KR20100077719A - Apparatus for processing digital image and method for controlling thereof - Google Patents

Abstract

PURPOSE: A device for processing digital image and a method for controlling thereof are provided to automatically control zoom level to photograph a subject in a set size. CONSTITUTION: An image input unit(310) receives input of input image. A zoom adjusting unit(380) controls zoom level of the input image. A control unit(320) controls the zoom level until a subject rate is coincide with a predetermined reference rate. The subject rate is relevant to a ratio of the subject area which the subject occupies in whole area of the input video.

Description

Apparatus for processing digital image and method for controlling Technical Field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital image processing apparatus and a control method thereof, and more particularly, to a digital image processing apparatus having a zoom function capable of photographing a distant subject in close proximity and a control method thereof.

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).

Typically, the digital image processing apparatus may have a zoom function. In this case, the zoom function may include a wide zoom function and a tele zoom function. The wide zoom function allows the field of view to be widened and the selected exposure area to be large. By the tele zoom function, the angle of view can be narrowed and the selected exposure area can be made small.

An object of the present invention is to provide a digital image processing apparatus capable of automatically adjusting a zoom level so that a subject can be photographed at a set size, and a control method thereof.

The present invention, the step of receiving an input image; Extracting a subject area from the input image; Calculating a ratio of a subject occupied by the subject region in the entire region of the input image; And zooming until the subject ratio substantially matches a preset reference ratio.

A subject included in the input image may be searched and a subject region occupied by the subject may be extracted from an entire region of the input image.

The zoom adjusting step may include comparing a ratio between the subject ratio and the reference ratio with a set reference value, adjusting a zoom level when the ratio difference is greater than the reference value, and receiving an input image by the zoom level. The method may include extracting a subject region from the input image, and calculating a ratio of a subject occupied by the subject region in the entire input image region.

The method may further include adjusting focus when the ratio difference is less than or equal to the reference value.

The method may further include displaying an input image input by the zoom level.

The input image may be displayed when the ratio difference is less than or equal to the reference value.

The adjusting of the zoom level may include zooming out when the subject ratio is greater than the reference ratio, and zooming in when the subject ratio is smaller than the reference ratio.

The method may further include setting the reference ratio, wherein the setting of the reference ratio may include selecting a reference photo and calculating a reference ratio corresponding to the ratio of the subject area occupied by the subject in the entire area of the reference photo. And storing the reference ratio.

Another aspect of the invention, the image input unit for receiving an input image; A zoom adjuster for adjusting a zoom level of the input image; And a controller configured to control the zoom level until the ratio of the subject corresponding to the ratio of the subject area occupied by the subject in the entire area of the input image substantially matches the preset reference ratio.

A subject included in the input image may be searched and a subject region occupied by the subject may be extracted from an entire region of the input image.

The zoom level may be adjusted until the ratio difference is less than or equal to the reference value by comparing the ratio difference between the subject ratio and the reference ratio with a preset reference value.

The apparatus may further include a focus adjusting unit configured to adjust focus when the ratio difference is smaller than or equal to the reference value.

The display apparatus may further include a display configured to display an input image input by the zoom level.

The zoom adjusting unit may include a zoom lens and a zoom driving unit driving the zoom lens to move the position of the zoom lens.

The zoom lens may be zoomed in when the subject ratio is smaller than the reference ratio, and the zoom lens may be zoomed out when the subject ratio is larger than the reference ratio.

The storage device may further include a storage unit configured to store a reference ratio corresponding to the ratio of the subject area occupied by the subject in the entire region of the reference photo.

According to the digital image processing apparatus and the control method thereof according to the present invention, it is possible to automatically adjust the zoom level so that the subject is photographed with a set size.

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

1 illustrates a rear surface 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, the display panel 25 and the like.

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.

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 an input image input by the set zoom level is displayed.

Meanwhile, a shutter release button 26, a flash (not shown), a power switch 28, and a lens unit (not shown) may be provided on the front or top surface of the digital camera 100. In addition, the front and rear of the digital camera 100 may be provided with an objective lens and an eyepiece of the viewfinder 27.

The shutter release button 26 and the power switch 28 may be included in a user manipulation unit (360 of FIG. 3) for inputting items to be manipulated by the user from the outside.

The shutter release button 26 is opened and closed to expose the film or an 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 26 can be pressed in two stages. When the shutter release button 26 is pressed in one end, the first signal S1 may be generated, and when the shutter release button 26 is pressed in one step, the second signal S2 may be generated. The shooting preparation setting may be performed by the first signal S1, and the shooting operation may be performed by the second signal S2.

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.

In this case, the zoom control may be performed by the zoom adjusting unit 380 of FIG. 3. The zoom adjusting unit 380 may include a zoom lens and a zoom driver. The zoom driver may include a zoom motor M _z and a lens driver 210 to drive the zoom lens to move the position of the zoom lens.

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 a 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 26 of 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 position of the focus lens which obtains the clearest image among the plurality of images is obtained.

For this purpose, the focus adjustment may be made by the focus adjusting unit 370 of FIG. 3. The focus adjuster 370 of FIG. 3 includes a focus lens and a focus driver, and may drive the zoom lens to move the position of the zoom lens. The focus driver may include a focus motor M _F and a lens driver 210 to drive the focus lens to move the position of the focus lens.

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 wide-angle zoom button W, a telephoto-zoom button T, 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 to temporarily store a reference ratio, a subject ratio, and an input image. 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 according to the present invention.

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; A focus adjuster 370; And a zoom adjusting unit 380.

The image input unit 310 receives an input image. The zoom controller 380 adjusts the zoom level of the input image. The controller 320 controls the zoom level until the subject ratio corresponding to the ratio of the subject area occupied by the subject in the entire area of the input image substantially matches the preset reference ratio.

The digital image processing apparatus 300 according to the present invention may capture an image with a size of a subject desired by a user. To this end, the zoom level may be automatically adjusted so that the subject can be photographed at a desired size with respect to the entire screen.

That is, the zoom level may be adjusted until the desired ratio of the subject to the entire screen is obtained so that the subject is photographed at a desired size. Therefore, the user can conveniently photograph the subject at a desired size.

In order to capture an image in a size of a subject desired by a conventional digital image processing apparatus, the user has to operate a zoom directly. However, in the present invention, the user sets the reference ratio, which is the ratio of the desired subject, in advance, and automatically operates the zoom level until the subject ratio of the input image becomes the reference ratio, thereby photographing the subject at a desired size for the entire image. Can be done.

Users who use digital cameras generally have a preferred subject size when taking pictures. Therefore, in order to adjust the size when the picture is taken, the zoom is operated by using the zoom in button or the zoom out button, so that the size of the subject is taken. In addition, sometimes people are asked to take pictures. At this time, the pictures taken by other people are not the size of the subject they want, and they are often disappointed.

However, according to the digital image processing apparatus 300 according to the present invention, it will be more convenient to take a picture of a subject in a desired size, and even when a picture is requested to another person, a more satisfactory picture may be obtained. .

The subject included in the input image input through the image input unit 310 may be searched to extract a subject region occupied by the subject from the entire region of the input image. In this case, when the subject is a human face, the human face becomes a subject, and the subject region may be extracted through face searching from the entire input image.

The controller 320 may control the zoom level until the subject ratio substantially matches the preset reference ratio. The subject ratio may be a ratio of a subject area occupied by the subject in the entire area of the input image.

The reference ratio may be a ratio of a subject area occupied by the subject in the entire area of the reference photo with respect to the selected reference photo. In this case, the reference picture may be a picture automatically selected by a user or by a system from among pre-photographed and stored pictures. The reference picture and / or the reference ratio may be stored in the storage units 330 and 340 in advance.

The controller 320 may compare the ratio between the ratio of the subject and the reference ratio with a preset reference value, and control and adjust the zoom level until the ratio is smaller than or equal to the reference value. In this case, when the subject ratio is smaller than the reference ratio, the zoom lens may be zoomed in. In addition, when the subject ratio is larger than the reference ratio, the zoom lens may be zoomed out.

Zoom adjustment may be made by the zoom adjustment unit 380. The zoom adjusting unit 380 may include a zoom lens and a zoom driver. The zoom driver may include a zoom motor (M _z of FIG. 2) and a lens driver (210 of FIG. 2) to drive the zoom lens to move the position of the zoom lens. In this case, the zoom level may be adjusted in preset step units.

In this case, when the ratio difference is less than or equal to the reference value, the input image input through the image input unit 310 may be an image to be photographed by the adjusted zoom level.

Meanwhile, the focus adjusting unit 370 of FIG. 3 may adjust the focus when the ratio difference is less than or equal to the reference value. In this case, the focus adjustment may be performed by normal auto focus adjustment. When the ratio difference is less than or equal to the reference value, the input image input through the image input unit 310 by the adjusted focus may be an image to be photographed.

In this case, the focus adjustment may be made by the focus adjusting unit 370. The focus adjuster 370 may drive the zoom lens so that the positions of the focus lens and the focus driver are moved. The focus driver may include a focus motor M _F and a lens driver 210 to drive the focus lens to move the position of the focus lens.

When the zoom is adjusted so that the ratio difference is smaller than or equal to the reference value, and the focus is adjusted with respect to the zoomed image, the image to which the input image input through the image input unit 310 is to be photographed by the adjusted zoom level and focus. Can be.

The zoom level may be adjusted by the first signal S1 generated by pressing the shutter release button 26 of FIG. 1 to one end. In addition, autofocus adjustment may be performed by the second signal S2 generated by pressing the shutter release button 26 of FIG. 1 in two steps.

The display unit 350 may display the input image in live view. In this case, each input image input by adjusting the zoom level may be displayed in live view. In another exemplary embodiment, an input image first input by the first signal S1 is displayed on the display unit 350, and an image based on a zoom level adjusted in the middle is not displayed on the display unit 350, and a subject having a desired size. The input image input by the zoom level adjusted to capture the image may be displayed on the display unit 350.

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; The control unit 320; Storage units 330 and 340; Display unit 350; A user manipulation unit 360; A focus adjuster 370; And the zoom adjusting unit 380 to automatically adjust the zoom so that the subject ratio becomes the reference ratio. 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 ratio, a subject ratio, an input image, and a captured image. The storage units 330 and 340 may include a first storage unit 330 and a second storage unit 340. In the first storage unit 330, a reference ratio, a subject ratio, and an input image may be temporarily stored. 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 a shutter release button 26 and a power switch 28 of FIG. 1 and / or a user input unit INP of FIG. 2.

According to the present invention, by adjusting the zoom level automatically so that the subject is photographed at the set size, user convenience in photographing the subject at the set size can be improved.

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 input image input step (S420); Extracting a subject region (S430); A subject ratio calculating step (S440); And zoom adjusting steps S450 to S460.

In the input image input step (S420), the input image is received. In the subject area extracting step (S430), the subject area is extracted from the input image. In the subject ratio calculating step (S440), the subject ratio occupied by the subject region in the entire region of the input image is calculated. In the zoom adjusting steps S450 to S460, the zoom is adjusted until the subject ratio substantially matches the preset reference ratio.

The control method (S400) of the digital image processing apparatus according to the present invention may capture an image with a size of a subject desired by a user. To this end, the zoom level may be automatically adjusted so that the subject can be photographed at a desired size with respect to the entire screen.

That is, the zoom level may be adjusted until the desired ratio of the subject to the entire screen is obtained so that the subject is photographed at a desired size. Therefore, the user can conveniently photograph the subject at a desired size.

The control method (S400) of the digital image processing apparatus according to the present invention may include a first signal input determination step (S405). In the first signal input determination step S405, it is determined whether the first signal S1 is input, and when it is determined that the first signal S1 is input, the zoom level is increased until the size of the subject becomes a desired size. I can adjust it.

In this case, the first signal S1 may be generated when the shutter release button 26 of FIG. 1 is pressed to one end. That is, when it is determined that the shutter release button 26 of FIG. 1 is pressed once and the first signal S1 is input, the zoom level may be adjusted until the size of the subject becomes a desired size.

In addition, the control method (S400) of the digital image processing apparatus may include determining a subject size adjusting function (S410). In the determining of the subject size adjustment function (S410), the current mode may be determined when the subject size adjustment function is ON, and may be performed when the subject size adjustment function is ON.

The subject size adjustment function is to adjust the zoom level until the subject ratio for the entire screen becomes a set reference ratio, so that the subject can be photographed at a desired size.

In the subject region extracting step (S430) of extracting a subject region from an input image, a subject included in the input image may be searched and a subject region occupied by the subject may be extracted from the entire region of the input image. In this case, when the subject is a human face, the human face becomes a subject, and the subject region may be extracted through face searching from the entire input image.

In the subject ratio calculating step S440, the subject ratio is calculated. The subject ratio may be a ratio of a subject area occupied by the subject in the entire area of the input image. The reference ratio may be a ratio of a subject area occupied by the subject in the entire area of the reference photo with respect to the selected reference photo.

In order to compare the subject ratio with the reference ratio, a separate reference ratio setting step (not shown) may be provided. The reference ratio setting step may include a reference picture selection step, a reference ratio calculation step, and a reference ratio storage step.

In the step of selecting a reference picture, a reference picture is selected. In this case, the reference picture may be a picture automatically selected by a user or by a system from among pre-photographed and stored pictures.

In the reference ratio calculating step, a reference ratio corresponding to the ratio of the subject area occupied by the subject in the entire region of the reference picture is calculated. In the reference ratio storage step, the reference ratio is stored. In this case, the reference picture and / or the reference ratio may be stored in a storage means such as a storage medium in advance.

In the zoom adjusting steps S450 to S460, the zoom is adjusted until the subject ratio substantially matches the preset reference ratio. The zoom adjustment steps S450 to S460 may include a subject ratio comparison step S450 and a zoom level adjustment step S460.

In the subject ratio comparison step (S450), the subject ratio is compared with the reference ratio. In the zoom level adjusting step (S460), the zoom level is adjusted until the subject ratio and the reference ratio are achieved.

To this end, in the subject ratio comparison step (S450), a ratio difference between the subject ratio and the reference ratio may be compared with a set reference value. In this case, the reference value may be 0 or a very small value close to zero. In the zoom level adjusting step S460, the zoom level may be adjusted until the ratio difference is smaller than or equal to the reference value.

In order to perform the zoom adjustment steps S450 to S460, an input image input step S420 until the subject ratio and the reference ratio are reached; Extracting a subject region (S430); The subject ratio calculating step S440 may be repeated.

In the input image input step (S420), the input image is input by the adjusted zoom level. In the subject region extracting step (S430), the subject region is extracted from the input image input by the adjusted zoom level. In the subject ratio calculating step (S440), the subject ratio occupied by the subject region in the entire region of the input image input by the adjusted zoom level is calculated.

The zoom level adjusting step S460 may include a zoom out step (not shown) and a zoom in step (not shown), and one of the steps may be performed according to the subject ratio. In the zoom out step, when the subject ratio is larger than the reference ratio, the camera zooms out. In the zoom-in step, the zoom-in is performed when the subject ratio is smaller than the reference ratio.

That is, in the zoom level adjusting step (S460), when the subject ratio is larger than the reference ratio, the camera zooms out and zooms in when the subject ratio is smaller than the reference ratio, thereby adjusting the zoom level until the subject ratio becomes the reference ratio. Done. At this time, a new input image is input by each changed zoom level, and a subject ratio is calculated by extracting a subject region with respect to the new input image.

The zoom adjustment steps S450 to S460 may be performed until the subject ratio and the reference ratio are determined by the newly calculated subject ratio.

The control method (S400) of the digital image processing apparatus according to the present invention may include a focus adjusting step S470. In the focus adjusting step S470, the focus is adjusted when the ratio difference is less than or equal to the reference value. In this case, the focus adjustment may be performed by normal auto focus adjustment. When the ratio difference is less than or equal to the reference value, the input image input by the adjusted focus may be an image to be photographed.

The control method (S400) of the digital image processing apparatus according to the present invention may include a display step (S480). In the display step S480, the input image input by the current zoom level may be displayed on the display unit 350 of FIG. 3.

In this case, the input image may be displayed in a live view. In this case, each input image input by adjusting the zoom level may be displayed in live view. In another embodiment, an input image first input by the first signal S1 is displayed, and an image by a zoom level adjusted in the middle is not displayed, but is input by a zoom level adjusted to capture a subject having a desired size. Only the input image may be displayed.

In this case, when the ratio difference is less than or equal to the reference value, the input image input by the adjusted zoom level may be an image to be photographed. In another embodiment, the zoom is adjusted so that the ratio difference is less than or equal to the reference value, and when the focus is adjusted with respect to the zoomed image, the input image input by the adjusted zoom level and focus may be an image to be photographed. Can be.

The control method (S400) of the digital image processing apparatus according to the present invention may include a second signal input determination step (S485). In operation S485, it may be determined whether the second signal S2 is input, and when it is determined that the second signal S2 is input, the photographing step S490 may be performed. In the photographing step S490, when the subject ratio is substantially the same as the reference ratio, the input image may be photographed.

In this case, the second signal S2 may be generated when the shutter release button 26 of FIG. 1 is pressed in two steps. That is, when it is determined that the shutter release button 26 of FIG. 1 is pressed in two steps and the second signal S2 is input, the input image of which the subject size is adjusted may be photographed.

As another embodiment, when it is determined that the second signal is input regardless of the input of the first signal S1, the subject size adjusting function determination step S410 to the photographing step S490 may be performed.

According to the present invention, by adjusting the zoom level automatically so that the subject is photographed at the set size, user convenience in photographing the subject at the set size can be improved.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and various modifications and equivalent other embodiments may be made by those skilled in the art. You will 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.

Claims (16)

Receiving an input image; Extracting a subject area from the input image; Calculating a ratio of a subject occupied by the subject region in the entire region of the input image; And And zooming until the subject ratio substantially matches a preset reference ratio. The method of claim 1, And searching for a subject included in the input image and extracting a subject region occupied by the subject from the entire region of the input image. The method of claim 2, The zoom adjustment step, Comparing the ratio difference between the subject ratio and the reference ratio with a set reference value, Adjusting a zoom level when the ratio difference is greater than the reference value, Receiving an input image based on the zoom level; Extracting a subject area from the input image, and And calculating a ratio of a subject occupied by the subject region in the entire input image region. The method of claim 3, And adjusting the focus when the ratio difference is less than or equal to the reference value. The method of claim 3, And displaying an input image input by the zoom level. The method of claim 5, And the input image is displayed when the ratio difference is less than or equal to the reference value. The method of claim 3, Adjusting the zoom level, Zooming out when the subject ratio is larger than the reference ratio, and And zooming in when the subject ratio is smaller than the reference ratio. The method of claim 1, And setting the reference ratio. The step of setting the reference ratio, Selecting a reference photo, Calculating a reference ratio corresponding to a ratio of the subject area occupied by the subject in the entire region of the reference photo, and And storing the reference ratio. An image input unit which receives an input image; A zoom adjuster for adjusting a zoom level of the input image; And And a controller configured to control the zoom level until a subject ratio corresponding to a ratio of a subject region occupied by a subject in the entire area of the input image substantially matches a preset reference ratio. 10. The method of claim 9, And searching for a subject included in the input image, and extracting a subject region occupied by the subject from the entire region of the input image. 10. The method of claim 9, And adjusting the zoom level until the ratio difference is less than or equal to the reference value by comparing the ratio difference between the subject ratio and the reference ratio with a set reference value. The method of claim 11, And a focus adjusting unit for adjusting focus when the ratio difference is less than or equal to the reference value. The method of claim 11, And a display unit which displays an input image input by the zoom level. 10. The method of claim 9, The zoom adjusting unit, A zoom lens, and And a zoom driver for driving the zoom lens to move the position of the zoom lens. The method of claim 14, And zooming in the zoom lens when the subject ratio is smaller than the reference ratio, and zooming out the zoom lens when the subject ratio is larger than the reference ratio. 10. The method of claim 9, And a storage unit configured to store a reference ratio corresponding to a ratio of a subject area occupied by a subject in the entire area of the reference photo with respect to the selected reference photo.

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