JP2006243187A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera capable of easily taking a picture of high quality, and also, preventing an object from being in a backlight state. <P>SOLUTION: In the case a film sensitivity detection part 12 detects that the film sensitivity is ≥ISO 1600, and also, in the case the external light luminance detected by a photometry part 13 is equal to or exceeding the prescribed luminance by which the object is made in the backlight state, a control part 19 controls a strobe light emitting part 15 to emit strobe light. Further, in the case the film sensitivity detection part 12 detects that the film sensitivity is equal to or exceeding the prescribed sensitivity, but, in the case the external light luminance detected by the photometry part 13 is below the prescribed luminance, the control part 19 controls the strobe light emitting part 15 so as not to emit the light. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera that can perform high-quality shooting according to ambient brightness.

In recent years, as a camera that can easily take high-quality photos without strobe lighting, “Masahiro Kimura, utilizing color negative film” “Fuji Film“ Natural Photo System ”NATURA”, Photo Industry, Photo Industry Publishing Company, 2004 A natural photo system described in November 1, Vol. 62, No. 11, P43-45 (Patent Document 1) is known. According to this natural photo system, when the film sensitivity is equal to or higher than a predetermined sensitivity, it is possible to perform photographing with natural light without emitting light with a strobe, and it is possible to obtain a high-quality photograph.
Masahiro Kimura, “Fuji Film“ Natural Photo System ”NATURA”, which utilizes color negative film, Photo Industry, Photo Industry Publishers, November 1, 2004, Vol. 62, No. 11, P43-45

  However, the natural photo system described above may shoot a subject in a backlight state when the external light luminance is equal to or higher than a predetermined luminance.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a camera that can easily take a high-quality photograph and prevent the subject from being photographed in a backlight state.

  In order to solve the above problems, a camera of the present invention includes a sensitivity detection unit that detects imaging sensitivity of an imaging medium, a light emitting unit that emits light to a subject, a luminance detection unit that detects external light luminance, Detected when the sensitivity detection means detects that the sensitivity of the imaging medium is equal to or higher than a predetermined sensitivity, and the external light brightness detected by the brightness detection means is in a predetermined first brightness area. Exposure control is performed based on the exposure target value calculated by subtracting the first exposure correction value from the exposure reference value corresponding to the brightness, and the sensitivity detecting means detects that the sensitivity of the imaging medium is equal to or higher than a predetermined sensitivity. If the external light luminance detected by the luminance detection means is in the second luminance region set to a region larger than the first luminance region, the first exposure correction is performed from an exposure reference value. Less than value The exposure control means for performing exposure control based on the exposure target value calculated by subtracting the second exposure correction value set to, and the sensitivity detection means detects that the sensitivity of the imaging medium is equal to or higher than a predetermined sensitivity. And when the subject is determined to be backlit, the light emitting means is caused to emit light, and the sensitivity detecting means detects that the sensitivity of the imaging medium is equal to or higher than a predetermined sensitivity. And a light emission control means for controlling the light emission means not to emit light when it is determined that the backlight is not in the backlight state.

  According to the present invention, when the sensitivity detection unit detects that the sensitivity of the imaging medium is equal to or higher than the predetermined sensitivity, and the outside light luminance detected by the luminance detection unit is in the predetermined first luminance region. Performs exposure control based on the exposure target value calculated by subtracting the first exposure correction value from the exposure reference value, and when the external light luminance is in the predetermined second luminance luminance region, the second exposure is performed. Exposure control is performed based on an exposure target value calculated by subtracting the exposure value from the exposure reference value with a correction value. Further, it is possible to control so that the light emitting means emits light when the subject is in the backlight state, and the effecting means is not emitted when the subject is not in the backlight state. As a result, when the imaging medium has a predetermined sensitivity or more and the external light luminance is in the first luminance region and the external light luminance is relatively dark, without performing light emission control by the light emitting means, By performing exposure control, the subject can be photographed with natural light. On the other hand, when shooting in a bright place with a predetermined luminance or higher, the subject may be in a backlight state due to the brightness of the external light, but the backlight state can be prevented due to light emission by the light emitting means.

  Further, the light emission control means of the present invention determines that the subject is in a backlight state when the external light brightness detected by the brightness detection means is equal to or higher than a predetermined brightness that makes the subject in a backlight state, and the brightness detection means When the external light luminance detected by the above is smaller than the predetermined luminance, it is preferable to determine that the subject is not in the backlight state.

  According to the present invention, it is possible to determine the backlight condition of the subject based on whether or not the external light luminance is greater than or equal to a predetermined value. The light emitted by the light emitting means may cause trouble for a third party, but since it is a relatively bright place where the external light luminance is equal to or higher than a predetermined luminance, the light emitted by the light emitting means is less likely to cause trouble for the third party. Become.

  Further, it is preferable that the light emission control means of the present invention determines whether or not the subject is in a backlight state based on a ratio or luminance difference between the central portion and the outer portion in the range to be photographed.

  According to the present invention, it is determined that the subject is in the backlight state by determining that the subject is in the backlight state based on the ratio or luminance difference between the center portion and the outer portion in the range to be photographed. Can do. Therefore, it is possible to reliably realize high quality shooting.

  According to the present invention, it is possible to easily perform shooting with light that is close to reality, and when the subject is in a backlight state, the backlight state can be prevented by light emission by the light emitting means.

  The present invention can be readily understood by considering the following detailed description with reference to the accompanying drawings shown for the embodiments. Subsequently, embodiments of the present invention will be described with reference to the accompanying drawings. Where possible, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a perspective view of the camera 10 of the present embodiment. As shown in FIG. 1, the lens shutter camera is loaded with a 135 film format cartridge. The camera 10 is provided with a release button 11 at its upper end. At the center of the front surface of the camera 10, a lens barrel 20 (with a shutter unit 16 to be described later) incorporated therein is attached. As the lens barrel, a photographing lens barrel including an autofocus operation including a focus lens 8 and a shutter is used. A finder 5, strobe light emitting unit 15, AF light projecting window 17 a and AF light receiving window 18 a are provided on the upper part of the camera 10. A light projecting unit (IRED (infrared light emitting diode)) 17 and a light receiving unit (PSD (position detecting element)) 18 which will be described later are arranged so that light can be emitted and received through the AF light projecting window 17a and the AF light receiving window 18a. The light projecting unit 17 and the light receiving unit 18 constitute a distance measuring unit that measures the distance to the subject based on the principle of triangulation, for example.

  The camera 10 is provided with a photometric unit 13. The photometry unit 13 functions as a luminance detection unit that measures the external light luminance within the photographing field of view. As the photometric unit 13, for example, a center-weighted average photometric sensor provided with one SPD device (incorporating an infrared cut filter on the optical path) is used. This SPD device is approximately oriented on the optical axis of the taking lens optical system.

  FIG. 2 is a block diagram of the camera 10 of the present embodiment. The camera 10 is applied to, for example, a lens shutter camera loaded with a 135 film format cartridge. The camera 10 includes a release button 11, a film sensitivity detection unit 12, a photometry unit 13, a memory unit 14, a strobe light emitting unit 15, a shutter unit 16, a light projecting unit 17, a light receiving unit 18, and a control unit 19. Hereinafter, each part will be described.

  The release button 11 is a button that is pressed when the user attempts to photograph a subject. When the release button 11 is pressed, the shutter unit 16 opens and closes the shutter.

  The film sensitivity detector 12 is a sensitivity detector that detects the sensitivity of a film loaded in a film loading unit (not shown). The film sensitivity detection unit 12 reads a portion representing sensitivity in the CAS code indicated by the film cartridge, and outputs the read information to the control unit 19. The control unit 19 can recognize the film sensitivity based on the output information. The film sensitivity is defined by ISO (International Organization for Standardization). The user may set the film sensitivity in manual operation.

  The photometry unit 13 is a luminance detection unit that detects the luminance of external light including the subject. Information indicating the luminance measured by the photometry unit 13 is output to the control unit 19, and the control unit 19 converts the external light luminance into a BV value (Brightness Value) in APEX units. An LV value (LightValue) (LV value = BV value + SV value) may be used.

  The memory unit 14 stores a correction control table, a program diagram, and an operation program. The correction control table is control information for storing the BV value and the ΔEV value in association with each other. The ΔEV value is an exposure correction value for correcting the exposure reference value. The exposure reference value is calculated, for example, by adding an SV value (Film Speed Value) in APEX units to the BV value. An EV value (Exposure Value), which is an exposure target value, is calculated by subtracting the exposure correction value ΔEV from the BV value plus the SV value.

  A specific example of this correction control table is shown. FIG. 3 is a conceptual diagram of the correction control table. As shown in FIG. 3, the BV value and the ΔEV value are stored in association with each other. Based on the information stored in the correction control table, a ΔEV value corresponding to the BV value detected by the photometry unit 13 is set. Then, the corrected exposure target value EV is calculated by subtracting the ΔEV value from the exposure reference value calculated by the BV value + SV value.

The program diagram is control information in which EV values shown in APEX units for exposure control are associated with TV values (Shutter Speed Value) and AV values (Aperture Values) that are also APEX units. The TV value indicates the shutter speed, and the AV value is information indicating the F value (lens aperture) (see FIG. 8).

  The operation program is a program for performing a series of control processes related to the shooting operation in the camera 10.

  The strobe light emitting unit 15 emits strobe light to the subject automatically or by user operation based on the external light luminance measured by the photometry unit 13. Note that the strobe light emitting unit 15 in the present embodiment can be set so that it cannot be used within a predetermined range (for example, BV value <3).

  Based on the exposure control (shutter speed and F value (lens aperture)) by the control unit 19, the shutter unit 16 opens with a diameter indicated by the F value, and closes when the time indicated by the shutter speed has elapsed. The image obtained through the lens is transferred to the film while the shutter portion 16 is open.

  The light projecting unit 17 is for measuring the distance to the subject and irradiates the subject with light.

  The light receiving unit 18 calculates the distance to the subject based on the light reflected from the subject by the light emitted by the light projecting unit 17. Specifically, the light receiving unit 18 outputs information indicating the light amount based on the received light to the control unit 19, and the control unit 19 calculates the distance to the subject based on the input information indicating the light amount. . The light projecting unit 17 and the light receiving unit 18 constitute a distance measuring unit.

  The control unit 19 is a control unit that controls the entire camera, and includes, for example, a CPU, a ROM, a RAM, an input signal circuit, an output signal circuit, and the like. This control part 19 performs the operation | movement flowchart mentioned later. For example, when the pressing of the release button 11 is detected, an instruction to operate the shutter unit 16 is output. Further, the film sensitivity is determined based on information from the film sensitivity detection unit 12. Further, the BV value is calculated based on the information indicating the light amount of the subject output from the photometry unit 13. When the state where the release button 11 is half-pressed is detected, the distance measuring unit is operated. Further, a corrected exposure target value is calculated by subtracting an exposure correction value (ΔEV) from the exposure reference value, exposure control is performed based on the exposure target value, and whether or not shooting is performed with flash emission based on the photometric value is determined. Judge and control. As described above, the control unit 19 also functions as an exposure control unit that performs exposure control and a light emission control unit that controls strobe light emission.

  Next, the operation | movement in exposure control of the camera 10 comprised in this way is demonstrated.

  First, an outline of exposure control in the camera 10 of the present embodiment will be described. FIG. 4 is a conceptual diagram of exposure control in the first embodiment, and schematically shows the correspondence between the BV value and the ΔEV value stored in the correction control table.

  As shown in FIG. 4, the vertical axis represents ΔEV value and the horizontal axis represents BV value. When the BV value is in the range of 0 to 3 (first luminance region), the ΔEV value is 2. Further, when the BV value is in the range of 3.5 to 9 (second luminance region), the ΔEV value is 1. Then, the exposure target value is calculated using the ΔEV value obtained here. That is, the exposure target value is calculated by subtracting the ΔEV value from the exposure reference value (Bv + Sv) obtained by adding the SV value to the BV value. Exposure control is performed using the EV value thus obtained. In FIG. 4, the ΔEV value in the first luminance area is 2 and the ΔEV value in the second luminance area is 1 and is expressed as a fixed value. However, the value is not limited to a fixed value. That is, in the graph of FIG. 4, the exposure correction characteristic may be inclined so as to increase or decrease the ΔEV value according to the BV value.

  Here, the first luminance region is a portion showing brightness assuming artificial lighting such as indoors. In recent years, since the atmosphere is emphasized, light sources having a low color temperature (about 3000K) such as tungsten and light bulb-colored fluorescent lamps are often used. Therefore, since the photometry of the camera is performed with a spectral sensitivity according to the standard relative luminous sensitivity, blue exposure tends to be insufficient under illumination with a low color temperature. Therefore, in the first luminance region, the two-level exposure is increased by the EV value so that the blue exposure can be increased. That is, the exposure target value is corrected to increase the exposure by subtracting the ΔEV value by 2 from the normal exposure reference value. Here, in order to surely perform shooting with natural light, it is possible to prevent the strobe light emitting unit 15 from emitting light. Specifically, when the BV value is in the first luminance region, a program that prohibits the light emission of the strobe light emitting unit 15 can be used. However, even in this case, it is possible to force the strobe to emit light by a user operation.

  The first luminance area is from the lower limit BV value of the shutter controllable range to a value where the BV value is 3. The lower limit of the shutter controllable range is the speed when there is a restriction on the shutter speed such as camera shake restriction. If there is no restriction, the BV value is in the range from -3 to 3.

  Further, the second luminance area is a portion showing the brightness assuming the time of cloudy or sunny weather outdoors. The color temperature in the second luminance area is moderate (about 5000K (Kelvin)), and when the BV value acquired by the camera is within the range of the second luminance area, giving appropriate exposure in most shooting environments. Appropriate shooting can be performed. Therefore, for the second luminance area, it is necessary to take into account variations in the amount of light in the shooting state. Then, in order to prevent the overall exposure from becoming insufficient, the EV value is increased by one step. That is, the exposure target value is corrected to increase the exposure by subtracting 1 from the exposure reference value calculated by the BV value + SV value.

  Note that the second luminance region is from a value where the BV value is 3.5 to the upper limit BV value of the shutter controllable range. The upper limit of the shutter controllable range is a speed when the shutter speed is increased to the limit or a range that can be controlled as a program.

  If the average correction value of the ΔEV value in the first luminance region is ΔE1 and the average correction value of the ΔEV value in the second luminance region is ΔE2, if the ΔEV value satisfying ΔE1−ΔE2 ≧ 0.8 can be obtained, An exposure correction value other than the ΔEV value shown in FIG. 4 may be set. Hereinafter, the reason why it is preferable to satisfy ΔE1−ΔE2 ≧ 0.8 will be described.

The spectral sensitivities for each wavelength in the red-sensitive layer, green-sensitive layer, and blue-sensitive layer in the color negative are Sr, Sg, and Sb. Further, when the relative intensities for each wavelength at the relative energy of 5000 K (Kelvin) and 3000 K (Kelvin) of the light source are I5000 and I3000, the result shown in the following formula (1) is obtained.

  Generally, the spectral sensitivity for each color in the color negative is as shown in the graph of FIG. Further, the relative intensity at the color temperature of a typical light source (indoor light source, outdoor light source) is as shown in the graph of FIG. Equation 1 below is a ratio calculated by multiplying the relative spectral sensitivity and the relative intensity at each wavelength of the green-sensitive layer and the blue-sensitive layer shown in FIGS. 5 and 6 and cumulatively adding them. .

From this formula (1), in the light source having a relative energy of 3000K, the blue-sensitive layer can only sensitize 1 / 2.15 light to the green-sensitive layer as compared with the light source having a relative energy of 5000K. Recognize. Based on the value calculated here, the exposure difference is converted using the following equation (2).

  This calculation result means that in the color negative, the blue-sensitive layer is exposed less by 1.11 in terms of the EV value than the green-sensitive layer.

  The photometry of the camera is performed with the standard relative luminous sensitivity according to the spectral sensitivity of the green sensitive layer. For this reason, if exposure correction of +1.11 in EV value is performed on the camera photometric value, appropriate exposure can be given also to the blue-sensitive layer. On the other hand, exposure correction of +1.11 in EV value is also applied to the green sensitive layer. However, since the color negative has a large latitude for overexposure, there is no problem even if it is overexposed.

  Then, it is preferable to perform exposure correction with a difference of 0.8 or more as an EV value (that is, ΔE1−ΔE2 ≧ 0.8) as a numerical value in consideration of actual light source variation and the like. When the ΔEV value is set to a substantially constant value in the first luminance region and the second luminance region (including a case where the ΔEV value is slightly increased or decreased), ΔE1 and ΔE2 are defined as average values in the respective ranges. Further, when the control is not such that the ΔEV value becomes a constant value (when the ΔEV value varies by 0.5 or more in each luminance region), the minimum value in the first luminance region is adopted as ΔE1, and ΔE2 is adopted. Adopts the maximum value in the second luminance region.

  The numerical condition of ΔE1−ΔE2 ≧ 0.8 is a numerical condition calculated in comparison with the 3000K and 5000K light sources, but there are various light sources in the real world. For example, when the above formula (2) is calculated in a comparison with a light source having a high color temperature, the EV value may be 0.5 to 0.8. In such a case, it is also preferable to set ΔE1−ΔE2 ≧ 0.5 as a numerical value assuming all light sources that actually exist.

  Next, a specific operation of the camera 10 capable of performing strobe light emission based on the above-described concept of exposure control will be described. FIG. 7 is a flowchart showing the operation of the camera 10. The control process of this flowchart is executed by the control unit 19 based on a program stored in the memory unit 14.

  When the control unit 19 determines that the release button 11 of the camera 10 has been pressed (S1), the control unit 19 outputs an instruction to the photometry unit 13 to perform photometry processing. The photometry unit 13 detects the external light luminance and outputs a detection signal. The control unit 19 calculates a BV value that is a luminance value based on the input detection signal (S2).

  The control unit 19 calculates the exposure reference value by adding the SV value and the BV value corresponding to the film sensitivity (S3). For example, the EV value is calculated using a mathematical formula of EV value = BV value + SV value. Specifically, the APEX unit of the ISO 1600 film is +9, and when the BV value is 3, the exposure reference value is 9 + 3 = 12.

  Then, the control unit 19 determines whether or not the film sensitivity detected by the film sensitivity detection unit 12 is equal to or higher than the sensitivity indicated by ISO 1600 (S4).

  When the control unit 19 determines that the film sensitivity is equal to or higher than the sensitivity indicated by ISO 1600, the control unit 19 corrects the exposure reference value (S5). Specifically, the control unit 19 extracts a ΔEV value corresponding to the BV value calculated above from the correction control table. Then, the control unit 19 calculates the exposure target value by correcting the exposure reference value by subtracting the ΔEV value from the exposure reference value calculated in S3. That is, when the detected outside light luminance is in the predetermined first luminance region, the exposure target value is calculated by subtracting the first exposure correction value from the exposure reference value, and the detected outside light luminance is the first If it is in the second luminance area that is set larger than the luminance area, the exposure target value is calculated by subtracting the second exposure correction value from the exposure reference value. Note that the second exposure correction value is set to a value smaller than the first exposure correction value.

  The control unit 19 determines whether or not the photometric value obtained by the photometric unit 13 is equal to or higher than a predetermined luminance (S6). Here, the “predetermined luminance” refers to a luminance at which the subject is in a backlight state, for example, an external light luminance corresponding to an EV value = 14, and a value larger than the first luminance region. Is preferred. In S6, when the control unit 19 determines that the photometric value is not equal to or higher than the predetermined luminance, exposure control is performed using the exposure target value EV (S7). Here, the exposure control is to control the aperture (AV value) and shutter speed (TV value) of the lens. This exposure control is performed using, for example, a program diagram as shown in FIG.

  The control unit 19 instructs the shutter unit 16 to shoot using the determined shutter speed and F value, and the shutter unit 16 performs shooting. That is, the opening diameter of the shutter portion (blade) in the shutter portion 16 is opened by a size based on the F value, and the opening is closed after a predetermined time indicated by the shutter speed (S8).

  In S6, when the control unit 19 determines that the photometric value is equal to or higher than the predetermined luminance, exposure control is performed using the exposure target value EV (S9). Then, the control unit 19 instructs the flash unit 15 to emit light, and instructs the shutter unit 16 to shoot using the determined shutter speed and F value. The shutter unit 16 performs shooting in conjunction with the light emission by the strobe light emitting unit 15 (S10).

  If the film sensitivity is not ISO 1600 or higher in S4, exposure control is performed with the normal value EV value = BV value + SV value (S11), and then photographing is performed (S12). In S <b> 12, based on the photometric value obtained by the photometric unit 13, a photographing operation is performed by the shutter unit 16 in conjunction with light emission by the strobe light emitting unit 15 as necessary.

  In this way, exposure control based on film sensitivity can be performed, high-quality shooting can be performed without using strobe light emission, and the light emission by the strobe light emitting unit 15 is linked based on the photometric value. It is possible to take a picture and implement a countermeasure against backlighting of the subject. In addition, since the light emitting unit emits light when the luminance is higher than the predetermined luminance, it is possible to prevent a third party from being troubled by the light emission of the light emitting unit. In the present embodiment, the “backlight state” refers to a state in which the luminance of the main subject is darker than 1 EV with respect to the background luminance. Such detection of the backlight state may be performed using any means, but there is a method for estimating the backlight state by dividing the shooting region and performing photometry and comparing the luminance of the main subject with the background luminance. This is the simplest and preferred method. If exposure control is performed based on the photometric value obtained by photometry in the backlight state, the main subject is underexposed, resulting in an undesirable result. As a solution to this, a method of increasing the overall exposure so that the main subject is sufficiently exposed, or a method of emitting light by emitting auxiliary light and providing exposure to the main subject with sufficient illumination, There are two ways.

  In S6, instead of determining that the subject is in the backlight state by measuring the external light luminance, it is determined that the subject is in the backlight state based on the brightness of the subject and the surroundings (difference in luminance). It may be. A specific example is shown in FIG. FIG. 9 is a conceptual diagram showing the subject 100 shown in the finder 5 of the camera 10 and shows that the sun is located behind the subject 100 and the subject 100 is in a backlight state. The camera 10 determines the brightness of the central portion 102 of the finder 5 using a narrow angle luminance sensor (not shown) and determines the outside of the finder 5 using a wide angle luminance sensor (not shown) in order to determine that the subject 100 is backlit. The brightness of the portion 101 is measured. When the measured luminance ratio between the brightness of the central portion 102 and the brightness of the outer portion 101 (brightness of the central portion 102 ÷ brightness of the outer portion 101) is equal to or less than a predetermined value, or a difference in luminance (outside If the brightness of the portion 101−the brightness of the central portion 102) is equal to or greater than a predetermined value, the control unit 19 can determine that the backlight 19 is in the backlight state. That is, the control unit 19 can determine that the subject 100 is in the backlight state based on the ratio or luminance difference between the central portion 102 and the outer portion 101 in the photographed range (the range displayed on the viewfinder 5). . Thus, it is possible to perform reliable photographing by directly determining the backlight state of the subject 100.

  Next, exposure control in the second embodiment different from the exposure control shown in FIG. 4 will be described. FIG. 10 is a conceptual diagram of exposure control different from the exposure control shown in FIG.

  According to FIG. 10, for the first luminance region where the BV value is 0 to 5, the EV value is controlled to be increased by two stages. In addition, the EV value is not corrected for the second luminance region in which the BV value is 5.5 to 8. Further, in the second embodiment, when the BV value is less than 5, the strobe light is not emitted, and when the BV value is 5 or more (that is, when the predetermined brightness of S6 in FIG. 7 is BV value ≧ 5), the strobe light is not emitted. The light emission is controlled to always emit light. Thereby, at least when indoors, it is possible to take a photograph with high quality and atmosphere without using strobe light emission. In addition, even when using the strobe light emission, the subject does not often stand out due to the strobe light emission, and a high-quality photograph can be taken.

  As described above, according to the camera 10 according to the present embodiment, when the film sensitivity is high sensitivity of ISO 1600 or higher, the exposure correction value ΔEV1 of the first luminance area is changed to the exposure correction value ΔEV2 of the second luminance area. On the other hand, by setting a large value of at least 0.5 Ev on average, appropriate exposure control according to the shooting environment can be performed, and shooting with more realistic light can be easily performed without strobe light emission. In particular, in a shooting environment under indoor artificial lighting, appropriate exposure can be given to the blue-sensitive layer, and higher quality photography can be performed.

  At this time, when the exposure correction value ΔEV1 of the first luminance area is set to a large value of at least 0.8 Ev on average with respect to the exposure correction value ΔEV2 of the second luminance area, more appropriate exposure control according to the shooting environment can be performed, It is possible to easily perform shooting with light that is closer to reality without flashing. Also in this case, in a shooting environment under indoor artificial lighting, appropriate exposure can be given to the blue-sensitive layer, and higher quality photography can be performed.

  In addition, it is preferable that the camera according to the present embodiment includes a strobe light emitting unit that emits strobe light so that the strobe light emitting unit does not emit light when the external light luminance is a predetermined value or less. Thereby, it is possible to prevent photographing with artificial light by strobe light emission and easily perform photographing with light that is closer to reality.

  Although the present embodiment has been described based on a camera using a film, the camera according to the present invention is not limited to a camera using a film. For example, the present invention may be applied to a digital camera using a CCD. In this case, if the set sensitivity of the CCD is detected instead of detecting the film sensitivity and the set sensitivity is equal to or higher than the sensitivity corresponding to the ISO sensitivity 1600, the first brightness set to a lower brightness than the second brightness area. In the region, the exposure correction value is set to a large value of at least 0.5 Ev on average, and the exposure correction value is subtracted from the exposure reference value calculated based on the set sensitivity and the luminance value (Bv) to obtain an exposure target value. What is necessary is just to perform exposure control. Even in this case, the same effect as the camera according to the above-described embodiment can be obtained.

It is a perspective view of the camera of this embodiment. It is a block block diagram of the camera of this embodiment. FIG. 3 is a conceptual diagram of a correction control table in the camera of FIG. 2. It is a conceptual diagram of exposure control in the camera of FIG. It is a figure which shows the spectral sensitivity of a color negative. It is a figure which shows the relative intensity of a typical light source. It is a flowchart which shows operation | movement of the camera of FIG. It is a program diagram which shows the specific example of exposure control in the camera of FIG. 3 is a conceptual diagram showing a subject shown in a viewfinder 5 of a camera 10. FIG. It is a conceptual diagram of exposure control in a 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Camera, 11 ... Release button, 12 ... Film sensitivity detection part, 13 ... Photometry part, 14 ... Memory part, 15 ... Strobe light emission part, 16 ... Shutter part, 17 ... Light projection part, 18 ... Light reception part, 19 ... Control unit.

Claims (3)

Sensitivity detection means for detecting the imaging sensitivity of the imaging medium;
Light emitting means for emitting light to the subject;
Luminance detection means for detecting the ambient light luminance;
Detected when the sensitivity detection means detects that the sensitivity of the imaging medium is equal to or higher than a predetermined sensitivity, and the outside light brightness detected by the brightness detection means is in a predetermined first brightness area. The exposure control is performed based on the exposure target value calculated by subtracting the first exposure correction value from the exposure reference value corresponding to the brightness, and the sensitivity detection unit detects that the sensitivity of the imaging medium is equal to or higher than the predetermined sensitivity. In the case where the outside light brightness detected by the brightness detecting means is in the second brightness area set to an area larger than the first brightness area, the first exposure is determined from the exposure reference value. Exposure control means for performing exposure control based on the exposure target value calculated by subtracting the second exposure correction value set to a value smaller than the correction value;
When the sensitivity detection unit detects that the sensitivity of the imaging medium is equal to or higher than a predetermined sensitivity, and when it is determined that the subject is in a backlight state, the light emission unit is caused to emit light, and the sensitivity detection unit causes the imaging medium to A light emission control means for controlling the light emission means not to emit light when it is detected that the sensitivity is equal to or higher than a predetermined sensitivity and the subject is determined not to be backlit;
With a camera. The light emission control unit determines that the subject is in a backlight state when the ambient light brightness detected by the brightness detection unit is equal to or higher than a predetermined brightness that causes the subject to be in a backlight state, and is detected by the brightness detection unit. The camera according to claim 1, wherein when the external light luminance is smaller than the predetermined luminance, the subject is determined not to be in a backlight state. 2. The camera according to claim 1, wherein the light emission control unit determines whether or not the subject is in a backlight state based on a ratio or luminance difference between a central portion and an outer portion in an imaged range.

Images