JP2018021971A5

JP2018021971A5 - FOCUS DETECTION DEVICE, IMAGING DEVICE, AND FOCUS DETECTION METHOD

Info

Publication number: JP2018021971A5
Application number: JP2016151419A
Authority: JP
Filing date: 2016-08-01
Publication date: 2019-09-12
Anticipated expiration: 2036-08-01

Description

本発明は焦点検出装置、撮像装置、および焦点検出方法に関し、特には自動焦点検出技術に関する。 The present invention is a focus detection apparatus, imaging apparatus, and relates to a focus detecting method and, more particularly, to an automatic focus detection technique.

上記の課題を解決するために、本発明の焦点検出装置は、撮影光学系の収差情報を取得する取得手段と、前記取得した収差情報から、画像の画像特性または評価特性から算出される撮像合焦位置と、焦点検出手段の焦点検出特性から算出される焦点検出合焦位置から第１補正値を算出し、前記焦点検出合焦位置と、位相差焦点検出方式で検出される位相差焦点検出合焦位置から第２補正値を算出し、前記第１補正値と前記第２補正値から焦点検出補正値を算出する算出手段と、を有する。 In order to solve the above-described problems, the focus detection apparatus of the present invention includes an acquisition unit that acquires aberration information of a photographing optical system, and an imaging combination calculated from image characteristics or evaluation characteristics of an image from the acquired aberration information. and focus position, and calculates a first correction value from the focus detection focus position calculated from the focus detection characteristic of the focus detection means, the focus detection focus position, the phase difference focus detection is detected by the phase difference focus detection method calculating a second correction value from the in-focus position, that having a, a calculation unit that to calculate the focus detection correction value from said second correction value and the first correction value.

Claims

Acquisition means for acquiring aberration information of the imaging optical system;
From the acquired aberration information, a first correction value is calculated from the imaging focus position calculated from the image characteristics or evaluation characteristics of the image and the focus detection focus position calculated from the focus detection characteristics of the focus detection means ,
Calculating a second correction value from the focus detection focus position and the phase difference focus detection focus position detected by the phase difference focus detection method ;
A calculation unit that to calculate the focus detection correction value from said second correction value and the first correction value,
A focus detection apparatus comprising:

The first correction value is a difference between the imaging focus position and the focus detection focus position, and the second correction value is a difference between the focus detection focus position and the phase difference focus detection focus position. The focus detection apparatus according to claim 1, wherein:

The phase difference focus detection focus position is calculated based on a positional deviation amount of a line image intensity distribution of the imaging optical system detected by the phase difference focus detection method. The focus detection apparatus described.

Before SL calculation means, when not using the phase difference focus detection method, any one of the preceding claims, characterized in that to calculate the focus detection correction value by using only the first correction value 1 The focus detection apparatus according to the item.

Before SL calculating means, when the difference of the image focus position and the phase difference focus detection in-focus position is small, by using only the first correction value to calculate the focus detection correction value, the difference is not smaller 5. The focus detection apparatus according to claim 1, wherein the focus detection correction value is calculated from the first correction value and the second correction value.

The focus detection apparatus according to any one of claims 1 to 5,
Control means for controlling the position of the focus lens of the photographing optical system based on the result of focus detection corrected by the focus detection correction value;
An imaging apparatus comprising:

  The first correction value is calculated from the imaging focus position calculated from the image characteristic or evaluation characteristic of the image and the focus detection focus position calculated from the focus detection characteristic of the focus detection means from the aberration information of the photographing optical system. 1 calculation step;
  A second calculation step of calculating a second correction value from the focus detection focus position and the phase difference focus detection focus position detected by the phase difference focus detection method;
  A third calculation step of calculating a focus detection correction value from the first correction value and the second correction value;
Have
A focus detection method characterized by the above.