{"id":33,"date":"2013-10-05T03:45:36","date_gmt":"2013-10-04T18:45:36","guid":{"rendered":"https:\/\/www.dogrow.net\/nnet\/?p=33"},"modified":"2025-06-11T22:48:41","modified_gmt":"2025-06-11T13:48:41","slug":"blog3","status":"publish","type":"post","link":"https:\/\/www.dogrow.net\/nnet\/blog3\/","title":{"rendered":"(3) MNIST\u753b\u50cf\u3092PNG\u753b\u50cf\u3067\u51fa\u529b\u3059\u308b\uff08Octave\u7248\uff09"},"content":{"rendered":"

\u4e0b\u8a18\u6295\u7a3f\u3067\u306f\u3001MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u305f\u3002
\n(1) MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/a><\/p>\n

\u4e0b\u8a18\u6295\u7a3f\u3067\u306f\u3001MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u306e\u3044\u304f\u3064\u304b\u3092 Octave\u3067\u753b\u50cf\u5316\u3057\u3066\u773a\u3081\u3066\u307f\u305f\u3002
\n(2) MNIST\u5b66\u7fd2\u753b\u50cf\u3092\u898b\u3066\u307f\u308b<\/a><\/p>\n

\u4eca\u56de\u306f\u3001MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u306b\u542b\u307e\u308c\u308b\u5168\u753b\u50cf\u3092\u3000PNG\u753b\u50cf<\/span>\u3000\u306b\u3057\u3066\u773a\u3081\u3066\u307f\u305f\u3044\u3002
\n\u4eca\u56de\u3082 GNU-Octave<\/span>\u3092\u4f7f\u7528\u3059\u308b\u3002Octave\u306f\u5c11\u306a\u3044\u30b3\u30fc\u30c9\u91cf\u3067\u9ad8\u6a5f\u80fd\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3051\u308b\u306e\u3067\u91cd\u5b9d\u3057\u3066\u3044\u308b\u3002<\/p>\n

\u4f5c\u6210\u3059\u308b\u95a2\u6570\u306f cre_MNIST_PNG \u3068\u3059\u308b\u3002
\n\u7b2c1\u5f15\u6570\u306f\u3001MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u306e\u30d1\u30b9\u3002\u5b66\u7fd2\u7528 or \u30c6\u30b9\u30c8\u7528\u306e\u3069\u3061\u3089\u304b\u4e00\u65b9\u3092\u6307\u5b9a\u3059\u308b\u3002
\n\u7b2c2\u5f15\u6570\u306f\u3001PNG\u5316\u3057\u305fMNIST\u753b\u50cf\u306e\u51fa\u529b\u5148\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u30d1\u30b9\u3002
\n\u3010\u6ce8\u610f\u3011
\n\u7b2c1\u5f15\u6570\u3067\u6e21\u3059\u30d5\u30a1\u30a4\u30eb\u306f\u3001(1) MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/a> \u306b\u8a18\u3057\u305f\u3088\u3046\u306b\u4e8b\u524d\u306b\u89e3\u51cd\u3057\u3066\u304a\u304f\u3053\u3068\u3002<\/span><\/p>\n

\r\nfunction cre_MNIST_PNG( image_file, output_dir )\r\n  % \u753b\u50cf\u3092\u30ed\u30fc\u30c9<\/span>\r\n  fid = fopen(image_file,'r','b');\r\n  magic_number      = fread(fid, 1, 'int32');\r\n  number_of_items   = fread(fid, 1, 'int32');\r\n  number_of_rows    = fread(fid, 1, 'int32');\r\n  number_of_columns = fread(fid, 1, 'int32');\r\n  img               = fread(fid, [number_of_rows*number_of_columns number_of_items],'uint8');\r\n  image = permute(reshape(img, number_of_rows, number_of_columns,number_of_items),[2 1 3]);\r\n  fclose(fid);\r\n\r\n  % \u753b\u50cf\u3092PNG\u30d5\u30a1\u30a4\u30eb\u51fa\u529b<\/span>\r\n  if exist(output_dir)==0\r\n    mkdir(output_dir);\r\n  end\r\n  for i=1 : number_of_items\r\n    pngfile = sprintf('%s\/img%05d.png', output_dir, i);\r\n    imwrite(uint8(image(:,:,i)), pngfile);\r\n  end\r\nend\r\n<\/pre>\n
\u307e\u305a\u306f\u30c6\u30b9\u30c8\u7528\u753b\u50cf t10k-images-idx3-ubyte<\/span> \u3092PNG\u753b\u50cf\u5316\u3057\u3066\u307f\u308b\u3002<\/p>\n
\r\noctave:1> cre_MNIST_PNG('t10k-images-idx3-ubyte'<\/span>,'.\/img'<\/span>);\r\noctave:2>\r\n<\/pre>\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306aPNG\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u304c\u51fa\u529b\u3055\u308c\u305f\u3002(\u516810,000\u500b\u306e\u5185\u306e\u5148\u982d\u304b\u3089105\u500b\u3092\u8868\u793a)
\n\"https:\/\/www.dogrow.net\/nnet\/wp-content\/uploads\/2013\/10\/20131005_04.png\"<\/p>\n
\u6b21\u56de\u300c(4) \u30b7\u30f3\u30d7\u30eb\u69cb\u6210\u306e\u521d\u7248\u306f\u6b63\u89e3\u738791%\u300d\u3067\u306f\u3001\u5b9f\u969b\u306b\u6a5f\u68b0\u5b66\u7fd2\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u3066 MNIST\u753b\u50cf\u306e\u81ea\u52d5\u8a8d\u8b58\u3092\u3084\u3063\u3066\u307f\u308b\u3002<\/a><\/p>\n
\n","protected":false},"excerpt":{"rendered":"
\u4e0b\u8a18\u6295\u7a3f\u3067\u306f\u3001MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u305f\u3002 (1) MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9 \u4e0b\u8a18\u6295\u7a3f\u3067\u306f\u3001MNIST\u753b\u50cf\u30c7\u30fc\u30bf\u306e\u3044\u304f\u3064\u304b\u3092 Octave\u3067\u753b\u50cf\u5316\u3057\u3066\u773a\u3081\u3066\u307f\u305f\u3002 (2) MNIST\u5b66\u7fd2\u753b\u50cf\u2026 \u7d9a\u304d\u3092\u8aad\u3080 »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,2,4],"tags":[],"class_list":["post-33","post","type-post","status-publish","format-standard","hentry","category-mnist","category-2","category-4"],"views":8518,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/posts\/33","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/comments?post=33"}],"version-history":[{"count":32,"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/posts\/33\/revisions"}],"predecessor-version":[{"id":2535,"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/posts\/33\/revisions\/2535"}],"wp:attachment":[{"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/media?parent=33"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/categories?post=33"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dogrow.net\/nnet\/wp-json\/wp\/v2\/tags?post=33"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}