KR20100096521A - Apparatus for processing digital image and method for controlling thereof - Google Patents

Abstract

PURPOSE: A device for processing a digital image and a method for controlling the same are provided to set focur by a first signal and calculates a focus value by set time interval between a first signal and a second signal. CONSTITUTION: Focus is adjusted by obtaining a focus value according to input of a first signal(S420). The focus value by the focus adjustment is selected as a reference focus value(S430). Before inputting a second signal, an input image is inputted(S440). A current focus value corresponding to focus value of input image is calculated(S450). By comparing the focus value and the current focus value, a current focus state is determined(S460,S461,S462).

Description

Apparatus for processing digital image and method for controlling Technical Field

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 method of controlling the same, capable of performing focusing by adjusting the focus while moving a focus lens along an optical axis. will be.

Typically, the digital image processing apparatus includes all devices that process images such as a digital camera, a personal digital assistant (PDA), a phone camera, a PC camera, or use an image recognition sensor.

The digital image processing apparatus may image an image received through an image pickup device by a digital signal processor, compress the image, generate an image file, and store the image file in a memory.

In addition, the digital image processing apparatus may display and display an image of an image file received through an imaging device or stored in a storage medium on a display device such as a liquid crystal display (LCD).

Meanwhile, the digital image processing apparatus may perform focusing by photographing by adjusting the focus while moving the focus lens along the optical axis. To this end, the input image may be input, the focus value may be obtained from the input image, and the focus lens may be moved to capture the focus by moving the focus lens so that the focus value is within the set range.

SUMMARY OF THE INVENTION The present invention provides a digital image processing apparatus and a control method thereof in which focus information is obtained by focusing by a first signal and obtaining a focus value at a time interval set between the first signal and the second signal. The purpose.

The present invention includes the steps of sensing the input of the first signal; Adjusting a focus by obtaining a focus value according to an input of the first signal; Selecting a focus value by the focus adjustment as a reference focus value; Receiving an input image before a second signal generated after the first signal is input; Calculating a current focus value corresponding to a focus value of the input image; Determining the current focus state by comparing the current focus value with the reference focus value; And it provides a control method of a digital image processing apparatus comprising the step of sensing the second signal.

The method may further include informing a focus state to the outside according to the current focus state.

At least a portion of the input image may be set as a focus area, and the focus value may be calculated in the focus area.

The focus state may be displayed in the focus area.

The focus state may be output as a predetermined icon, image, or text message.

If it is determined that the second signal is detected in the detecting of the second signal, the photographing of the input image may be performed.

If it is determined that the second signal is not detected in the step of detecting the second signal, the step of receiving the input image may be repeatedly performed at a set time interval.

Another aspect of the invention, the image input unit to which the input image is input; A user manipulation unit to which a first signal and a second signal generated after the first signal are input by the manipulation; A controller configured to adjust focus by the first signal, calculate a focus value by receiving the input image at a time interval set between the first signal and the second signal, and detect a focus state; And a focus adjusting unit which moves the focus lens by the focus adjustment.

By adjusting the focus from the input image according to the first signal, a reference focus value is selected based on the focused focus value, and a current focus value corresponding to the focus value of the input image is input before the second signal is input. The current focus state may be detected by comparing the current focus value with the reference focus value.

The display apparatus may further include a display configured to display a focus state according to the current focus state.

At least a portion of the input image may be set as a focus area, and the focus value may be calculated in the focus area.

The focus state may be displayed in the focus area.

The focus state may be output and displayed as a predetermined icon, image, or text message.

Photographing of an input image may be performed according to the input of the second signal.

After the first signal is input and before the second signal is input, the current focus value may be calculated by repeatedly receiving the input image at a set time interval.

According to the digital image processing apparatus and the control method thereof according to the present invention, the focus can be easily adjusted by focusing by the first signal and obtaining a focus value at a time interval set between the first signal and the second signal. have.

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

FIG. 1 is a rear view of a digital camera 100 which is an embodiment of a digital image processing apparatus according to the present invention.

Referring to the drawings, on the back of the digital camera 100, the direction button 21, the menu-OK button 22, the wide angle (Zoom) button (W), the telephoto (Zoom) ) Button T, a speaker SP, and a display panel 25 may be provided.

The direction button 21 may include four buttons, an up button 21a, a down button 21b, a left button 21c, and a right button 21d. The direction button 21 and the menu-OK button 22 are keys for executing various menus relating to the operation of the digital image processing apparatus such as a digital camera. Sound may be output to the speaker SP.

The wide-angle zoom button W or the tele-zoom button T has a wider angle of view or a narrower angle of view depending on its input. In particular, it may be used to change the size of the selected exposure area. In this case, when the wide-zoom button W is input, the size of the selected exposure area increases, and when the tele-zoom button T is input, the size of the selected exposure area may decrease.

As the display panel 25, an image display device such as a liquid crystal display (LCD) may be used. The display panel 25 may be included in the display unit 350 of FIG. 3 in which the focus state is displayed on the input image.

Meanwhile, a power switch 23, a shutter release button 24, a flash (not shown), and a lens unit (not shown) may be provided on the front or top surface of the digital camera 100.

The direction button 21, the menu-OK button 22, the power switch 23, the shutter release button 24, and the like may be included in the user control unit (360 of FIG. 3) for inputting items that the user wants to operate from the outside. Can be.

The power switch 23 may be used to turn on or off the power for the digital camera 100 to operate. The shutter release button 24 opens and closes to expose the film or the image pickup device such as a charge coupled device (CCD) for a predetermined time. In addition, the shutter release button records an image on the image pickup device by properly exposing a subject in association with an aperture (not shown).

On the other hand, the shutter release button 24 may be pressed in two stages. When the shutter release button 24 is pressed to one end, a first signal S1 may be generated, and when the shutter release button 24 is pressed to one end, a second signal S2 may be generated. A shooting preparation setting including focus adjustment may be performed by the first signal S1, and a shooting operation may be performed by the second signal S2.

In the present invention, the reference focus value is obtained by using the first signal S1 to focus, the current focus value is obtained at a predetermined time interval set between the first signal S1 and the second signal S2, and the current focus value is obtained. The current focus state can be known by comparing with the reference focus value.

This may indicate to the user that focus is lost or to readjust the focus even when the subject is moved or the digital camera is moved and the focus is out of focus before the second signal S2 is input after focusing by the first signal S1. To do so.

As an embodiment of a digital image processing apparatus to which the present invention can be applied, a digital camera, a control apparatus, and a control method thereof are disclosed in US Patent Application Publication No. 2004/0130650 (name: automatic using a secondary function of the camera). Method of automatically focusing using a quadratic function in camera.

Matters relating to the digital camera, the control apparatus, and the control method disclosed in the above-mentioned US application will be included in the present specification, the detailed description thereof will be omitted.

2 is a block diagram of a control device 200 of a digital image processing apparatus, which is a preferred embodiment of the present invention. The control device 200 of the digital image processing apparatus may be mounted in the digital camera 100 of FIG. 1.

Referring to the drawing, an optical system OPS including a lens unit and a filter unit optically processes light from a subject. The lens unit of the optical system OPS includes a zoom lens, a focus lens, and a compensation lens. When the user presses the wide-angle zoom button W or the tele-zoom button T included in the user input unit INP, a signal corresponding thereto is input to the microcontroller 212.

Accordingly, as the microcontroller 212 controls the lens driver 210, the zoom motor M _Z is driven to move the zoom lens. That is, when the wide-zoom button W is pressed, the focal length of the zoom lens is shortened to widen the angle of view, and when the tele-zoom button T is pressed, the focal length of the zoom lens becomes long and the angle of view is narrowed.

On the other hand, in the auto focusing mode, the main controller embedded in the digital signal processor 207 controls the lens driver 210 through the microcontroller 212, and thus the focus motor M _F is driven. do. That is, the focus lens is moved to the focus position where the sharpest picture is obtained by driving the focus motor M _F.

The auto focus mode may be performed according to the first signal S1 generated by pressing the shutter release button 24 (refer to FIG. 1) input through the user input unit INP. At this time, the plurality of images are input while the position of the focus lens is moved along the optical axis, and the focus position of the focus lens that obtains the clearest image among the plurality of images is obtained.

Here, the focus value at the focus position may be a reference focus value. The lens driver 210 and the focus motor M _F may be included in the focus adjuster 370 of FIG. 3 that moves the focus lens to adjust the focus according to the present invention.

The compensation lens compensates for the overall refractive index and is not driven separately. Reference numeral M _A denotes an aperture adjusting motor M _A for driving an aperture (not shown).

In the filter section of the optical system OPS, an optical low pass filter removes optical noise of high frequency components. Infra-Red cut filter cuts the infrared component of the incident light.

The photoelectric conversion unit OEC may include an imaging device such as a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS). The photoelectric conversion unit OEC converts light from the optical system OPS into an electrical analog signal.

The analog-to-digital converter may include a CDS-ADC (Correlation Double Sampler and Analog-to-Digital Converter) device 201. The analog-to-digital converter processes the analog signal from the photoelectric converter (OEC), removes the high frequency noise, adjusts the amplitude, and converts the analog signal into a digital signal. Here, the digital signal processor 207 controls the timing circuit 202 to control the operation of the photoelectric converter OEC and the analog-to-digital converter 201.

The optical system OPS, the photoelectric conversion unit OEC, the CDS-ADC element 201, and the like may be included in the image input unit 310 of FIG. 3.

The real time clock 203 provides time information to the digital signal processor 207. The digital signal processor 207 processes digital signals from the CDS-ADC element 201 to generate digital image signals classified into luminance (Y value) and chromaticity (R, G, B) signals.

The light emitting unit LAMP driven by the microcontroller 212 under the control of the main controller built in the digital signal processor 207 includes a self-timer lamp, an auto-focus lamp, a mode indicating lamp, a flash standby lamp, and the like. May be included.

The user input unit INP may include a direction button 21, a menu-OK button 22, a power switch 23, a shutter release button 24, and the like. The user input unit INP may be included in the user manipulation unit 360 of FIG. 3.

The digital image signal from the digital signal processor 207 is temporarily stored in the DRAM (Dynamic Random Access Memory) 204. The EEPROM (Electrically Erasable and Programmable Read Only Memory) 205 stores algorithms and setting data such as a boot program and a key input program required for the operation of the digital signal processor 207. In the memory card interface 206, a user's memory card may be attached or detached.

The digital signal processor 207 and / or the microcontroller 212 may be included in the controller 320 of FIG. 3 according to the present invention. The digital signal processor 207 and / or the microcontroller 212 may also be equipped with cache memory as temporary storage space.

In this case, the cache memory and the DRAM 204 may be included in the first storage unit 330 of FIG. 3 that temporarily stores the reference focus value and the current focus value. The cache memory included in the first storage unit 330 of FIG. 3 may be included separately from the digital signal processor 207 and / or the micro controller 212.

The memory card recognized through the memory card interface 206 may be included in the second storage unit 340 of FIG.

The digital image signal from the digital signal processor 207 is input to the display panel driver 214, whereby the image is displayed on the display panel 215.

The controller 200 of the digital image processing apparatus may further include display units 214 and 215. The display units 214 and 215 may include a display panel 215 and a display panel driver 214 for driving the display panel 215. The display units 214 and 215 may be included in the display unit 350 of FIG. 3 in which the focus state is displayed on the input image.

On the other hand, the digital image signal from the digital signal processor 207 can be transmitted by serial communication via a universal serial bus (USB) connection portion 31a or an RS232C interface 208 and the connection portion 31b thereof, and a video filter ( 209 and through the video output unit 31c. Here, the digital signal processor 207 may incorporate a microcontroller therein.

The audio processor 213 outputs the audio signal from the microphone MIC to the digital signal processor 207 or the speaker SP, and outputs the audio signal from the digital signal processor 207 to the speaker SP. .

3 is a block diagram of a digital image processing apparatus 300 according to a preferred embodiment of the present invention. The digital image processing apparatus 300 may be controlled by the control method S400 of the digital image processing apparatus illustrated in FIG. 4.

Referring to the drawings, the digital image processing apparatus 300 includes an image input unit 310; The control unit 320; Storage units 330 and 340; Display unit 350; A user manipulation unit 360; And a focus adjuster 370.

The image input unit 310 receives an input image. The user manipulation unit 360 receives a first signal S1 and a second signal S2 generated after the first signal S1 by the manipulation.

The control unit 320 adjusts the focus by the first signal S1, receives an input image at a time interval set between the first signal S1 and the second signal S2, calculates a focus value, and then focuses the result. Can be detected.

The focus adjusting unit 370 moves the focus lens by adjusting the focus. The display unit 350 may display the focus state according to the current focus state.

The digital image processing apparatus 300 obtains and focuses a reference focus value by using the first signal S1, and receives an input image at a predetermined time interval set between the first signal S1 and the second signal S2. The current focus state is obtained by comparing the current focus value with a reference focus value.

Therefore, even if the subject moves or the digital camera moves and the focus is out of focus before the second signal S2 is input after focusing by the first signal S1, the user is notified that the focus is off or the focus is readjusted. You can do that.

Meanwhile, the focus is adjusted from the input image by the first signal S1 to select a reference focus value based on the focus value whose focus is adjusted, and the current corresponding to the focus value of the input image before the second signal S2 is input. The current focus state may be detected by calculating a focus value and comparing the current focus value with a reference focus value.

At least a portion of the input image may be set as a focus area, and a focus value may be calculated in the focus area.

When the second signal S2 is input, photographing of an image input at the position of the currently adjusted focus lens may be performed. After the first signal S1 is input and before the second signal S2 is input, the current focus value may be calculated by repeatedly inputting the input image at a set time interval. In this case, the current focus values calculated at regular time intervals may be compared with the reference focus values, respectively, to obtain a current focus state.

The focus state may be output and displayed as a predetermined icon, image, or text message. In one embodiment, the focus state may be displayed in the focus area. In this case, at least a part of the input image may be set as a focus area, and a focus value may be calculated in the focus area.

In FIG. 5, when the focus is achieved, the input image 50 is displayed, and the focus display 52 indicating the current focus state is displayed on the focus area 51 of the input image 50. In FIG. 6, when the focus is not corrected, the input image 60 is displayed, and the focus display 62 indicating the current focus state is displayed on the focus area 61 of the input image 60.

In another embodiment, the focus state may display a predetermined icon according to the focus state. In this case, an icon representing the focus state may be displayed at one corner of the input image.

In FIG. 7, when the focus is achieved, the input image 70 is displayed, and the focus display 72 indicating the current focus state is displayed as a predetermined icon in one corner of the input image 70. In FIG. 8, the input image 80 is displayed when the focus is not correct, and the focus display 82 indicating the current focus state is displayed as a predetermined icon in one corner of the input image 80.

As described above, the focus state is displayed in the focus display step S461, whereby the focus is caused by the shaking of the digital image processing apparatus that performs the moving or photographing of the subject between the first signal S1 and the second signal S2. You can prevent the picture from being taken incorrectly.

The image input unit 310 receives an input image from the outside. The image input unit 310 may include an optical system (OPS), a photoelectric converter (OEC), a CDS-ADC device 201, and the like illustrated in FIG. 2.

The controller 320 may include an image input unit 310; Storage units 330 and 340; Display unit 350; A user manipulation unit 360; And control the focus adjusting unit 370 to perform the focus adjustment, and display the focus state to the outside to inform the user. The controller 320 may include the digital signal processor 207 and / or the microcontroller 212 illustrated in FIG. 2.

The storage units 330 and 340 may store a reference focus value, a current focus value, and a captured image. The storage units 330 and 340 may include a first storage unit 330 and a second storage unit 340. The reference focus value and the current focus value may be temporarily stored in the first storage unit 330. The captured image may be stored in the second storage unit 340.

The display unit 350 may include the display panel 25 shown in FIG. 1 and / or the display panel driver 214 and the display panel 215 of FIG. 2.

The user may input a desired command from the outside through the user manipulation unit 360. The user manipulation unit 360 may include the direction button 21 and the menu-OK button 22 of FIG. 1, and / or the user input unit INP of FIG. 2.

The focus adjuster 370 of FIG. 3 may adjust the focus by moving the focus lens. The focus adjuster 370 of FIG. 3 may include a lens driver 210 and a focus motor M _F.

According to the present invention, the focus can be easily adjusted by focusing by the first signal and obtaining a focus value at a time interval set between the first signal and the second signal.

4 is a flowchart illustrating a control method (S400) of a digital image processing apparatus as a preferred embodiment according to the present invention.

The control method S400 of the digital image processing apparatus may be implemented in the digital image processing apparatus of FIGS. 2 and / or 3 and the control apparatuses 200 and 300 thereof. To this end, the control method S400 of the digital image processing apparatus according to the present invention may be a program or algorithm stored in the storage means of FIG. 2 or implemented in the form of a semiconductor chip such as firmware.

Therefore, in the method S400 of controlling the digital image processing apparatus, the same matters as those described for the digital image processing apparatus and the control apparatuses 200 and 300 will be referred to, and detailed description thereof will be omitted.

Referring to the drawings, the control method of the digital image processing apparatus (S400), the first signal detection step (S410); Focus adjusting step S420; Selecting a reference focus value (S430); Input image input step (S440); Calculating the current focus value (S450); Focus state determination step (S460); And a second signal detection step S470.

In the first signal detecting step S410, an input of the first signal S1 is detected. In the focus adjusting step S420, the focus is adjusted by obtaining a focus value according to the input of the first signal S1. In the reference focus value selection step S430, the focus value by focus adjustment is selected as the reference focus value.

In the input image input step S440, the input image is input before the second signal S2 generated after the first signal S1 is input. In the current focus value calculating step (S450), a current focus value corresponding to the focus value of the input image is calculated. In the focus state determination step (S460), the current focus state is determined by comparing the current focus value with the reference focus value. In the second signal detecting step S470, the second signal S2 is detected.

In the control method (S400) of the digital image processing apparatus, a reference focus value is obtained by using the first signal S1 to focus, and the input image is set at a predetermined time interval set between the first signal S1 and the second signal S2. The current focus value can be obtained by obtaining the current focus value and comparing the current focus value with the reference focus value.

Therefore, even if the subject moves or the digital camera moves and the focus is out of focus before the second signal S2 is input after focusing by the first signal S1, the user is informed that the focus is out of focus or readjusted. can do.

In the first signal detecting step S410, an input of the first signal S1 may be detected. The first signal may be an S1 signal generated when the user presses the shutter release button 24 of FIG. 1 in one step. The shooting preparation operation including focus adjustment may be performed by the first signal S1.

In the focus adjusting step S420, the focus may be adjusted by obtaining a focus value according to the input of the first signal S1. In this case, the focus adjustment may be performed in the auto focus mode. For auto focus adjustment, a plurality of input images may be input while the position of the focus lens is moved along the optical axis, and the focus position of the focus lens that obtains the clearest image among the plurality of input images may be obtained.

At least a portion of each input image may be set as a focus area, and a focus value may be calculated in the focus area. In this case, the focus value at the focus position may be the reference focus value. Therefore, in the reference focus value selection step S430, the focus value by focus adjustment may be selected as the reference focus value.

In the input image input step S440, the input image may be input at a predetermined time interval before the second signal is input. In addition, for each input image, a current focus value calculation step S450 and a focus state determination step S460 may be performed.

In the current focus value calculating step S450, a current focus value corresponding to the focus value of the input image may be calculated. In this case, at least a part of the input image may be set as a focus area, and a current focus value may be calculated for the focus area.

In the focus state determination step (S460), the current focus state may be determined by comparing the current focus value with the reference focus value. In this case, if the current focus value is greater than or equal to the reference focus value, it may be determined that the current focus is correct.

In the second signal detection step S470, it may be detected that the second signal S2 is input. In this case, when it is determined that the second signal S2 is detected in the second signal detection step S470 for detecting the second signal S2, the photographing step S480 may be performed by adjusting the current focus.

In addition, if it is determined that the second signal S2 is not detected in the second signal detection step S470, the input image input step S440 for receiving an input image may be repeatedly performed at a set time interval. Accordingly, when it is determined that the second signal S2 is not detected in the second signal detection step S470, the input image input step S440, the current focus value calculation step S450, and the focus state determination step S460. , And the second signal detecting step S470 may be repeatedly performed at regular time intervals.

In addition, the control method (S400) of the digital image processing apparatus may further include a photographing step (S490). In the photographing step S480, when it is determined that the second signal is detected in the second signal sensing step S470 for detecting the second signal, the photographing operation is performed.

Meanwhile, the control method S400 of the digital image processing apparatus may further include focus state display steps S461 and S462 informing the outside of the focus state according to the current focus state. The focus state display steps S461 and S462 may include a focus display step S461 and an out of focus display step S462.

In the focus display step S461, the current focus state may be displayed. In this case, when the current focus value is greater than or equal to the reference focus value as a result of the comparison in the focus state determination step S460, the current focus state may be focused.

In the out of focus display step S462, a current focus state may be displayed. In this case, when the current focus value is smaller than the reference focus value as a result of the comparison in the focus state determination step (S460), the current focus state may be out of focus.

On the other hand, if it is determined that the second signal (S2) is not detected in the second signal detection step (S470), the input image input step (S440), the current focus value calculation step (S450), the focus state determination step (S460), The focus state display steps S461 and S462 and the second signal detection step S470 may be repeatedly performed at regular time intervals.

The focus state may be output as a predetermined icon, image, or text message according to the focus state. In this case, the focus state may be displayed in the focus area of the input image.

In FIG. 5, when the focus is achieved, the input image 50 is displayed, and the focus display 52 indicating the current focus state is displayed on the focus area 51 of the input image 50. In FIG. 6, when the focus is not corrected, the input image 60 is displayed, and the focus display 62 indicating the current focus state is displayed on the focus area 61 of the input image 60.

In another embodiment, the focus state may display a predetermined icon according to the focus state. In this case, an icon representing the focus state may be displayed at one corner of the input image.

In FIG. 7, when the focus is achieved, the input image 70 is displayed, and a focus display 72 indicating a current focus state is displayed as a predetermined icon in one corner of the input image 70. In FIG. 8, the input image 80 is displayed when the focus is not correct, and the focus display 82 indicating the current focus state is displayed as a predetermined icon in one corner of the input image 80.

As described above, the focus state is displayed in the focus display step S461, whereby the focus is caused by the shaking of the digital image processing apparatus that performs the moving or photographing of the subject between the first signal S1 and the second signal S2. You can prevent the picture from being taken incorrectly.

According to the present invention, the focus can be easily adjusted by focusing by the first signal and obtaining a focus value at a time interval set between the first signal and the second signal.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, it is merely an example, and those skilled in the art may realize various modifications and equivalent other embodiments therefrom. I can understand. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

1 is a diagram illustrating a rear surface of a digital camera as an embodiment of a digital image processing apparatus according to the present invention.

FIG. 2 is a block diagram schematically illustrating a control apparatus that may be included in the digital camera of FIG. 1.

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

4 is a flowchart schematically illustrating a control method of a digital image processing apparatus as a preferred embodiment according to the present invention.

5 is a diagram illustrating an embodiment of displaying an input image and a current focus state when a focus is achieved according to the present invention.

FIG. 6 is a diagram illustrating an embodiment of displaying an input image and a current focus state when focus is not achieved according to the present invention.

FIG. 7 is a diagram illustrating another embodiment of displaying an input image and a current focus state when a focus is achieved according to the present invention.

8 is a diagram illustrating another embodiment in which an input image and a current focus state are displayed when focus is not achieved according to the present invention.

Claims (15)

Sensing an input of a first signal; Adjusting a focus by obtaining a focus value according to an input of the first signal; Selecting a focus value by the focus adjustment as a reference focus value; Receiving an input image before a second signal generated after the first signal is input; Calculating a current focus value corresponding to a focus value of the input image; Determining the current focus state by comparing the current focus value with the reference focus value; And And detecting the second signal. The method of claim 1, And informing a focus state to the outside according to the current focus state. The method of claim 2, And setting at least a partial area of an input image as a focus area and calculating the focus value in the focus area. The method of claim 3, And a control method for displaying the focus state in the focus area. The method of claim 2, The control method of the digital image processing apparatus outputting the focus state as a predetermined icon, image, or text message. The method of claim 1, And if the second signal is detected in the detecting of the second signal, performing a photographing of the input image. The method of claim 1, And if it is determined that the second signal is not detected in the step of detecting the second signal, the step of receiving the input image repeatedly at a set time interval. An image input unit to which an input image is input; A user manipulation unit to which a first signal and a second signal generated after the first signal are input by the manipulation; A controller configured to adjust focus by the first signal, calculate a focus value by receiving the input image at a time interval set between the first signal and the second signal, and detect a focus state; And And a focus adjusting unit which moves the focus lens by the focus adjustment. The method of claim 8, By adjusting the focus from the input image according to the first signal, a reference focus value is selected based on the focused focus value, and a current focus value corresponding to the focus value of the input image is input before the second signal is input. And calculating the current focus value by comparing the current focus value with the reference focus value. The method of claim 8, And a display unit which displays a focus state according to the current focus state. The method of claim 10, And setting at least a portion of an input image as a focus area, wherein the focus value is calculated in the focus area. The method of claim 11, And a digital image processing apparatus for displaying the focus state in the focus area. The method of claim 10, And the focus state is output as a predetermined icon, image or text message. 10. The method of claim 9, And a photographing apparatus for photographing the input image according to the input of the second signal. The method of claim 13, And the current image is calculated by receiving the input image repeatedly at a set time interval after the first signal is input and before the second signal is input.

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