KR20110071562A - Apparatus and method for digital picturing image - Google Patents

Abstract

PURPOSE: A digital image processing apparatus and a control method thereof are provided to minimize an unnecessary power loss. CONSTITUTION: A detection unit(160) is arranged in one side of a view finder. The detection unit includes a lighting emitting portion and a light receiving portion. The lighting emitting portion omits the light. The light receiving portion receives the light reflected from a photographer. A controller(141) controls power supply to a display unit on the basis of am output value outputted in the detection unit. According to the light reflexibility of the photographer, the controller controls the maximum recognition distance of the detection unit.

Description

Digital image processing apparatus and control method thereof {Apparatus and method for digital picturing image}

The present invention relates to a digital image processing apparatus and a control method thereof, and more particularly, to a digital image processing apparatus and a control method thereof in which unnecessary power loss is minimized.

In recent years, digital single lens reflex (DSLR) cameras capable of taking professional photographs have been widely used. Here, the single-lens reflex type means to send an object to the viewfinder through a single lens or to send a light to a sensor for taking a picture.

In such a conventional single-lens reflex camera, a mirror is formed on the optical axis of the lens so as to be rotatable within a predetermined angle about the axis. Normally, the subject light obtained by the lens unit is reflected by the mirror and formed in the focus plate, so that the photographer can check the image of the subject formed in the focus plate by using the pentaprism and the viewfinder. At this time, when the shutter-release signal is input, the mirror is driven to rotate within the predetermined range about the axis to rise from the optical axis, and when the shutter is opened by the drive control of the shutter driving circuit, the imaging device An image of the subject is formed on the image.

Some of such conventional digital single-lens reflex cameras have been applied with an eye sensor. In detail, a digital single-lens reflex camera is generally provided with a display unit such as an LCD to check the captured image and to implement a live-view function. This is consumed. Therefore, if the display unit is turned on while the photographer is checking the subject through the viewfinder, unnecessary power is consumed. In order to solve such a problem, some of the conventional digital single-lens reflex cameras apply an eye sensor around the viewfinder, and automatically turn off the display unit when a photographer is detected within a certain distance from the viewfinder. This prevents unnecessary power consumption.

An object of the present invention is to provide a digital image processing apparatus and a control method thereof in which unnecessary power loss is minimized.

According to an aspect of the present invention, there is provided a digital image processing apparatus including a view finder for observing a subject and a display unit in which an image is electrically implemented, the light emitter being disposed on one side of the view finder and emitting light; A detector including a light receiver configured to receive the light reflected by the detector; And a controller configured to control whether to supply power to the display based on an output value output from the detector, wherein the controller adjusts a maximum recognition distance of the detector according to the light reflectance of the photographer. Provide a processing device.

In the present invention, the controller may reduce the maximum recognition distance of the detector if the light reflectance of the photographer is greater than a reference reflectivity, and increase the maximum recognition distance of the detector if the light reflectance of the photographer is less than a reference reflectance. have.

In the present invention, the control unit may adjust the maximum recognition distance of the detection unit by adjusting the light divergence time of the light emitting unit.

The controller may reduce the amount of light emitted from the light emitter if the light reflectance of the photographer is greater than a reference reflectance, and increase the amount of light emitted from the light emitter if the light reflectance of the photographer is less than a reference reflectance. .

Here, the controller compares the output value V _eye output from the detection unit with a predetermined reference value V _ref , and if the output value is larger than the predetermined reference value, increases the amount of light emitted from the light emitting unit, and outputs the output value. When the value is smaller than the predetermined reference value, the amount of light emitted from the light emitting part may be reduced.

Here, the controller may adjust the light divergence time of the light emitting part by adjusting the number of pulses of the light emitting part or the duty ratio of the pulse or the frequency of the pulse.

Here, the controller may increase the light divergence time of the light emitting part by increasing the number of pulses of the light emitting part, increasing the duty ratio of the pulse, or shortening the frequency of the pulses.

Here, the controller may reduce the light divergence time of the light emitting part by reducing the number of pulses of the light emitting part, reducing the duty ratio of the pulse, or increasing the frequency of the pulse.

In the present invention, when it is determined that the photographer exists within a predetermined distance from the digital image processing apparatus, the controller may cut off the power supplied to the display unit.

According to another aspect of the present invention, there is provided a control method of a digital image processing apparatus including a viewfinder for a photographer to observe a subject and a display unit on which an image is electrically implemented, the output value V _{eye of the} detector and a predetermined reference value ( V _ref ); Reducing the maximum recognition distance of the digital image processing apparatus when the output value V _eye of the detector is smaller than a predetermined reference value V _ref ; Increasing the maximum recognition distance of the digital image processing apparatus when the output value V _eye of the detector is greater than a predetermined reference value V _ref ; And storing the reduced or increased maximum recognition distance value.

In the present invention, in the step of comparing the output value (V _eye ) of the detector with a predetermined reference value (V _ref ), if the light reflectance of the photographer is greater than the reference reflectance, the output value (V _eye ) of the detector is a predetermined reference value (V _ref). Less than) and the light reflectance of the photographer is smaller than the reference reflectance, the output value V _eye of the detector may be greater than the predetermined reference value V _ref .

In the present invention, the detection unit may include a light emitting unit for emitting light and a light receiving unit for receiving the light reflected by the photographer.

The increasing and / or decreasing the maximum recognition distance of the digital image processing apparatus may be performed by adjusting the light divergence time of the light emitting unit.

Here, in the increasing and / or decreasing the maximum recognition distance of the digital image processing apparatus, when the light reflectance of the photographer is greater than a reference reflectance, the maximum recognition distance is reduced by reducing the amount of light emitted from the light emitting unit. When the light reflectance of the photographer is smaller than the reference reflectance, the maximum recognition distance may be increased by increasing the amount of light emitted from the light emitting unit.

The reducing of the maximum recognition distance of the digital image processing apparatus may be performed by reducing the number of pulses of the light emitting unit, reducing the duty ratio of the pulse, or increasing the frequency of the pulse.

The increasing of the maximum recognition distance of the digital image processing apparatus may be performed by increasing the number of pulses of the light emitting unit, increasing the duty ratio of the pulses, or shortening the frequency of the pulses.

In the present invention, after the steps, if it is determined that the photographer exists within a certain distance from the digital image processing device, the step of cutting off the power supplied to the display unit may be further included.

According to the present invention as described above, an effect of minimizing unnecessary power loss can be obtained.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a view showing the front appearance of a digital image processing apparatus according to the present invention.

Referring to FIG. 1, a shutter-release button 111, a mode dial 113, and a lens unit 120 are provided in front of the digital image processing apparatus 100.

The shutter-release button 111 of the digital image processing apparatus 100 opens and closes to expose an image capturing element (eg, CCD or COMS) to light for a predetermined time, and works in conjunction with an aperture (not shown). Record the image on the image acquisition device by properly exposing.

The shutter-release button 111 generates first and second image capturing signals by a photographer input. When the first image capturing signal as the half shutter signal is input, the digital image processing apparatus 100 focuses and adjusts the amount of light. When focus is achieved by the input of the first image capturing signal and the amount of light is adjusted, the second image capturing signal as a full shutter signal is input to capture an image.

The mode dial 113 is input for the shooting mode selection. In the digital image processing apparatus 100, the mode dial 113 has an optimum mode according to the AUTO (automatic shooting) mode, a shooting situation, or a subject state, which is used to minimize user settings and to record images quickly and easily according to a purpose of use. A / E is used to record images by manually setting various functions including the EFFECT mode, the aperture and the shutter speed, which are used to give special effects to the video shooting such as the SCENE mode, continuous shooting or scene shooting. It supports S / M mode and the like, and is not limited to the above modes.

The lens unit 120 receives light from an external light source and processes an image.

2 is a diagram illustrating an outer appearance of a digital image processing apparatus according to the present invention.

Referring to FIG. 2, the rear of the digital image processing apparatus 100 has a view finder 133, a wide angle zoom button 119w, a telephoto zoom button 119t, a function button. There is a cotton 115 and a display 117.

In the digital image processing apparatus 100, the view finder 133 is a small window for setting a composition by looking at a subject to be photographed.

The wide-angle zoom button 119w or the tele-zoom button 119t may have a wider angle of view or a narrower angle of view depending on an input. In particular, the wide-zoom button 119w or telephoto-zoom button 119t may be input when the size of the selected exposure area is changed. When the wide-zoom button 119w is input, the size of the selected exposure area is reduced, and when the tele-zoom button 119t is input, the size of the selected exposure area is increased.

The function button 115 includes a total of five buttons including an up button, a down button, a left button, a right button and a menu / OK button. The function button 115 is input to execute various menus related to the operation of the digital image processing apparatus 100. Each of the keys may also be used as a shortcut key, and the function button 115 may vary according to each manufacturer.

Although not shown in FIG. 2, a detector including a light emitting unit and a light receiving unit may be further provided on a rear surface of the digital image processing apparatus according to the present invention. Such a detection unit will be described in detail later with reference to FIG. 4.

3 is a block diagram of a digital image processing apparatus according to the present invention.

Referring to FIG. 3, the digital image processing apparatus 100 according to the present invention includes a controller 141 serving as a control means for controlling the operation of the entire camera, and a plurality of components operating according to control signals from the controller 141. Elements (eg, lens unit 120, shutter 126, imaging device 127, finder optics 130, etc.).

The lens unit 120 includes a first lens 121 and a second lens 123, and an aperture 122 is disposed between the first lens 121 and the second lens 123. The first lens 121 and the second lens 123 of the lens unit 120 are driven and controlled by the lens driving circuit 135, and the aperture 122 is controlled by the aperture driving circuit 136. Is done.

On the optical axis of the first lens 121 and the second lens 123, a mirror 124 is formed at the rear of the second lens 123, the center portion of which is composed of a half mirror. do. The mirror 124 is formed to be rotatable within a predetermined angle about the axis 124a.

In addition, a sub mirror 125 is formed on the rear surface of the mirror 124. Some of the light incident on the lens unit 120 passes through the mirror 124 and is reflected by the sub-mirror 125. A separator optical system 128 for two-phase separation is disposed on the reflected light axis of the submirror 125. The AF sensor 129 is disposed at an image forming position on the subject by the separator optical system 128. The AF sensor 129 is connected to the AF sensor driving circuit 138.

The submirror 125, the separator optical system 128, and the AF sensor 129 constitute a focus detection apparatus by a known phase difference method. The AF sensor 129 is driven and controlled by the AF sensor driving circuit 138 under the control of the controller 141. That is, the controller 141 calculates the defocus amount based on the image signal generated by the AF sensor 129, and controls the lens driving circuit 135 using the same to control the first lens 121 of the lens unit 120. ) And the second lens 123 to focus. Here, the lens driving circuit 135 includes a driving source such as an electronic motor or an ultrasonic motor, a driver circuit for controlling the same, an encoder device for detecting the position of the lens, and the like.

A finder optical system 130 including a focus plate 131, a pentaprism 132, and a view finder 133 is disposed on the path of the light reflected by the mirror 124. The subject light obtained by the first lens 121 and the second lens 123 of the lens unit 120 is reflected by the mirror 124 and formed in the focusing plate 131. The photographer may check an image of a subject formed on the focus plate 131 using the pentaprism 132 and the view finder 133.

The mirror 124 and the sub-mirror 125 are formed to be rotatable by a mirror driving circuit 137 within a predetermined range with respect to the axis 124a of the mirror 124. The first lens 121 and the second lens 123 may be driven to retract from the optical axis. A shutter 126 and an imaging device 127 are disposed behind the mirror 124 on the optical axis of the lens unit 120.

The shutter 126 is opened for a predetermined time by the drive control of the shutter driving circuit 139, and the image of the subject is picked up by the imaging device 127. That is, the mirror 124 is raised to retract from the optical axis of the lens unit 120 by the drive control of the mirror drive circuit 137, and the shutter 126 is opened by the drive control of the shutter drive circuit 139. When it is in a state, it is formed on the subject on the imaging element 127.

The lens driving circuit 135, the aperture driving circuit 136, the mirror driving circuit 137, the AF sensor driving circuit 138, and the shutter driving circuit 139 are connected to a microprocessor through a data bus 152. It is connected to the control part 141 comprised by ().

In addition, the switch input means 142 and the EEPROM 143 which is a nonvolatile memory are also connected to the control part 141 which consists of a microprocessor via the data bus 152. FIG.

The switch input means 142 is a first release switch and a shutter that are turned on by a first image capturing signal as a half shutter signal of the shutter-release button (see 111 in FIG. 1) of the digital image processing apparatus 100. -A plurality of switches such as a second release switch that is turned on by the second image capture signal as a complete shutter signal of the release button (see 111 in FIG. 1), and a power switch that is linked to a power button (not shown) ), The operation signal by any one switch operation of the switch input means 142 is supplied to the control unit 141.

The control unit 141 controls to drive the AF sensor driving circuit 138 when the first release switch is turned on, calculates a distance between two phases on the AF sensor 129, and uses the lens driving circuit from the distance data. The drive control of the 135 is performed to perform focus adjustment of the first lens 121 and the second lens 123 of the lens unit 120.

The control unit 141 controls to drive the mirror driving circuit 137 when the second release switch is turned on to drive the mirror 124 out of the optical axis, and to the output of the AF sensor 129. An appropriate cross-sectional shrinkage value and a shutter exposure time are obtained based on the subject luminance information on which it is based. Then, the aperture driving circuit 136 is driven and controlled using the contraction value to drive the aperture 122, and the shutter driving circuit 137 is driven and controlled using the shutter exposure time to control the shutter 126. Drive.

If the image of the subject is imaged on the imaging surface of the image pickup device 127 by such an operation, the image of the subject is converted into an analog image signal, which is converted into a digital image signal by the signal processing circuit 145. do.

The signal processing circuit 145 is connected to the EPROM 147, the SDRAM 148, and the flash memory 150 using the data bus 151.

The EPROM 147 stores programs executed by a processor included in the signal processing circuit 145. The synchronous dynamic random-access memory (SDRAM) 148 is a memory for temporarily storing image data before image processing and image data during image processing. The flash memory 150 is a nonvolatile memory that stores finally determined image data. The SDRAM 148 is a volatile temporary storage means capable of high speed operation but the memory contents are destroyed when the power supply is cut off, whereas the flash memory 150 is a nonvolatile storage means and operates at a low speed, but the power supply is cut off. Even if it is, the contents of memory are preserved.

Hereinafter, the maximum recognition distance adjusting mechanism using the detector in the digital image processing apparatus according to an embodiment of the present invention will be described in detail.

4 is a diagram illustrating a detector of a digital image processing apparatus according to an embodiment of the present invention, FIG. 5 is a graph illustrating reflectance according to a difference in skin color, and FIG. 6 (a) shows that the light emitter 161 is turned on ( FIG. 6B is a graph showing waveforms of pulses applied to the light emitting unit 161. FIG.

In detail, a conventional digital image processing apparatus is generally provided with a display unit (see 117 of FIG. 2) such as an LCD in order to check a captured image and further implement a live-view function. A certain amount of power is consumed to drive the display unit. Therefore, if the display unit is ON while the photographer is checking the subject through the viewfinder (see 133 of FIG. 2), unnecessary power is consumed. In order to solve this problem, some of the conventional digital image processing apparatus applies an eye sensor around the viewfinder, and automatically turns off the display unit when a photographer is detected within a certain distance from the viewfinder. This prevents unnecessary power consumption.

However, in the conventional digital image processing apparatus to which the eye sensor is applied as described above, the photographer recognition distance is set based on a specific reflectance. In other words, the average reflectance (about 45%) of the people is set as a reference, and based on this, it is determined whether the photographer is within a predetermined distance.

However, people with darker skin tend to have lower reflectances, and those with lighter skin tone tend to have higher reflectances. That is, as shown in FIG. 5 showing the reflectance according to the skin color difference, the reflectance of the white female having the largest reflectance and the black female having the smallest reflectance is almost doubled. When ignoring such a difference in individual reflectance and determining whether the photographer approaches a predetermined distance based on a specific fixed value, there is a problem that the recognition distance of the detection object is changed. For example, in the case of black people, since the reflectance is small, the recognition distance is shortened, and even if the photographer approaches the predetermined distance from the view finder, the display unit is not turned off and continues to be turned on, thereby consuming unnecessary power. On the contrary, in the case of white people, the recognition distance is long because the reflectance is large, so that even when the photographer is not closer to the viewfinder than the reference distance, the display may be recognized and turned off.

In order to solve such a problem, the digital image processing apparatus 100 according to an embodiment of the present invention is characterized by adjusting the maximum recognition distance of the detector according to the light reflectance of the photographer.

First, referring to FIG. 4, the detector 160 of the digital image processing apparatus according to the exemplary embodiment includes a light emitter 161 and a light receiver 162.

In detail, the light emitter 161 and the light receiver 162 are disposed at one side of the view finder 133 of the digital image processing apparatus 100. The light emitting unit 161 emits predetermined light. Here, various kinds of light sources such as a light emitting diode (LED) may be used as the light emitting unit 161. The light receiver 162 detects light emitted from the light emitter 161 and reflected by the photographer. The light receiving unit 162 outputs a predetermined output value to the control unit (see 141 of FIG. 3) based on the detected light. As the light receiving unit 162, various types of light receiving devices such as a photo diode may be used. Here, although the light receiver 162 is disposed above the view finder 133 and the light emitter 161 is disposed below the view finder 133, the spirit of the present invention is not limited thereto. That is, as long as the light emitted from the light emitter 161 is reflected to the photographer and enters the light receiver 162, the positions of the light emitter 161 and the light receiver 162 may be freely changed.

When the photographer is separated from the view finder 133 by a certain distance or more, since no object exists around the view finder 133, the light emitted from the light emitter 161 does not enter the light receiver 162. . On the other hand, when the photographer approaches the eye EYE to the view finder 133 to observe the subject through the view finder 133, the light emitted from the light emitter 161 is reflected by the photographer to receive the light receiver 162. Will be entered. The light receiving unit 162 outputs a light receiving signal corresponding to the incident light amount to the controller (see 141 of FIG. 3) as an output value.

The controller (see 141 of FIG. 3) adjusts the maximum recognition distance of the detector 160 based on the output value output from the light receiver 162.

In detail, the digital image processing apparatus 100 is set to a default value of the maximum recognition distance of the detector 160 based on the photographer having the reference reflectance.

For example, when the maximum recognition distance of the detector 160 is 5 cm and the photographer having the reference reflectance approaches 5 cm from the view finder 133, the output value of the light receiver 162, that is, the reference value V _ref is 1.3. Assume the case of V. In this case, when a photographer having a reference reflectance approaches a 5 cm distance from the view finder 133, the controller (see 141 of FIG. 3) detects that the photographer approaches the view finder 133, and the light receiving unit 162 at this time. ), The output value (V _eye ) becomes 1.3V.

By the way, when the reflectance of the photographer is higher than the reference reflectance, since the amount of light reflected by the photographer is larger than the reference, even when the output value V _eye of the light receiving unit 162 is smaller than 1.3 V, which is the reference value V _ref , the photographer It is detected that has approached the view finder 133. That is, if the output value V _eye of the light receiving unit 162 at the time when it is detected that the photographer approaches the view finder 133 is smaller than 1.3 V which is the reference value V _ref (that is, V _ref > V _eye ), the photographer It may be determined that the reflectance is higher than the reference reflectance. Therefore, in this case, it is necessary to reduce the maximum recognition distance of the detector 160.

Here, in the digital image processing apparatus 100 according to the exemplary embodiment of the present invention, in order to reduce the maximum recognition distance of the detector 160, the light divergence time emitted by the light emitter 161 is reduced. That is, by reducing the light divergence time emitted by the light emitting unit 161, and consequently by reducing the amount of light reflected by the photographer, the maximum recognition distance of the detection unit 160 is reduced.

In order to reduce the light divergence time emitted by the light emitter 161 as described above, the controller (see 141 of FIG. 3) may reduce the number of pulses of the light emitter 161 or reduce the duty ratio of the pulses. Or adjust the frequency of the pulse long. That is, in the state where the existing pulse waveform is as shown in Figs. 6 (a) and 6 (b), when the number of pulses is reduced, the duty ratio of the pulses is reduced, or the frequency of the pulses is adjusted, the light emitting unit ( The time for which 161 emits light is reduced, and as a result, the maximum recognition distance of the detector 160 may be reduced by reducing the amount of light reflected by the photographer.

On the other hand, when the reflectance of the photographer is lower than the reference reflectance, since the amount of light reflected by the photographer is less than the reference, the output value (V _eye ) of the light receiving unit 162 is greater than 1.3V, the reference value (V _ref ), the photographer It is detected that has approached the view finder 133. That is, when the output value V _eye of the light receiving unit 162 at the time when it is detected that the photographer approaches the view finder 133 is greater than 1.3 V, that is, the reference value V _ref (that is, V _ref <V _eye ), the photographer It may be determined that the reflectance is lower than the reference reflectance. Therefore, in this case, it is necessary to increase the maximum recognition distance of the detector 160.

Here, in the digital image processing apparatus 100 according to the exemplary embodiment of the present invention, in order to increase the maximum recognition distance of the detector 160, the light divergence time emitted by the light emitter 161 is increased. That is, the maximum recognition distance of the detection unit 160 is increased by increasing the light divergence time emitted by the light emitting unit 161 and consequently increasing the amount of light reflected by the photographer.

In order to increase the light divergence time emitted by the light emitter 161 as described above, the controller (see 141 of FIG. 3) increases the number of pulses of the light emitter 161 or increases the duty ratio of the pulses. Or shorten the frequency of the pulse. That is, in the state where the existing pulse waveform is as shown in Figs. 6 (a) and 6 (b), when the number of pulses is increased, the duty ratio of the pulses is increased, or the frequency of the pulses is shortened, the light emitting unit ( The time for which 161 emits light is increased, and as a result, the maximum recognition distance of the detector 160 may be increased by increasing the amount of light reflected by the photographer.

According to the present invention as described above, an effect of minimizing unnecessary power loss can be obtained. That is, in the related art, since the reflectance is different for each photographer, there is a problem that unnecessary power loss occurs because the maximum recognition distance of the detector is also different for each photographer. However, according to the digital image processing apparatus according to the exemplary embodiment of the present invention, the maximum recognition distance of the detector is automatically adjusted when the photographer changes, thereby minimizing unnecessary power loss.

Hereinafter, a control method of a digital image processing apparatus according to an embodiment of the present invention will be described in detail.

7 is a flowchart illustrating a control method of a digital image processing apparatus according to an embodiment of the present invention. Referring to FIG. 7, in the control method of the digital image processing apparatus according to the exemplary embodiment of the present invention, the photographer approaches the detector (step S110), the output value V _eye and the predetermined reference value V _ref of the detector. Comparing (S120), and when the output value V _eye of the detector is smaller than a predetermined reference value V _ref (S130), reducing the maximum recognition distance of the digital image processing apparatus (S120). Step S135), when the output value V _eye of the detector is greater than a predetermined reference value V _ref (step S140), increasing the maximum recognition distance of the digital image processing apparatus (step S145); and And storing the reduced or increased maximum recognition distance value (step S150).

This will be described in more detail as follows.

When the photographer is separated from the viewfinder by more than a certain distance, since no object exists around the viewfinder, the light emitted from the light emitter (see 161 of FIG. 4) enters the light receiver (see 162 of FIG. 4). Not.

On the other hand, when the photographer approaches the eye to the viewfinder to observe the subject through the viewfinder (step S110), the light emitted from the light emitter (see 161 of FIG. 4) is reflected by the photographer to receive the light receiver (FIG. 4). (See 162). The light receiving unit 162 of FIG. 4 outputs a light receiving signal corresponding to the incident light amount to the controller (see 141 of FIG. 3) as an output value.

Next, the controller (see 141 of FIG. 3) compares the output value V _eye of the detector with a predetermined reference value V _ref (step S120), so that the output value V _{eye of the} detector is a predetermined reference value V _ref . If smaller (step S130), the maximum recognition distance of the digital image processing apparatus is reduced (step S135), and when the output value V _{eye of the} detector is larger than a predetermined reference value V _ref (step S140), the digital The maximum recognition distance of the image processing apparatus is increased (step S145).

In detail, in the digital image processing apparatus, a default value of the maximum recognition distance of the detector based on the photographer having the reference reflectance is set.

For example, it is assumed that the maximum recognition distance of the detector is 5 cm, and the output value of the light receiver, that is, the reference value V _ref , is 1.3 V when the photographer having the reference reflectance approaches the distance of 5 cm from the viewfinder. In this case, when the photographer with the reference reflectance approaches 5 cm from the viewfinder, the controller detects that the photographer has approached the viewfinder, and the output value V _eye of the light-receiving unit at this time is 1.3V.

By the way, when the reflectance of the photographer is higher than the reference reflectance, the amount of light reflected by the photographer is larger than the reference, so that even when the output value V _{eye of the} light receiving unit is smaller than 1.3 V which is the reference value V _ref , Detects approaching That is, the photographer hayeoteum access to the viewfinder, if the output value of the light receiving portion of the detection point (V _eye) is smaller than the reference value (V _ref) 1.3V (i.e., V _ref> V _eye), than a reflectance of the photographed person based on the reflectance It can be judged that it is a high case. Therefore, in this case, it is necessary to reduce the maximum recognition distance of the detector.

As such, in order to reduce the maximum recognition distance of the detector, the light divergence time emitted by the light emitter is reduced. That is, by reducing the light divergence time emitted by the light emitting portion, and consequently by reducing the amount of light reflected by the photographer, the maximum recognition distance of the detection portion is reduced.

Here, in order to reduce the light divergence time emitted from the light emitting part, the control part reduces the number of pulses of the light emitting part, or decreases the duty ratio of the pulse, or adjusts the frequency of the pulse long.

On the other hand, when the photographer's reflectance is lower than the reference reflectance, since the amount of light reflected by the photographer is smaller than the reference, the photographer needs to view the viewfinder only when the output value V _{eye of the} light receiver is larger than 1.3 V, which is the reference value V _ref . Detects approaching That is, if the output value V _eye of the light receiver is greater than 1.3 V, that is, the reference value V _ref (ie, V _ref <V _eye ), the reflectance of the photographer is greater than the reference reflectance. It can be judged that the case is low. Therefore, in this case, it is necessary to increase the maximum recognition distance of the detector.

As such, in order to increase the maximum recognition distance of the detector, the light divergence time emitted by the light emitter is increased. That is, by increasing the light divergence time emitted by the light emitting part, and consequently by increasing the amount of light reflected by the photographer, the maximum recognition distance of the detection part is increased.

Herein, in order to increase the light divergence time emitted by the light emitting part, the controller increases the pulse number of the light emitting part, increases the duty ratio of the pulse, or shortens the frequency of the pulse.

According to the present invention as described above, an effect of minimizing unnecessary power loss can be obtained. That is, in the related art, since the reflectance is different for each photographer, there is a problem that unnecessary power loss occurs because the maximum recognition distance of the detector is also different for each photographer. However, according to the digital image processing apparatus according to the exemplary embodiment of the present invention, the maximum recognition distance of the detector is automatically adjusted when the photographer changes, thereby minimizing unnecessary power loss.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

1 is a view showing the front appearance of a digital image processing apparatus according to the present invention.

2 is a diagram illustrating an outer appearance of a digital image processing apparatus according to the present invention.

3 is a block diagram of a digital image processing apparatus according to the present invention.

4 is a diagram illustrating a detector of a digital image processing apparatus according to an embodiment of the present invention.

5 is a graph showing the reflectance according to the skin color difference.

6 (a) is a graph showing a light emitting unit turned on / off.

6B is a graph showing waveforms of pulses applied to the light emitting unit.

7 is a flowchart illustrating a control method of a digital imaging apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: digital image processing apparatus 120: lens unit

124: mirror 126: shutter

127: imaging device 129: AF sensor

130: finder optical system 131: focusing plate

132: penta prism 133: view finder

141: control unit 145: signal processing circuit

160: detection unit 161: light emitting unit

162: light receiver

Claims (17)

A digital image processing apparatus comprising a viewfinder for a photographer to observe a subject and a display unit to which an image is electrically implemented. A detector disposed at one side of the view finder, the detector including a light emitting unit emitting light and a light receiving unit receiving the light reflected by the photographer; And A control unit controlling whether to supply power to the display unit based on an output value output from the detection unit; And the control unit adjusts a maximum recognition distance of the detection unit according to the light reflectance of the photographer. The method of claim 1, The control unit, If the light reflectance of the photographer is greater than the reference reflectance reduces the maximum recognition distance of the detector, And if the light reflectance of the photographer is less than a reference reflectance, increasing the maximum recognition distance of the detector. The method of claim 1, And the controller controls the maximum recognition distance of the detector by adjusting the light divergence time of the light emitter. The method of claim 3, wherein The control unit, If the light reflectance of the photographer is greater than the reference reflectance to reduce the amount of light emitted from the light emitting portion, And if the light reflectance of the photographer is less than a reference reflectance, the amount of light emitted from the light emitting unit is increased. The method of claim 3, wherein The control unit, By comparing the output value (V _eye ) output from the detection unit with a predetermined reference value (V _ref ), If the output value is larger than the predetermined reference value, the amount of light emitted from the light emitting unit is increased. And if the output value is smaller than the predetermined reference value, reduce the amount of light emitted from the light emitting unit. The method of claim 3, wherein And the control unit adjusts the light divergence time of the light emitting unit by adjusting the number of pulses of the light emitting unit or the duty ratio of the pulse or the frequency of the pulse. The method of claim 6, And the controller increases the light divergence time of the light emitting part by increasing the number of pulses of the light emitting part, increasing the duty ratio of the pulse, or shortening the frequency of the pulses. The method of claim 6, And the control unit reduces the light divergence time of the light emitting unit by reducing the number of pulses of the light emitting unit, reducing the duty ratio of the pulse, or increasing the frequency of the pulses. The method of claim 1, And the controller cuts off the power supplied to the display unit when it is determined that the photographer exists within a predetermined distance from the digital image processing apparatus. A control method of a digital image processing apparatus comprising a viewfinder for a photographer to observe a subject and a display unit to which an image is electrically implemented. Comparing the output value V _eye of the detector with a predetermined reference value V _ref ; Reducing the maximum recognition distance of the digital image processing apparatus when the output value V _eye of the detector is smaller than a predetermined reference value V _ref ; Increasing the maximum recognition distance of the digital image processing apparatus when the output value V _eye of the detector is greater than a predetermined reference value V _ref ; And And storing the reduced or increased maximum recognition distance value. 11. The method of claim 10, In the step of comparing the output value (V _eye ) of the detector with a predetermined reference value (V _ref ), If the light reflectance of the photographer is greater than the reference reflectance, the output value (V _eye ) of the detector is smaller than the predetermined reference value (V _ref ), And if the photographer's light reflectance is less than a reference reflectance, an output value V _eye of the detector is greater than a predetermined reference value V _ref . 11. The method of claim 10, The detection unit includes a light emitting unit for emitting light, and a light receiving unit for receiving the light reflected by the photographer characterized in that the control method of the digital image processing apparatus. 13. The method of claim 12, Increasing and / or decreasing the maximum recognition distance of the digital image processing apparatus may include: The control method of the digital image processing apparatus, characterized in that performed by adjusting the light divergence time of the light emitting unit. The method of claim 13, Increasing and / or decreasing the maximum recognition distance of the digital image processing apparatus may include: If the light reflectance of the photographer is greater than the reference reflectance to reduce the amount of light emitted from the light emitting portion to reduce the maximum recognition distance, And if the light reflectance of the photographer is less than a reference reflectance, increasing the amount of light emitted from the light emitting unit to increase the maximum recognition distance. 13. The method of claim 12, Reducing the maximum recognition distance of the digital image processing apparatus, And reducing the pulse number of the light emitting part, reducing the duty ratio of the pulse, or increasing the frequency of the pulse. 13. The method of claim 12, Increasing the maximum recognition distance of the digital image processing apparatus, And increasing the pulse number of the light emitting part, increasing the duty ratio of the pulse, or shortening the frequency of the pulse. 11. The method of claim 10, After the above steps, And shutting off the power supplied to the display unit when it is determined that the photographer exists within a predetermined distance from the digital image processing apparatus.

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