KR100771945B1 - apparatus for preventing the red eye development of photographing apparatus and control method thereof - Google Patents

Abstract

The present invention relates to an apparatus for preventing red eye of a photographing apparatus and a control method thereof. According to the present invention, the luminance of the photographing environment is determined by using a distance detecting unit for determining a focal length with respect to a subject by using an output current that changes according to a distance from the subject, and a voltage value that varies according to the degree of luminance around the subject. A luminance detector for determining a state and allowing proper shooting operation according to the luminance state, a light emitting diode which is preliminarily emitted to prevent red-eye according to an applied control signal, a distance detector, a luminance detector, and a light emission It includes an operation control unit connected to the diode. The operation control unit performs the ranging and metering operations according to the signals applied from the distance sensing unit and the luminance sensing unit. If the measured ambient luminance does not reach the set luminance value, the charging operation for light emission is performed according to the applied detection signal. It is determined whether the charging operation has been completed, and if the charging voltage has not been completed, it is determined whether the charging voltage has reached the set voltage. This flash fires to shoot the subject. In addition, the present invention executes the charging operation for the light emission operation according to the control signal applied from the operation control unit, outputs a detection signal according to the charging detection state to the operation control unit, photographing the subject according to the light emission control signal applied from the operation control unit It includes a flash unit for performing a light emitting operation for.

 Camera, shooting device, red eye, preliminary light emission

Description

Apparatus for preventing the red eye development of photographing apparatus and control method

1 is a block diagram of an apparatus for preventing red eye of a camera according to an exemplary embodiment of the present invention.

2A and 2B are flowcharts illustrating a method of controlling red eye of a camera according to an exemplary embodiment of the present invention.

The present invention relates to a device for preventing red-eye phenomenon of a photographing apparatus and a control method thereof, and more particularly, even if a charging state of a charging device operating to prevent red-eye is not completed, even when a certain voltage is higher than a predetermined voltage. A red eye prevention apparatus of a photographing apparatus which performs preliminary light emission for preventing, and its control method.

When taking a picture, it is affected by the illumination of the surrounding environment. Therefore, when taking a picture indoors or at night when the illumination is very low, a flash of light having almost the same characteristics as the sun beam having a large amount of light and a high color temperature for a very short time is taken. When the picture is taken, the quality of the picture is prevented from being degraded by the ambient light.

In order to perform the above operation, the camera should be provided with a flash device, and the flash device should be instantaneously flashed in conjunction with the shutter.

In the case where the flash device emits light at low luminance and photographs, a red-eye phenomenon occurs in which the red light is reflected by blood vessels in the eye when the optical axis of the scintillation light source enters the eye through the pupil.

Therefore, in order to prevent such a red-eye phenomenon, the main shooting can be performed after a small reduction of the pupil enlarged by a sudden flash using preliminary light or the like.

As described above, as one of the conventional techniques for preventing red eyes occurring when photographing a subject at night or in a dark place, a separate red eye preventing light emitting device, that is, a light emitting diode (LED) or a lamp device is additionally installed.

Therefore, when photographing a subject, the red-eye removal device installed separately is preliminarily fired to reduce the enlarged pupil before the subject is actually photographed, and then the flash unit using the mounted xenon tube or the like is executed to perform the red eye phenomenon. To prevent this.

When the red-eye phenomenon is prevented by using a light emitting diode or a lamp, which is a red-eye preventing light emitting device, the red-eye phenomenon may be reduced by increasing the light emission luminance of the light emitting diode or the lamp or adjusting the light emission time appropriately.

However, the method of increasing the luminous brightness generates a limit of parts and increases the manufacturing cost, and generally, red-eye phenomenon is reduced by appropriately adjusting the luminous time. In order to improve the red eye effect, the light emission time is increased to an appropriate level. However, since the light emission time is closely influenced by the shooting time or the shooting time of the camera, it is impossible to capture a desired scene during actual shooting.

In general, during red-eye photography using light emitting diodes, the shutter switch is activated when the main capacitor for emitting light emitting diodes is being charged.

Since it is not small, no preliminary light emission is performed to reduce the red-eye phenomenon.

Therefore, in the situation where the preliminary light emission time for red-eye is set long, preliminary light emission is not performed to reduce the red-eye effect until the charging of the main capacitor is completed. Therefore, the desired scene may be affected by affecting the actual shooting time. You cannot shoot.

Therefore, an object of the present invention is to enable the red-eye light emitting device to be pre-lighted when the main capacitor for the operation of the red-eye light emitting device to prevent red-eye does not complete the charge or more than a certain voltage and the charging of the main capacitor The present invention is to provide an apparatus for preventing red eye of a photographing apparatus and a control method thereof to shorten a photographing time by performing main light emission for photographing a subject.

The configuration of the present invention for achieving the above object, the distance detection means for determining the focal length with the subject by using the output current that changes according to the distance to the subject,

Luminance sensing means for determining the luminance state of the shooting environment by using a voltage value that changes in accordance with the degree of luminance around the subject, and to enable proper shooting operation according to the luminance state,

Red-eye prevention light emitting means which is preliminarily emitted to prevent red-eye according to an applied control signal;

In the case of performing the ranging and metering operations according to the signals applied from the distance sensing means and the luminance sensing means, and if the measured ambient luminance does not reach the set luminance value, the charging operation for light emission is completed according to the applied detection signal. If the charging operation is not completed, it is determined whether the charging voltage has reached the set voltage, and when the charging voltage is reached, the preliminary light emission of the red-eye preventing light emitting means is executed for a set time, and the charging operation is completed. Operation control means for executing this light emission for photographing a subject, and

Perform a charging operation for the light emission operation according to the control signal applied from the operation control unit, output a detection signal according to the charging detection state to the operation control means, and photograph the subject according to the emission control signal applied from the operation control means. It consists of flash means for performing a light emission operation.

Another configuration of the present invention for achieving the above object,

Reading signals output from the distance sensing means and the brightness sensing means to determine a focal length and ambient luminance with the subject;                     

Determining whether the determined ambient luminance is less than or equal to the set luminance value;

Determining the state of charge of the main capacitor of the flash unit when the determined ambient luminance is less than or equal to the set luminance value;

Determining whether the charging voltage of the main capacitor is greater than or equal to a set voltage when the determined charging state of the main capacitor is not completed;

Preliminarily emitting red-eye preventing light emitting means for a predetermined time when the charging voltage of the main capacitor is equal to or greater than a predetermined voltage;

When the charging of the main capacitor is completed, the step of preliminarily emitting the red-eye prevention light emitting means.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an apparatus for preventing red eye of a camera according to an exemplary embodiment of the present invention, and FIGS. 2A and 2B are flowcharts illustrating an operation of a method for controlling red eye of a camera according to an exemplary embodiment of the present invention.

Referring to the configuration of the present invention with reference to Figure 1, the distance detection unit 11 to determine the focal length with respect to the subject using the output current changes according to the distance to the subject, and the degree of brightness around the subject A luminance detector 12 which determines a luminance state of the shooting environment using a voltage value that changes according to the target and a proper shooting operation according to the luminance state, and a release to measure the distance and luminance from the subject. One-stage switch (S1), a two-stage release switch (S2) for executing the shooting operation of the subject, a flash mode selection switch (S3) for selecting a red-eye emission mode among various flash modes, and detecting these distances Unit 11, brightness detection unit 12, release 1 stage and release 2 stage switches (S1, S2), flash mode selection switch (S3), the operation of the release 1 stage switch (S1) According to the signal output from the distance sensor 11 and the brightness sensor 12 to determine the focal length and the brightness level with the subject, if the determined focal length and the brightness degree satisfies the set conditions, select the flash mode An operation control unit 2 for outputting a control signal for switching the shooting mode of the camera to the red-eye reduction mode that can prevent red-eye, according to the selected state of the switch S3, so that the shooting operation of the subject can be performed; A light emitting diode LED1 connected to the operation control unit 2 and preliminarily emitting light to prevent red-eye according to a control signal output from the operation control unit 2, and between the light emitting diode LED1 and the operation control unit 2. A resistor R1 for controlling current flowing through the light emitting diode LED1 and a control signal connected to the operation control unit 2 and output from the operation control unit 2. It is composed of a flash unit (3) to change the operation state so that the present light emission operation for taking a subject.

The distance detecting unit 11 includes an infrared light emitting unit for emitting infrared rays and an infrared light receiving unit for receiving reflected infrared rays, such as a light sensing element for changing the magnitude of the output current according to the incident position of the reflected infrared rays. consist of.

The luminance detector 12 includes a Cds sulfide photoconductive cell in which the magnitude of the internal electrical resistance value is changed according to the irradiation amount of the irradiated light and the output voltage is changed.

The flash unit 3 is connected to the oscillation signal control terminal A of the operation control unit 2 and an oscillation unit 31 for executing an oscillation operation for emitting light according to a control signal output from the operation control unit 2, and the oscillation unit A charge detector 32 connected to the charge detection control terminal B of the operation controller 2 and the charge detector 32 for detecting a charge state, and a charger connected to the charge detector 32 and connected to the main capacitor C. Light emitted by the xenon tube CT connected to the charging unit 33 and the light emission control terminal C of the operation controller 2 and connected according to a control signal of the operation controller 2. It consists of a part (34).

The operation of the present invention thus constructed will be described with reference to FIGS. 2A and 2B.

First, when the power required for the operation of each device is supplied, it becomes an operable state and can perform the photographing operation of the subject.

When the shooting switch (release 1 stage and release 2 stage switches) attached to the camera is activated for shooting a subject while the shooting standby state where the subject can be taken while the power necessary for the operation is supplied is performed, this shooting Before the operation is performed, an operation for automatically preventing the red eye in accordance with the shooting condition is performed by the control operation as shown in FIG. 2A.

When the operation of the operation control unit 2 is started (S10), the operation control unit 2 reads the signal input from the flash mode selection switch S3 so that the flash mode selection switch S3 is selected by the user. In this case, the red-eye emission mode is selected (S11) to control the operation state of the camera, and when the flash mode selection switch S3 is not selected, the normal shooting mode is selected to operate.

When the shooting mode of the camera is selected as the red eye emission mode, the operation control unit 2 determines the operation state of the release first stage switch S1 (S12). When the release first stage switch S1 is not operated, the operation control unit 2 continuously determines the operation state of the release first stage switch S1.

When the release first stage switch S2 is operated, the operation control unit 2 reads a signal output from the distance detection unit 11 and the luminance detection unit 12 to detect a focal length and a surrounding luminance state of a subject to be photographed. In operation S13, a focal length with respect to the subject and a degree of ambient luminance are calculated.

Then, the operation control unit 2 determines the calculated ambient luminance degree (S14) to determine whether the flash unit 4 emits light. When the calculated ambient luminance degree is higher than the set value, the operation controller 2 determines the state of the release two-stage switch S2 for photographing the subject because the operation of the flash unit 3 to compensate for the insufficient ambient luminance is unnecessary. (S15).

When the release two-stage switch S2 is in the on state, the operation control unit 2 terminates the operation after performing subject photographing (S100), and continues if the release two-stage switch S2 is not in the on state. The operation state of the release two-stage switch S2 is determined.

However, in step S14, when the determined ambient luminance degree is not higher than the set value, the operation control unit 2 controls the preliminary light emission for operating the light emitting diode LED1 before the flash unit 3 emits light.

Therefore, the operation control unit 2 outputs a control signal to the oscillation unit 31 of the flash unit 3 so that the charging operation of the charging unit 33 can be performed, and is then output from the charging detection unit 32 to charge detection control terminal ( The charging state of the main capacitor C of the charging unit 33 is determined using the control signal applied to B) (S17).

When it is determined that the charging of the main capacitor C is completed, the operation control unit 2 determines the operation state of the release two-stage switch S2 (S18). When the release two-stage switch S2 is not in the operating state, when the operation state of the release two-stage switch S2 is determined and it is determined that the release two-stage switch S2 is operated, the operation control unit 2 red-eyes it. In order to prevent the phenomenon, the light emitting diode LED1 is emitted (S19) to perform preliminary light emission. Then, the control signal is output to the light emission control terminal C to operate the xenon tube CT connected to the light emission unit 34 of the flash unit 3 to execute the present light emission 20 (S20), After photographing the subject (S100), the operation ends.

However, when it is determined that the state of charge of the main capacitor C determined in step S17 is not completed, the operation controller 2 determines whether the main capacitor C is charged to a threshold voltage for red-eye light emission (S22). . In this embodiment, the threshold voltage is set to about 100V. This is because the current consumption of the light emitting diode LED1 to prevent red eye is about 20 to 40 mA and the flash charging current is about 5 A at the start of charging, so that a load is generated in the circuit when the light emitting diode LED1 is turned on. Therefore, an error may occur in the operation of the camera control circuit, and an abnormal operation may occur because the driving voltage of the control device decreases momentarily.

When the state of charge of the main capacitor C does not reach the set threshold voltage, the operation control unit 2 determines whether the release first stage switch S1 is on (S23).

When the release first stage switch S1 is not turned on, the operation controller 2 returns to the initial state (S200) and waits for photographing the subject. However, when the release first stage switch S1 is still in the ON state, the operation controller 2 checks the charging voltage of the main capacitor C (S24) and determines whether the set threshold voltage has been reached (S25).

Then, when the set threshold voltage is reached, the operation control unit 2 determines the operation state of the release first stage switch S1 (S26), and when the release first stage switch S1 is on, the light emitting diode LED1 After the light is emitted, the light emitting time is checked by operating a timer built in the camera or a programmatically designed timer (not shown) (S27).

Then, the operation control unit 2 determines the operation state of the release two-stage switch (S2) (S28), when the release two-stage switch (S2) is on, a detection signal applied through the charge detection control terminal (B) In accordance with the determination of the state of charge of the main capacitor (C) (S30).

When it is determined that the state of charge of the main capacitor C is completed, the operation control unit 2 operates the light emitting unit 34 of the flash unit 33 to execute the main light for photographing a subject (S20). Subject shooting is performed (S100).

However, when the charging of the main capacitor C is not completed, the operation control unit 2 continues to determine the charging state of the main capacitor C. FIG.

If the operation state of the release two-stage switch S2 determined in step S28 is not on, the operation control unit 2 checks the red eye prevention light emission time to determine whether the set red eye light emission time is completed (S29).

When the set red-eye emission time elapses, the operation control unit 2 determines that the user is not willing to photograph the subject, and returns to the initial state (S200). When the set time is not reached, the light emitting diode (LED1) continues to emit light. It is determined whether the time has elapsed with the set red eye emission time (S29).

However, in step S25, when the determined charging voltage is lower than the set threshold voltage, the charging voltage state is continuously determined.

In addition, when the state of the release first-stage switch S1 determined in steps S23 and S26 is not on (S200), the process returns to the initial state (S200) and waits for photographing the subject.

However, when the state of charge of the main capacitor C determined in step S22 reaches the set threshold voltage, the operation control unit 2 checks the state of the release first stage switch S1 and continues to release the first stage switch S1. It is determined whether) is on (S31).

When the release first stage switch S1 is not in the on state, the operation controller 2 determines that the user does not have a willingness to photograph, and returns to the initial stage (S200).

Therefore, when the release first stage switch S1 is turned on, the operation controller 2 performs an operation after step S27 described above, and preliminarily emits the light emitting diode LED1 to prevent red-eye for a predetermined time.

By this operation, even when the charging of the main capacitor for red-eye prevention is not completed, preliminary flash for red-eye prevention is performed, and when the charging of the main capacitor is completed, the main flash for subject shooting can be performed immediately. By shortening the shooting time of the subject, the shooting of the desired subject can be performed.

Claims (7)

Distance sensing means for determining a focal length from the subject by using an output current that changes according to the distance from the subject, Luminance sensing means for determining the luminance state of the shooting environment by using a voltage value that changes in accordance with the degree of luminance around the subject, and to enable proper shooting operation according to the luminance state, Red-eye prevention light emitting means which is preliminarily emitted to prevent red-eye according to an applied control signal; In the case of performing the ranging and metering operations according to the signals applied from the distance sensing means and the luminance sensing means, and if the measured ambient luminance does not reach the set luminance value, the charging operation for light emission is completed according to the applied detection signal. If the charging operation is not completed, it is determined whether the charging voltage has reached the set voltage, and when the charging voltage is reached, the preliminary light emission of the red-eye preventing light emitting means is executed for a set time, and the charging operation is completed. Operation control means for executing this light emission for photographing a subject, and A charging operation for a light emission operation is performed according to a control signal applied from the operation control means, a detection signal according to a charging detection state is output to the operation control means, and a subject according to a light emission control signal applied from the operation control means Flash means for executing a light-emitting operation for shooting Red-eye reduction device of the photographing device consisting of. The method of claim 1, Red-eye reduction apparatus for the photographing apparatus further including a flash mode selection switch for selecting a red-eye emission mode. The method of claim 1, First photographing switch means for measuring a distance from the subject and brightness, and A second photographing switch means for executing a photographing operation of the subject, And the operation controller returns to a photographing standby state when the first photographing switch does not operate when the charging voltage reaches the set voltage. The method according to claim 1 or 3, And the operation control unit preliminarily emits the red-eye preventing light emitting means after the charging operation is completed, and returns to the shooting standby state when the second photographing switch is not operated. Reading signals output from the distance sensing means and the brightness sensing means to determine a focal length and ambient luminance with the subject; Determining whether the determined ambient luminance is less than or equal to the set luminance value; Determining the state of charge of the main capacitor of the flash unit when the determined ambient luminance is less than or equal to the set luminance value; Determining whether the charging voltage of the main capacitor is greater than or equal to a set voltage when the determined charging state of the main capacitor is not completed; Preliminarily emitting red-eye preventing light emitting means for a predetermined time when the charging voltage of the main capacitor is equal to or greater than a predetermined voltage; Pre-lighting the red-eye preventing light emitting means when the charging of the main capacitor is completed Red eye control method of the camera consisting of. The method of claim 5, Determining whether the first photographing switch is operated when the charging voltage of the main capacitor is greater than or equal to the set voltage; And returning to a standby state when the first photographing switch is not operated. The method of claim 5, Determining an operating state of a second photographing switch when the charging of the main capacitor is completed; And returning to a shooting standby state when the second photographing switch is inoperative.

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