JP2010101972A5

JP2010101972A5 -

Info

Publication number: JP2010101972A5
Application number: JP2008271438A
Authority: JP
Filing date: 2008-10-21
Publication date: 2011-12-08
Anticipated expiration: 2028-10-21

Description

上記目的を達成するために、本発明の自動焦点調節装置は、被写体光学像を変換して得られる画像信号を、予め設定された時間間隔で撮像素子から行毎に順次、読み出す読み出し手段と、前記読み出された画像信号が表す各画像について、被写体を検出し、該検出した被写体を含む領域を各画像の合焦状態の検出に用いる検出領域として設定する設定手段と、前記検出領域の画像信号に基づいて、前記各画像の合焦状態を検出する合焦状態検出手段と、前記合焦状態検出手段により検出された合焦状態と、前記検出領域の前記撮像素子における位置と、前記撮像素子から前記画像信号を読み出す時間間隔とに基づいて、フォーカスレンズを駆動するレンズ駆動量を求める駆動量算出手段とを有し、複数の画像に対して前記合焦状態検出手段により検出を行った場合に、前記駆動量算出手段は、前記撮像素子の読み出しを開始してから前記検出領域の読み出しを開始するまでの前記複数の画像間における時間差で前記時間間隔を調整した時間を求め、該求めた時間と、前記合焦状態とから、前記撮像素子の次の読み出し時における前記被写体の像面移動予想量を求め、該像面移動予想量に基づいて前記レンズ駆動量を求める。 In order to achieve the above object, the automatic focus adjustment apparatus of the present invention includes a reading unit that sequentially reads out an image signal obtained by converting a subject optical image from the image sensor for each row at a preset time interval; A setting unit configured to detect a subject for each image represented by the read image signal and set a region including the detected subject as a detection region used for detecting a focus state of each image; and an image of the detection region Based on the signal, an in-focus state detecting unit that detects an in-focus state of each image, an in-focus state detected by the in-focus state detecting unit, a position of the detection region in the image sensor, and the imaging Drive amount calculation means for obtaining a lens drive amount for driving the focus lens based on a time interval for reading out the image signal from the element, and the focus state detection means for the plurality of images. When the detection was performed Ri, the drive amount calculating means, and adjusts the time interval in the time difference between the plurality of images from the start of reading of the image sensor to the start of reading of the detection area seek time, the a while when determined from said focus state, obtains the image plane movement expected amount of the subject at the time of the next reading of the image sensor, the lens driving based on the image surface predicted movement amount Find the amount.

また、本発明の自動焦点調節方法は、読み出し手段が、被写体光学像を変換して得られる画像信号を、予め設定された時間間隔で撮像素子から行毎に順次、読み出す読み出し工程と、設定手段が、前記読み出された画像信号が表す各画像について、被写体を検出し、該検出した被写体を含む領域を各画像の合焦状態の検出に用いる検出領域として設定する設定工程と、合焦状態検出手段が、前記検出領域の画像信号に基づいて、前記各画像の合焦状態を検出する合焦状態検出工程と、駆動量算出手段が、前記合焦状態検出工程で検出された合焦状態と、前記検出領域の前記撮像素子における位置と、前記撮像素子から前記画像信号を読み出す時間間隔とに基づいて、フォーカスレンズを駆動するレンズ駆動量を求める駆動量算出工程とを有し、複数の画像に対して前記合焦状態検出工程における検出を行った場合に、前記駆動量算出工程では、前記撮像素子の読み出しを開始してから前記検出領域の読み出しを開始するまでの前記複数の画像間における時間差で前記時間間隔を調整した時間を求め、該求めた時間と、前記合焦状態とから、前記撮像素子の次の読み出し時における前記被写体の像面移動予想量を求め、該像面移動予想量に基づいて前記レンズ駆動量を求める。 In the automatic focus adjustment method of the present invention, the readout means sequentially reads out the image signal obtained by converting the subject optical image from the image sensor for each row at a preset time interval, and the setting means. state but for each image the read image signal is represented, the object is detected, a setting step of setting a detection area using a region including the subject of the detected the detection of focus state of each image, focusing An in- focus state detecting step in which a detecting unit detects an in-focus state of each image based on an image signal in the detection area, and an in-focus state detected in the in-focus state detecting step by the driving amount calculating unit And a driving amount calculation step for obtaining a lens driving amount for driving the focus lens based on the position of the detection region in the imaging element and the time interval for reading the image signal from the imaging element. In the case where detection in the in-focus state detection step is performed on a plurality of images, in the drive amount calculation step, the plurality of images from the start of reading of the image sensor to the start of reading of the detection area seek time obtained by adjusting the time interval in the time difference between the images, and the time that determined the from said focus state, obtains the image plane movement expected amount of the subject at the time of the next reading of the image sensor, The lens driving amount is obtained based on the predicted image plane movement amount .

Claims

A reading means for sequentially reading out image signals obtained by converting the subject optical image from the image sensor for each row at a preset time interval;
Setting means for detecting a subject for each image represented by the read image signal, and setting a region including the detected subject as a detection region used for detecting the in-focus state of each image;
In-focus state detecting means for detecting the in-focus state of each image based on the image signal of the detection area;
A lens driving amount for driving the focus lens based on the in-focus state detected by the in-focus state detecting unit, the position of the detection region in the image sensor, and the time interval for reading the image signal from the image sensor Driving amount calculation means for obtaining
When the plurality of images are detected by the in-focus state detection unit, the drive amount calculation unit is configured to start the reading of the image sensor and start reading the detection area. seek time obtained by adjusting the time interval in the time difference between the images, and the time that determined the from said focus state, obtains the image plane movement expected amount of the subject at the time of the next reading of the image sensor, An automatic focus adjusting apparatus characterized in that the lens driving amount is obtained based on the predicted image plane movement amount .

The imaging element includes a plurality of pixel pairs that respectively receive light beams that have passed through different pupil regions of the photographing optical system, and the focusing state detection unit is configured to detect a phase difference between image signals output from the plurality of pixel pairs. The automatic focus adjustment apparatus according to claim 1, wherein an in-focus state is detected based on the detection result.

A reading step in which the reading unit sequentially reads out the image signal obtained by converting the subject optical image from the image sensor for each row at a preset time interval;
A setting step in which a setting unit detects a subject for each image represented by the read image signal, and sets a region including the detected subject as a detection region used for detecting a focus state of each image;
An in-focus state detecting unit that detects an in-focus state of each image based on an image signal of the detection area; and
Based on the in- focus state detected in the in-focus state detection step, the position of the detection region in the image sensor, and the time interval for reading the image signal from the image sensor A driving amount calculating step for obtaining a lens driving amount for driving
In the case where detection in the in-focus state detection step is performed on a plurality of images, in the drive amount calculation step, the plurality of images from the start of reading of the image sensor to the start of reading of the detection area seek time obtained by adjusting the time interval in the time difference between the images, and the time that determined the from said focus state, obtains the image plane movement expected amount of the subject at the time of the next reading of the image sensor, An automatic focus adjustment method characterized in that the lens driving amount is obtained based on the predicted image plane movement amount .