\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u500b\u3005\u306e\u5358\u8a9e\u3078\u306e\u30a2\u30af\u30bb\u30b9\u901f\u5ea6\u306b\u3088\u308a\u3001\u8f9e\u66f8\u3078\u306e\u8907\u96d1\u306a\u30a2\u30af\u30bb\u30b9\u3092\u72a0\u7272\u306b\u3057\u3066\u3001\u3088\u308a\u826f\u3044\u5727\u7e2e\u4fc2\u6570\u304c\u53d6\u5f97\u3055\u308c\u307e\u3059\u3002\u30c4\u30ea\u30fc\uff08\u30d0\u30a4\u30ca\u30ea\u3001\u30c8\u30ea\uff09\u307e\u305f\u306f\u30cf\u30c3\u30b7\u30e5\u3068\u3057\u3066\u5b9f\u88c5\u3055\u308c\u307e\u3059\u3002        (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4\u3053\u306e\u65b9\u6cd5\u306e\u5927\u304d\u306a\u5229\u70b9\u306f\u3001\u4e00\u822c\u7684\u306b\u6f5c\u5728\u7684\u306b\u975e\u5e38\u306b\u5927\u304d\u306a\u8f9e\u66f8\u304c \u899a\u3048\u3066\u304a\u304f\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093  &#8211; \u30b3\u30fc\u30c9\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u3044\u3066\u30c7\u30b3\u30fc\u30c0\u30fc\u306b\u3088\u3063\u3066\u518d\u73fe\u3055\u308c\u307e\u3059\uff08\u6e1b\u5727\u306e\u4f8b\u3092\u53c2\u7167\uff09\u3002\u305f\u3060\u3057\u3001\u4e0d\u5229\u306a\u70b9\u306f\u3001\u30b3\u30fc\u30c9\u3068\u6e1b\u5727\u306e\u5b9f\u8cea\u7684\u306b\u540c\u3058\u8907\u96d1\u3055\u3067\u3059\u3002 \u5b9f\u969b\u306b\u306f\u3001LZW\u3068\u547c\u3070\u308c\u308bLZ78\u30d0\u30ea\u30a2\u30f3\u30c8\u304c\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002 \u6587\u5b57\u5217\u304c\u5727\u7e2e\u3055\u308c\u3066\u3044\u307e\u3059 s {displaystyleS} \u542b\u3080        (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4n {displaystyle n} \u30b7\u30f3\u30dc\u30eb\u3002 \u8f9e\u66f8\u3092\u30af\u30ea\u30a2\u3057\u307e\u3059\u3002 \u79c1 \uff1a= 0 {displaystyle i\uff1a= 0} \uff08 \u79c1 {displaystyle i}  &#8211; \u6700\u521d\u306e\u3001\u672a\u51e6\u7406\u306e\u30b7\u30f3\u30dc\u30eb\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9 s {displaystyleS} \uff09\u3002 \u306b\u9650\u3063\u3066 \u79c1 < n \u3001 {displaystyle i \u5b9f\u884c\uff1a \u8f9e\u66f8\u3067\u691c\u7d22\u3057\u3066\u304f\u3060\u3055\u3044\u6700\u9577\u306eBeacha\u306f\u672a\u52a0\u5de5\u306e\u30b7\u30f3\u30dc\u30eb\u306e\u59cb\u307e\u308a\u306b\u7b49\u3057\u3044\uff08\u6392\u6c34 S[i\u2026]{displaystyleS [ildots]} \uff09\u3002 \u305d\u306e\u3088\u3046\u306a\u30d7\u30eb\u3092\u898b\u3064\u3051\u305f\u5834\u5408\u3001\u691c\u7d22\u306e\u7d50\u679c\u306f\u305d\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u3059 k{displaystyle k}\u8f9e\u66f8;\u3055\u3089\u306b\u3001\u3053\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u793a\u3055\u308c\u308b\u5358\u8a9e\u306f\u78ba\u304b\u3067\u3059 m.{displaystyle m.}\u7d42\u4e86\u3059\u308b\u306b\u306f\u3001\u30da\u30a2\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u6700\u521d\u306e\u4e0d\u4e00\u81f4\u306e\u30b7\u30f3\u30dc\u30eb\uff09\u3092\u66f8\u304d\u307e\u3059\u3002 k,{displaystyle k,} S[i+m]{displaystyle S[i+m]}\uff09\u305d\u3057\u3066\u8f9e\u66f8\u306b\u8ffd\u52a0\u3057\u3066\u3001\u30b7\u30f3\u30dc\u30eb\u306b\u62e1\u5f35\u3055\u308c\u305f\u5fae\u5999\u306a\u3082\u306e\u304c\u898b\u3064\u304b\u308a\u307e\u3057\u305f S[i+m]{displaystyle S[i+m]}\uff08\u8a00\u3044\u63db\u3048\u308c\u3070\u3001\u30d7\u30eb S[i\u2026i+m]{displaystyle S[ildots i+m]}\uff09\u3002\u5897\u52a0 i:=i+m.{displaystyle i:=i+m.}\u30c9\u30e9\u30d5\u30c8\u3092\u898b\u3064\u3051\u3089\u308c\u306a\u304b\u3063\u305f\u5834\u5408\u3001\u305d\u308c\u306f\u8f9e\u66f8\u306b\u307e\u3060\u30b7\u30f3\u30dc\u30eb\u304c\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059 S[i].{displaystyle S[i].}\u6b21\u306b\u3001\u3053\u306e\u8a18\u53f7\u304c\u8f9e\u66f8\u306b\u8ffd\u52a0\u3055\u308c\u3001\u84b8\u6c17\u304c\u66f8\u304d\u51fa\u3055\u308c\u307e\u3059\uff08 0,{displaystyle 0,} S[i]{displaystyle S[i]}\uff09\u3002\u3053\u3053\u3067\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b90\u306f\u5f93\u6765\u578b\u3067\u3059\u304c\u3001\u4e00\u822c\u7684\u306a\u5834\u5408\u306f\u3001\u8b58\u5225\u3055\u308c\u305f\u6570\u5b57\u306b\u3064\u3044\u3066\u3067\u3059\u3002\u5897\u52a0 i{displaystyle i}o 1\u3064\u3002 \u305f\u3060\u3057\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u8f9e\u66f8\u306b\u306f\u3042\u308a\u307e\u3059 \u9650\u3089\u308c\u305f\u30b5\u30a4\u30ba  &#8211; \u30b3\u30fc\u30c0\u30fc\uff08\u304a\u3088\u3073\u30c7\u30b3\u30fc\u30c0\u30fc\uff09\u306f\u3001\u8f9e\u66f8\u304c\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u3057\u3066\u3044\u308b\u3068\u3044\u3046\u4e8b\u5b9f\u306b\u7570\u306a\u3063\u3066\u53cd\u5fdc\u3057\u307e\u3059\u3002\u8f9e\u66f8\u306f\u6b21\u306e\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a \u30bc\u30ed; \u65b0\u3057\u3044\u5358\u8a9e\u306e\u8ffd\u52a0\u304c\u505c\u6b62\u3055\u308c\u3066\u3044\u307e\u3059\u3002 \u6700\u3082\u65e9\u304f\u8ffd\u52a0\u3055\u308c\u305f\u5358\u8a9e\u3002 \u6700\u3082\u983b\u7e41\u306b\u767a\u751f\u3059\u308b\u5358\u8a9e\u306f\u524a\u9664\u3055\u308c\u307e\u3059\u3002 \u30e6\u30cb\u30d0\u30fc\u30b5\u30eb\u30b3\u30f3\u30d7\u30ec\u30b9\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001\u8ffd\u52a0\u306e\u5358\u8a9e\u304c\u540a\u308a\u4e0b\u3052\u3089\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u5727\u7e2e\u4fc2\u6570\u304c\u7279\u5b9a\u306e\u30ec\u30d9\u30eb\u3092\u4e0b\u56de\u308b\u3068\u3001\u8f9e\u66f8\u306f\u30bc\u30ed\u306b\u306a\u308a\u307e\u3059\u3002 \u8f9e\u66f8\u3092\u30af\u30ea\u30a2\u3057\u307e\u3059\u3002 \u3059\u3079\u3066\u306e\u30ab\u30c3\u30d7\u30eb\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u30b7\u30f3\u30dc\u30eb &#8211;  k \u3001 {displaystyle k\u3001}  s {displaystyleS} \uff09 \u5b9f\u884c\uff1a \u3082\u3057\u3082 k=0,{displaystyle k = 0\u3001} \u30b7\u30f3\u30dc\u30eb\u3092\u8ffd\u52a0\u3057\u307e\u3059 s{displaystyleS} \u8f9e\u66f8\u306b\u3002\u30b7\u30f3\u30dc\u30eb\u3092\u51fa\u53e3\u306b\u66f8\u304d\u8fbc\u307f\u307e\u3059 s.{displaystyle s\u3002} \u3082\u3057\u3082 0,&#8221;>\u8f9e\u66f8\u304b\u3089\u5358\u8a9e\u3092\u53d6\u308a\u307e\u3059 w{displaystyle in} \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4e0b\u304b\u3089 k.{displaystyle k\u3002} \u51fa\u53e3\u306b\u5358\u8a9e\u3092\u66f8\u304d\u307e\u3059 w{displaystyle in} \u305d\u3057\u3066\u30b7\u30f3\u30dc\u30eb s.{displaystyle s\u3002} \u6b21\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4e0b\u306b\u3042\u308b\u8f9e\u66f8\u306b\u5358\u8a9e\u3092\u8ffd\u52a0\u3057\u307e\u3059 w+s.{displaystyle w+s\u3002} LZ78\u30e1\u30bd\u30c3\u30c9\u306f\u9577\u5e74\u306b\u308f\u305f\u3063\u3066\u6539\u5584\u3055\u308c\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001\u6700\u3082\u91cd\u8981\u306a\u5909\u66f4\u306e\u30ea\u30b9\u30c8\u3067\u3059\u3002 LZW\uff08Terry Welch\u30011984\uff09\u3001LZC\uff081985\uff09 &#8211;  LZW\u306e\u5b9f\u7528\u7684\u306a\u5b9f\u88c5 LZJ \uff08Matti Jakobson\u30011985\uff09 LZT \uff08J. Tischer\u30011987\uff09\u3001LZW\u4fee\u6b63 LZMW\uff081985\uff09\u3001LZAP\uff081988\uff09-LZW\u4fee\u6b63 \u6587\u5b57\u5217\u306f\u5727\u7e2e\u3055\u308c\u307e\u3059\uff1a abbbeabcbyaaaaac \u3002 \u30a8\u30f3\u30c8\u30ea \u51fa\u53e3 \u8f9e\u66f8 \u30b3\u30e1\u30f3\u30c8 \u7d22\u5f15 \u8a00\u8449 a \uff080\u3001 a \uff09\uff09 \u521d\u3081 a  \u8f9e\u66f8\u306b\u306f\u30b7\u30f3\u30dc\u30eb\u306f\u3042\u308a\u307e\u305b\u3093 a  b \uff080\u3001 b \uff09\uff09 2 b  \u8f9e\u66f8\u306b\u306f\u30b7\u30f3\u30dc\u30eb\u306f\u3042\u308a\u307e\u305b\u3093 b  BB \uff082\u3001 b \uff09\uff09 3 BB  \u8f9e\u66f8\u306b\u6587\u5b57\u5217\u304c\u3042\u308a\u307e\u3059 b \uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b92\uff09\u305f\u3060\u3057\u3001 BB ;\u30da\u30a2\u306f\u51fa\u53e3\uff08\u65e2\u5b58\u306e\u5358\u8a9e\u3001\u30b7\u30f3\u30dc\u30eb\uff09\u306b\u4fdd\u5b58\u3055\u308c\u3001\u8f9e\u66f8\u306b\u65b0\u3057\u3044\u5358\u8a9e\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059 BB  c \uff080\u3001 c \uff09\uff09 4 c  \u8f9e\u66f8\u306b\u306f\u30b7\u30f3\u30dc\u30eb\u306f\u3042\u308a\u307e\u305b\u3093 c  aa \uff08\u521d\u3081\u3001 a \uff09\uff09 5 aa  \u8f9e\u66f8\u306b\u6587\u5b57\u5217\u304c\u3042\u308a\u307e\u3059 a \uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b91\uff09\u305f\u3060\u3057\u3001 aa ;\u30da\u30a2\u306f\u51fa\u53e3\uff08\u65e2\u5b58\u306e\u5358\u8a9e\u3001\u30b7\u30f3\u30dc\u30eb\uff09\u306b\u4fdd\u5b58\u3055\u308c\u3001\u8f9e\u66f8\u306b\u65b0\u3057\u3044\u5358\u8a9e\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059 aa  BBC \uff083\u3001 c \uff09\uff09 6 BBC  \u8f9e\u66f8\u306b\u6587\u5b57\u5217\u304c\u3042\u308a\u307e\u3059 BB \uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b93\uff09\u305f\u3060\u3057\u3001 BBC ;\u30da\u30a2\u306f\u51fa\u53e3\uff08\u65e2\u5b58\u306e\u5358\u8a9e\u3001\u30b7\u30f3\u30dc\u30eb\uff09\u306b\u4fdd\u5b58\u3055\u308c\u3001\u8f9e\u66f8\u306b\u65b0\u3057\u3044\u5358\u8a9e\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059 BBC  BBCA \uff086\u3001 a \uff09\uff09 7 BBCA  \u8f9e\u66f8\u306b\u6587\u5b57\u5217\u304c\u3042\u308a\u307e\u3059 BBC \uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b96\uff09\u3057\u304b\u3057\u3001 BBCA ;\u30da\u30a2\u306f\u51fa\u53e3\uff08\u65e2\u5b58\u306e\u5358\u8a9e\u3001\u30b7\u30f3\u30dc\u30eb\uff09\u306b\u4fdd\u5b58\u3055\u308c\u3001\u8f9e\u66f8\u306b\u65b0\u3057\u3044\u5358\u8a9e\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059 BBCA  AAC \uff085\u3001 c \uff09\uff09 8 AAC  \u8f9e\u66f8\u306b\u6587\u5b57\u5217\u304c\u3042\u308a\u307e\u3059 aa \uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b95\uff09\u3057\u304b\u3057\u3001 AAC ;\u30da\u30a2\u306f\u51fa\u53e3\uff08\u65e2\u5b58\u306e\u5358\u8a9e\u3001\u30b7\u30f3\u30dc\u30eb\uff09\u306b\u4fdd\u5b58\u3055\u308c\u3001\u8f9e\u66f8\u306b\u65b0\u3057\u3044\u5358\u8a9e\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059 AAC  \u8f9e\u66f8\u306b\u9577\u3044\u5358\u8a9e\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002 \u524d\u306e\u4f8b\u304b\u3089\u306e\u30c7\u30fc\u30bf\u306f\u5ec3\u68c4\u3055\u308c\u307e\u3059\u3002 \u30a8\u30f3\u30c8\u30ea \u51fa\u53e3 \u8f9e\u66f8 \u30b3\u30e1\u30f3\u30c8 \u7d22\u5f15 \u8a00\u8449 \uff080\u3001 a \uff09\uff09 a \u521d\u3081 a  \u30b7\u30f3\u30dc\u30eb a \u51fa\u53e3\u306b\u5c0e\u304b\u308c\u3001\u5358\u4e00\u306e\u8981\u7d20\u6587\u5b57\u5217\u304c\u8f9e\u66f8\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3059 a  \uff080\u3001 b \uff09\uff09 b 2 b  \u30b7\u30f3\u30dc\u30eb b \u51fa\u53e3\u306b\u5c0e\u304b\u308c\u3001\u5358\u4e00\u306e\u8981\u7d20\u6587\u5b57\u5217\u304c\u8f9e\u66f8\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3059 b  \uff082\u3001 b \uff09\uff09 BB 3 BB  \u7d42\u4e86\u306b\u5358\u8a9e\u304c\u66f8\u304b\u308c\u3066\u3044\u307e\u3059 b \u8f9e\u66f8\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b92\uff09\u304b\u3089\u3001\u30b7\u30f3\u30dc\u30eb\u3082\u66f8\u304d\u51fa\u3055\u308c\u307e\u3059 b ;\u8f9e\u66f8\u306b\u65b0\u3057\u3044\u7d99\u7d9a\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u30012\u3064\u306e\u5358\u8a9e\u3068\u30b7\u30f3\u30dc\u30eb\u3092\u63a5\u7740\u3057\u3066\u3044\u307e\u3059\u3002 BB  \uff080\u3001 c \uff09\uff09 c 4 c  \u30b7\u30f3\u30dc\u30eb c \u51fa\u53e3\u306b\u5c0e\u304b\u308c\u3001\u5358\u4e00\u306e\u8981\u7d20\u6587\u5b57\u5217\u304c\u8f9e\u66f8\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3059 c  \uff08\u521d\u3081\u3001 a \uff09\uff09 aa 5 aa  \u7d42\u4e86\u306b\u5358\u8a9e\u304c\u66f8\u304b\u308c\u3066\u3044\u307e\u3059 a \u8f9e\u66f8\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b91\uff09\u304b\u3089\u3001\u30b7\u30f3\u30dc\u30eb\u3082\u66f8\u304d\u51fa\u3055\u308c\u307e\u3059 a ;\u65b0\u3057\u3044\u7d99\u7d9a\u304c\u8f9e\u66f8\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002\u8f9e\u66f8\u306f\u30011\u3068\u3044\u3046\u8a00\u8449\u3092\u63a5\u7740\u3057\u3066\u3044\u307e\u3059\u3002 aa  \uff083\u3001 c \uff09\uff09 BBC 6 BBC  \u7d42\u4e86\u306b\u5358\u8a9e\u304c\u66f8\u304b\u308c\u3066\u3044\u307e\u3059 BB \u8f9e\u66f8\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b93\uff09\u304b\u3089\u3001\u30b7\u30f3\u30dc\u30eb\u3082\u66f8\u304d\u51fa\u3055\u308c\u307e\u3059 c ;\u8f9e\u66f8\u306b\u65b0\u3057\u3044\u7d99\u7d9a\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u30012\u3064\u306e\u5358\u8a9e\u3068\u30b7\u30f3\u30dc\u30eb\u3092\u63a5\u7740\u3057\u3066\u3044\u307e\u3059\u3002 BBC  \uff086\u3001 a \uff09\uff09 BBCA 7 BBCA  \u7d42\u4e86\u306b\u5358\u8a9e\u304c\u66f8\u304b\u308c\u3066\u3044\u307e\u3059 BBC \u8f9e\u66f8\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b96\uff09\u304b\u3089\u3001\u30b7\u30f3\u30dc\u30eb\u3082\u66f8\u304d\u51fa\u3055\u308c\u307e\u3059 a ;\u5358\u8a9e6\u3068\u30b7\u30f3\u30dc\u30eb\u306e\u65b0\u3057\u3044\u7d99\u7d9a\u304c\u8f9e\u66f8\u306b\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002 BBCA  \uff085\u3001 c \uff09\uff09 AAC 8 AAC  \u7d42\u4e86\u306b\u5358\u8a9e\u304c\u66f8\u304b\u308c\u3066\u3044\u307e\u3059 aa \u8f9e\u66f8\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b95\uff09\u304b\u3089\u3001\u30b7\u30f3\u30dc\u30eb\u3082\u66f8\u304d\u51fa\u3055\u308c\u307e\u3059 c ;\u8f9e\u66f8\u306b\u65b0\u3057\u3044\u7d99\u7d9a\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u30015\u3064\u306e\u5358\u8a9e\u3068\u30b7\u30f3\u30dc\u30eb\u306e\u63a5\u7740\u3067\u3059\u3002 AAC  LZ78\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066Python\u30b3\u30fc\u30c9\u3067\u66f8\u304b\u308c\u305f\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\uff08 LZ78_ENCODE \uff09\u305d\u3057\u3066\u3001\u8131\u5316\u3059\u308b\uff08 LZ78_DECODE \uff09\u305d\u3057\u3066\u6700\u5f8c\u306b\u3001\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3068\u30c7\u30b3\u30fc\u30c9\u306e\u30d7\u30ed\u30bb\u30b9\u304c\u6b63\u3057\u304f\u9032\u3093\u3060\u304b\u3069\u3046\u304b\u3092\u8ff0\u3079\u3001\u8981\u7d04\u3092\u8868\u793a\u3057\u307e\u3059\u3002 Python\u306e\u8a18\u4e8b\u306e\u30bd\u30fc\u30b9\u304c\u5727\u7e2e\u3055\u308c\u305f\u3068\u304d\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u7d50\u679c\u306e\u4f8b\uff1a $ python lz78.py python-artykul.txt\u30da\u30a2\u6570\uff1a6295\u30b3\u30fc\u30c9\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u6700\u5927\u6570\uff1a13\u6700\u5927\u30da\u30a2\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u30d3\u30c3\u30c8\u6570\uff1a13 + 8 = 21\u5165\u529b\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\uff1a23805\u30d0\u30a4\u30c8\u5727\u7e2e\u30c7\u30fc\u30bf\u306e\u30b5\u30a4\u30ba\uff1a165\u200b\u200b25\u30d0\u30a4\u30c8\u5727\u7e2e\u5ea6\uff1a30.58\uff05 \u6ce8\u610f\uff1a \u5727\u7e2e\u306e\u7a0b\u5ea6\u306f\u3001\u30b3\u30fc\u30c9\u3092\u8a18\u9332\u3059\u308b\u65b9\u6cd5\u306b\u3082\u4f9d\u5b58\u3057\u307e\u3059 &#8211; \u5727\u7e2e\u30c7\u30fc\u30bf\u3068\u5727\u7e2e\u306e\u30b5\u30a4\u30ba\u3092\u8a08\u7b97\u3059\u308b\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001\u5404\u30b3\u30fc\u30c9\u306b\u4e00\u5b9a\u306e\u30d3\u30c3\u30c8\u6570\u304c\u3042\u308b\u3068\u60f3\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u5b9f\u969b\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u3001\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u304c\u7570\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002 \uff03 - * - \u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff1aISO-8859-2-* -   def  LZ78_ENCODE \uff08 \u30c7\u30fc\u30bf \uff09\uff1a  d  =  {}  n  =  \u521d\u3081  c  =  ''  \u7d50\u679c  =  []  \u305f\u3081\u306b  s  \u306e  \u30c7\u30fc\u30bf \uff1a  \u3082\u3057\u3082  c  +  s  \u3044\u3044\u3048  \u306e  d \uff1a  \u3082\u3057\u3082  c  ==  '' \uff1a  \uff03\u7279\u5225\u30b1\u30fc\u30b9\uff1a\u30b7\u30f3\u30dc\u30eb\u300cS\u300d  \uff03\u306f\u8f9e\u66f8\u306b\u307e\u3060\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u305b\u3093  \u7d50\u679c \u3002 \u8ffd\u52a0 \uff08  \uff08 0 \u3001  s \uff09\uff09  \uff09\uff09  d [ s ]  =  n  \u305d\u308c\u4ee5\u5916 \uff1a  \uff03Stret 'C'\u306f\u8f9e\u66f8\u306b\u3042\u308a\u307e\u3059  \u7d50\u679c \u3002 \u8ffd\u52a0 \uff08  \uff08 d [ c ]\u3001\u3001  s \uff09\uff09  \uff09\uff09  d [ c  +  s ]  =  n  n  =  n  +  \u521d\u3081  c  =  ''  \u305d\u308c\u4ee5\u5916 \uff1a  c  =  c  +  s  \u623b\u308b  \u7d50\u679c  def  LZ78_DECODE \uff08 \u30c7\u30fc\u30bf \uff09\uff1a  d  =  {}  n  =  \u521d\u3081  \u7d50\u679c  =  []  \u305f\u3081\u306b  \u79c1 \u3001  s  \u306e  \u30c7\u30fc\u30bf \uff1a  \u3082\u3057\u3082  \u79c1  ==  0 \uff1a  \u7d50\u679c \u3002 \u8ffd\u52a0 \uff08 s \uff09\uff09  d [ n ]  =  s  n  =  n  +  \u521d\u3081  \u305d\u308c\u4ee5\u5916 \uff1a  \u7d50\u679c \u3002 \u8ffd\u52a0 \uff08 d [ \u79c1 ]  +  s \uff09\uff09  d [ n ]  =  d [ \u79c1 ]  +  s  n  =  n  +  \u521d\u3081  \u623b\u308b  '' \u3002 \u52a0\u5165 \uff08 \u7d50\u679c \uff09\uff09  \u3082\u3057\u3082  __\u540d\u524d__  ==  '__\u4e3b\u8981__' \uff1a  \u8f38\u5165  sys  \u304b\u3089  \u7b97\u6570  \u8f38\u5165  \u30ed\u30b0 \u3001  \u5929\u4e95  \u3082\u3057\u3082  \u305d\u308c\u3060\u3051 \uff08 sys \u3002 argv \uff09\uff09  <  2 \uff1a  \u5370\u5237  \u300c\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u5165\u529b\u300d  sys \u3002 \u51fa\u53e3 \uff08 \u521d\u3081 \uff09\uff09  \u30c7\u30fc\u30bf  =  \u958b\u3051\u308b \uff08 sys \u3002 argv [ \u521d\u3081 ]\uff09\uff09 \u3002 \u8aad\u3080 \uff08\uff09  comp  =  LZ78_ENCODE \uff08 \u30c7\u30fc\u30bf \uff09\uff09  \u5206\u89e3  =  LZ78_DECODE \uff08 comp \uff09\uff09  \u3082\u3057\u3082  \u30c7\u30fc\u30bf  ==  \u5206\u89e3 \uff1a  k  =  \u305d\u308c\u3060\u3051 \uff08 comp \uff09\uff09  n  =  int \uff08 \u5929\u4e95 \uff08 \u30ed\u30b0 \uff08 \u30de\u30c3\u30af\u30b9 \uff08 \u7d22\u5f15  \u305f\u3081\u306b  \u7d22\u5f15 \u3001  \u30b7\u30f3\u30dc\u30eb  \u306e  comp \uff09\u3001\u3001  2.0 \uff09\uff09\uff09\uff09  L1  =  \u305d\u308c\u3060\u3051 \uff08 \u30c7\u30fc\u30bf \uff09\uff09  L2  =  \uff08 k * \uff08 n + 8 \uff09\uff09  +  7 \uff09\uff09 \/ 8  \u5370\u5237  \u300c\u30ab\u30c3\u30d7\u30eb\u306e\u6570\uff1a \uff05d \u300c  \uff05  k  \u5370\u5237  \u300c\u30de\u30c3\u30af\u30b9\u3002\u30b3\u30fc\u30c9\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u30d3\u30c3\u30c8\u6570\uff1a \uff05d \u300c  \uff05  n  \u5370\u5237  \u300c\u30de\u30c3\u30af\u30b9\u3002\u30da\u30a2\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u30d3\u30c3\u30c8\u6570\uff1a \uff05d + \uff05d = \uff05d \u300c  \uff05  \uff08 n \u3001  8 \u3001  n + 8 \uff09\uff09  \u5370\u5237  \u300c\u5165\u529b\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\uff1a \uff05d \u30d0\u30a4\u30c8\u300d  \uff05  L1  \u5370\u5237  \u300c\u5727\u7e2e\u30c7\u30fc\u30bf\u306e\u30b5\u30a4\u30ba\uff1a \uff05d \u30d0\u30a4\u30c8\u300d  \uff05  L2  \u5370\u5237  \u300c\u5727\u7e2e\u5ea6\uff1a \uff052F %% \u300c  \uff05  \uff08 100.0 * \uff08 L1  -  L2 \uff09\uff09 \/ L1 \uff09\uff09  \uff03\u30c7\u30fc\u30bf\u3092\u5370\u5237\u3057\u307e\u3059  \uff03decomp\u3092\u5370\u5237\u3057\u307e\u3059  \u305d\u308c\u4ee5\u5916 \uff1a  \u5370\u5237  \u300c\u9593\u9055\u3044\u304c\u3042\u308a\u307e\u3057\u305f\uff01\u300d  Adam Drozdek\uff1a \u30c7\u30fc\u30bf\u5727\u7e2e\u306e\u7d39\u4ecb \u3002\u30ef\u30eb\u30b7\u30e3\u30ef\uff1awydawnictwo naukowo-techniczne\u30011999\u3002ISBN 83-204-2303-1 \u3002       (adsbygoogle = window.adsbygoogle || 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