JP2017187743A5

JP2017187743A5 -

Info

Publication number: JP2017187743A5
Application number: JP2017017019A
Authority: JP
Filing date: 2017-02-01
Publication date: 2020-03-12
Anticipated expiration: 2037-02-01

Description

本発明にかかる撮像措置の実施形態の一側面は、被写体像を撮像する撮像手段と、前記撮像手段から出力された撮像信号に利得を掛け、前記撮像信号が示す画像の明るさを電子的に変更可能な利得手段と、前記利得手段から出力された撮像信号を用いて周波数帯域の信号を抽出し、抽出した前記信号から焦点信号を生成する焦点信号生成手段と、を有し、前記焦点信号生成手段は、前記利得手段の出力から第１の周波数帯域の信号と、第１の周波数帯域よりも高い周波数帯域である第２の周波数帯域の信号とを抽出し、前記第１の周波数帯域の信号と前記第２の周波数帯域の信号とを合成した合成信号から前記焦点信号を生成し、前記合成信号に占める前記第１の周波数帯域の信号と前記第２の周波数帯域の信号との割合を該利得が高いほど該合成信号に占める該第１の周波数帯域の信号の比率が高くなるように変更することを特徴とする。本発明のその他の側面については発明を実施するための形態で説明をする。 One aspect of an embodiment of an imaging measures according to the present invention includes an imaging means for imaging an object image, multiplied by the gain of the image pickup signal output from said image pickup means, the brightness of the image which the image pickup signal indicates electronically has a changeable gain means, said extracting a signal of a frequency band with a gain means or RaIzuru force has been captured signal, a focus signal generator for generating a focus signal from the extracted said signal, the said A focus signal generation unit that extracts a signal in a first frequency band and a signal in a second frequency band that is higher than the first frequency band from an output of the gain unit; Generating the focus signal from a combined signal obtained by combining the signal of the band and the signal of the second frequency band, and combining the signal of the first frequency band and the signal of the second frequency band in the combined signal. The higher the gain And changes such that the ratio of the first frequency band signal occupying the combined signal is high. Other aspects of the present invention will be described in the embodiments for carrying out the invention.

Claims

Imaging means for imaging a subject image;
Multiplied by the gain of the image pickup signal output from said image pickup means, electronically alterable gain means the brightness of the image which the image signal is shown,
Anda focus signal generator for generating a focus signal from the signal extracting a signal of a frequency band using the extracted said gain means or RaIzuru force has been captured signal,
The focus signal generation unit extracts a signal of a first frequency band and a signal of a second frequency band that is a frequency band higher than the first frequency band from an output of the gain unit, The focus signal is generated from a synthesized signal obtained by synthesizing a signal of a frequency band and a signal of the second frequency band, and a signal of the first frequency band and a signal of the second frequency band occupying the synthesized signal. An image pickup apparatus, wherein the ratio of the signal of the first frequency band to the composite signal increases as the gain increases .

First peak position detecting means for detecting a peak of the focus signal to obtain a vicinity of a focus position;
A second peak position detecting means for detecting a peak of the focus signal by using a detection result of the first peak position detecting means and the focus signal to obtain a focus stop position. Item 2. The imaging device according to Item 1 .

According to claim 2, characterized in that it is produced using a high frequency band signal towards the focus signal to be used for the second peak position detecting means than the focus signal to be used for the first peak position detecting means Imaging device.

A focus signal to be used for the first peak position detection means, the focus signal for the second peak position detection means, according to claim 3, characterized in that it is produced using a signal of the same frequency band Imaging device.

The imaging apparatus according to any one of claims 1 to 4 , wherein the focus signal generation unit lowers a frequency band used for generating the focus signal as the gain increases.

Using a plurality of the focus signals generated by the focus signal generation means, peak position detection means for detecting a peak of the focus signal,
And a gain stability determining means for determining whether or not the gain is stable,
The focus signal generation unit generates a plurality of focus signals by generating the focus signal corresponding to each of a plurality of focus positions,
The peak position detecting means is generated using the imaging signal determined to be the imaging signal output from the gain means after the gain is stabilized, based on a determination result of the gain stability determining means. The imaging apparatus according to claim 1, wherein a peak of the focus signal is detected using the focus signal.

The peak position detecting means has first peak position detecting means for detecting a first peak position, and second peak position detecting means for detecting a second peak position,
The first peak position detecting means detects the peak position of the focus signal using the focus signal acquired at a wider focus position interval than the second peak position detecting means,
The second peak position detecting means uses the focus signal generated using the imaging signal output from the gain means after the gain is stabilized by the gain stability determining means, and the second peak position detecting means uses the focus signal. The imaging device according to claim 6 , wherein the position is detected.

The focus signal used for the first peak position detection by the first peak position detection means is higher than the focus signal used for the second peak position detection by the second peak position detection means. The imaging apparatus according to claim 7 , wherein the focus signal is obtained by moving the focus position quickly.

The gain stability judging means is configured to detect the gain between the detection of the first peak position by the first peak position detecting means and the detection of the second peak position by the second peak position detecting means. The imaging apparatus according to claim 7, wherein it is determined whether or not is stabilized.

The peak position detection unit uses the focus signal generated using the imaging signal output from the gain unit when the gain is determined to be stable by the gain stability determination unit. The imaging device according to claim 7, wherein a peak of the focus signal is detected.

Said peak position detecting means, when the gain is less than the threshold value, regardless of the result of the stability judgment means of the gain, any one of claims 7 to 10, characterized in that detecting the peak position An imaging device according to claim 1.

A signal in a first frequency band and a signal in a second frequency band higher than the first frequency band are used by multiplying an image signal by a gain and using an image signal obtained by electronically changing the brightness of an image. An extraction step of extracting a signal and
A combining step of outputting a combined signal obtained by combining the signal of the first frequency band and the signal of the second frequency band;
The ratio of the signal of the first frequency band to the signal of the second frequency band in the synthesized signal is set such that the higher the gain, the higher the ratio of the signal of the first frequency band to the synthesized signal. And a changing step of changing the signal to a signal.