JP2011048097A5

JP2011048097A5 -

Info

Publication number: JP2011048097A5
Application number: JP2009195846A
Authority: JP
Filing date: 2009-08-26
Publication date: 2012-10-04
Anticipated expiration: 2029-08-26

Description

ステップＳ５０８で、カメラ制御部１０１は、カメラＲＯＭ１０２に記憶された第１フラッシュの予備発光による被写体の反射光の情報と、第２フラッシュの予備発光による被写体の反射光の情報から、第１フラッシュ及び第２フラッシュの本発光量を決定する。例えば、第１フラッシュの本発光量は、第１フラッシュの予備発光による被写体の反射光を各エリアで加重平均した値ΔＦと、第１フラッシュと第２フラッシュの露光処理での発光の光量比Ｃ＿ｒａｔｉｏを用いて周知の演算方法で演算し決定する。発光量の演算は、例えば、予備発光の発光量と露光処理での光量との比Ｇとして、以下のように求める。
Ｇ＝ｔａｒｇｅｔ − ΔＦ＋Ｃ＿ｒａｔｉｏ
ここで、ｔａｒｇｅｔは、撮影時に使用される絞り値とシャッター秒時と露光感度に応じて決まる露光量のことである。また、露光処理での発光の光量比Ｃ＿ｒａｔｉｏは、ユーザによって任意の比率に設定可能である。カメラ制御部１０１は、第１フラッシュと第２フラッシュの２灯合わせて適正露出の発光量となったときの、光量比がＣ＿ｒａｔｉｏとなるように、第１フラッシュ及び第２フラッシュそれぞれの発光量を決定する。 In step S <b> 508, the camera control unit 101 calculates the first flash and the reflected light of the subject by preliminary light emission of the first flash and the information of reflected light of the subject by preliminary light emission of the second flash stored in the camera ROM 102. The amount of main light emission of the second flash is determined. For example, the main light emission amount of the first flash is calculated by weighting and averaging the reflected light of the subject by the preliminary light emission of the first flash in each area, and the light amount ratio C_ratio of light emission in the exposure processing of the first flash and the second flash. Is calculated and determined by a known calculation method. The calculation of the light emission amount is obtained as follows, for example, as a ratio G between the light emission amount of the preliminary light emission and the light amount in the exposure process.
G = target-ΔF + C_ratio
Here, the target is an exposure amount determined according to an aperture value used at the time of shooting, a shutter time, and an exposure sensitivity. The light emission ratio C_ratio of light emission in the exposure process can be set to an arbitrary ratio by the user. The camera control unit 101, when a light emission amount of appropriate exposure depending two lamps of the first flash and a second flash, so that the light quantity ratio becomes C_ratio, the light emission amount of each of the first flash and second flash decide.

Claims

An imaging device capable of photographing using an illumination device that emits light toward a subject,
Imaging means for imaging a subject;
Metering means for metering the subject;
Based on a non-light-emission photometric value obtained by the photometry means when the illuminating device is not lit, and a preliminary light-emission photometric value obtained during the preliminary luminescence performed prior to the main luminescence of the illuminating device, Calculating means for calculating the main light emission amount of the apparatus,
When the calculation unit continuously calculates a plurality of main flash amounts, if the non-light-emission photometric value obtained by the photometry unit is less than or equal to a predetermined value before the first main flash amount calculation, Calculating the respective main light emission amounts based on the non-light emission photometric values used for calculating the main light emission amounts and the preliminary light emission photometric values obtained during the preliminary light emission performed prior to each main light emission. An imaging device that is characterized.

When the calculation means continuously calculates a plurality of main light emission amounts, if the non-light emission photometric value used for the calculation of the first main light emission amount is equal to or less than a predetermined value, The imaging apparatus according to claim 1, wherein each main light emission amount is calculated based on the preliminary light-emission photometric value obtained during the preliminary light emission performed prior to the main light emission.

A calculation instruction receiving means for receiving a calculation instruction for calculating a main light emission amount of the lighting device without imaging by the imaging means;
When the light metering means calculates a plurality of main light emission amounts continuously according to the calculation instruction received by the calculation instruction reception means, the non-light emission time obtained by the photometry means before the calculation of the first main light emission amount 3. The image pickup apparatus according to claim 1, wherein the smaller the photometric value, the longer the interval between the preliminary light emission by the illumination device and the next time the non-light-emission photometry is performed.

The imaging apparatus according to claim 1, wherein the predetermined value is a value determined in advance as a photometric value that can ignore flicker that is external light.

An imaging apparatus control method comprising: an imaging unit that images a subject; and a photometric unit that performs photometry of the subject, and capable of shooting using an illumination device that emits light toward the subject,
The computing means of the imaging device is a non-light-emission photometric value obtained by the photometry means when the illuminating device is not lit, and a preliminary light-emission photometry obtained during the preliminary luminescence performed prior to the main luminescence of the illuminating device. A calculation step of calculating a main light emission amount of the lighting device based on the value,
When the calculation means calculates a plurality of main light emission amounts continuously in the calculation step , the non-light-emission photometric value obtained by the photometry means before the first main light emission amount calculation is not more than a predetermined value. For example, based on the non-light-emission photometric value used for the calculation of the first main light emission and the preliminary light-emission photometric value obtained during the preliminary light emission performed prior to each main light emission, the respective main light emission amounts are calculated. A control method for an imaging apparatus, characterized by: