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Raspi multispectrumcamera enya
1.
エンヤヒロカズです。
2.
自己紹介 • エンヤヒロカズはペンネーム。 • 本職は某電機メーカーエンジニア。 •
技術領域は仕事と被っているが、あくまで「業 務外の自己啓発活動」。
3.
カメラネタ執筆しています。 が、最近はラズパイおじさんと化しています。
4.
本日のお題 ラズパイでマルチスペクトルカメラの 製作 & 分光計の製作
5.
マルチスペクトルカメラ 可視領域光で4バ ンド、赤外領域で1 バンド 350 450 550
650 750 850 950 1050 波長[nm]
6.
CMOSセンサの分光感度特性 Micron MT9V111仕様書より 650nm以降の近赤 外領域でも感度を 持っている
7.
PiNoir IRCFが搭載されて いない イメージセンサは IMX219
8.
IRCFの有無 • IRCF有り • IRCF無し IR成分の多く含む植物の 色再現が悪くなる
9.
セラテックジャパンのwebサイト
10.
RGBフィルターの特性
11.
市販カメラの波長 カメラA カメラB 中心波長 [nm] 半値幅 [nm] 中心波長 [nm] 半値幅 [nm] ブルー 475
20 - - グリーン 560 20 500 40 レッド 668 10 660 40 レッドエッジ 717 10 735 10 近赤外線 840 40 790 40
12.
赤外線バンドパスフィルターの特性 700nm 740nm 810nm 半値幅は約30nm
13.
14.
カメラ構造
15.
フィルター搬送部の構造 モーター ギア フィルタ PiNoir
16.
フィルター
17.
フィルタ改良案
18.
撮影風景
19.
写真6-1 filterなし
20.
写真6-2 IRCFのみ
21.
写真6-4 G+IRCF
22.
写真6-5 R+IRCF
23.
写真6-6 IR BPF
700nm
24.
写真6-7 IR BPF
740nm
25.
写真6-8 IR BPF
810nm
26.
表1 撮影画像のISO感度とシャッター速 ISO感度 シャッター速度 Blue+IRCF
50 1/674sec Green+IRCF 50 1/730sec Red+IRCF 50 1/665sec IR 700nm 50 1/634sec IR 740nm 50 1/243sec IR 810nm 50 1/196sec フィルタ無し 50 1/1923sec IRCFのみ 50 1/1114sec
27.
図7 QGISのラスタ計算機 NDVIの計算式をそのまま 入力すると、画像間の演算 を行うことができる。
28.
29.
分光計の製作
30.
31.
市販のフィルタ Arduinoの拡張基 板上に分光器を 作成した。
32.
測定風景 露光時間がマイコンの動作速度で律速されているので NDフィルタで減光して測定した
33.
Arduino IDEシリアルプロッタ画面 クロックに対する波長の 関係(線形ではない) 実際の測定結果
34.
0 200 400 600 800 1000 1200 300 350 400
450 500 550 600 650 700 750 800 850 900 グラフ タイトル 太陽光+ND 太陽光+ND+赤 フィルタ 測定結果
35.
C12880 MAの分光感度特性
36.
0 200 400 600 800 1000 1200 300 350 400
450 500 550 600 650 700 750 800 850 900 グラフ タイトル 太陽光+ND 太陽光+ND+赤 フィルタ 測定結果と分光特性を重ねると
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