JPWO2016185709A1 - 赤外線撮像装置及び固定パターンノイズデータの更新方法 - Google Patents
赤外線撮像装置及び固定パターンノイズデータの更新方法 Download PDFInfo
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- 238000003331 infrared imaging Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 claims abstract description 131
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Abstract
Description
11:赤外線検出器
12:アナログ信号処理部
13:AD変換器
14:デジタル信号処理部
15:出力部
16:焦点調整機構
17:位置センサ
18:温度センサ
19:制御部
41:スイッチ
42:ノイズ補正処理部
43:FPNデータ記憶部
44:ノイズデータ更新処理部
51:信号平均値計算部
52:FPN平均値計算部
53、54:減算器
55:データ更新部
56:フレームメモリ
57:判定部
100:赤外線撮像装置
S1〜S5、S11〜S15:信号成分
FPN1〜FPN5:固定パターンノイズ成分
DS1〜DS5、DS11〜DS15:赤外線検出信号
Claims (11)
- 結像位置の制御が可能な光学系と、
入射赤外線を検出する複数の検出器素子を含み、前記光学系を介して赤外線検出面に赤外線が入射される赤外線検出器と、
前記複数の検出器素子により検出された赤外線の検出信号から固定パターンノイズデータを減算することにより、前記赤外線の検出信号から固定パターンノイズを除去するノイズ補正処理部と、
前記光学系の結像位置を制御する焦点制御部と、
前記焦点制御部が前記光学系の結像位置を制御して前記光学系を非合焦状態とした状態で前記複数の検出器素子により検出された赤外線の検出信号に基づいて固定パターンノイズ成分の量を算出し、該算出した固定パターンノイズ成分の量で前記固定パターンノイズデータを更新するノイズデータ更新処理部とを備え、
前記ノイズデータ更新処理部は、固定パターンノイズ成分の量を算出する処理の対象の各検出器素子について、当該検出器素子を含めた周辺の複数の検出器素子の検出信号の平均値を算出し、該算出した平均値から更新前の固定パターンノイズデータの平均値を減算することにより当該検出器素子の検出信号に含まれる入射赤外線に依存する信号成分を算出し、当該検出器素子の検出信号から前記算出した信号成分を減算することにより、固定パターンノイズ成分の量を算出することを特徴とする赤外線撮像装置。 - 前記ノイズデータ更新処理部は、各検出器素子について、前記算出した固定パターンノイズ成分の量と更新前の固定パターンノイズデータとの差を計算し、該差が第1のしきい値以下である検出器素子について、前記算出した固定パターンノイズ成分の量で前記固定パターンノイズデータを更新する請求項1に記載の赤外線撮像装置。
- 前記ノイズデータ更新処理部は、前記差が前記第1のしきい値より大きい検出器素子については、前記固定パターンノイズデータの更新を行わない請求項2に記載の赤外線撮像装置。
- 前記ノイズデータ更新処理部は、ある領域について、当該領域における前記差が第1のしきい値よりも大きい検出器素子の数の割合が第2のしきい値よりも高いときは、当該領域に含まれる検出器素子について、前記固定パターンノイズデータの更新を行わない請求項2又は3に記載の赤外線撮像装置。
- 前記ノイズデータ更新処理部は、注目する検出器素子を含めた該注目する検出器素子の周辺に存在する検出器素子の検出信号を加算し、前記平均値を算出する請求項1から4何れか1項に記載の赤外線撮像装置。
- 前記平均値は、注目する検出器素子を含めた該注目する検出器素子の周辺に存在する検出器素子の検出信号を重み付け加算し、加重平均を算出することで得られる加重平均値である請求項5に記載の赤外線撮像装置。
- 重み付け加算において各検出器素子に乗算される重みは、各検出器素子と前記注目する検出器素子との距離に応じて設定される請求項6に記載の赤外線撮像装置。
- 前記重みは、前記注目する検出器素子との距離が短いほど大きく設定される請求項7に記載の赤外線撮像装置。
- 周辺温度を計測する温度計測部を更に備え、前記ノイズデータ更新処理部は、温度計測部が計測する周辺温度と前回の固定パターンノイズデータの更新時の周辺温度との差が温度差しきい値以上となると、前記固定パターンノイズデータの更新を行う請求項1から8何れか1項に記載の赤外線撮像装置。
- 前記ノイズデータ更新処理部は、周期的に繰り返し前記固定パターンノイズデータの更新を行う請求項1から9何れか1項に記載の赤外線撮像装置。
- 複数の検出器素子を含む赤外線検出器における固定パターンノイズを示す固定パターンノイズデータの更新方法であって、
結像位置の制御が可能な光学系を制御し、前記赤外線検出器に入射する赤外線を非合焦状態にするステップと、
前記非合焦状態に制御された状態で前記複数の検出器素子により検出された赤外線の検出信号に基づいて固定パターンノイズ成分の量を算出するステップと、
前記算出された固定パターンノイズ成分の量で前記固定パターンノイズデータを更新するステップとを有し、
前記固定パターンノイズ成分の量を算出するステップでは、処理対象の各検出器素子について、当該検出器素子を含めた周辺の複数の検出器素子の検出信号の平均値を算出し、該算出した平均値から更新前の固定パターンノイズデータの平均値を減算することにより当該検出器素子の検出信号に含まれる入射赤外線に依存した信号成分を算出し、当該検出器素子の検出信号から前記算出した信号成分を減算することにより、固定パターンノイズ成分の量を算出することを特徴とする固定パターンノイズデータの更新方法。
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US10523883B2 (en) | 2019-12-31 |
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