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動画マッピングのノウハウ
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激辛オープンストリートマップ ステップアップ勉強会(2015-03-28)の資料です。
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動画マッピングのノウハウ
1.
動画マッピング 激辛オープンストリートマップステップアップ勉強会 2015-03-28 T-MZ
2.
データ収集手法の位置づけ 動画カメラ 収集量:大 pushpin 紙 マッピングに専念 ながら収集 頭で記憶 収集量:小 スチルカメラ
3.
動画マッピングの特徴 ● メリット – 乗り物に乗りながらデータ収集が可能 ●
自転車、オートバイ、車、電車 ● 旅行中に記録 – 当初OSMデータ化しなかった動画も再利用できる ● デメリット – 目標物が記録できない場合あり ● 街路樹や通行人で看板が隠れていたなど ● 必ず記録したい地物は他の手段(デジカメなど)で補完 – 詳細な情報(細かい文字)抽出には不向き
4.
後で再確認可能 富山県内を撮影中、知らずに 北陸新幹線の下をくぐっていた :撮影方向 北陸新幹線 新高岡駅
5.
昔の映像との比較 2013年1月 2014年6月
6.
商店街も手押し自転車ならOK 国道なのに商店街なので 昼は自転車も走行禁止
7.
GPSログとの対応づけ ● JOSMのvideomappingプラグインは実用レベルではな い – カメラ用ファイル(MJPEG
or MPEG4 AVC/H.264)が再生で きない – プラグインが不安定で、頻繁に不正終了する – 開始時刻を動画とGPSログで一致させておく必要がある ● AviUtl用プラグインを自作しました – http://tmz.skr.jp/programs/gpspos.html ● 「JOSM AviUtl」でググっても行けます – AviUtl用の各種プラグインと組み合わせることで、任意の ファイル形式に対応 – LinuxやMacでは、Wineを併用すると動作するようです
8.
撮影のノウハウ
9.
撮影方向の試行錯誤 Bing画像 :撮影方向 問題点: (1)店名が見えない (2)正確な場所が分からない 大体 この辺なんだけど・・ 撮影画像
10.
撮影イメージ(1) この辺りを 特に記録したい サイドビュー(カメラを左向き/右向き)に撮影するのが最適 町並みは、 道路に平行方向の看板が多い カメラを前方に向けた場合、 地物の正確な位置特定が困難
11.
撮影イメージ(2) カメラを縦長に使うのが効率的 普通に撮影時(横長) 横倒しで撮影時(縦長) 横倒しのほうが広範囲の画像を撮影できる
12.
画角の検討 建物 2階の 下部くらい 5m 4m 車道 路側帯・歩道 1m 路側帯も視野に入れたい(後述)ので 上下方向は水平くらいがよい 4m 45°45° 上下方向の画角として90°欲しい 1m 画角90° 16:9カメラの視野 90°× √16 2 +9 2 16 =103.26°画角103° 画角100°前後のカメラを 横倒しで使えばいい 45°45°
13.
自転車へのカメラ取り付け例 撮影方向
14.
時間帯(朝が良い場合) 通行人が多い時間帯は 映したいものが映らないことも
15.
時間帯(夜が良い場合) 昼にシャッターが降りていると 夜営業の店なのか 店を畳んだのか分かりにくい
16.
道なりに動くべし GPSの精度は方向が特定できるほど高くない! 道路に沿った方向転換だからこそ位置を特定可能 GPSログ
17.
道路の画像も重要 Bing画像 道路上のペイント(横断歩道)から Bing写真上の位置を特定できる Bingは写真が古く、建物がまだない 撮影画像
18.
ノウハウ(まとめ) ● カメラの画角は100~120°くらいが良い – 170°など広角では物が小さく映るため、文字判別が困難 ● 目標とする地物によって適した時間帯が異なる –
電話ボックスなど24H不変な物は人通りの少ない早朝 – 居酒屋は夜 ● 撮影中は、道なりに走るべし – 寄り道が多いと、どちらを向いているか分からなくなる ● 建物だけでなく、地面も撮影することが重要 – 交差/分岐する道を確実に判別できる – 横断歩道などを衛星画像から探して位置を特定 ● 練習は必須 – 撮影したいものやカメラにより状況はいろいろ
19.
参考 ● Video mapping
(wiki) – http://wiki.openstreetmap.org/wiki/Video_mapping
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