DROWSINESS DETECTOR AND PROGRAM FOR DROWSINESS DETECTION
To provide a drowsiness detector and a program for the drowsiness detection capable of improving accuracy of drowsiness detection.SOLUTION: A PERCLOS calculation unit 33 calculates a PERCLOS, which is a time ratio that a driver is closing his or her eyes for a fixed time Ta, on the basis of an image...
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| Format: | Patent |
| Sprache: | eng ; jpn |
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| Zusammenfassung: | To provide a drowsiness detector and a program for the drowsiness detection capable of improving accuracy of drowsiness detection.SOLUTION: A PERCLOS calculation unit 33 calculates a PERCLOS, which is a time ratio that a driver is closing his or her eyes for a fixed time Ta, on the basis of an image captured by a camera 2. A drowsiness detection unit 34 detects drowsiness of the driver when the PERCLOS is a threshold or more. A threshold setting unit 35 sets the threshold lower when the initial PERCLOS calculated first from the start of driving is less than a% than when the initial PERCLOS is a% or more.SELECTED DRAWING: Figure 4
【課題】眠気の検出精度向上を図った眠気検出装置及び眠気検出用のプログラムを提供する。【解決手段】ＰＥＲＣＬＯＳ算出部３３が、カメラ２が撮影した画像に基づいて、一定時間Ｔａに運転者が目を閉じている時間割合であるＰＥＲＣＬＯＳを算出する。眠気検出部３４が、ＰＥＲＣＬＯＳが閾値以上のときに運転者の眠気を検出する。閾値設定部３５が、運転開始から最初に算出された初期のＰＥＲＣＬＯＳがａ％未満である場合、初期のＰＥＲＣＬＯＳがａ％以上である場合よりも、閾値を低く設定する。【選択図】図４ |
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