PROBLEM TO BE SOLVED: To detect a driver state always with high accuracy even when the driver moves the driver seat back and forth.SOLUTION: The focal position of a car onboard camera of fixed focus type (position in best focus) is set at a position such as the following. That is, the focal position is set at a position at which a blur circle for the position of the face of a driver when the position of the driver seat is moved to a forward limit (front limit face position) is larger than a blur circle for the position of the face of the driver when the position of the driver seat is moved to a backward limit (rear limit face position). It is thereby made possible to suppress the face image from blurring at the rear limit face position, since the focal position of the car onboard camera can be moved backward. As a result, even when a blur in the face image is magnified at the rear limit face position, the driver state can always be detected with high accuracy.

    【課題】運転者が運転席を前後に移動した場合でも運転者状態を常に精度良く検出する。【解決手段】固定焦点式の車載カメラの焦点位置(最もピントが合う位置)を次のような位置に設定する。すなわち、運転席の位置を後方の限界まで移動させた時の運転者の顔面の位置(後方限界顔面位置)に対する錯乱円よりも、運転席の位置を前方の限界まで移動させた時の運転者の顔面の位置(前方限界顔面位置)に対する錯乱円の方が大きくなる位置に、焦点位置を設定する。こうすれば、車載カメラの焦点位置を後方に移動させることができるので、後方限界顔面位置での顔画像のボケを抑制することができる。その結果、後方限界顔面位置での顔画像中のボケが拡大されても、常に精度良く運転状態を検出することが可能となる。【選択図】図11


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    Title :

    FACE IMAGE CAPTURING DEVICE AND DRIVER STATE DETERMINATION DEVICE


    Additional title:

    顔画像撮影装置、および運転者状態判定装置


    Contributors:

    Publication date :

    2015-06-25


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G03B APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM , Geräte oder Anordnungen zum Aufnehmen, Projizieren oder Betrachten von Fotografien / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / G06T Bilddatenverarbeitung oder Bilddatenerzeugung allgemein , IMAGE DATA PROCESSING OR GENERATION, IN GENERAL / H04N PICTORIAL COMMUNICATION, e.g. TELEVISION , Bildübertragung, z.B. Fernsehen




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