JP2015041878A5

JP2015041878A5 -

Info

Publication number: JP2015041878A5
Application number: JP2013171715A
Authority: JP
Filing date: 2013-08-21
Publication date: 2016-09-23
Anticipated expiration: 2033-08-21

Description

上記目的を達成するために、本発明の撮像装置は、被写体を撮影して、画像信号を出力する撮像手段と、測光手段と、前記画像信号の輝度分布を解析する解析手段と、前記画像信号を増幅する増幅手段と、画像信号に対するダイナミックレンジ制御を行う処理手段と、前記増幅手段における増幅率と、前記ダイナミックレンジ制御における補正量とのいずれを優先するかを判定する判定手段と、前記増幅率を優先する場合に、前記増幅率が取り得る値に対して前記補正量が取り得る値の範囲を制限し、前記補正量を優先する場合に、前記補正量が取り得る値に対して前記増幅率が取り得る値の範囲を制限する制限手段と、前記測光手段による測光の結果と、前記解析手段による解析の結果に基づいて、前記制限手段により制限された値の範囲で、前記増幅率及び前記補正量を決定する決定手段とを有する。 In order to achieve the above object, an imaging apparatus according to the present invention includes an imaging unit that captures an image of a subject and outputs an image signal, a photometric unit, an analysis unit that analyzes a luminance distribution of the image signal, and the image signal. and amplifying means for amplifying and processing means for dynamic range control against the images signals, and the amplification factor of the amplifying means, determination means for determining one or priority of the correction amount in the dynamic range control, When giving priority to the amplification factor, the range of values that the correction amount can take is limited to the value that the amplification factor can take, and when giving priority to the correction amount, the value that the correction amount can take A range of values limited by the limiting unit based on a result of photometry by the photometric unit and a result of analysis by the analyzing unit. , And a determination means for determining the amplification factor and the correction amount.

Claims

Imaging means for photographing a subject and outputting an image signal;
Photometric means;
Analyzing means for analyzing the luminance distribution of the image signal;
Amplifying means for amplifying the image signal;
And processing means for dynamic range control against the images signals,
A determination unit that determines which one of the amplification factor in the amplification unit and the correction amount in the dynamic range control is prioritized;
When giving priority to the amplification factor, the range of values that the correction amount can take is limited to the value that the amplification factor can take, and when giving priority to the correction amount, the value that the correction amount can take Limiting means for limiting the range of values that the amplification factor can take;
And determining means for determining the amplification factor and the correction amount within a range of values limited by the limiting means based on the result of photometry by the photometric means and the result of analysis by the analyzing means. An imaging device.

Said limiting means, said by the dynamic range control by amplification and the processing means by the amplifying means such that said image signal degradation becomes lower than the predetermined level, the range and the correction amount of the gain possible values The imaging apparatus according to claim 1, wherein a range of values that can be taken is limited.

A calculation means for calculating the amount of movement of the subject;
3. The determination unit according to claim 1, wherein the determination unit determines to prioritize the amplification factor if the amount of movement exceeds a predetermined amount of movement, and to prioritize the correction amount if the amount of movement does not exceed the predetermined amount. The imaging device described.

A designating unit for designating the amplification factor and the correction amount;
The imaging apparatus according to claim 3, wherein when the fixed value is specified as the correction amount by the specifying unit, the determination unit determines to prioritize the correction amount regardless of the movement amount. .

When the correction amount is specified so that the dynamic range control is not performed by the specifying unit, the determination unit determines that the amplification factor is given priority regardless of the movement amount. The imaging device according to claim 4.

6. The determination unit according to claim 4, wherein if the correction amount is not specified and the amplification factor is specified, the determination unit determines to prioritize the amplification factor regardless of the amount of movement. Imaging device.

A control method in an imaging apparatus having an imaging means for photographing a subject and outputting an image signal, and a photometry means,
An analyzing step for analyzing a luminance distribution of the image signal;
An amplification step in which the amplification means amplifies the image signal;
Processing means, a processing step of performing dynamic range control against the images signals,
A determining step for determining which of the amplification factor in the amplification step and the correction amount in the dynamic range control is prioritized;
When the limiting means gives priority to the amplification factor, the range of values that the correction amount can take is limited to the value that the amplification factor can take, and when the correction amount takes priority, the correction amount takes A limiting step of limiting a range of values that the amplification factor can take with respect to a value to be obtained;
A determining step for determining the amplification factor and the correction amount within a range of values limited in the limiting step based on a result of photometry by the photometric unit and an analysis result in the analyzing step; A control method comprising:

The program for making a computer perform each process of the control method of Claim 7.

A computer-readable storage medium storing the program according to claim 8.