続・EXIF からレンズ名を取得する（Nikon編）

exif

nikon

programming

先日作った EXIF からレンズ ID を取り出すプログラムですが、どうしてもレンズ ID の8バイト目を一致させることができませんでした。初めは単なる僕の作り込んだバグだと踏んでいたのですが、改めてこの件を調べてみると JpegAnalyzer Plus に同梱されている LensData.ini にレンズ ID の8バイト目は 0x0098 というタグからではなく、0x0083 というタグから取得する必要があるという記載を見つけました。

LensData.ini

; IDは16進８バイトを入力し易いように４桁区切りでハイフンを入れて表記
; ８バイトの値は以下の通り
; バイト０－レンズID　    タグ0x0098-レンズ情報0100-6 /レンズ情報0101-11
; バイト１－F-Stop      　タグ0x0098-レンズ情報0100-7 /レンズ情報0101-12
;   APEX値=Value/12　(開放～最小絞り間の段数値らしい)
; バイト２－焦点距離W     タグ0x0098-レンズ情報0100-8 /レンズ情報0101-13
; バイト３－焦点距離T     タグ0x0098-レンズ情報0100-9 /レンズ情報0101-14
;   距離[mm]=５ x √２＾(Value/12)
; バイト４－開放F値W　　　タグ0x0098-レンズ情報0100-10/レンズ情報0101-15
; バイト５－開放F値T　　　タグ0x0098-レンズ情報0100-11/レンズ情報0101-16
;   F値=√２＾(Value/12)
; バイト６－MCU Version 　タグ0x0098-レンズ情報0100-12/レンズ情報0101-17
; バイト７－レンズタイプ　タグ0x0083

どうやら僕の仕様の勘違いだったようです。
というわけでこれを反映したコードにアップデートしてみました。

† アップデート版サンプルコード

このコードを使うと F-Mount lenses listed by Extended LensID に記載されている8バイトのレンズ ID 表をそのまま使うことができます。

exiftest_nikon_v2.php

<?php

$Toolkit_Dir = "./";
include $Toolkit_Dir . 'EXIF.php';

// Lens List
$NikonLensDB = array (
'AE 54 62 62 0C 0C B0 06' => array('Nikon','AF-S Nikkor 85mm f/1.4G'),
'AF 54 44 44 0C 0C B1 06' => array('Nikon','AF-S Nikkor 35mm f/1.4G'),
'B0 4C 50 50 14 14 B2 06' => array('Nikon','AF-S Nikkor 50mm f/1.8G'),
'B1 48 48 48 24 24 B3 06' => array('Nikon','AF-S DX Micro Nikkor 40mm f/2.8G'),
'B2 48 5C 80 30 30 B4 0E' => array('Nikon','AF-S Nikkor 70-200mm f/4G ED VR'),
'B3 4C 62 62 14 14 B5 06' => array('Nikon','AF-S Nikkor 85mm f/1.8G'),
'B4 40 37 62 2C 34 B6 0E' => array('Nikon','AF-S Nikkor 24-85 mm f/3.5-4.5G ED VR'),
'B5 4C 3C 3C 14 14 B7 06' => array('Nikon','AF-S Nikkor 28mm f/1.8G'),
'B7 44 60 98 34 3C B9 0E' => array('Nikon','AF-S Nikkor 80-400mm f/4.5-5.6G ED VR'),
'dummy' => array());

// Decrypt Routine
function _decryptNikonDataBlock($dataPt, $serial, $count){
  $xlat0 = array(
    0xc1,0xbf,0x6d,0x0d,0x59,0xc5,0x13,0x9d,0x83,0x61,0x6b,0x4f,0xc7,0x7f,0x3d,0x3d,
    0x53,0x59,0xe3,0xc7,0xe9,0x2f,0x95,0xa7,0x95,0x1f,0xdf,0x7f,0x2b,0x29,0xc7,0x0d,
    0xdf,0x07,0xef,0x71,0x89,0x3d,0x13,0x3d,0x3b,0x13,0xfb,0x0d,0x89,0xc1,0x65,0x1f,
    0xb3,0x0d,0x6b,0x29,0xe3,0xfb,0xef,0xa3,0x6b,0x47,0x7f,0x95,0x35,0xa7,0x47,0x4f,
    0xc7,0xf1,0x59,0x95,0x35,0x11,0x29,0x61,0xf1,0x3d,0xb3,0x2b,0x0d,0x43,0x89,0xc1,
    0x9d,0x9d,0x89,0x65,0xf1,0xe9,0xdf,0xbf,0x3d,0x7f,0x53,0x97,0xe5,0xe9,0x95,0x17,
    0x1d,0x3d,0x8b,0xfb,0xc7,0xe3,0x67,0xa7,0x07,0xf1,0x71,0xa7,0x53,0xb5,0x29,0x89,
    0xe5,0x2b,0xa7,0x17,0x29,0xe9,0x4f,0xc5,0x65,0x6d,0x6b,0xef,0x0d,0x89,0x49,0x2f,
    0xb3,0x43,0x53,0x65,0x1d,0x49,0xa3,0x13,0x89,0x59,0xef,0x6b,0xef,0x65,0x1d,0x0b,
    0x59,0x13,0xe3,0x4f,0x9d,0xb3,0x29,0x43,0x2b,0x07,0x1d,0x95,0x59,0x59,0x47,0xfb,
    0xe5,0xe9,0x61,0x47,0x2f,0x35,0x7f,0x17,0x7f,0xef,0x7f,0x95,0x95,0x71,0xd3,0xa3,
    0x0b,0x71,0xa3,0xad,0x0b,0x3b,0xb5,0xfb,0xa3,0xbf,0x4f,0x83,0x1d,0xad,0xe9,0x2f,
    0x71,0x65,0xa3,0xe5,0x07,0x35,0x3d,0x0d,0xb5,0xe9,0xe5,0x47,0x3b,0x9d,0xef,0x35,
    0xa3,0xbf,0xb3,0xdf,0x53,0xd3,0x97,0x53,0x49,0x71,0x07,0x35,0x61,0x71,0x2f,0x43,
    0x2f,0x11,0xdf,0x17,0x97,0xfb,0x95,0x3b,0x7f,0x6b,0xd3,0x25,0xbf,0xad,0xc7,0xc5,
    0xc5,0xb5,0x8b,0xef,0x2f,0xd3,0x07,0x6b,0x25,0x49,0x95,0x25,0x49,0x6d,0x71,0xc7);
  $xlat1 = array(
    0xa7,0xbc,0xc9,0xad,0x91,0xdf,0x85,0xe5,0xd4,0x78,0xd5,0x17,0x46,0x7c,0x29,0x4c,
    0x4d,0x03,0xe9,0x25,0x68,0x11,0x86,0xb3,0xbd,0xf7,0x6f,0x61,0x22,0xa2,0x26,0x34,
    0x2a,0xbe,0x1e,0x46,0x14,0x68,0x9d,0x44,0x18,0xc2,0x40,0xf4,0x7e,0x5f,0x1b,0xad,
    0x0b,0x94,0xb6,0x67,0xb4,0x0b,0xe1,0xea,0x95,0x9c,0x66,0xdc,0xe7,0x5d,0x6c,0x05,
    0xda,0xd5,0xdf,0x7a,0xef,0xf6,0xdb,0x1f,0x82,0x4c,0xc0,0x68,0x47,0xa1,0xbd,0xee,
    0x39,0x50,0x56,0x4a,0xdd,0xdf,0xa5,0xf8,0xc6,0xda,0xca,0x90,0xca,0x01,0x42,0x9d,
    0x8b,0x0c,0x73,0x43,0x75,0x05,0x94,0xde,0x24,0xb3,0x80,0x34,0xe5,0x2c,0xdc,0x9b,
    0x3f,0xca,0x33,0x45,0xd0,0xdb,0x5f,0xf5,0x52,0xc3,0x21,0xda,0xe2,0x22,0x72,0x6b,
    0x3e,0xd0,0x5b,0xa8,0x87,0x8c,0x06,0x5d,0x0f,0xdd,0x09,0x19,0x93,0xd0,0xb9,0xfc,
    0x8b,0x0f,0x84,0x60,0x33,0x1c,0x9b,0x45,0xf1,0xf0,0xa3,0x94,0x3a,0x12,0x77,0x33,
    0x4d,0x44,0x78,0x28,0x3c,0x9e,0xfd,0x65,0x57,0x16,0x94,0x6b,0xfb,0x59,0xd0,0xc8,
    0x22,0x36,0xdb,0xd2,0x63,0x98,0x43,0xa1,0x04,0x87,0x86,0xf7,0xa6,0x26,0xbb,0xd6,
    0x59,0x4d,0xbf,0x6a,0x2e,0xaa,0x2b,0xef,0xe6,0x78,0xb6,0x4e,0xe0,0x2f,0xdc,0x7c,
    0xbe,0x57,0x19,0x32,0x7e,0x2a,0xd0,0xb8,0xba,0x29,0x00,0x3c,0x52,0x7d,0xa8,0x49,
    0x3b,0x2d,0xeb,0x25,0x49,0xfa,0xa3,0xaa,0x39,0xa7,0xc5,0xa7,0x50,0x11,0x36,0xfb,
    0xc6,0x67,0x4a,0xf5,0xa5,0x12,0x65,0x7e,0xb0,0xdf,0xaf,0x4e,0xb3,0x61,0x7f,0x2f);

  $serial = (int) $serial;
  $count = (int) $count;
  $len = strlen($dataPt);

  if($len <= 0) return '';
  $key = 0;
  for ($i=0; $i<4; ++$i) {
    $key ^= ($count >> ($i*8)) & 0xff;
  }
  $ci = $xlat0[$serial & 0xff];
  $cj = $xlat1[$key];
  $ck = 0x60;
  $data = unpack("C*", $dataPt);
  foreach ($data as $i => $dat) {
    $cj = ($cj + $ci * $ck) & 0xff;
    $ck = ($ck + 1) & 0xff;
    $data[$i] ^= $cj;
  }
  return $data;
}

$filename = "20130428-D600_004209.JPG";
$exif = get_EXIF_JPEG( $filename );

$makerNote = $exif[0][34665]['Data'][0][37500]["Decoded Data"][0];
$shutterCount = $makerNote[167]["Data"][0];
$serialNo = $makerNote[29]["Data"][0];
$lensDataVer = substr($makerNote[0x98]['Data'],0,4);

$offset = -0x04;
$nikonLensDataRaw = substr($makerNote[0x98]['Data'],4);
$nikonLensDataDecrypted = _decryptNikonDataBlock($nikonLensDataRaw,$serialNo,$shutterCount);
$nikonLensIDRaw = array_slice($nikonLensDataDecrypted, 0x0c+$offset, 7);
$nikonLensIDRaw[] = $makerNote[0x83]['Data'][0];
$nikonLensID = vsprintf('%02X %02X %02X %02X %02X %02X %02X %02X', $nikonLensIDRaw);

$nikonLens = $NikonLensDB[$nikonLensID];

//var_dump($exif);
var_dump($nikonLens);