KR19980034997A - Automatic red-eye reduction of the camera and its control method - Google Patents

Abstract

The present invention relates to an apparatus for automatically preventing red eye of a camera and a method of controlling the same, comprising: distance sensing means for determining a focal length from a subject by using an output current that changes according to a distance from the subject; Brightness sensing means for determining a brightness state of the shooting environment by using a voltage value varying according to the degree of brightness around the subject so that proper shooting operation according to the brightness state can be performed; The focal length and luminance degree of the subject are determined by using the signals output from the distance detecting means and the luminance detecting means, and when the determined focal length and the luminance intensity satisfy the set conditions, the red-eye phenomenon of the camera is automatically determined. Camera control means for switching to a preventable mode so that the flash 4 can be preliminarily fired, and outputting a control signal for performing a photographing operation of the subject; And a flash control means connected to the camera control means to change the operation state according to a control signal output from the camera control means to pre-flash the flash 4 and to execute a light emission operation for photographing a subject. In addition, it is possible to prevent the camera's red eye without attaching a separate switching device for switching the camera's shooting mode, thereby reducing spatial constraints in the design of the camera. By switching to the red-eye reduction mode, the user's convenience can be achieved, and a red-eye effect due to the carelessness of the photographer can be prevented and a good picture can be obtained.

Description

Camera red eye automatic prevention device and control method

The present invention relates to a device for automatically preventing red-eye phenomenon and a control method thereof, and in particular, according to a focal length and luminance state of a subject without adding a separate device for preventing red-eye that may occur during shooting. The present invention relates to a control method of an automatic red-eye prevention apparatus of a camera, which is switched to a shooting mode that can prevent red-eye, so that a subject can be photographed.

When taking a picture, it is influenced by the illumination of the surrounding environment, so when taking a picture indoors or at night when the illumination is very low, create a flash for an extremely short period of time, which has almost the same characteristics as the sun beam with a large amount of light and a high color temperature. In addition, the quality of a photograph is prevented from being deteriorated by the ambient illumination at the time of photography.

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.

Therefore, xenon discharge tubes that produce flashes, or flashes, are used. These discharge tubes require high-voltage power, while cameras are usually portable, so they must use light weight batteries for power supply. I'm using. In other words, batteries, transformers, and xenon discharge tubes are used as the basic components of flash devices with various modifications depending on the design.

This kind of flash device is configured such that the circuit is operated at the same time as the shutter is pressed to emit a constant amount of flash.

When the low luminance flash is photographed by emitting light, a red-eye phenomenon occurs in which the red light is reflected by blood vessels in the eye when the optical axis of the flash light source enters the eye through the pupil.

Therefore, in order to prevent the red-eye phenomenon, the irradiation angle between the island and the light source is dropped from the lens optical axis, or the enlarged pupil by using preliminary light emission is reduced to a small size by using a sudden flash so that photography can be performed.

As described above, in order to prevent red-eye phenomenon that occurs when photographing a subject at night or in a dark place, a separate red-eye prevention device is additionally installed in the camera.

Therefore, when photographing a subject, the photographer arbitrarily selects an additionally installed red-eye reduction device to switch the camera's shooting mode to the red-eye reduction mode.

By the control device controlling the photographing operation of the camera, preliminary light emission is executed before the main photographing of the subject is performed to reduce the enlarged pupil when the main photographing is executed to prevent the red-eye phenomenon.

However, the prior art for preventing red eye through the above operation should be equipped with a separate red eye prevention device for changing the shooting state of the camera to the red eye prevention state.

Therefore, in the camera of the miniaturization trend, additional devices must be additionally installed, which causes a lot of difficulties in design due to space constraints and a problem of cost increase.

In addition, since the preliminary flash is controlled to prevent the red eye by the person who judges, the preliminary flash operation may be performed even when the red eye does not occur due to the misjudgment of the photographer. Unnecessary consumption.

On the contrary, even when the red-eye phenomenon is not switched to a mode in which the camera's shooting mode is prevented from occurring, the red-eye phenomenon occurs and damages the photographed picture.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and automatically adjusts the camera according to the focal length of the subject and the luminance state of the surroundings without a separate device for switching the camera's shooting mode to the red-eye reduction mode. An object of the present invention is to provide an apparatus for automatically preventing red eye of a camera and a method of controlling the same, by switching a photographing state to a red eye preventing mode so that a photographing operation of a subject can be performed.

Another object of the present invention is to prevent the camera from inadvertently switching the camera's shooting mode to a mode in which the photographer's carelessness is prevented in a camera configured to prevent the red-eye phenomenon that may occur by manually switching the camera's shooting mode. The present invention also provides an apparatus for automatically preventing red eye of a camera and a method of controlling the same, which automatically switch a shooting mode of the camera to a red eye prevention mode to execute a safe shooting operation.

1 is a block diagram of a device for automatically preventing red eye of a camera according to an exemplary embodiment of the present invention;

2 is a flowchart illustrating a method of controlling red eye of a camera according to an exemplary embodiment of the present invention.

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

Distance sensing means for determining a focal length with respect to the subject by using an output current which changes according to the distance to the subject;

Brightness sensing means for determining a brightness state of the photographing environment by using a voltage value that changes according to the degree of brightness around the subject so that proper photographing operation can be performed according to the brightness state;

Connected to the distance detecting means and the brightness detecting means, and determining a focal length and a degree of brightness with respect to a subject by using signals output from the distance detecting means and the brightness detecting means, Camera control means for automatically switching the shooting mode of the camera to a mode capable of preventing red-eye when the user is satisfied so that the flash can be preliminarily fired and outputting a control signal for the shooting operation of the subject;

And a flash control means connected to the camera control means to change the operation state according to a control signal output from the camera control means to pre-flash the flash and to execute a light emission operation for photographing a subject.

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

If the camera is equipped with a separate switching means for manually switching the camera's shooting mode to red-eye reduction mode,

Further comprising a switching means,

When the state of the switching means is not determined and the state is not switched to a condition for preventing red-eye, the focal length and luminance viscosity with the subject are determined using the signals output from the distance sensing means and the luminance sensing means, and the determined focus is determined. If the distance and brightness level are met, the camera automatically switches the shooting mode to a mode that prevents red-eye, allowing the flash to pre-flash, and then outputs a control signal that allows the shooting operation of the subject to take place. It is made to do it.

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

Determining a focal length with respect to the subject by reading a signal output from the distance detecting means;

Comparing the focal length with the determined distance with the determined subject and determining whether the focal length is less than or equal to the set distance;

When the determined focal length with respect to the subject is less than or equal to the set distance, determining a degree of luminance by reading a signal output from the luminance sensing means;

Comparing the determined luminance degree with the set luminance to determine whether the luminance degree is less than or equal to the set luminance;

When the determined luminance level is less than or equal to the set luminance, the camera switches the shooting mode to the red-eye reduction mode, outputs a control signal for controlling the operation of the flash control means to pre-flash the flash, and then photographs the subject. And photographing the subject when the focal length and luminance degree with respect to the subject do not satisfy the setting condition.

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

If the camera is equipped with a separate switching means for manually switching the camera's shooting mode to red-eye reduction mode,

Determining a state of the attached switching means;

If the determined switching state is not switched to a state for preventing red-eye, determining a focal length with the subject by reading a signal output from the distance detecting means;

Comparing the focal length with the determined distance with the determined subject and determining whether the focal length is less than or equal to the set distance;

When the determined focal length with respect to the subject is less than or equal to the set distance, determining a degree of luminance by reading a signal output from the luminance sensing means;

Comparing the determined luminance degree with the set luminance to determine whether the luminance degree is less than or equal to the set luminance;

When the determined luminance level is less than or equal to the set luminance, the camera switches the shooting mode to the red-eye reduction mode, outputs a control signal for controlling the operation of the flash control means to pre-flash the flash, and then photographs the subject. And photographing the subject when the focal length and luminance degree with respect to the subject do not satisfy the setting condition.

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 a device for automatically preventing red eye of a camera according to an exemplary embodiment of the present invention;

2 is an operation flowchart of a method for automatically controlling red eye of a camera according to an exemplary embodiment of the present invention.

Looking at the configuration of the present invention with reference to Figure 1,

A distance detecting unit 11 for determining a focal length with respect to the subject by using an output current that changes according to the distance to the subject;

A luminance sensor 12 which determines a luminance state of the shooting environment by using a voltage value that changes according to the degree of luminance around the subject so that an appropriate shooting operation according to the luminance state can be performed;

It is connected to the distance sensor 11 and the brightness sensor 12, and determines the focal length and brightness intensity with the subject by using the signals output from the distance sensor 11 and the brightness sensor 12 When the determined focal length and luminance degree satisfy the set conditions, the camera controller (2) automatically switches the shooting mode of the camera to a mode that prevents red-eye, and outputs a control signal for performing a shooting operation of the subject (2). )Wow,

A flash control unit 3 connected to the camera control unit 2 to change an operation state according to a control signal output from the camera control unit 2 so that a light emission operation can be performed;

An operation state is changed according to a zero signal output from the flash control unit 3, and the flash 4 performs preliminary light emission and a main light emission operation for red eye.

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, and the infrared rays reflected and incident as light sensing elements change in magnitude of the output current according to the incident position. consist of.

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

The operation of the present invention made as described above will be described with reference to FIG.

First, when 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 photographing switch attached to the camera is operated when the photographing subject is photographed in a standby state for photographing a subject while the power necessary for the operation is supplied as described above, the control as shown in FIG. 2 before the photographing operation is performed. By the operation, an operation for automatically preventing the red eye in accordance with the shooting conditions is executed.

Therefore, when the operation of the camera control unit 2 starts (S10), the camera control unit 2 reads the signal output from the distance detection unit 11 and measures the focal length with respect to the subject to be photographed (S11, S12). .

When the focal length with respect to the subject is determined by the above operation, the camera controller 2 compares the determined focal length with a predetermined set distance (S13).

Therefore, when the determined focal length state is shorter than the set distance, the camera controller 2 continues to perform a control operation that can automatically prevent red eye that may occur.

However, when the determined state of the focal length is longer than the set distance, the distance to the subject is set even if the pupil is enlarged by a sudden flash even when the flash 4 is operated to compensate for the lack of light generated during shooting. It is abnormal and does not cause red eye.

Therefore, without performing a control operation for automatically preventing red-eye, the process proceeds to step S19 to enter a shooting mode for shooting a subject in a state corresponding to a condition so that a normal shooting operation is performed.

In this case, the set distance is set to a distance at which the blood vessels of the pupil are not photographed even when the pupil of the flash 4 is enlarged.

When the state of the focal length determined in the step S13 is less than or equal to a set distance at which the enlarged pupil blood vessel can be photographed when the flash 4 is operated, the camera controller 2 outputs from the luminance detector 12. The signal to be read is read (S14), and the luminance level is determined (S15).

Then, the camera controller 2 compares the determined luminance degree with the set luminance state, and determines whether the set condition is satisfied (S16).

When the determined luminance degree satisfies the set condition, that is, when the determined luminance degree is higher than the set luminance degree, the flash state does not operate because the luminance state is a state in which a clear picture can be obtained without supplementing the amount of light using the flash 4. It is a state.

That is, since the red light phenomenon is not generated because the light emitting operation of the flash 4 is not performed, the operation state of the camera controller 2 is shifted to the shooting mode capable of executing a normal shooting operation (S19).

However, when the determined luminance degree satisfies the setting condition and is lower than or equal to the set luminance, the amount of light is insufficient to perform a normal photographing operation.

Therefore, when the flash 4 to compensate for the insufficient light suddenly operates, the pupil of the pupil is reduced, and the blood vessel of the pupil with the enlarged focal length can be photographed so that the shooting operation must be performed to prevent the red eye. .

Therefore, the camera controller 2 converts the camera's shooting mode into the red-eye reduction mode so that the flash 4 can be preliminarily fired before the photographing operation of the subject is performed (S17), and the flash controller 3 corresponds to the flash controller 3. The control signal is output (S18).

The flash control unit 3 is operated according to the control signal output from the camera control unit 2, and the preliminary flash operation of the flash unit 4 is performed at a light emission amount slightly smaller than that of the flash unit 4 that is emitted when the main image is taken. Make it work.

Therefore, since the preliminary flash of the flash 4 is performed before the photographing operation of the actual subject in which the flash 4 is operated as described above, the photographing operation can be performed. Can be prevented by

As described above, the red eye may be prevented without using a separate switching device for manually switching the photographing mode of the camera to the red eye prevention mode in order to prevent the red eye.

In addition, in order to prevent the red eye of the camera, the camera control unit 2 has a red eye in which the camera can manually switch the shooting mode to the red eye prevention mode to control the preliminary flash operation of the flash 4. The operation state of the separate switching device that can be switched to the development prevention mode is determined.

Therefore, when the determined operating state of the switching device is not a state for preventing red eye, the camera controller 2 executes the above-described control operation, and when the shooting condition may cause red eye, Irrespective of the red light phenomenon, the flash controller 3 controls the operation of the flash controller 3 so that the preliminary light emission of the flash 4 can be performed.

However, when the determined operation state of the switching device is a state for preventing red-eye, the control unit immediately proceeds to the normal shooting mode without performing the above-described control operation so as to control the shooting operation of the subject.

In order to prevent red-eye, the red-eye of the camera can be prevented without attaching a separate switching device for switching the shooting mode of the camera, thereby reducing spatial constraints in the camera design.

By automatically switching the camera's shooting mode to the red-eye reduction mode according to the subject's shooting conditions, the user's convenience can be achieved, and red-eye caused by the inadvertent of the photographer can be prevented to obtain a good picture.

Claims (8)

Distance sensing means for determining a focal length with respect to the subject by using an output current which changes according to the distance to the subject; Brightness sensing means for determining a brightness state of the shooting environment by using a voltage value varying according to the degree of brightness around the subject so that proper shooting operation according to the brightness state can be performed; Connected to the distance detecting means and the brightness detecting means, and determining a focal length and a brightness degree with respect to a subject by using signals output from the distance detecting means and the brightness detecting means, and determining a condition in which the determined focal length and brightness intensity are set. Camera control means for automatically switching the shooting mode of the camera to a mode that prevents red-eye, if it is satisfied, so that the flash 4 can be preliminarily fired, and then outputting a control signal for the shooting operation of the subject; ; And a flash control means connected to the camera control means to change the operation state according to a control signal output from the camera control means to pre-flash the flash 4 and to execute a light emission operation for photographing a subject. The red-eye automatic prevention device of the camera, characterized in that. The method according to claim 1, wherein the distance detecting means, An infrared light emitting unit for reflecting infrared rays and an infrared light receiving unit for receiving reflected infrared rays, the output current of the reflected infrared light is changed according to the position of incidence is composed of a photosensitive device of the camera Automatic red eye prevention. The method according to claim 1, wherein the brightness sensing means, An automatic red-eye reduction apparatus for a camera, comprising a Cds photoconductive cell in which a magnitude of an internal electric resistance value is converted according to an irradiation amount of light to be irradiated so that an output current is changed. If the camera is equipped with a separate switching means for manually switching the camera's shooting mode to red-eye reduction mode, Switching means; Distance sensing means for determining a focal length from the subject by using the output current converted according to the distance from the subject; Brightness sensing means for determining a brightness state of the shooting environment by using a value of a current which varies according to the degree of brightness around the subject so that proper shooting operation according to the brightness state can be performed; And a signal output from the distance sensing means and the luminance sensing means when the state of the attached switching means is not determined and the state of the attached switching means is not switched to the state for preventing the red-eye phenomenon. Determining the focal length and luminance degree with a subject, and if the determined focal length and luminance degree satisfy the set conditions, the flash 4 automatically switches the shooting mode of the camera to a mode that can prevent red-eye. Camera control means for outputting a control signal to enable preliminary light emission and to perform photographing operation of the subject; And a flash control means connected to the camera control means to change the operation state according to a control signal output from the camera control means to pre-flash the flash 4 and to execute a light emission operation for photographing a subject. The red-eye automatic prevention device of the camera, characterized in that. Determining a focal length with respect to the subject by reading a signal output from the distance detecting means; Comparing the focal length with the determined distance with the determined subject and determining whether the focal length is less than or equal to the set distance; When the determined focal length with respect to the subject is less than or equal to the set distance, determining a degree of luminance by reading a signal output from the luminance sensing means; Comparing the determined luminance degree with the set luminance to determine whether the luminance degree is less than or equal to the set luminance; When the determined luminance degree is less than or equal to the set luminance, after switching the shooting mode of the camera to the red-eye reduction mode, after outputting a control signal for controlling the operation of the flash control means so that preliminary flash of the flash 4 can be performed, And photographing the subject, and photographing the subject when the focal length and luminance degree with the subject do not satisfy the set condition. The method according to claim 5, wherein the set distance, When the pupil is enlarged by the operation of the flash (4) is set to the distance that the blood vessels of the eyes are not photographed automatic control of red eyes. If the camera is equipped with a separate switching means for manually switching the camera's shooting mode to red-eye reduction mode, Determining a state of the attached switching means; If the determined switching state is not switched to the state for preventing red-eye, determining a focal length with the subject by reading a signal output from the distance detecting means; Comparing the focal length with the determined distance with the determined subject and determining whether the focal length is less than or equal to the set distance; When the determined focal length with respect to the subject is less than or equal to the set distance, determining a degree of luminance by reading a signal output from the luminance sensing means; Comparing the determined luminance degree with the set luminance to determine whether the luminance degree is less than or equal to the set luminance; When the determined luminance degree is less than or equal to the set luminance, after switching the shooting mode of the camera to the red-eye reduction mode, after outputting a control signal for controlling the operation of the flash control means so that preliminary flash of the flash 4 can be performed, And photographing the subject, and photographing the subject when the focal length and luminance degree with the subject do not satisfy the set condition. The method according to claim 7, wherein the set distance, A method of controlling automatic red-eye of a camera, characterized in that the flash (4) is set to a distance at which the blood vessels of the eyes are not photographed even when the pupil is enlarged.