JP2006126798A - Electronic camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve color reproducibility in an acquired image, in an electronic camera that conducts correction of color temperature characteristics, and to improve the spectral distribution characteristics of flash light. <P>SOLUTION: The electronic camera is equipped with a light-emitting unit 38 for emitting a light, color components of which can be varied; a measuring unit 51 for obtaining color components involved in light from a light source for illuminating an object or light reflected from the object; an input-image processing unit 52 for determining color components of light to be emitted, based on the color components calculated by the measuring unit; and a light-emitting drive unit 39 for making the light-emitting unit emit light involving the color components determined by a determining means in response to an instruction for photographing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic camera, and more particularly, to an electronic camera that corrects a color temperature characteristic and a spectral distribution characteristic of a flash.

  In general, when strobe photography is performed using a person or the like as a subject, when a front light illumination (hereinafter referred to as a front light) is used, the captured image tends to be a flat image. , Rembrandt Light) or side light (hereinafter referred to as side light) or a combination of these, etc., to enhance facial sculpture, shadows and three-dimensional effects, and to achieve fine facial expression. Yes.

  In order to realize the above-described Rembrandt light or side light, an illumination device, an external flash light emitting device, and the like are used. A light emitting member having a large guide number (hereinafter referred to as GN: Guide Number) indicating the intensity of flash light (the amount of emitted light) is used in these lighting devices and external flash light emitting devices. In addition, a mechanism for indirectly illuminating the light by reflecting it on the ceiling or the like, a function of changing the range of the irradiation angle, and extending the reach of the emitted flash light are provided.

  However, when flash photography was performed using a flashlight device, after the flashlight was shot once, the flashlighting device's light-emitting capacitor was fully charged before waiting for the next flash photography. The charging time is increased, the shooting interval is increased, and the shooting opportunity is lost.

  In addition, it is known that the light emitted from the flash light emitting device emits a tuned light if it reaches the light emission possible voltage even if the capacitor is not fully charged. A camera having a function of preferentially starting an exposure operation has been developed. However, in this type of camera, shooting is performed on the assumption that the GN when the capacitor is fully charged is used by the flashmatic means. Therefore, when strobe shooting is performed at a flashable voltage, there is an error in the GN. As a result, an error also occurs in the setting of the aperture diameter determined by the distance from the GN to the subject, resulting in a problem of underexposure.

Therefore, as a flashlight device that can shorten the shooting interval and achieve proper exposure, charging is stopped when the flash reaches a voltage that can force the flash to fire during continuous shooting. Thus, a strobe device has been developed that shortens the charging time and shortens the continuous shooting interval by correcting the control by the flashmatic means (see, for example, Patent Document 1).
Japanese Patent No. 2636296

  However, in the case of the strobe device described above, the color temperature of about 5500 ° C. possessed by the xenon tube used in the strobe device is fixed as a reference value, and the balance and gain of the color components detected based on this reference value are adjusted. Therefore, when photographing a subject irradiated with light sources having different color temperatures, such as sunlight, fluorescent lamps or light bulbs, or when a plurality of types of light sources are mixed, the detection of the color temperature and WB (White (Balance) adjustment is not performed properly, and color reproducibility is degraded.

  In addition, a mobile phone equipped with a small electronic camera is equipped with a flash light emitting device using a white LED. For example, red (R), green (G), and blue (B) LEDs are used. In the case of a white LED configured by additive color mixing, there is a problem that subtle variations in color tone occur because the characteristics of each color LED have variations.

  Furthermore, in the case of a white LED configured by combining a blue (B) LED and a yellow (Y) phosphor material, or a white LED configured by combining an ultraviolet LED and an RGB phosphor material. However, although it is apparently white light, there is a problem that the light emission intensity in a specific wavelength band is small and the color reproducibility of the photographed image is lowered.

  The present invention has been made in view of the above points, and an object thereof is to provide an electronic camera capable of improving color reproducibility.

In order to solve the above problems, an electronic camera according to the invention of claim 1 is provided:
A light emitting unit capable of changing a color component of emitted light;
An acquisition means for acquiring a color component included in light source light that irradiates the subject or reflected light from the subject;
Determining means for determining a color component of light to be emitted based on the color component calculated by the acquiring means;
And a light emission control means for causing the light emitting section to emit light of the color component determined by the determination means in response to a photographing instruction.

According to a second aspect of the present invention, in the electronic camera according to the second aspect of the invention, the light emitting unit includes a plurality of light emitting members that emit light of different color components, and emits light by changing the combination of the light emitting members that emit light simultaneously. The color component of
The light emission control unit selects one or a plurality of light emitting members to emit light so that the color component determined by the determination unit is obtained.

  An electronic camera according to a third aspect of the invention is characterized in that the color component is a color component represented by an RGB component, chromaticity, color temperature, or spectral distribution characteristic.

An electronic camera according to a fourth aspect of the invention includes a calculation unit that calculates a color correction amount that corrects a white balance of the color component based on the color component acquired by the acquisition unit,
The determining means determines a color component corresponding to the color correction amount calculated by the calculating means as the color component to be emitted.

The electronic camera according to the invention described in claim 5 is a calculation unit that calculates a correction amount of a color that corrects a white balance of the color component based on the color component acquired by the acquisition unit;
Adjusting means for adjusting the white balance by controlling the component ratio or gain of the color signal input with the color correction amount calculated by the calculating means;
The determining unit determines a color component corresponding to the color component acquired by the acquiring unit as a color component to be emitted.

An electronic camera according to a sixth aspect of the invention includes an imaging unit that captures an image of a subject in response to an imaging instruction;
A photographing control means for controlling a light emitting operation of the light emitting unit and a photographing operation of the imaging unit;
The imaging control means controls to sequentially switch the combination of the light emitting members in the light emitting unit to emit light according to one imaging instruction, and a plurality of images having different color components of light emitted from the light emitting unit. The image pickup unit is controlled so as to continuously shoot.

  An electronic camera according to a seventh aspect of the invention is characterized in that the light emitting member of the light emitting portion is a light emitting diode.

  According to an eighth aspect of the present invention, there is provided an electronic camera that emits white flash light by additively mixing color components of a plurality of light emitting diodes.

  According to the present invention, the light emitting unit capable of changing the color component of the emitted light, the obtaining unit for obtaining the color component included in the light source light that irradiates the subject or the reflected light from the subject, and the measurement unit Determining means for determining the color component of the light to be emitted based on the acquired color component; and emission control means for causing the light emitting unit to emit the light of the color component determined by the determining means in accordance with the photographing instruction. Therefore, it is possible to correct the emission color, color temperature, or spectral distribution characteristic of the emitted flash light, or a combination thereof according to the shooting situation, and thereby, a captured image having a desired color temperature or spectral distribution characteristic. In addition, it is possible to acquire a captured image in which a rendering effect by a desired color illumination is expressed.

  Further, the light emitting unit is composed of a plurality of light emitting members that each emit light of different color components, and changes the color component of the emitted color by changing the combination of the light emitting members that emit light at the same time. Since one or a plurality of light emitting members are selected to emit light so as to have the color component determined by the determining means, a captured image having a desired color temperature or spectral distribution characteristic is obtained by performing continuous shooting for correcting the emission color. In addition, it is possible to improve the acquisition probability of a photographed image in which a rendering effect by a desired color illumination is expressed, thereby preventing re-shooting, improving the photographing efficiency and reducing the burden on the photographer. I can plan.

  Furthermore, since the color component represented by the RGB component, chromaticity, color temperature, or spectral distribution characteristic can be varied, it is possible to alleviate the bias of the spectral distribution characteristic of the light-emitting diode, thereby reproducing the color in the captured image. It is possible to improve the performance.

The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.
An electronic camera according to the present invention will be described with reference to FIGS.
First, the configuration of the electronic camera 1 in the present embodiment will be described.
As shown in FIG. 1, the electronic camera 1 according to the present embodiment includes a housing 2 molded in a substantially rectangular shape. On the top surface of the housing 2, as shown in FIGS. 1 to 4. A power button 3, a mode switching unit 4, and a shutter button 5 are provided.

  The power button 3 is constituted by a pushable button switch, and the power is switched on or off by a push operation.

  The mode switching unit 4 is configured by a slide switch that is movable in a certain direction, and is switched to a photographing mode, a reproduction mode, and a setting mode by a sliding operation. In addition, the shooting mode includes a normal shooting mode and a bracket shooting mode, and the setting mode includes a normal setting mode and a bracket setting mode.

  The shutter button 5 is composed of a button switch that can be freely pressed, and in the shooting mode, the shutter button 5 is instructed to release by a pressing operation. In the reproduction mode or the setting mode, execution of commands on various guidance screens or selection screens is instructed by a push operation. The electric signal input by the shutter button 5 is output to an input circuit 6 provided inside the housing 2 as shown in FIG.

On the other hand, as shown in FIGS. 3 and 5, the lower surface of the housing 2 is provided with a plate-like lid portion 7 that can be freely opened and closed, and a communication portion 8.
Two storage portions 9 and 10 are provided inside the lid portion 7 and inside the housing 2. The storage units 9 and 10 are hollow inside, and a battery 11 as a power source and a recording medium 12 such as a memory card are detachably attached to the dedicated storage units 9 and 10, respectively. ing.

Among these, as shown in FIG. 5, the battery storage unit 9 is connected to a power supply control unit 13 provided inside the housing 2, and current is output from the stored battery 11.
The recording medium storage unit 10 is provided with a recording medium I / F 14, and image data and the like are transmitted to and received from the recording medium 12 via the recording medium I / F 14.

  The communication unit 8 includes an input / output I / F 15 and a communication I / F 16 such as a USB or a LAN, and an external device connected to the communication I / F 16 via the input / output I / F 15. Image data and the like are transmitted and received between the two.

Further, as shown in FIG. 3, a first display unit 17, an optical finder 18, a guidance display button 19, an operation button 20, and a screen display button 21 are disposed on the rear surface of the housing 2. Yes.
The first display unit 17 is configured by an LCD (Liquid Crystal Display) or the like, and displays various information such as a subject, shooting information such as shooting conditions or setting information as an electronic viewfinder in the shooting mode, and in the playback mode. Various guidance screens or instruction screens or selected images are displayed. The first display unit 17 also has a function as a touch panel that gives various input instructions by touch input with a finger or an input pen.

  As shown in FIG. 5, the optical viewfinder 18 includes a second display unit 22, a viewfinder mirror 23, and a viewfinder lens 24. The optical viewfinder 18 composes an image to be captured on the second display unit 22, a focal length, and the like. These images are displayed, and these images and the like are reversed by the finder mirror 23 so as to be viewed through the finder lens 24.

  The guidance display button 19 is configured by a pushable button switch, and various guidance screens can be selected by a pushing operation.

  The operation button 20 is constituted by a cross key that can be pushed in the cross direction, and can select a command on various guidance screens or instruction screens by a push operation.

  The screen display button 21 is configured by a pushable button switch, and whether or not various types of information are displayed on the first display unit by the push operation, how much information is displayed, A selection is made as to whether or not to display the through image itself.

Further, as shown in FIGS. 1 and 4, an imaging unit 25 and a flash light emitting device 26 are disposed on the front surface of the housing 2.
As shown in FIG. 6, the imaging unit 25 includes a lens unit 27, a mirror surface unit 28, a shutter 29, and an imaging device 30. The lens unit 27, the mirror unit 28, the shutter 29, and the image sensor 30 are arranged in this order along the beam axis.

  The lens unit 27 includes an imaging lens 31 that is an optical system and a measurement lens 32 that is a single lens. Among these, as shown in FIG. 6, the imaging lens 31 is composed of six spherical lenses including two doublets in which a convex lens and a concave lens are bonded together. Further, the predetermined lens in the imaging lens 31 is provided with a lens driving unit 33 for adjusting the position of the lens along the light beam axis direction so that the focal length can be adjusted. . Further, in such an imaging lens 31, a diaphragm mechanism 34 is disposed between predetermined lenses, and an openable / closable diaphragm ring (not shown) formed in a petal shape is connected to an interlocking ring (not shown). The amount of light incident on the inside of the housing 2 is adjusted by opening and closing accompanying the operation.

  On the other hand, the measurement lens 32 is configured to cause a light beam to enter the detection unit 35 provided inside the housing 2 and on the back side of the measurement lens 32. The detection unit 35 detects the light flux amount and the light flux intensity based on the incident light flux.

The mirror surface portion 28 includes a main mirror 36 whose surface is mirror-finished and a sub mirror 37.
Of these, the main mirror 36 is provided so as to intersect with the light beam axis at a predetermined angle. Simultaneously with the pressing operation of the shutter button 5, the main mirror 36 rotates upward with one end on the back side of the main mirror 36 as the center. It comes to move. In addition, a part of the main mirror 36 is provided with a semi-transmissive portion, and most of the light beam incident on the main mirror 36 via the imaging lens 31 is reflected by the main mirror 36 and is transmitted to the second display unit. The light beam incident on this semi-transmissive portion is transmitted to the surface opposite to the incident surface and is emitted to the sub mirror 37.

  A light beam that has passed through the main mirror 36 is incident on the sub-mirror 37 and is incident on the detection unit 35 described above.

  The shutter 29 is an electronic shutter whose opening / closing operation, traveling speed, and the like are controlled based on an electrical signal. When the amount of light incident through the lens unit 27 is insufficient, a driving mechanism (not shown) is provided. Z) adjusts the opening / closing time of the shutter 29, that is, the time during which the light beam enters the image sensor 30 by controlling the traveling speed.

  Note that the shutter 29 can be opened and closed either vertically or horizontally, or horizontally. The shutter in the present embodiment is an electronic shutter, but is not limited to this, and may be a mechanical shutter that is mechanically controlled.

  The image sensor 30 is composed of an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). The image sensor 30 converts the light flux of the image of the subject incident through the imaging lens 31 of the lens unit 27 into an electric signal. Is converted to output.

Further, the flash light emitting device 26 includes a light emitting unit 38 and a light emission driving unit 39 as shown in FIG.
The light emitting section 38 is composed of a plurality of light emitting members 40. For these light emitting members 40, for example, flash discharge tubes such as xenon tubes are used and arranged along the longitudinal direction.

  In addition, the light emission part 38 is not limited to the structure by which the several light emitting member 40 is arranged, The structure which divided the one light emitting member 40 into the some division may be sufficient.

As shown in FIG. 7, the light emission drive unit 39 includes a boost charging circuit 41, a plurality of trigger coils 42, a plurality of main capacitors 43, a plurality of trigger switches 44, and a plurality of light emission stop switching elements 45. Has been.
Among these, the boosting charging circuit 41 boosts the battery voltage of 3.0 to 4.2 V to about 330 V and outputs it to the main capacitor 43.
The trigger coil 42 includes a trigger capacitor 46, a trigger resistor 47, and a coil 48, and the electric charge charged in the trigger capacitor 46 simultaneously with the main capacitor 43 is discharged through the primary side of the coil 48. On the secondary side, a trigger voltage of about 3300V is generated.
The main capacitor 43 is charged with the voltage output from the boost charging circuit 41.
The trigger switch 44 is formed of a thyristor, a power FET (Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), or the like having high withstand voltage and high speed characteristics. These light emission stop switching elements 45 operate according to a trigger signal.
The light emission stop switching element 45 is composed of a high breakdown voltage switching element and outputs a light emission stop signal to the trigger coil 42.

  In the light emission drive unit 39 configured as described above, one trigger coil 42, a main capacitor 43, a trigger switch 44, and a light emission stop switching element 45 are connected to each light emitting member 40. Accordingly, the light emitting member 40, the trigger coil 42, the main capacitor 43, the trigger switch 44, and the light emission stop switching element 45 constitute one set.

On the other hand, an imaging control unit 49 is provided inside the housing 2, and the imaging control unit 49 includes an operation control unit 50, a measurement unit 51, an input image processing unit 52, and a light emission control unit 53. It is composed of
The operation control unit 50 controls the focal length by controlling a predetermined lens in the imaging lens 31 based on the output electrical signal. Further, by controlling the interlocking ring in the diaphragm mechanism 34 and the drive mechanism in the shutter 29, the spherical aberration of the lens and the traveling speed of the shutter 29 are controlled.

  The measurement unit 51 calculates a photometric value, a distance measurement value, and a color temperature based on the light flux amount and the light flux intensity detected by the detection unit 35, and an achromatic portion in the imaging screen is extracted. Yes.

  As shown in FIG. 8, the input image processing unit 52 includes a CDS (Correlated Double Sampling) / AGC (Automatic Gain Control) circuit 54, an A / D conversion circuit 55, a color separation circuit 56, and a WB control circuit 57. The image signal processing circuit 58 and a color information memory 59 are included.

  Among these, the CDS / AGC circuit 54 removes noise in the electrical signal output from the image sensor 30 and sets an appropriate gain when the voltage output from the image sensor 30 is small due to insufficient exposure time. The amplified signal is output to the subsequent A / D conversion circuit 55.

  The A / D conversion circuit 55 converts the input analog image data into digital image data and outputs it to the color separation circuit 56.

The color separation circuit 56 uses the color signal difference in the input image data to separate the color components of R, G, and B, and outputs the separated color signal to the subsequent image signal processing circuit 58. .
The output color signal is adjusted by the WB control circuit 57 so that the balance of the R, G, and B color components becomes equal. Alternatively, an integral value obtained by integrating the achromatic color portion in the imaging screen extracted by the measurement unit 51 and an average value of (R−Y) and (B−Y) that are the difference between the color component and the luminance component are: Each is adjusted to zero. Alternatively, when the color temperature calculated by the measuring unit 51 is high, the gain of the R component is increased to decrease the gain of the B component, and when the color temperature is low, the gain of the B component is increased. Is adjusted so as to decrease the gain of the R component.

  The image signal processing circuit 58 receives the color signal after gain adjustment as described above, performs various processing on the color signal, and outputs it to the control unit 60 described later.

The light emission control unit 53 controls the light emission amount, the light emission time, the number of times of light emission, the light emission interval or the light emission position of the light emitting unit 38 based on the color signal component ratio and the color temperature information calculated by the measurement unit 51, The color tone, color temperature, or spectral distribution characteristic of the emission color is adjusted.
Note that the light emission control unit 53 may be configured to control the light emission amount and the light emission time based on the dimming photometric value in the preliminary light emission or the main light emission.

  The above-described photographing control unit 49 is connected to a control unit 60 composed of a CPU (Central Processing Unit). For example, an input for calculating a necessary exposure amount from a photometric value or the like according to photographing conditions set by the photographer is input. Data is calculated and processed.

Further, the WB control circuit 57 in the input image processing unit 52 is controlled based on the WB setting information set in accordance with the photographer's operation, and the chromaticity recorded in the color information memory 59 in the input image processing unit 52. The coordinates and the color temperature are displayed on the first display unit 17 and the second display unit 22 together with the captured image.
Such a control unit 60 is connected to a storage unit 61, an image processing unit 62, a compression processing unit 63, and display control units 64 and 65 disposed inside the housing 2.

  The storage unit 61 includes a volatile RAM (Random Access Memory) that temporarily stores information and a rewritable nonvolatile ROM (Read Only Memory).

  Various system programs, application programs, and data are stored in the ROM. On the other hand, in the RAM, a program area for expanding a program, a data area for storing data input from the operation buttons 20 or various processing results by the control unit 60, and the like are formed. .

  The image processing unit 62 performs various types of image processing such as pixel interpolation processing or γ correction processing on the electrical signal of the image data output from the image sensor 30 and outputs the result as digital image data. Yes.

  The compression processing unit 63 compresses and encodes or decompresses image data using a compression method such as JPEG (Joint Photographic Expert Group), MPEG4 (Moving Picture Expert Group 4), or TIFF (Tagged Image File Format). It has become.

  The display control units 64 and 65 are divided into a first display control unit 64 and a second display control unit 65, and each display control unit 64 and 65 is based on a display signal from the control unit 60. The image data output from is converted into a video signal and output to the first display unit 17 and the second display unit 22, respectively. Among these, the first display unit 17 is provided with a display memory 66, and digital image data is temporarily stored therein.

Next, the operation of the electronic camera 1 in this embodiment will be described.
First, as a preparation, after switching to “setting mode” by sliding the mode switching unit 4, for example, select one of “forced flash”, “flash prohibited”, or “auto flash” as the flash condition. Various shooting conditions are set.

  When it is determined that the voltage of the main capacitor 43 in the light emission drive unit 39 is insufficient to emit the flash light, the voltage boosting circuit 41 of the light emission drive unit 39 in the flash light emitting device 26 performs about 3. The battery voltage of 0 to 4.2 V is boosted to about 330 V, and the boosted voltage is charged in the main capacitor 43.

  Next, by sliding the mode switching unit 4 to switch to the “shooting mode”, the housing 2 is moved based on the through images displayed on the first display unit 17 and the second display unit 22. , Let the perspective be adjusted. Then, at the moment when a desired image is displayed on the optical viewfinder 18 or the first display unit 17, the photographer presses the shutter button 5, so that the image data captured by the imaging unit 25 is converted into the input image. The data is output to the first display unit 17 via the processing unit 52, the control unit 60, and the like, and is stored in the built-in storage unit 61 or the attached removable recording medium 12 to complete a series of photographing operations. .

At this time, details of the operation method will be described with reference to FIGS. 9 to 12 for strobe shooting in which the flash color is automatically set based on the WB setting information or the color temperature information.
First, as shown in FIG. 9, photographing conditions such as exposure conditions are set (step S1), and photometric processing is performed (step S2). Based on the color temperature information of the subject reflected light and the light source light, the WB control circuit 57 performs WB control processing (step S3). Further, after zoom processing, AF (Auto Focus) processing, and the like are sequentially performed (step S4), a through image of the subject is displayed on the first display unit 17 together with shooting information such as shooting conditions and setting information ( Step S5).

At this time, as shown in FIG. 10, the first display unit 17 displays the chromaticity coordinate value of the light source, the correlated color temperature converted into the Kelvin unit (K) or the mired unit (mrd), or the color as the WB setting value. A representative value such as the LB index of the conversion filter is displayed. Alternatively, when the screen display button 21 is pushed, as shown in FIG. 11, a bar graph or a line graph indicating the spectrophotometric characteristics of the light source, or a chromaticity diagram such as an xy chromaticity diagram is displayed on the through image. Overlaid. Alternatively, as shown in FIG. 12, chromaticity coordinates or color temperature scales or pointers are displayed on the black body radiation locus in the chromaticity diagram.
Note that there are various spectrum distributions of light included in light source light or reflected light from a subject. As a method of expressing color components included in these light, spectral distribution characteristics indicating light quantity for each frequency, RGB tristimulus An RGB component indicating the component amount of the value, a chromaticity that is a color component with normalized brightness, a color temperature that indicates a color component based on black body radiation, and the like.

  After confirming these display information, when the setting of the strobe angle bracketing is turned on (step S6), based on the set WB and the color temperature information of the light source, the light emission position, the irradiation angle, the color tone and the light emission in the light emitting unit 38. The number of light emission of the light emitting member 40 to be selected is selected and set (step S7).

  Thereafter, the state of charge of the main capacitor 43 of the light emission drive unit 39 in the flash light emitting device 26 is confirmed (step S8). If the state of charge of the main capacitor 43 is incomplete (step S8; NO), the method described above. Thus, the charging process of the main capacitor 43 is performed (step S9).

  After confirming that the charging state of the main capacitor 43 is complete (step S8; YES), the shutter button 5 is pushed (step S10). At this time, after the shutter button 5 is pressed, pre-light emission is performed by a part of the light emitting unit 38 in the flash light emitting device 26 by the automatic light control function (step S11), and the reflected light from the subject is received. Then, a photometric process for light control is executed (step S12).

  Further, the light emission amount or the exposure condition is adjusted based on the set photographing condition and the photometric value at the time of pre-emission, or the GN or the aperture value is adjusted so as to satisfy the following expressions (1) and (2), respectively. (Step S13).

……（１）
ここで、Ｆは絞り値、Ｌは撮影距離、ＳはＩＳＯ感度である。

...... (1)
Here, F is an aperture value, L is a shooting distance, and S is ISO sensitivity.

……（２）
ここで、Ｆは絞り値、Ｌは撮影距離、ＳはＩＳＯ感度である。

(2)
Here, F is an aperture value, L is a shooting distance, and S is ISO sensitivity.

  Then, the selected light emitting member 40 emits light according to the light emission condition and the set light amount based on the photographing condition and the photometric value, and photographing is performed (step S14). Finally, the photographed image is compression-encoded in the compression processing unit 63 and recorded in the storage unit 61 of the electronic camera or the recording medium 12 attached together with the exposure conditions, the light emission position, and the irradiation angle (step S15). A series of flash photography is completed.

In addition, when performing continuous shooting (hereinafter, strobe emission color bracketing shooting) for correcting the emission color or spectral characteristics of the light emitting unit 38, it is necessary to set various conditions before the shooting operation. Therefore, with reference to FIGS. 13 to 18, the details of the setting method and operation method of shooting conditions (hereinafter referred to as bracket conditions) during strobe emission color bracketing shooting will be described.
First, as shown in FIG. 13, on the mode selection screen, the mode switching unit 4 is slid (step S <b> 21) to switch to “setting mode” (step S <b> 22), and then “bracket setting mode”. (Step S23; YES), the correction interval, the correction order, the shooting order, or the number of shots is set (step S24).

  The correction interval is set with respect to the correction width (ΔS or Δθ) of the position S of the light emitting member 40 that emits light in the light emitting unit 38 and the irradiation angle θ of the light emitting member 40 for each photographing. Can be done.

  The correction order or shooting order is ascending order (+ direction, right to left direction with respect to the subject), descending order (-direction, direction from left to right with respect to the subject), and "0 +-" order (center to left) ... → right ...) or "0- +" order (center-> right ...-> left ...) and the like can be selected and set.

For example, assuming that “0” is an initial shooting condition with no correction, when the number of shots is set to “3” in the above ascending order, (−1 correction) → (0: no correction) → Continuous shooting is performed under the conditions of the light emission position and the irradiation angle corrected in the order of (+1 correction).
In the case of continuous shooting in which the light emission position is corrected, as shown in the following equation (3), if the initial light emission position is “S #”, (S # −ΔS #) → (S #) → (S # + ΔS #). ) Will be taken in order.

S # = S # ₀ −k × ΔS # (3)
Here, k is an arbitrary integer.

  Therefore, in the actual setting scene, if the shooting order is set to “ascending order”, the number of shots is set to “3”, the initial position is set to “center”, and the correction interval is set to “ΔS # = 1” (one right ) → (center) → (one left), continuous shooting is performed.

  Also, in the above bracket conditions, when only the number of shots is changed to “5”, (−2 correction) → (−1 correction) → (0: no correction) → (+1 correction) → Photographing is performed in the order of (+2 correction), that is, (S # −2ΔS #) → (S # −ΔS #) → (S #) → (S # + ΔS #) → (S # + 2ΔS #).

Further, in this bracket condition, when the shooting order setting is changed to “descending order”, (+2 correction) → (+1 correction) → (0: no correction) → (−1 correction) → (−2 correction) That is, photographing is performed in the order of (S # + 2ΔS #) → (S # + ΔS #) → (S #) → (S # −ΔS #) → (S # −2ΔS #).
In this case, unlike the above ascending order, continuous shooting is performed based on the following formula (4).

S # = S # ₀ + k × ΔS # (4)
Here, k is an arbitrary integer.

Further, in the above bracket conditions, when only the shooting order is set to “0 + −”, (0: no correction) → (+1 correction) → (+2 correction) → (−1 correction) → (− (2 correction), that is, after the first image is shot without correction, the shooting is sequentially performed based on the above formula (3), and then the sequential shooting is performed based on the above formula (4). Done.
Note that the shooting order is not limited to the above-described shooting order, and shooting may be performed by changing the setting to another shooting order.

In the bracket condition setting method described above, the continuous shooting for correcting the light emission position has been described. However, the same applies to the continuous shooting for correcting the irradiation angle. For example, the shooting order is “ascending order” and the initial irradiation angle is “ When “θ” and the number of shots are set to “3”, continuous shooting is performed in the order of (θ ₀ −Δθ) → (θ ₀ ) → (θ ₀ + Δθ) as represented by the following equation (5). Is called.

θ = Δθ ₀ −k × Δθ (5)
Here, k is an arbitrary integer.

The number of shots can be set to an arbitrary number, but in order to correspond to the setting of the correction order described above, for example, odd numbers such as 1, 3, 5, 7,. = It is preferable to set in the format of (2k + 1), (2k-1).
Here, the number of shots and the number of times of light emission of the flash light emitting device 26 are the same.

  The bracket condition setting method may be a method of selecting a preset numerical value, a method of adjusting a preset numerical value, or a method of inputting an arbitrary numerical value. May be.

  The bracket condition is set by pressing the operation button 20, but a dedicated button for separately setting the bracket condition may be provided.

  When the setting of the bracket condition is completed, the mode selection screen is displayed again by return processing (step S21). Then, the mode switching unit 4 is slid to switch to “shooting mode” (step S26), and shooting conditions such as exposure conditions are set (step S27), photometric processing, WB processing, zoom processing, and AF (Auto Focus) processing and the like are sequentially executed (step S28). Thereafter, a through image of the subject is displayed on the first display unit 17 together with shooting information such as shooting conditions and setting information (step S29).

  After confirming the display information, when the setting of strobe emission color bracketing is turned on (step S30), the initial value in the light emitting unit 38 is set based on the set WB information (step 31). Then, the charging state of the main capacitor 43 of the light emission drive unit 39 in the flash light emitting device 26 is confirmed (step S32). At this time, if the charging state of the main capacitor 43 is incomplete (step S32; NO), the charging process of the main capacitor 43 is performed by the method described above (step S33).

  After confirming that the charged state of the main capacitor 43 is complete (step S32; YES), the shutter button 5 is pushed (step S34). Then, after the shutter button 5 is pushed by the automatic light control function, pre-light emission is performed in a part of the light emitting unit 38 in the flash light emitting device 26 (step S35), and the reflected light from the subject is received. The light metering process for light control is executed (step S36), and the bracket conditions set in the “bracket setting mode” are sequentially set in the light emission controller 53.

Here, in the case of continuous shooting for correcting the light emission position, a case where the correction interval is set to “ΔS”, the shooting order is set to “ascending order”, and the number of shots is set to “2k + 1” will be described as an example.
As shown in FIG. 14, first, the photographing order is confirmed (step S37), and it is recognized that the photographing order is ascending (step S38). Is set (step S39). Next, the shooting order m is recognized as +1 (step S40), and the number of shots n is set to 2k + 1 and the number of shots j is set to 0 (step S41).

If it is recognized that the shooting order is the descending order (step S42), after the initial value of the number S # of the light emitting member 40 is set (step S43), the shooting order m is recognized as -1. (Step S44).
Further, the number of shots j taken at this time is set as j = 0 regardless of the shooting order because shooting has not yet been performed.

  After all the bracket conditions are set, the light emission position or the irradiation angle is corrected (step S45). In this light emission position or irradiation angle correction process, as shown in FIG. 16, the number S # of the light emitting member 40 is set based on the following equation (6) (step S46).

      S # = S # + m × j × ΔS # (6)

  Thereafter, the state of charge of the main capacitor 43 of the light emitting member 40 to be lit is confirmed (step S47). If it is determined that the state of charge of the main capacitor 43 is incomplete (step S47; NO), the charging process is performed. Performed (step S48).

  In the case of continuous shooting for correcting the irradiation angle, after the irradiation angle θ is set based on the following formula (7) (step S46), the charged state of the main capacitor 43 of the light emitting member 40 that emits light is confirmed. (Step S47).

      θ = θ + m × j × Δθ (7)

  After confirming that the charged state of the main capacitor 43 is complete (step S47; YES), the number of the light emitting member 40 to be lit is set (step S49), the set photographing condition and the photometric value at the time of pre-flash. The light emission amount or the exposure condition is adjusted based on the above, or the GN or the aperture value is adjusted so as to satisfy the following expressions (8) and (9) (step S50).

……（８）
ここで、Ｆは絞り値、Ｌは撮影距離、ＳはＩＳＯ感度である。

...... (8)
Here, F is an aperture value, L is a shooting distance, and S is ISO sensitivity.

……（９）
ここで、Ｆは絞り値、Ｌは撮影距離、ＳはＩＳＯ感度である。

...... (9)
Here, F is an aperture value, L is a shooting distance, and S is ISO sensitivity.

  Then, after the exposure value is set based on the exposure condition and the photometric value (step S51), as shown in FIG. 17, the trigger switch 44 is actuated by the trigger signal output from the light emission control unit 53, and the light emission unit The trigger coil 42 of each flash discharge tube 40 at 38 is activated.

  Further, the electric charge charged in the trigger capacitor 46 of the trigger coil 42 is discharged through the primary side of the coil 48, and a trigger voltage of about 3300 V is generated on the secondary side and applied to the flash discharge tube 40 of the light emitting unit 38. Is done. As a result, arc discharge is generated inside the flash discharge tube 40, flash is emitted (step S52), and the photographed image is recorded in the RAM of the storage unit 61 as image data (step S53). Note that light emission due to discharge is automatically stopped by a light emission stop signal output from the light emission stop switching element 45.

  When the image data recorded in the RAM of the storage unit 61 is output and transferred to the ROM (step S54), the value of the photographed number j is incremented by one and recognized as “j = j + 1” (step S55). Then, it is confirmed whether or not the condition shown in the following equation (10), that is, whether or not the number of shot images j is equal to or greater than the number of shots n is satisfied (step S56). At this time, since only one image has been taken, the above-described photographing process is repeatedly performed (step S56; NO), whereby the light emitting members 40 that emit light are sequentially switched, as shown in FIG. The flash emission color bracketing shooting is performed.

      j ≧ n (10)

  Then, after the number of shots j satisfies the above-described conditions (step S56; YES), the compression processing unit 63 performs compression encoding, and finally, in the electronic camera together with the exposure conditions, the light emission position, and the irradiation angle. It is recorded in the storage unit 61 or the attached recording medium 12 (step S57), a series of flash emission color bracketing photographing is completed, and the mode selection screen is displayed again by return processing (step S21).

  As described above, according to the electronic camera 1 of the present invention, the light emitting unit 38 that can change the color component of the emitted light, and the color component included in the light source light that irradiates the subject or the reflected light from the subject. The measurement unit 51 to be acquired, the input image processing unit 52 that determines the color component of the light to be emitted based on the color component calculated by the measurement unit, and the color component determined by the determination unit according to the shooting instruction Since the light emission drive unit 39 that causes the light emission unit to emit light is provided, it is possible to correct the emission color, color temperature, or spectral distribution characteristic of the emitted flash light according to the shooting situation, and thereby, a desired A photographed image having a color temperature or spectral distribution characteristic, or a photographed image expressing a rendering effect by a desired color illumination can be acquired.

  In addition, the light emitting unit 38 includes a plurality of light emitting members 40 that emit light of different color components, and changes the color component of the emitted light by changing the combination of the light emitting members 40 that emit light at the same time. Since the unit 39 selects one or a plurality of light emitting members 40 to emit light so that the color components determined by the input image processing unit 52 are obtained, a desired color temperature is obtained by performing continuous shooting for correcting the light emission color. Alternatively, it is possible to improve the acquisition probability of a photographic image having spectral distribution characteristics and a photographic image in which a desired color lighting effect is expressed, thereby preventing re-shooting and improving shooting efficiency. The burden on the photographer can be reduced.

When the shooting order is set to other than ascending order and descending order, for example, “0 + −” is set, as shown in FIG. 15, after the shooting order is determined (step S58), irradiation is performed in ascending order. The initial value of the angle θ or the light emission position S # and the shooting order m are sequentially set (steps S59 and S60), the shot number n is set to k + 1, and the shot number j is set to 0 (step S61).
Then, the strobe angle bracketing process is performed based on the set condition (step S62), and when the image data is output and transferred to the ROM (step S63), the value of the number of shots j is incremented by one, and “j = j + 1 "(step S64). Thereafter, it is confirmed whether or not the number of shots j satisfies the condition that the number of shots n or more is satisfied (step S65).
After confirming that the above condition is satisfied, the initial value of the irradiation angle θ or the light emission position S # and the photographing order m are sequentially set as in the ascending order (steps S66 and 67). At this time, since the number of shots n and the number of shots j have already been shot for one uncorrected image, the number of shots n is set to k and the number of shots j is set to 1 (step S68).
Then, strobe angle bracketing processing is performed based on the set conditions (step S69), and the same processing as that in the above-described ascending order is repeated (steps S70, 71, 72), and subsequent processing is executed (step S70). Step S57).

[First Modification]
In the present embodiment, a so-called external photometry method is adopted in which a separate detection unit 35 is provided outside the image sensor 30 to detect color temperature information. However, the present invention is not limited to this and is shown in FIG. As described above, a configuration employing a so-called internal photometry method in which color temperature information is detected from a difference in color signals after separation by the color separation circuit 56 may be employed.

  Further, as compared with the external photometry method in this embodiment and the internal photometry method as shown in FIG. 19, as shown in FIG. 20, the spectrophotometer capable of accurately measuring the color temperature of light emitted from the light source. The structure provided with the measurement part 70 may be sufficient.

In the case of the configuration including the spectrophotometric measurement unit 70, in addition to the spectrophotometric measurement unit 70, the configuration includes a slit 71, a diffraction grating 72, and an optical dispersion unit 73.
The slit 71 is a plate-like member in which a minute gap is formed, and subject reflected light or light source light is incident on the formed gap.

  The diffraction grating 72 is configured to disperse subject reflected light or light source light incident through the slit 71 for each of a number of fine wavelength bands.

  The optical dispersion unit 73 is composed of a photodiode array, a line-type photosensor, or the like, and is formed so that a plurality of light receiving elements are integrated with a semiconductor substrate. The optical spectroscopic unit 73 thus formed is configured to simultaneously detect the amount of light energy split into a number of wavelength bands as a spectrum.

  The spectrophotometric measurement unit 70 includes an A / D conversion circuit 74, an energy distribution table memory 75, a color matching function data memory 76, a stimulus value calculation unit 77, a chromaticity coordinate calculation unit 78, and a color temperature calculation unit 79. It consists of.

  The A / D conversion circuit 74 converts the specific energy amount for each wavelength detected by the optical dispersion unit 73 into a digital value and outputs the digital value to the energy distribution table memory 75.

The energy distribution table memory 75 records the specific energy amount for each wavelength digitized by the A / D conversion circuit 74 as spectral energy distribution table data L (λ).
Here, an example of the spectral energy distribution table data L (λ) is shown in Table 1 below.

The color matching function data memory 76 stores r (λ), g (λ), b (λ), or x (λ), y (λ), z () at a corresponding wavelength based on the visual spectral ratio visual sensitivity characteristic. Color matching function data such as λ) is recorded.
Here, examples of color matching function data of the RGB color system and the XYZ color system are shown in Tables 2 and 3 below, respectively.

  The stimulus value calculation unit 77 applies the above-described color matching to the energy spectral energy distribution table data L (λ) recorded in the energy distribution table memory 75 as shown in the following formulas (11), (12), and (13). Tristimulus values such as RGB or XYZ are calculated by multiplying function data and totalizing and adding over the entire wavelength range, for example, in the visible light range.

……（１１）

...... (11)

……（１２）

(12)

……（１３）

(13)

  Based on the tristimulus values such as RGB or XYZ calculated by the stimulus value calculation unit 77, the chromaticity coordinate calculation unit 78, as shown in the following equations (14), (15), (16), (r, It is converted into chromaticity coordinates such as g, b) or (x, y, z).

      r = R / (R + G + B) (14)

      g = G / (R + G + B) (15)

      b = B / (R + G + B) (16)

  Note that the conversion formula to chromaticity coordinates is not limited to the above formulas (14), (15), and (16), and may be the following formula (17), for example.

      b = 1- (r + g) (17)

  The color temperature calculation unit 79 calculates the correlated color temperature based on the chromaticity coordinates calculated by the chromaticity coordinate calculation unit 78 or a conversion table table in which the chromaticity coordinates and the color temperature are combined. It has become.

Next, the details of the WB control method by spectrophotometric measurement will be described with reference to FIG.
First, as shown in FIG. 21, a color matching function is set (step S101), and photometric processing is performed (step S102).

  Thereafter, the energy distribution is measured for each wavelength, and the energy distribution table L (λi) is created (step S103). Then, tristimulus values are calculated (step S104), and chromaticity coordinates are calculated based on these tristimulus values (step S105).

  Next, it is determined whether or not to perform coordinate conversion processing (step S106). When coordinate conversion processing is performed (step S106; YES), for example, RGB coordinates to xyz coordinates, XYZ coordinates to xyz coordinates, etc. Is converted to the color system or chromaticity coordinates (step S107). Then, based on the converted chromaticity coordinates, a deviation Δuv from the correlated color temperature Ta and the black body radiation locus is calculated (step S108). At this time, when the coordinate conversion process is not performed (step S106; NO), a deviation Δuv from the correlated color temperature Ta and the black body radiation locus is calculated based on the chromaticity coordinates before the conversion process (step S106). S108).

  Further, it is confirmed whether or not the calculated deviation Δuv is equal to or smaller than the allowable value (step S109). If the calculated deviation Δuv is equal to or smaller than the allowable value (step S109; YES), the color temperature Ta or the chromaticity coordinates (x, y, z) and the like are displayed on the first display unit 17 and the second display unit 22 (step S110). At this time, if the deviation Δuv exceeds the allowable value (step S109; NO), error processing for color temperature measurement is performed (step S111).

  Finally, the WB is adjusted by the WB control circuit 57 of the input image processing unit 52 based on the calculated color temperature Ta or chromaticity coordinates (step S112). Further, the color temperature Ta, WB setting information, etc. Accordingly, the light emission position and other conditions in the light emitting unit 38 are set (step S113), and a series of WB control is completed.

  As described above, the electronic camera including the spectrophotometric measurement unit 70 is converted into chromaticity coordinates such as (r, g, b) or (x, y, z) using tristimulus values such as RGB or XYZ. Therefore, it is possible to calculate the correlated color temperature from the chromaticity coordinates or the conversion table table in which the chromaticity coordinates and the color temperature are combined, thereby performing precise WB control based on the color temperature. Can do.

  Note that the gain control method or WB control method of the color component of the imaging signal based on the color signal difference or component ratio, color temperature information, or the like is not limited to the present embodiment, and in black body radiation as shown in FIG. Each color of RGB corresponding to the color temperature calculated by the reciprocal of the relative intensity of each color signal of RGB as shown in FIG. 23 with reference to the characteristic data or conversion table of the color temperature and the relative intensity of each color signal of RGB, as shown in FIG. It may be performed based on the gain control amount of the signal.

  Further, the spectral distribution characteristic data L (λi) of the light source light described above is used as a standard light source, a desired spectral distribution such as a black body radiation spectral characteristic or a flat spectral distribution characteristic at a predetermined color temperature without using a color temperature. The color conversion filter characteristic F (λi) that can be converted into the characteristic LW (λi) is calculated by the following equation (18), and is performed based on the spectral distribution characteristic of the virtual filter F (λi). It may be.

……（１８）

...... (18)

  The spectral distribution characteristic of the black body radiation at the predetermined color temperature is calculated by the Planck black body radiation formula shown in the following formula (19).

……（１９）
ここで、ｈはPlank定数、ｃは光速、ｋはBoltzmann定数である。

...... (19)
Here, h is a Plank constant, c is the speed of light, and k is a Boltzmann constant.

  Further, the intensity of the peak wavelength of each characteristic or the radiant energy intensity of the light source at a predetermined color temperature such as 3200K or 5000K is set as a reference value, and the relative intensity with respect to this reference value is recorded in advance as a table or function. It may be calculated by referring to this.

[Second Modification]
In the present embodiment, the light emitting position or irradiation angle is changed by switching the light emitting members 40 in the light emitting unit 38 individually and sequentially, as shown in FIG. However, the present invention is not limited to this, and as shown in FIG. 25, the flash light bracket 40 may be photographed by sequentially switching a plurality of light emitting members 40.

  On the other hand, as shown in FIG. 26, strobe angle bracketing imaging may be performed by sequentially switching the number, position, and range of the light emitting members 40 that emit light in the light emitting unit 38.

  As described above, by releasing once, it is possible to perform correction correction of the amount of emitted light as well as the irradiation angle of the flash light emitting device 26, and thereby a desired amount of light and shadow can be obtained under a desired irradiation angle and shadow condition. It is possible to improve the probability of acquiring an image having the same.

[Third Modification]
Furthermore, in the present embodiment, lighting from the horizontal direction, that is, strobe angle bracketing shooting by side light is performed by switching the light emitting member 40 that emits light in the light emitting unit 38, but is not limited thereto. As shown in FIG. 27, the casing 2 may be rotated by 90 ° C., and illumination from above and below, that is, strobe angle bracketing photography using elevation light and depression light may be performed.

  Further, as shown in FIG. 28, the flash light emitting device 26 includes a plurality of light emitting members 40 arranged in a line along the circumferential direction so as to surround the imaging lens 31 on the front surface of the housing 2. May be.

Furthermore, as shown in FIG. 29, a plurality of light emitting members 40 in the light emitting unit 38 are previously installed in different directions and angles, and an arbitrary light emitting member is selected from the light emitting members 40 to obtain a desired irradiation angle. You may make it switch.
In this case, the installation angle of the light emitting member 40 in the light emitting unit 38 may be switched by being rotationally driven by a driving device (not shown) such as a motor.

[Fourth Modification]
Furthermore, in this embodiment, a xenon tube, which is a flash discharge tube, is used as the light emitting member 40 in the flash light emitting device 26. However, the present invention is not limited to this, and a white LED (Light Emitting Diode) may be used. However, in this case, since the circuit configuration of the light emission drive unit in the flash light emitting device 26 is different from the case where a xenon tube is used for the light emitting member 40, the details will be described with reference to FIGS. Other configurations are the same as those of the present embodiment, and thus description thereof is omitted.

  When the LED is used for the light emitting member 40 in the light emitting unit 38, the LED light emission driving unit 81 does not require the boosting charging circuit 41 and the trigger coil 42 as shown in FIG. 30, and a DC / DC converter, a charge pump, etc. The regulator 82 comprised by these, the limiting resistance 83, and the light emission control switch 84 are comprised. Further, the main capacitor 43 is not provided for each light emitting member 40, and one main capacitor 43 is provided for the light emission driving unit 39. The LED light emission drive unit 81 configured as described above can directly emit light from each light emitting member 40 without performing a charging operation by a voltage boosted to several to several tens of volts.

  As shown in FIG. 31, the LED light emission drive unit 81 may include a drive mechanism 85 configured by combining a regulator and a drive circuit. As shown in FIG. 32, the LED light emission drive unit 81 configured in this way emits pulsed light having a certain width.

  From the above, when a white LED is used for the light emitting member 40 in the flash light emitting device 26, it is not necessary to increase the voltage to several thousand volts, and sufficient light can be emitted by the voltage increased to several to dozens of volts. Since the main capacitor 43 is not required in the light emission drive unit, and the light emitting member 40 is caused to emit light directly by the voltage boosted by the regulator 82, the device configuration can be simplified, thereby reducing the size of the device. Can do.

Note that the light emitting member 40 is not limited to a white LED, and, for example, as illustrated in FIG. 33, the light emitting member 40 includes red (R), green (G), and blue (B) LEDs. There may be.
The flash light emitting device 26 configured in this way is used for strobe angle bracketing photography in which the relative light emission intensity of light emission color is appropriately adjusted or adjusted by additive color mixing of light emitted by each color LED, and correction by irradiation angle. Irradiation angle × light emission color bracketing shooting combined with correction by emission color can be performed.

Further, as shown in FIG. 34, in addition to the three colors of RGB, those composed of purple (P), yellow green (YG), yellow (Y), and orange (O) LEDs used for the above correction. It may be.
The flash light emitting device 26 configured in this manner can perform shooting by switching the emission color according to the emission position and the irradiation angle by additively mixing the light emitted by the LEDs of the respective colors. Further, similarly to the arrangement shown in FIG. 33, it is possible to perform strobe angle bracketing shooting and irradiation angle × light emission color bracketing shooting.

Furthermore, as shown in FIG. 35, it may be configured such that white, which is a basic color, always emits light, and LEDs that emit other colors can emit light sequentially.
The flash light emitting device 26 configured as described above is an LED having a light emitting color corresponding to a wavelength region weaker than white when the spectral distribution characteristic is unevenly distributed or when there is a wavelength region where the relative light emission intensity is small. By emitting the light, the spectral distribution characteristics can be flattened. Further, the color temperature and WB can be corrected.

  Also, a combination of a blue LED and a yellow phosphor material is used to achieve white light emission, or an ultraviolet LED and RGB (Red Green Blue) or OYGB (Orange Yellow Green Blue) fluorescence. Any configuration such as one configured to realize white light emission in combination with a body material may be used.

  However, in the flash light emitting device 26 configured by combining the blue LED and the yellow phosphor, the relative light emission intensity of the emitted flash light is small in the blue and green wavelength regions as shown in FIG. It is necessary to emit blue and green LEDs as shown in FIG.

  Further, in the flash light emitting device 26 configured by combining the purple LED and the three color phosphors of RGB, the relative light emission intensity of the emitted flash light is yellow green (YG), yellow, as shown in FIG. Since it is small in the wavelength range of (Y) and orange (O), it is necessary to emit yellow green, yellow and orange LEDs as shown in FIG.

  Furthermore, apart from the above example, for example, as shown in FIG. 39, the relative light emission intensity of the blue-green (BG) LED and the red (R) LED shown in FIG. As shown in FIG. 41, the spectral characteristics may be corrected by emitting light so that it becomes about half, that is, by adjusting the relative light emission intensity of each LED.

  As described above, since the color component represented by the RGB component, chromaticity, color temperature, or spectral distribution characteristic can be varied, the deviation of the spectral distribution characteristic of the light-emitting diode is alleviated, for example, the spectral characteristic curve in each spectrum diagram is flattened. Or approximate to the spectral distribution characteristics of sunlight, thereby improving the color reproducibility in the captured image.

  As shown in FIG. 42, the arrangement configuration when the LED is used for the light emitting member is not only three colors of RGB, but also purple (P), yellow green (YG), and yellow (Y ), Orange (O) LEDs may be arranged in a certain direction.

  Furthermore, as shown in FIG. 43, one set in which each color of RGB and white LEDs are arranged in a matrix may be arranged in a certain direction.

  Furthermore, as shown in FIGS. 44 to 46, the light emitting area of the white LED as a basic color is increased, and the light emitting area of the LED emitting other colors used for correction is reduced. Also good.

  As described above, since various emission colors are realized by the combination of the mixed colors, it is possible to change the emission color of the flash for each image during continuous shooting, thereby enabling the flash emission color bracketing shooting. It can be carried out.

[Fifth Modification]
Further, in the present embodiment and the fourth modification, a flash discharge tube or LED is used for the light emitting member 40 in the flash light emitting device 26, but is not limited to this, for example, a tungsten light bulb, a halogen light bulb, or a studio photograph. Light emitting elements other than flash discharge tubes such as light bulbs and LEDs, and lighting elements may be used. In this case, as shown in FIG. 47, the flash light emitting device 26 does not include the step-up charging circuit 41 and the trigger coil 42, and includes a regulator 91 including a DC / DC converter and a charge pump, a limiting resistor 92, and a light emission. A simple circuit configuration including the control switch 93 is obtained.

Here, a case where a halogen light bulb is used for the light emitting member 40 will be described as an example.
The relationship of the following formula (20) is established approximately between the rate of change (F / F ₀ ) of each characteristic of the halogen bulb and the rate of change of voltage (V / V ₀ ).

……（２０）
ここで、Ｋは各特性の固有値である。

...... (20)
Here, K is an eigenvalue of each characteristic.

For example, the relationship between the rate of change in temperature (T / T ₀ ) and the rate of change in voltage (V / V ₀ ) of the halogen bulb satisfies the following formula (21), and as shown in FIG. Increasing the voltage or current increases the relative emission intensity. Further, in the wavelength component and the spectral distribution characteristic, the light emission ratio in the short wavelength region is increased, the light emission ratio in the long wavelength region is decreased, and the color temperature T is increased. On the other hand, by reducing the drive voltage and current, the light emission ratio in the short wavelength region is decreased, the light emission ratio in the long wavelength region is increased, and the color temperature T is decreased.

……（２１）

(21)

From the above, when a light emitting element other than a flash discharge tube and an LED is used for the light emitting member 40, between the rate of change of each Fa (Fa / Fa ₀ ) and the rate of change of the voltage V (V / V ₀ ). Since the proportional relationship is established, it is possible to variably control the color temperature or color tone of the illumination light by controlling the drive voltage or current, and under the illumination conditions having the desired color temperature and spectral characteristics, The probability of acquiring an image having a desired expression effect can be improved.

[Sixth Modification]
Further, in the present embodiment, the flash light emitting device 26 according to the present invention is used in a form incorporated in the electronic camera 1, but the present invention is not limited to this, and as shown in FIG. The flash light emitting device 101 may be used, and the same effects as those of the present embodiment are achieved.

It is a perspective view which shows the electronic camera which concerns on this invention. It is a top view which shows the electronic camera which concerns on this invention. It is a rear view which shows the electronic camera which concerns on this invention. It is a front view which shows the electronic camera which concerns on this invention. It is a block diagram which shows the circuit structure of the electronic camera which concerns on this invention. It is an enlarged plan view showing a part of the electronic camera according to the present invention. It is a block diagram which shows the circuit structure of the flash light-emitting device which used the xenon tube for the light emission member. It is a block diagram which shows the circuit structure of an input image process part. It is a flowchart which shows the example of a process of flash photography based on WB setting information. It is a conceptual diagram which shows an example of the display information in a 1st display part. It is a conceptual diagram which shows the other example of the display information in a 1st display part. It is a conceptual diagram which shows the other example of the display information in a 1st display part. It is a flowchart which shows the example of a process of strobe color light bracketing imaging | photography. It is a flowchart which shows the example of a process of strobe color light bracketing imaging | photography. It is a flowchart which shows the example of a process of strobe color light bracketing imaging | photography. It is a flowchart which shows the process example of a strobe color light bracketing process. It is a timing chart which shows the drive mode of the flash light-emitting device which used the xenon tube for the light emission member. It is a conceptual diagram which shows the aspect of strobe light emission color bracketing imaging | photography. It is a block diagram which shows the structure of the electronic camera which employ | adopted the external measurement system. It is a block diagram which shows the structure of the electronic camera which provided the spectrophotometric measurement part. It is a flowchart which shows the process example of WB control by a spectrophotometric measurement. It is a graph which shows an example of the relationship between the color temperature in a flash discharge tube, and relative intensity. It is a conceptual diagram which shows an example of WB control by spectrophotometric measurement. It is a conceptual diagram which shows an example of the light emission pattern in a light emission part. It is a conceptual diagram which shows the other example of the light emission pattern in a light emission part. It is a conceptual diagram which shows the other example of the light emission pattern in a light emission part. It is a conceptual diagram which shows the aspect at the time of using an electronic camera rotated 90 degrees. It is a conceptual diagram which shows the usage example of the electronic camera which incorporates the flash light-emitting device which consists of another arrangement structure. It is the schematic which shows the other example of the arrangement configuration in a light emission part. It is a block diagram which shows an example of the circuit structure in the flash light-emitting device which used LED for the light emission member. It is a block diagram which shows the other example of the circuit structure in the flash light-emitting device which used LED for the light-emitting member. It is a timing chart which shows the drive mode of the flash light-emitting device which used LED for the light emitting member. It is a conceptual diagram which shows the light emission pattern of the light emission part comprised combining each color LED of RGB. It is a conceptual diagram which shows an example of the light emission pattern in the light emission part using LED. It is a conceptual diagram which shows the other example of the light emission pattern in the light emission part using LED. It is a spectrum figure which shows the relative light emission intensity distribution of the light light-emitted by the combination of blue LED and yellow fluorescent substance material. It is a spectrum figure which shows the relative light emission intensity distribution of the light light-emitted by each color LED. It is a spectrum figure which shows the relative light emission intensity distribution of the light light-emitted by the combination of ultraviolet light LED and each color LED of RGB. It is a conceptual diagram which shows the aspect of the light emission part at the time of making only white LED light-emit. It is a conceptual diagram which shows the aspect of the light emission part at the time of making blue-green and red LED light-emit simultaneously. It is a conceptual diagram which shows the aspect of the light emission part at the time of making white, blue green, and red LED light-emit simultaneously. It is the schematic which shows an example of the arrangement configuration in the light emission part using LED. It is the schematic which shows the other example of the arrangement configuration in the light emission part using LED. It is the schematic which shows the other example of the arrangement configuration in the light emission part using LED. It is the schematic which shows the other example of the arrangement configuration in the light emission part using LED. It is the schematic which shows the other example of the arrangement configuration in the light emission part using LED. It is a block diagram which shows an example of the circuit structure in the flash light-emitting device which used the white light bulb for the light-emitting member. It is a graph which shows the relationship between each characteristic in a halogen bulb, and a voltage. It is a perspective view which shows the aspect which externally attached the flash light-emitting device to the electronic camera.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100 Electronic camera 25 Image pick-up part 26,101 Flash light-emitting device 38 Light-emitting part 39 Light-emitting drive part 40 Light-emitting member 41 Boosting charge circuit 42 Trigger coil 43 Main capacitor 49 Imaging control part 51 Measuring part 52 Input image processing part

Claims (8)

A light emitting unit capable of changing a color component of emitted light;
An acquisition means for acquiring a color component included in light source light that irradiates the subject or reflected light from the subject;
Determining means for determining a color component of light to be emitted based on the color component acquired by the acquiring means;
An electronic camera comprising: a light emission control unit that causes the light emitting unit to emit light of the color component determined by the determination unit according to a photographing instruction. The light emitting unit is composed of a plurality of light emitting members that each emit light of different color components, and changes the color component of the emitted light by changing the combination of the light emitting members that emit light simultaneously,
The electronic camera according to claim 1, wherein the light emission control unit selects one or a plurality of light emitting members to emit light so that the color component determined by the determination unit is obtained.   The electronic camera according to claim 1, wherein the color component is a color component represented by an RGB component, a chromaticity, a color temperature, or a spectral distribution characteristic. Based on the color component acquired by the acquisition means, comprising a calculation means for calculating a correction amount of the color to correct the white balance of the color component;
The said determination means determines the color component corresponding to the correction amount of the color calculated by the said calculation means as said color component which should be light-emitted, The Claim 1 characterized by the above-mentioned. Electronic camera. Calculation means for calculating a correction amount of a color for correcting the white balance of the color component based on the color component acquired by the acquisition means;
Adjusting means for adjusting the white balance by controlling the component ratio or gain of the color signal input with the color correction amount calculated by the calculating means;
4. The electronic camera according to claim 1, wherein the determining unit determines a color component corresponding to the color component acquired by the acquiring unit as a color component to be emitted. 5. . An imaging unit that shoots a subject in accordance with a shooting instruction;
A photographing control means for controlling a light emitting operation of the light emitting unit and a photographing operation of the imaging unit;
The photographing control means controls to sequentially switch the combination of the light emitting members in the light emitting unit according to one photographing instruction so as to emit light, and a plurality of images having different color components of light emitted from the light emitting unit. The electronic camera according to claim 2, wherein the image pickup unit is controlled so that a continuous shooting is performed.   The electronic camera according to claim 1, wherein a light emitting member of the light emitting unit is a light emitting diode.   The electronic camera according to claim 7, wherein a white flash is emitted by additively mixing color components of a plurality of light emitting diodes.

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