{"id":3066,"date":"2012-01-18T23:25:58","date_gmt":"2012-01-18T14:25:58","guid":{"rendered":"http:\/\/umezawa.dyndns.info\/wordpress\/?p=3066"},"modified":"2012-01-19T01:04:48","modified_gmt":"2012-01-18T16:04:48","slug":"utvideo-jpeg-ls-%e3%81%ae-prediction","status":"publish","type":"post","link":"http:\/\/umezawa.dyndns.info\/wordpress\/?p=3066","title":{"rendered":"[UtVideo] JPEG-LS \u306e prediction"},"content":{"rendered":"

\u8ab0\u304b\u304c\u300cJPEG-LS \u3092\u57fa\u306b\u3057\u305f\u53ef\u9006\u5727\u7e2e\u30b3\u30fc\u30c7\u30c3\u30af\u3092\u4f5c\u308d\u3046\u304b\u306a\u30fc\u300d\u3068\u8a00\u3063\u3066\u3044\u308b\u3089\u3057\u3044\u3001\u3068\u3044\u3046\u8a71\u3092\u5c0f\u8033\u306b\u631f\u307f\u307e\u3057\u305f\u3002\u3061\u3087\u308d\u3063\u3068\u8abf\u3079\u305f\u7d50\u679c\u3001\u30d5\u30ec\u30fc\u30e0\u5185\u4e88\u6e2c\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u7c21\u5358\u306b\u53d6\u308a\u8fbc\u3081\u305d\u3046\u3060\u3063\u305f\u306e\u3067\u3001\u8a66\u3057\u306b\u53d6\u308a\u8fbc\u3093\u3067\u307f\u308b\u3068 predict median \u3068\u6bd4\u8f03\u3057\u3066\u6700\u5927\u3067 1% \u7a0b\u5ea6\u306e\u5727\u7e2e\u7387\u306e\u6539\u5584\u304c\u898b\u3089\u308c\u307e\u3057\u305f\u3002<\/p>\n

<\/p>\n

\u3055\u3066\u3001JPEG-LS \u306e\u30d5\u30ec\u30fc\u30e0\u5185\u4e88\u6e2c\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f0f\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

\n
a = (left)\r\nb = (top)\r\nc = (topleft)\r\npredicted = min(a, b)  if c > max(a, b)\r\n            max(a, b)  if c < min(a, b)\r\n            a + b - c  if otherwise<\/pre>\n<\/blockquote>\n
\u3057\u304b\u3057\u3053\u308c\u3092\u3088\u30fc\u304f\u898b\u308b\u3068 predict median \u3068\uff08\u8868\u73fe\u304c\u9055\u3046\u3060\u3051\u3067\uff09\u5168\u304f\u540c\u3058\u306a\u3093\u3067\u3059\u306d\u3002predict median \u306f\u4ee5\u4e0b\u306e\u5f0f\u3067\u3059\u3002<\/p>\n
\n
a = (left)\r\nb = (top)\r\nc = (topleft)\r\npredicted = median(a, b, a + b - c)<\/pre>\n<\/blockquote>\n
\u3053\u3053\u3067\u3001median() \u306f\u4e2d\u592e\u5024\uff08\u5f15\u6570\u304c 3 \u3064\u306a\u306e\u3067 2 \u756a\u76ee\u306b\u5927\u304d\u3044\u5024\uff09\u3092\u8fd4\u3059\u95a2\u6570\u3067\u3059\u3002<\/p>\n
\u3058\u3083\u3042\u306a\u3093\u3067 predict median \u3068\u6bd4\u8f03\u3057\u3066\u5727\u7e2e\u7387\u304c\u5909\u5316\u3059\u308b\u306e\u304b\u3068\u3044\u3046\u3068\u3001Ut Video Codec Suite \u306b\u304a\u3051\u308b predict median \u306e\u5b9f\u88c5\u3067\u306f\u3001\u4e0a\u306e\u8a08\u7b97\u306f uint8_t \u3067\u884c\u3063\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002a + b – c \u306f uint8_t \u306e\u7bc4\u56f2\u304b\u3089\u306f\u307f\u51fa\u3059\u3053\u3068\u304c\u3042\u308b\u306e\u3067\u3001\u305d\u306e\u5834\u5408\u4e88\u6e2c\u7d50\u679c\u304c\u304a\u304b\u3057\u304f\u306a\u308a\u307e\u3059\uff08\u4e00\u822c\u7684\u306b\u306f\u4e0d\u9069\u5207\u306a\u4e88\u6e2c\u7d50\u679c\u306b\u306a\u308b\uff09\u3002\u3061\u3087\u3063\u3068\u4ed6\u306e\u5b9f\u88c5\u3092\u898b\u305f\u3068\u3053\u308d\u3001Huffyuv \u3067\u306f\u540c\u3058\u554f\u984c\u304c\u767a\u751f\u3057\u3001Lagarith \u3067\u306f int \u306b\u62e1\u5f35\u3057\u3066\u304b\u3089\u8a08\u7b97\u3057\u3066\u3044\u308b\u306e\u3067\u554f\u984c\u306a\u3057\u3001\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n
int16_t \u3042\u305f\u308a\u3067\u8a08\u7b97\u3059\u308c\u3070\u3053\u306e\u554f\u984c\u306f\u767a\u751f\u3057\u306a\u3044\u306e\u3067\u3059\u304c\u3001\u6700\u7d42\u7684\u306b\u306f\u30a2\u30bb\u30f3\u30d6\u30e9\u30b3\u30fc\u30c9\u3092\u65b0\u898f\u306b\u66f8\u304b\u306a\u3051\u308c\u3070\u306a\u3089\u305a\u3081\u3093\u3069\u304f\u3055\u3044\uff06\u51e6\u7406\u91cf\u306f\u78ba\u5b9f\u306b\u5897\u3048\u308b\u306e\u306b\u5bfe\u3057\u3001\u5727\u7e2e\u7387\u306e\u6539\u5584\u306f\u4e0a\u306b\u66f8\u3044\u305f\u3068\u304a\u308a 1% \u7a0b\u5ea6\u3067\u3042\u308b\u306e\u3067\u3001\u3042\u307e\u308a\u4e57\u308a\u6c17\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5c11\u306a\u304f\u3068\u3082\u77ed\u671f\u7684\u306b\u306f\u4ed6\u306e\u3053\u3068\u3092\u3057\u305f\u3044\u3067\u3059\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8ab0\u304b\u304c\u300cJPEG-LS \u3092\u57fa\u306b\u3057\u305f\u53ef\u9006\u5727\u7e2e\u30b3\u30fc\u30c7\u30c3\u30af\u3092\u4f5c\u308d\u3046\u304b\u306a\u30fc\u300d\u3068\u8a00\u3063\u3066\u3044\u308b\u3089\u3057\u3044\u3001\u3068\u3044\u3046\u8a71\u3092\u5c0f\u8033\u306b\u631f\u307f\u307e\u3057\u305f\u3002\u3061\u3087\u308d\u3063\u3068\u8abf\u3079\u305f\u7d50\u679c\u3001\u30d5\u30ec\u30fc\u30e0\u5185\u4e88\u6e2c\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u7c21\u5358\u306b\u53d6\u308a\u8fbc\u3081\u305d\u3046\u3060\u3063\u305f\u306e\u3067\u3001\u8a66\u3057\u306b\u53d6\u308a\u8fbc\u3093\u3067\u307f\u308b\u3068  […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,6],"tags":[],"class_list":["post-3066","post","type-post","status-publish","format-standard","hentry","category-ut-video-codec-suite","category-programming"],"_links":{"self":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3066","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3066"}],"version-history":[{"count":7,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3066\/revisions"}],"predecessor-version":[{"id":3073,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3066\/revisions\/3073"}],"wp:attachment":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3066"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}