IMAGING DEVICE, METHOD FOR CONTROLLING IMAGING DEVICE, AND FOCUS CONTROL PROGRAM

• Main Author: MIZUNO NOBUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 24.05.2018
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

PROBLEM TO BE SOLVED: To obtain an excellent focus state in the evaluation of a picked-up image when image blur affects easily.SOLUTION: An imaging device 120 includes: focus detection means 129 for detecting the focus state of an imaging optical system and generating focus detection information; correction value acquisition means 125 for acquiring a correction value for correcting the focus detection information; and control means 125 for conducting a focus control, using the focus detection information corrected by the correction value. The correction value includes a first evaluation bandwidth as a variable, which is a spacial frequency for evaluating the focus state of a picked-up image generated by imaging by the imaging optical system. The first evaluation bandwidth when a first exposure time as an exposure time at imaging is longer than a first specific time is smaller than that when the first exposure time is shorter than the first specific time.SELECTED DRAWING: Figure 1 【課題】像振れの影響を受けやすい場合においても、撮像画像の評価において良好な焦点状態が得られるようにする。【解決手段】撮像装置１２０は、撮像光学系の焦点状態を検出して焦点検出情報を生成する焦点検出手段１２９と、焦点検出情報を補正するための補正値を取得する補正値取得手段１２５と、補正値により補正された焦点検出情報を用いてフォーカス制御を行う制御手段１２５とを有する。補正値は、撮像光学系を用いた撮像により生成された撮像画像の焦点状態が評価される空間周波数である第１の評価帯域を変数として含む。撮像時の露光時間である第１の露光時間が第１の所定時間より長い場合の第１の評価帯域は、第１の露光時間が第１の所定時間より短い場合の第１の評価帯域に比べて低い。【選択図】図１