JP2014032311A5

JP2014032311A5 - Ranging device, imaging device including the same, focus evaluation method, and program

Info

Publication number: JP2014032311A5
Application number: JP2012172938A
Authority: JP
Filing date: 2012-08-03
Publication date: 2015-09-17
Anticipated expiration: 2032-08-03

Description

上記課題を解決するため、本発明によれば、撮影光学系の異なる瞳領域からの光束を受光する画素を含む撮像素子から出力される画素信号を取得してピント評価を行なう測距装置は、瞳分割手段で分割される複数の瞳領域の各領域に対応する画素を選択する第１の画素選択モードと、前記複数の瞳領域の所定の異なる２つに対応する画素だけを選択する第２の画素選択モードを選択して設定し、設定された画素選択モードで選択される画素から出力される画素信号を取得し、取得された画素信号に基づいて、前記第１の画素選択モードに従って取得された画素信号から得られる像のコントラストに基づくピント評価、および前記第２の画素選択モードに従って取得された画素信号から得られる像の位相差に基づくピント評価のいずれかによりピント評価を行なう。
To solve the above problems, the present invention, the distance measuring apparatus obtains the pixel signal output from the image sensor performs the focus evaluation including pixels for receiving light beams from different pupil areas of projection optical system Taking the A first pixel selection mode for selecting pixels corresponding to each of the plurality of pupil regions divided by the pupil dividing means, and a first pixel selection mode for selecting only pixels corresponding to two different predetermined ones of the plurality of pupil regions. 2 pixel selection modes are selected and set, a pixel signal output from a pixel selected in the set pixel selection mode is acquired, and based on the acquired pixel signal, according to the first pixel selection mode focus evaluation based on the contrast of images obtained from the acquired pixel signals, and by any of the focus evaluation based on the phase difference of the resulting image from pixel signals acquired in accordance with the second pixel selection mode Performing a cement evaluation.

Claims

In the distance measuring apparatus for performing the focus evaluation by obtaining a pixel signal output from the image sensor including the pixel for receiving light beams from different pupil areas of projection optical system shooting,
Selecting a first pixel selection mode for selecting the pixels corresponding to the respective regions of a plurality of pupil areas divided by the front Kihitomi dividing means, only the pixels corresponding to the predetermined, two different of said plurality of pupil areas Pixel selection means for selecting and setting the second pixel selection mode;
A pixel signal acquisition means for acquiring a pixel signal outputted from the pixels selected by the set pixel selected mode,
Based on the obtained pixel signals collected by a first focus evaluation means for focus evaluation based on the contrast of the image obtained from the pixel signal obtained in accordance with the first pixel selection mode,
Second focus evaluation means for performing focus evaluation based on a phase difference of an image obtained from a pixel signal acquired in accordance with the second pixel selection mode ,
A distance measuring apparatus characterized in that focus evaluation is performed by one of the first focus evaluation means and the second focus evaluation means .

The first focus evaluation unit is predetermined from a pixel signal acquired from a pixel selected in the first pixel selection mode based on a pupil region specified by the pupil division unit and a state of the photographing optical system. The distance measuring apparatus according to claim 1 , further comprising a developing unit that generates an image on the focus evaluation surface.

The developing means includes an image shift means for giving different shift amounts to pixels corresponding to each pupil region specified by the pupil dividing means in order to generate an image on the predetermined focus evaluation plane, and the image shift means. The distance measuring apparatus according to claim 2, further comprising: an image generating unit that adds pixel signals acquired from the pixels selected in the first pixel selection mode according to a shift amount.

Further comprising an imaging condition acquisition unit that acquires the imaging conditions include information of the photographing condition is least measurement also ranged positions and measurement frame,
The pixel selecting means, on the basis of the imaging condition decided one by one performs the focus evaluation of the first focus evaluating means and said second focus evaluating means, sets a pixel selection mode according to the focus evaluation was determined boss The distance measuring apparatus according to claim 1, wherein:

The camera further comprises a shooting condition acquisition means for acquiring a shooting condition, and the shooting condition includes information on at least a distance measuring point and a distance measuring frame,
The pixel selection unit determines which of the first focus evaluation unit and the second focus evaluation unit performs the focus evaluation based on the photographing condition, and sets a pixel selection mode according to the determined focus evaluation. The distance measuring device according to claim 2 or 3, wherein

The said pixel selection means sets the thinning-out rate by the pixel selection in the said 1st pixel selection mode and 2nd pixel selection mode based on the said imaging | photography condition, The Claim 4 or 5 characterized by the above-mentioned. Ranging device.

6. The distance measuring apparatus according to claim 5, wherein the first focus evaluation unit determines the predetermined focus evaluation surface based on the photographing condition.

8. The method according to claim 1, wherein which of the first focus evaluation unit and the second focus evaluation unit performs the focus evaluation is determined based on a contrast of an image obtained from the pixel signal. The distance measuring device according to any one of the above.

9. The method according to claim 1, wherein which of the first focus evaluation unit and the second focus evaluation unit performs focus evaluation is determined based on a phase difference of an image obtained from the pixel signal. The distance measuring device according to any one of the above.

10. The method according to claim 1, wherein which of the first focus evaluation unit and the second focus evaluation unit performs the focus evaluation is determined based on a distance measuring point. 11. Ranging device.

11. The method according to claim 1, wherein which of the first focus evaluation unit and the second focus evaluation unit performs the focus evaluation is determined based on a size of the distance measurement frame. The distance measuring device according to item.

Which of the first focus evaluation unit and the second focus evaluation unit performs the focus evaluation depends on the interval for acquiring the evaluation value related to the contrast of the image obtained from the pixel signal, and the number of the acquired evaluation values 12. The distance measuring device according to claim 1, wherein the distance measuring device is determined based on the distance.

Which of the first focus evaluation unit and the second focus evaluation unit performs the focus evaluation is determined based on a frequency band for performing a filter process of a contrast of an image obtained from the pixel signal. The distance measuring device according to any one of claims 1 to 12.

In focus evaluation method Taking acquires the pixel signal output from the image sensor including the pixel for receiving light beams from different pupil areas of projection optical system performs pin cement evaluation,
Selecting a first pixel selection mode for selecting the pixels corresponding to the respective regions of a plurality of pupil areas divided by the front Kihitomi dividing means, only the pixels corresponding to the predetermined, two different of said plurality of pupil areas A pixel selection step of selecting and setting a second pixel selection mode;
A pixel signal acquisition step of acquiring a pixel signal outputted from the pixels selected by the set pixel selected mode,
Based on the obtained pixel signals collected by a first focus evaluating step of performing focus evaluation based on the contrast of the image obtained from the pixel signal obtained in accordance with the first pixel selection mode,
A second focus evaluation step for performing a focus evaluation based on a phase difference of an image obtained from a pixel signal acquired according to the second pixel selection mode ,
A focus evaluation method comprising performing focus evaluation by any one of the first focus evaluation step and the second focus evaluation step .

In a program for controlling a distance measuring apparatus that obtains a pixel signal output from an image sensor including pixels that receive light beams from different pupil regions of a photographing optical system and performs focus evaluation,
Computer
Selecting a first pixel selection mode for selecting the pixels corresponding to the respective regions of a plurality of pupil areas divided by the front Kihitomi dividing means, only the pixels corresponding to the predetermined, two different of said plurality of pupil areas Selecting and setting a second pixel selection mode;
Obtaining a pixel signal outputted from the pixels selected by the set pixel selected mode,
Preparative based on obtained pixel signals, a first focus evaluating step of performing focus evaluation based on the contrast of the resulting image from the first pixel signals acquired in accordance with the pixel selection mode,
A second focus evaluation step for performing focus evaluation based on a phase difference of an image obtained from a pixel signal acquired according to the second pixel selection mode,
A program for causing a function to perform focus evaluation in any one of the first focus evaluation step and the second focus evaluation step .

A computer-readable storage medium storing the program according to claim 15 .

A program that causes a computer to function as each unit of the distance measuring device according to any one of claims 1 to 13 .

A storage medium storing a program that causes a computer to function as each unit of the distance measuring device according to any one of claims 1 to 13 .

Photographic optics,
An image sensor;
Pupil dividing means for limiting subject light incident on the pixels of the image sensor to a specific pupil region of the photographing optical system;
A distance measuring device according to any one of claims 1 to 13 ,
Driving means for driving the photographing optical system according to the focus evaluation of the distance measuring device;
Accordance imaging conditions, and control means for photographing the object by controlling the imaging optical system and the distance measuring device,
An imaging apparatus comprising:

Setting means for setting the shooting conditions;
The photographing condition is least measurement also ranged positions, the imaging apparatus according to claim 19, characterized in that it comprises the information of the distance measurement frame.