JP2949766B2 - Camera exposure control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an exposure control device for a camera.

[Prior Art] In general, an AE camera detects the brightness of a subject (hereinafter referred to as subject brightness) by a photometric device, calculates an exposure value based on the subject brightness and the sensitivity of a film to be used, and calculates an exposure value based on the exposure value. The camera is driven by driving the aperture and shutter. When the subject brightness is lower than a predetermined value, the built-in electronic flash device automatically emits light.

[Problems to be Solved by the Invention] However, in the case where the shooting environment is outdoors, if the exposure is determined only by the subject luminance and the film sensitivity, the proper exposure will not be obtained, and the atmosphere actually seen and the printed photo will not be obtained. There is a risk that the atmosphere will be far away from the atmosphere.

For example, even at dusk, the photo looks the same as in the daytime, the color of the sunset does not appear in the photo, or when photographing the summer beach or snow scene where the sunshine is strong, the sandy beach and the snow become gray. I do. To cope with such a phenomenon, the photographer may correct the exposure by a manual operation, but for that purpose, experience and skill are required to obtain a proper exposure, and the operation is troublesome.

The technical problem of the present invention is to minimize the difference between the atmosphere actually seen with the eyes and the atmosphere on a printed photograph without performing a troublesome operation, even under the above-described circumstances. .

[Means for Solving the Problems] An exposure control device for a camera according to the first aspect of the present invention includes: an exposure value calculating unit that calculates an exposure value according to the luminance of a subject; and an indoor or outdoor shooting environment. Indoor / outdoor determining means for determining whether or not there is, exposure value correcting means for correcting the exposure value calculation by the exposure value calculating means, time detecting means for detecting the time of shooting, and time based on the time obtained by the time detecting means. Determination means for determining whether or not the present time is at twilight, and the exposure value correction means corrects the exposure value when the shooting environment is determined to be outdoors and when it is determined to be at twilight. The exposure value calculation by the exposure value calculation means is corrected so as to be lower by a predetermined amount than usual.

The exposure control device for a camera according to the second aspect of the present invention includes the exposure value calculation means, indoor / outdoor determination means, exposure value correction means,
In addition to the time detecting means, a season detecting means for detecting a season at the time of shooting is provided, and the correction by the exposure value correcting means is determined that the shooting environment is outdoors, and the detected season is summer or winter, In addition, when the detected time is in the daytime, the exposure value calculation by the exposure value calculation means is corrected so that the exposure value exceeds a normal amount by a predetermined amount.

According to a third aspect of the present invention, there is provided an exposure control device for a camera, wherein in addition to the exposure value calculating means and the time detecting means, a date detecting means for detecting a date at the time of photographing, and geographic information for inputting geographic information. Input means, a sunrise / sunset detection means for detecting a sunrise time and a sunrise time based on the detected date and the inputted geographic information, a time detected by the time detection means and the sunrise Judgment means for judging whether or not the current time is twilight based on the sunrise time and sunset time detected by the sunshine detection means. Exposure value correction means for correcting the exposure value calculation by the exposure value calculation means so as to be lower by a predetermined amount than the exposure value calculation means.

According to a fourth aspect of the present invention, in addition to the third aspect of the present invention, the camera exposure control device further includes an indoor / outdoor determining means for determining whether the shooting environment is indoor or outdoor. The correction is performed by adding the correction to the exposure value calculation by the exposure value calculation means so that the exposure value is lower than usual when the twilight is determined by the determination means and when the indoor / outdoor determination means determines that the camera is outdoors. I have to.

According to a fifth aspect of the present invention, there is provided an exposure control apparatus for a camera, wherein the indoor / outdoor determination means, the time detection means, and the determination means for determining whether or not the present time is twilight based on the time obtained by the time detection means. In the case where the indoor / outdoor determining means determines that the shooting environment is outdoors and the determining means determines that the image is in twilight, the electronic flash device in the twilight state is corrected by adding a correction to the predetermined value of the subject luminance. Prohibiting means for prohibiting the light emission of

The exposure control device for a camera according to the invention according to claim 6, wherein the indoor / outdoor determination unit, the time detection unit, the date detection unit, the geographic information input unit, the sunrise / sunset detection unit, and the time detected by the time detection unit. In addition to the determination means for determining whether or not the current time is twilight based on the sunrise time and the sunset time detected by the sunrise and sunset detection means, the indoor and outdoor determination means is determined to be outdoor, And a prohibition means for prohibiting light emission of the electronic flash device in a twilight state by adding a correction to the predetermined value of the subject brightness when the determination means determines that the light is twilight.

According to a seventh aspect of the present invention, in the camera exposure control apparatus according to the fifth or sixth aspect, a distance measuring means for measuring a subject distance is further provided, and when the measured subject distance is a short distance. The light emission control means causes the electronic flash device to emit light.

The exposure control apparatus for a camera according to the invention of claim 8 is the invention according to claim 1, 2, 4, 5 or 6, wherein the indoor / outdoor determination means analyzes the color temperature of a light source in the shooting environment to determine the shooting environment. It is determined whether it is indoor or outdoor.

According to a ninth aspect of the present invention, in the exposure control apparatus for a camera according to the first, second, fourth, fifth or sixth aspect, the indoor / outdoor determining means analyzes a frequency of a light source in the shooting environment to determine whether the shooting environment is indoors. Or whether it is outdoors.

[Operation] In the camera exposure control device according to the first aspect of the present invention, the indoor / outdoor determining means determines that the shooting environment is indoors,
Further, the exposure value calculation by the exposure value calculation means is corrected so that the exposure value is lower than usual by a predetermined amount when it is determined that the light is twilight.

The exposure control apparatus for a camera according to the second aspect of the present invention determines that the shooting environment is indoors, that the season detecting means detects summer or winter, and that the time detecting means determines that it is daytime. Then, the exposure value calculation means corrects the exposure value calculation by the exposure value calculation means so that the exposure value exceeds the normal value by a predetermined amount.

According to a third aspect of the present invention, in the camera exposure control apparatus, the determination unit is currently dim based on the time detected by the time detection unit and the sunrise time and the sunset time detected by the sunrise / sunset detection unit. When it is determined that it is time, the exposure correction means corrects the exposure value calculation by the exposure value calculation means so that the exposure value is lower than usual by a predetermined amount.

In the exposure control device for a camera according to the invention of claim 4, the indoor / outdoor determining means determines that the shooting environment is outdoors,
When it is determined by the determining means that the light is twilight, the exposure correcting means corrects the exposure value calculation by the exposure value calculating means so that the exposure value becomes lower than usual.

The exposure control device for a camera according to the fifth aspect of the invention determines that the shooting environment is outdoors by the indoor / outdoor determination means,
If the determination unit determines that the light is twilight, the prohibition unit corrects the predetermined value of the subject luminance to prohibit the light emission of the electronic flash device in the twilight state.

In the exposure control device for a camera according to the invention of claim 6, the present time is twilight based on the time detected by the time detecting means and the sunrise time and the sunset time detected by the sunrise and sunset detecting means. When the twilight is determined by the determining means for determining whether or not the light is illuminated, and when the indoor / outdoor determining means determines that the light is outdoors, the prohibition means corrects the predetermined value of the subject brightness to thereby correct the electronic flash device in the twilight state. Prohibits light emission.

According to a seventh aspect of the present invention, in the camera exposure control apparatus according to the fifth or sixth aspect, when the subject distance measured by the distance measuring means is a short distance, the light emission control means causes the electronic flash device to emit light.

The exposure control device for a camera according to the invention of claim 8 is the invention according to claim 1, 2, 4, 5, or 6, wherein the indoor / outdoor determination means analyzes the color temperature of the light source in the shooting environment to determine whether the shooting environment is indoors. It is determined whether it is located or outdoors.

According to a ninth aspect of the present invention, in the camera exposure control apparatus according to the first, second, fourth, fifth, or sixth aspect, the indoor / outdoor determining means analyzes the frequency of the light source in the shooting environment to determine whether the shooting environment is indoors. It is determined whether it is located or outdoors.

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the camera of the present invention. In FIG. 1, a photometric condenser lens 1 guides light within a photographic field angle to a light receiving element 2.
5 is a CP that controls each unit according to information obtained from each unit.
U. Reference numeral 3 denotes frequency analysis means for analyzing the frequency of a light receiving signal input from the light receiving element 2. As a result of the analysis, if the received light signal has a specific frequency (50 HZ or 60 HZ), it is determined that the measured light is from an artificial light source such as a fluorescent lamp, and if the light has no specific cycle. It can be determined that this is due to outdoor sunlight. That is, if the light source is an artificial light source, it can be determined that the shooting environment is indoor, and if the light source is the sun, the shooting environment is outdoor.
Reference numeral 4 denotes a luminance calculation circuit that calculates a luminance value from the light receiving signal. Reference numeral 6 denotes a timer for outputting date information and time information to the CPU 5. Based on the date information from the timer 6, it is possible to determine which season the current season corresponds to in the spring, summer, autumn and winter. Reference numeral 7 denotes geographic information input means for inputting geographic information, for example, latitude and longitude information. The CPU 5 corrects the time difference based on the geographic information from the geographic information input means 7 to obtain the current time, , Sunrise time, etc. are required. Reference numeral 8 denotes an exposure control unit that performs exposure control. Reference numeral 9 denotes distance measuring means for measuring the distance between the subject and the camera. Reference numeral 10 denotes a strobe light emitting unit that emits a strobe light, and emits a strobe light according to an instruction from the CPU 5 when the subject luminance is equal to or less than a predetermined value. Although not shown in FIG. 1, the half-press switch and the full-press switch are
The shutter release button is connected to the CPU 5 and detects a half-pressed state and a fully-pressed state of the shutter release button, respectively.

Next, the operation of the first embodiment will be described with reference to the flowcharts of FIGS.

In FIG. 2, when the shutter release button is half-pressed and the half-press switch is turned on, the operation starts,
The geographic information is read from the geographic information input means 7 (step 101), the date and time information and the time information are read from the timer 6, and the current accurate time is read in accordance with the geographic information read in step 101. , And sunrise and sunset times are obtained (step 102). Then, a distance measuring operation and a photometric operation are performed (steps 103 and 104), and an exposure calculation is performed (step 105). It is determined whether the season determined on the basis of the date information obtained in step 102 is summer or winter and whether the current day is during the day based on the time information (step 106). In other words, if it is determined that the day is in summer or winter,
, The frequency of the light source is analyzed (step 107), and it is determined whether or not the light source has periodicity (step 108).
After performing the exposure plus correction on the exposure calculation result obtained in step 5, an exposure value instruction is given to the exposure control unit 8 (step 109). The reason for correcting overexposure in a summer or winter daytime shooting environment is to prevent sandy beaches and snow from turning gray when shooting white sandy beaches under strong sunlight in the summer or shooting snowy landscapes in winter. That's why.

Next, it is determined whether or not the subject distance obtained by the distance measuring operation in step 103 is a short distance enough for the strobe to effectively reach (step 110). Normal exposure control is performed by the exposure control unit 8 in response to the switch being turned on, and photographing is performed (step
111), shooting is completed.

If there is periodicity in step 109, that is, if it is indoors, normal exposure control is immediately performed (step 11).
1), shooting is completed.

If “Y” in step 110, that is, if the subject distance is short, exposure is started in response to turning on the full-press switch (step 112), a flash is fired (step 113), and the exposure is terminated (step 113). Step 114) The photographing is completed.

On the other hand, if it is not "N" in step 106, that is, if it is not during the summer or winter day, the flow directly goes to the connector A in FIG.

FIG. 3 is a flowchart showing the operation after the connector A.

First, by comparing the current time obtained in step 102 of FIG. 2 with the sunrise and sunset times, it is determined whether or not the present time is twilight (step 201), and "Y", that is, twilight If it is time, the frequency of the light source is analyzed by the frequency analysis means 3 (step 202), and it is determined whether or not the light source has periodicity (step 203). , After performing the exposure minus correction on the exposure calculation result obtained in step 105 of FIG.
An exposure value instruction is given to the exposure control unit 8 (step 204).
It is determined whether or not the subject distance obtained by the distance measuring operation in step 103 is a short distance enough for the strobe to effectively reach (step 205). Exposure is controlled by the exposure control unit 8 in accordance with, and photographing is performed (step 206). In this case, the light emission of the strobe light emitting device 10 is prohibited, so that the underexposure exposure can appropriately capture the situation at twilight (morning sun or sunset). The photographing is completed as described above.

If there is periodicity in step 203, that is, if it is indoors, normal exposure control is immediately performed (step 20).
6), shooting is completed.

On the other hand, if "Y" in the above step 205, that is, if the subject distance is short, the same operation as steps 112 to 114 in FIG. 2 is performed to complete the photographing (steps 207 to 209). In this case, the subject is properly exposed by the strobe light, and the background to which the strobe light does not reach is underexposed, so that the situation at twilight is appropriately represented.

FIG. 4 is a block diagram showing a second embodiment of the camera of the present invention. The same reference numerals as in FIG. 1 denote the same parts, and a description thereof will be omitted.

First, the determination of the color temperature of the light source will be described. The light sources have different spectral characteristics depending on the type, and the light intensity distribution differs depending on the wavelength. Therefore, the type of the light source can be determined by comparing the light intensity distributions. However, in practice, it can be almost discriminated by comparing two wavelength ranges. For this reason, a method is employed in which the intensity distribution of light on the long wavelength side and the light intensity distribution on the short wavelength side in the visible light range are compared to determine.
For example, sunlight at twilight has high light intensity on the long wavelength side, and light from a fluorescent lamp has high light intensity on the short wavelength side. If this is expressed in color temperature, the former has a high color temperature and the latter has a low color temperature. Therefore, by comparing the intensity distributions of the light in the two wavelength ranges, that is, the long wavelength side and the short wavelength side, it is possible to determine the level of the color temperature, that is, the type of the light source.

In FIG. 4, reference numerals 11a and 11b denote filters having different spectral transmittances. The filter 11a is formed of a material that transmits light on the short wavelength side but does not transmit light on the long wavelength side. It is formed of a material that does not transmit light on the side but transmits light on the long wavelength side. Therefore, filter 11
The light on the short wavelength side transmitted through a is condensed on the light receiving element 13a via the condensing lens 12a. On the other hand, the light on the long wavelength side transmitted through the filter 11b is focused on the light receiving element 13b via the focusing lens 12b. By comparing the intensity of the light receiving signals of the light receiving elements 13a and 13b,
Of the components of the light source, it is possible to determine whether the light intensity on the short wavelength side or the long wavelength side is higher. Therefore, the light source color temperature determining means 14 compares the intensity of the two types of received light signals to determine the color temperature of the light source. Can be determined. As a result, when the light intensity on the short wavelength side is strong (color temperature is low), it is possible to determine that the shooting environment is indoors, and when the light intensity on the long wavelength side is strong (color temperature is high), the shooting environment is determined. Can be determined to be outdoors.

Next, the operation of the second embodiment will be described with reference to the flowcharts of FIGS.

In FIG. 5, the half-press switch SW1 is turned on,
The operation starts. Steps 301 to 305 are the same as steps 101 to 105 in FIG. It is determined whether the season determined based on the date information obtained in step 302 is summer or winter, and whether the current day is during the day based on time information (step 306).
If "Y", that is, if it is determined that the day is summer or winter, the color temperature of the light source is analyzed by the light source color temperature determining means 14 (step 307), and the level of the color temperature is determined (step 308). If the color temperature is high, that is, if the color temperature is outdoors, the exposure calculation result obtained in step 305 is subjected to a plus correction of the exposure, and an instruction of the exposure value is given to the exposure control unit 8 (step 309). ). It is determined whether or not the subject distance obtained by the distance measuring operation in the above step 303 is a short distance that the strobe can effectively reach (step 310).
"N", that is, if the distance is not a short distance, normal exposure control is performed by the exposure control unit 8 in response to turning on of the full-press switch, and photographing is performed (step 311), and photographing is completed.

If the color temperature is low in step 308, that is, if the color temperature is indoors, normal exposure control is immediately performed (step 311), and photographing is completed.

If “Y” is determined in step 310, that is, if the subject distance is short, exposure is started in response to the full-press switch being turned on (step 312), and a strobe light is emitted (step 313). Exposure ends (step 314), and shooting is completed.

On the other hand, if the color temperature is low in step 306, that is, if the room is indoors, the process directly proceeds to the connector B in FIG.

FIG. 6 is a flowchart showing the operation after the connector B.

First, by comparing the current time obtained in step 302 of FIG. 5 with the sunrise and sunset times, it is determined whether or not the present time is at twilight (step 401), and "Y", that is, twilight If it is time, the color temperature of the light source is analyzed by the light source color temperature determining means 14 (step 402), and the level of the color temperature is determined (step 403). The exposure calculation result obtained in step 305 of FIG. 5 is subjected to a negative exposure correction, and an exposure value instruction is given to the exposure control unit 8 (step 404).

It is determined whether or not the subject distance obtained by the distance measuring operation in step 303 of FIG. 5 is a short distance enough to effectively reach the strobe (step 405). When the switch is turned on, exposure control is performed by the exposure control unit 8 to perform photographing (step 40).
6), shooting is completed. On the other hand, if "Y" in step 405, that is, if the subject distance is short, the same operation as in steps 312 to 314 in FIG. 5 is performed to complete photographing (steps 407 to 409).

If the color temperature is low in step 403, that is, if it is indoors, normal exposure control is immediately performed (step 403).
406), the shooting is completed.

FIG. 7 is a block diagram showing a third embodiment.
The same reference numerals as those in the drawings denote the same parts, and a description thereof will be omitted.
The print exposure signal recording means 8a in FIG. 7 corresponds to the exposure control section 8 in FIG. That is, in the third embodiment, the exposure compensation is not performed at the time of photographing, and the print exposure signal recording means 8a sends an exposure compensation signal corresponding to the exposure compensation value to the recording means provided in advance on the film. Record. When the film is printed, if the exposure is corrected in accordance with the exposure correction signal recorded in the recording means of the film, a print having the same exposure correction as that taken in the first and second embodiments is made. Is obtained. Further, it goes without saying that the third embodiment can also be applied to a system using a recording medium such as a magnetic disk instead of a film like a video still camera.

FIG. 8 is a block diagram showing a fourth embodiment.
The same reference numerals as those in the drawings denote the same parts, and a description thereof will be omitted.
The image luminance signal generation and recording means 8b in FIG. 8 corresponds to the exposure control section 8 in FIG. That is, in the fourth embodiment, a video camera or the like is assumed instead of a general camera, and an image luminance signal is corrected instead of performing exposure correction.

[Effect of the Invention] According to the invention of claim 1, whether the shooting environment is indoors,
In addition to detecting whether it is outdoors or not, the time is detected to determine whether or not it is at twilight, and the exposure value calculation is corrected so that the exposure value is a predetermined amount lower than usual when outdoors and at twilight. Therefore, the hue of dawn or sunset outdoors can be displayed on a photograph without manually performing exposure correction.

According to the second aspect of the present invention, in addition to the time and indoor / outdoor determination, a season is detected, and when summer or winter daytime and outdoors, the exposure value exceeds a predetermined amount than usual. Since the exposure value calculation is corrected so that it becomes as follows, without manually performing exposure correction, for example,
It is possible to prevent underexposure during backlit shooting on the summer shore where sunlight is strong outdoors or shooting against a snowy background.

According to the third aspect of the present invention, the geographical information is input, and the date is detected to detect the sunrise / sunset time, and based on the sunrise / sunset time and the current time. Detects whether the current time is twilight or not, and in twilight, corrects the exposure value calculation so that the exposure value is lower than usual by a predetermined amount, so that the exposure is more accurate in the shooting environment at twilight. Value operations can be corrected.

According to the invention of claim 4, in addition to the invention of claim 3, the exposure value calculation is corrected so that the exposure value is lower than usual by a predetermined amount when the shooting environment is outdoors and at twilight. Therefore, the exposure value calculation can be more accurately corrected in an outdoor and under dim shooting environment.

According to the fifth aspect of the present invention, the light emission of the electronic flash device is prohibited in the twilight, so that the color of the morning sun and the sunset is displayed on the photograph in the twilight outdoors without manual exposure correction. be able to.

According to the invention of claim 6, while entering geographical information and detecting the date, the sunrise and sunset times are detected, and based on the sunrise and sunset times and the current time. Detects whether or not the current time is twilight, and prohibits the emission of the electronic flash device at twilight, so the color of the morning sun and sunset is displayed on the photograph in twilight outdoors without manual exposure compensation. be able to.

According to the invention of claim 7, in the invention of claim 5 or 6, the electronic flash device is forcibly emitted when the subject distance is short, so that the close subject can be appropriately photographed in twilight outdoors. Can be.

According to the eighth aspect of the present invention, in the first, second, fourth, fifth or sixth aspect of the present invention, the indoor / outdoor determination can be made based on the result of analyzing the color temperature of the light source in the shooting environment.

According to the ninth aspect of the present invention, in the first, second, fourth, fifth or sixth aspect, the indoor / outdoor determination can be made based on the result of analyzing the frequency of the light source in the shooting environment.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of an exposure control device for a camera according to the present invention, FIGS. 2 and 3 are flowcharts in the same embodiment, and FIG. 4 is a block diagram showing a second embodiment. 5 and 6 are flowcharts in the same embodiment, FIG. 7 is a block diagram showing a third embodiment, and FIG. 8 is a block diagram showing a fourth embodiment. 3 ... frequency analysis means, 4 ... brightness calculation circuit, 5 ... CPU, 6
... Timer, 7 ... Geographic information input means, 8 ... Exposure control unit, 8a
... Print exposure signal recording means, 8b image luminance signal generation recording means, 9 distance measuring means, 10 strobe light emitting means, 14 light source color temperature discriminating means.

Claims (9)

(57) [Claims] An exposure value calculating means for calculating an exposure value in accordance with a luminance of a subject; an indoor / outdoor determining means for determining whether a shooting environment is indoor or outdoor; and an exposure by the exposure value calculating means. Exposure value correction means for correcting the value calculation; time detection means for detecting the time of shooting; and determination means for determining whether or not the present time is twilight based on the time obtained by the time detection means. The correction by the exposure value correction means is performed such that the exposure value is lower than usual by a predetermined amount when it is determined that the shooting environment is outdoors and when it is determined that the twilight is determined. An exposure control device for a camera, wherein the exposure value calculation by the value calculation means is corrected. 2. An exposure value calculating means for calculating an exposure value according to the brightness of a subject; an indoor / outdoor determining means for determining whether a shooting environment is indoor or outdoor; Exposure value correction means for correcting the value calculation, time detection means for detecting the time at the time of shooting, and season detection means for detecting the season at the time of shooting. When the environment is determined to be outdoors, and the detected season is summer or winter, and the detected time is daytime, the exposure value is set to exceed a normal value by a predetermined amount. An exposure control device for a camera, wherein the exposure value calculation by the value calculation means is corrected. 3. Exposure value calculating means for calculating an exposure value in accordance with the brightness of a subject, time detecting means for detecting a time at the time of shooting, and date detecting means for detecting a date at the time of shooting. Geographic information input means for inputting geographic information; sunrise and sunset detection means for detecting a sunrise time and a sunset time based on the detected date and the input geographic information; and the time detection Determining means for determining whether or not the present time is twilight based on the time detected by the means and the sunrise time and sunset time detected by the sunrise / sunset detecting means; An exposure value correction means for correcting the exposure value calculation by the exposure value calculation means so that the exposure value is lower than normal by a predetermined amount when it is determined that the time has elapsed. Exposure control device. 4. An indoor / outdoor determining means for determining whether an image capturing environment is indoor or outdoor, wherein the correction by the exposure value correcting means is determined by the determining means to be at twilight, and 4. The exposure of a camera according to claim 3, wherein the exposure value calculation by the exposure value calculation means is corrected so that the exposure value becomes lower than usual when the inside / outside determination means determines that the camera is outdoors. Control device. 5. An electronic flash device, an exposure value calculating means for calculating an exposure value according to the brightness of a subject, and a light emission control means for causing the electronic flash device to emit light when the brightness of the subject is equal to or less than a predetermined value. An indoor / outdoor determining means for determining whether the shooting environment is indoor or outdoor, a time detecting means for detecting a time of shooting, and a time obtained by the time detecting means. Determining means for determining whether or not the current time is based on twilight, based on whether the shooting environment is determined to be outdoor by the indoor / outdoor determining means, and determined to be during twilight by the determining means, Prohibiting means for prohibiting light emission of the electronic flash device in a twilight state by correcting the predetermined value of subject brightness. 6. An electronic flash device, an exposure value calculating means for calculating an exposure value in accordance with the brightness of a subject, and a light emission control means for causing the electronic flash device to emit light when the brightness of the subject is equal to or less than a predetermined value. An indoor / outdoor determining means for determining whether the shooting environment is indoors or outdoors, a time detecting means for detecting a time of shooting, and detecting a date of shooting. Date detecting means, geographic information inputting means for inputting geographic information, sunrise and sunset detecting sunrise time and sunrise time based on the detected date and the input geographic information Detecting means; determining means for determining whether or not the current time is twilight based on the time detected by the time detecting means and the sunrise time and the sunset time detected by the sunrise / sunset detecting means. And the indoor / outdoor determination means Prohibition means for prohibiting light emission of the electronic flash device in a twilight situation by correcting the predetermined value of the subject brightness when it is determined that the subject is outdoors and when the determination means determines that it is twilight. An exposure control device for a camera. 7. The apparatus according to claim 1, further comprising a distance measuring means for measuring a subject distance, wherein said light emission control means causes said electronic flash device to emit light when said measured subject distance is a short distance. Item 7. An exposure control device for a camera according to item 5 or 6. 8. The indoor / outdoor determining means analyzes a color temperature of a light source in the shooting environment to determine whether the shooting environment is indoor.
Claim 1, 2, 4, characterized in that it is determined whether it is outdoors
7. Exposure control means for a camera according to 5 or 6. 9. The indoor / outdoor determining means analyzes the frequency of a light source in the shooting environment to determine whether the shooting environment is indoors or not.
Claim 1, 2, 4, characterized in that it is determined whether it is outdoors
7. Exposure control means for a camera according to 5 or 6.