KR101566197B1 - Zooming apparatus for digital image processing apparatus and method thereof - Google Patents

Abstract

The present invention relates to a zoom driving apparatus and method for a digital image processing apparatus, and more particularly, to a zoom driving apparatus and method for zooming an image processing apparatus in which a change in size of a picked- And more particularly, to a zoom driving apparatus and method of a digital image processing apparatus in which a change in size of an image is constant.

Conventional image processing apparatuses operate by dividing a focal distance at an unconditional uniform interval through a pulse or an AD value, thereby changing the magnification ratio and magnification ratio of a captured object image at the n-th zooming stage, there is a problem that the ratio of the size of the captured object image at the (n + 1) -th stage changes.

The present invention provides a zoom driving apparatus and method of a digital image processing apparatus capable of constantly maintaining a rate of change in the size of a captured image of the conventional digital image processing apparatus.

Description

[0001] The present invention relates to a digital image processing apparatus, and more particularly,

The present invention relates to a zoom driving apparatus and method for a digital image processing apparatus, and more particularly to a zoom driving apparatus and method for zooming an image processing apparatus, And more particularly, to a zoom driving apparatus and method of a digital image processing apparatus in which a change in size of an image is constant.

The digital image processing apparatus includes all devices that process images of a digital camera, a PDA (personal digital assistant), a phone camera, a PC camera, or the like and use an image recognition sensor.

1 is a perspective view showing the front and upper contours of a digital camera as a digital image processing apparatus.

1, a digital camera 1 as a digital image processing apparatus according to the present invention includes a shutter release button 11, a flash 13, a subject lens 15a of a viewfinder, a power switch 17 And a lens unit 19 are provided.

The shutter release button 11 is opened and closed to expose the CCD or film to light for a predetermined time, and the image is recorded on the CCD by properly exposing the subject in cooperation with the aperture (not shown).

The flash 13 illuminates the bright light instantly when light is taken in a dark place. In the flash mode, there are automatic flash, forced flash, no flash, red-eye reduction, and slow synchro flash.

The objective lens unit 15a of the viewfinder is a small window of the camera for viewing the subject to be photographed and setting the composition.

FIG. 2 is a rear view showing a rear outer shape of the digital camera of FIG. 1;

2, an eyepiece portion 15b of the viewfinder, an upward movement button 21u, a downward movement button 21d, a leftward movement button 21l, and a rightward movement button 21d are provided at the rear of the digital camera 1 according to the present invention. A function button 21 including a movement button 21r and an OK button 21o, an exposure lock (AE Lock) button 23, an EVC button 25, a wide angle-zoom button 27w A telephoto-zoom button 27t, a color LCD panel 29, and a speaker SP.

The function button 21 is a key input for executing various menus related to the operation of the digital camera. Specifically, the function button 21 is a key used to activate or select an exposure area for controlling exposure or to move an exposure area. .

The exposure lock button 23 is input to fix the exposure of the image. When the exposure lock button 23 is input, the exposure is fixed at an exposure value suitable for the subject, and an AEL icon is displayed at the bottom of the color LCD panel 29. The exposure fixing button 23 can be set to enter a half-shutter state or a preview state to fix the exposure.

The EVC button (25) is used to adjust the exposure within the setting range (-2.0EV to + 2.0EV). It can adjust the sensitivity of the CCD, ie ISO, Can be adjusted.

The wide angle-zoom button 27w or the telephoto-zoom button 27t widens the angle of view or narrows the angle of view depending on the input, in particular, when changing the size of the selected exposure area. When the wide angle-zoom button 27w is input, the size of the selected exposure area is reduced, and when the telephoto-zoom button 27t is input, the size of the selected exposure area is increased.

Generally, a digital image processing apparatus is equipped with a zoom lens to arbitrarily reduce or enlarge an image of a subject to be photographed.

A zoom lens that performs zooming or zooming of a subject usually has a plurality of lens groups fixedly mounted on the barrel assembly, and the barrel assembly moves forward or backward with respect to the body of the image processing apparatus to perform a zoom operation by changing the lens magnification.

The zoom operation is normally performed by separately providing a wide angle-zoom button 27w or a tele-zoom button 27t on the body of the digital image processing apparatus. When the user presses any one of the switches, the driving motor is operated to move the barrel assembly forward or backward .

However, the conventional image processing apparatus has difficulty in adjusting the magnification of the user because the size of the image of the subject does not change when zooming, changing the magnification per unit time, or the like.

That is, in the conventional image processing apparatus, the focal distance is controlled to be unconditionally divided at regular intervals through a pulse or an AD value, so that the ratio of the image size of the subject at the n-th zooming stage and the zooming n + There is a problem that the ratio of the image size of the subject in the first stage changes.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide an image processing apparatus and method, in which the size change of a captured image at the time of one- It is an object of the present invention to provide a zoom driving apparatus and method for a digital image processing apparatus having a constant size change so that a user can more easily adjust a view angle and a composition and obtain a smooth zooming effect.

According to an aspect of the present invention, there is provided a zoom driving apparatus for a digital image processing apparatus, the apparatus comprising: A focal length adjusting unit for outputting a zooming stop position signal; A zoom lens unit including at least one lens body; And a lens driving unit for adjusting a stop position of the lens unit based on the zoom stop position signal outputted from the focal length adjusting unit.

Preferably, the zoom driving apparatus further includes a memory unit that stores a focal distance corresponding to a change in magnification of the image processing apparatus and a zoom stop position corresponding to the focal distance.

Preferably, the zoom driving apparatus further includes an imaging section for imaging the subject at a stop position of the adjusted lens section.

인것을 특징으로 한다.Preferably, the relationship of the zoom stop position corresponding to the focal length of the memory unit

.

Herein, z (n) is a zoom stop position at the n-th zooming stage of the digital image processing apparatus, fw is a focal length of the n-wide zoom zoom stage, and K is a zooming n- And N represents the maximum step of zooming.

Preferably, the magnification enlargement maximum step of the digital image processing apparatus

인것을 특징으로 한다.

.

Where N is the maximum step of zooming in the digital image processing apparatus, K is the rate of increase of the image captured at the n-th zooming stage, fw is the focal length of the n-th zoom- And fw represents the focal length of the zoom telephoto n-stage.

According to an aspect of the present invention, there is provided a zoom driving method of a digital image processing apparatus, which includes: maintaining a constant size change of a sensed image per unit time according to a magnification change of an image processing apparatus; A zoom stop position signal output step of outputting a zoom stop position signal; And a lens driving step of adjusting a stop position of the lens unit including at least one lens body based on the zoom stop position signal.

Preferably, the zoom driving method further includes the step of the photographer inputting the magnitude change rate K per unit time of the captured image.

Preferably, the zoom driving method further includes storing a focal distance corresponding to a change in magnification of the image processing apparatus and a zoom stop position corresponding to the focal distance.

Preferably, the relationship of the zoom stop position corresponding to the focal length is

인것을 특징으로 한다.

.

Herein, z (n) is a zoom stop position at the n-th zooming stage of the digital image processing apparatus, fw is a focal length of the n-wide zoom zoom stage, and K is a zooming n- And N represents the maximum step of zooming.

Preferably, the magnification enlargement maximum step of the digital image processing apparatus

인것을 특징으로 한다.

.

Where N is the maximum step of zooming in the digital image processing apparatus, K is the rate of increase of the image captured at the n-th zooming stage, fw is the focal length of the n-th zoom- And fw represents the focal length of the zoom telephoto n-stage.

According to the zoom driving apparatus and method of the digital image processing apparatus according to the present invention, the photographer or the user can more easily adjust the angle of view and the composition, and a smooth zooming effect of the image processing apparatus can be obtained.

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

3 is a diagram for explaining magnification of the digital image processing apparatus.

If the distance between the optical axis and the lens in FIG. 3 is the center of the lens (O), the distance between the object and the lens center is a, the distance between the center of the image and the lens is b, f, the following relationship is established between a, b, and f.

However, if a> 0 and the image is a real image, b> 0, f> 0, and if it is an imaginary image, a relationship of b is maintained.

On the other hand, when the size of the object is H and the size of the image is H ', the magnification of the image is expressed by the following equation (2).

The size of the image from Equation (2) can be derived from the relationship of Equation (3).

Therefore, the magnification of the digital image processing apparatus can be adjusted by changing the distance a between the subject and the lens center, the distance b between the image and the lens center.

However, in a general digital image processing apparatus, a magnification is adjusted by combining a plurality of lenses, and the final magnification is a result of multiplying the magnification of each lens.

4 is a diagram illustrating a digital image processing apparatus having a zoom function according to the present invention.

The image processing apparatus displays the image of the subject to be imaged selected by the enlargement magnification on the display section 200.

4, the enlargement magnification of the image of the subject also increases or decreases in accordance with the selection step of zooming.

That is, the subject image in the zooming n-1 stage may be displayed as a rectangle represented by 210, the subject image in the zooming n-th stage may be displayed as a rectangle represented by 220, Zooming The object image in the (n + 1) th stage is represented by a rectangle represented by 230. [

The zoom function of the digital image processing apparatus can be executed, for example, by operating a wide-angle zoom button (27w in FIG. 2) or a telephoto-zoom button (27t in FIG. 2).

When an image of a desired enlarged subject is displayed on the display unit 200, the user presses the shutter release button 11 of FIG. 1 to convert the captured image into image data, The image data is stored in the memory.

5 is a block diagram of a zoom driving apparatus of a digital image processing apparatus according to the present invention.

The zoom driving apparatus according to the present invention includes an operation unit 300, a memory unit 310, a focal length adjusting unit 320, a lens driving unit 330, a zoom lens unit 340, and an image pickup unit 350.

The operation unit 300 may include an operation unit including numeric keys and function keys, a side key, a touch panel, a handwriting input unit, a voice recognition unit, and the like, which are implemented as means for inputting an operation command of a photographer or a user.

The memory unit 310 may be implemented as a single chip of a static random access memory (SRAM) having a capacity of several megabits and a flash memory having a capacity of tens of megabits.

The memory unit 310 stores the zoom focal length and corresponding zooming control data (zoom stop position).

The focal length adjusting unit 320 receives zooming control data (zooming) corresponding to the zoom focal length of the zoom lens unit 340 when the zoom magnification stage (n stage) of the image processing apparatus input from the operation unit 300 is input, Stop position) from the memory unit 310 and outputs it to the lens driving unit 330. [

The zoom lens unit 340 includes a zoom lens for controlling the angle of view to be narrowed or widened according to the focal length, and a focus lens for focusing the subject. These lenses may be each composed of one lens, It can also be made up of communities.

The image sensing unit 350 converts an optical signal transmitted through the zoom lens unit 340 into an electrical signal, and can be implemented as a CMOS image sensor or a CCD image sensor.

The lens driving unit 330 outputs power input from a power supply unit (not shown) that supplies power to the digital image processing apparatus to the lens unit to drive the lens unit 340 of the image processing apparatus.

FIG. 6 is a diagram illustrating a relationship between a focal length of the zoom driving device and zooming control data (zoom stop position) in the digital image processing apparatus according to the present invention.

The digital image processing apparatus is to enlarge from the n-th zooming stage to the (n + 1) -th zooming stage as shown in Fig. 4 as an embodiment.

 Zooming Zooming in the n-th stage If the magnification is increased by K times in the (n + 1) th stage, the relationship shown in Equation 4 should be maintained from the diagram shown in Fig.

Zooming Zooming in the n-th stage The specific increase rate of K, which is terminated in the (n + 1) th stage, may be directly selected by the user through the operation unit 300 of FIG. 5, May be selected according to the program.

The relationship of the expression (4) is converted into the expression concerning the focal distance, thereby satisfying the relation of the expression (5).

The zoom focal length and the corresponding zoom stop position relationship in the zoom driving apparatus and method of the digital image processing apparatus in which the change in magnification at the time of Zoom step change is constant and the change in magnification per unit time is constant is derived from Equation (6).

Here, z (n) represents the zoom stop position at the nth stage of zooming, fw represents the focal length of the zoom wide n stage, and N represents the maximum step of zooming.

The conversion of the focal length to a mechanical zooming position function can be achieved by changing the zoom position, Which is essential for the lens-related data of the focal length.

The maximum value N of the zooming can be obtained from Equation (7).

Here, N represents the maximum step of zooming, fw represents the focal length of the zoom wide n stage, and ft represents the focal length of the zoom telephoto n stage.

Zooming of Image Processing Apparatus According to the Present Invention The size variation of a captured image at the time of one-end change is constant, and a change in the size of an image captured per unit time is constant.

Therefore, the magnification speed of the picked-up image at the n-th zooming stage can be obtained from the equation (8).

Here, Z (n + 1) is the zoom stop position at the n-th zooming stage, Z (n) is the zoom stopping position at the n-th zooming stage, t is the zoom- It represents time.

Zooming Zooming can be performed by the user directly through the operation unit 300 of FIG. 3, or may be selected according to the program set in the digital image processing apparatus.

7 is a flowchart illustrating a zoom driving method of a digital image processing apparatus according to the present invention.

The photographer or the user can input an enlargement ratio (input of K value in Equation 5) of the input subject image through an operation unit including a numeric key, a function key, or the like (S710). The input by the user of the K value is not essential and may be automatically selected according to the set program of the digital image processing apparatus.

The memory unit 310 of FIG. 5 stores the zoom focal length and corresponding zooming control data (zoom stop position) (S720).

5) of the zooming stop position corresponding to the zoom focal length of the image enlarged by K times the image of the subject at the zoom magnification stage selected by the photographer, 310) and outputs it to the lens driver 330 (FIG. 5) (S730).

The lens driving unit (330 in FIG. 5) outputs power input from a power supply unit (not shown) that supplies power to the digital image processing apparatus to the lens unit to drive the zoom lens unit (340 in FIG. 5) of the image processing apparatus. (S740)

The image sensing unit 350 in FIG. 5 converts the optical signal transmitted through the zoom lens unit 340 (FIG. 5) into an electrical signal, and may be implemented as a CMOS image sensor or a CCD image sensor in operation S750.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

1 is a perspective view showing the front and upper contours of a digital camera as a digital image processing apparatus.

FIG. 2 is a rear view showing a rear outer shape of the digital camera of FIG. 1;

3 is a diagram for explaining magnification of the digital image processing apparatus.

4 is a diagram illustrating a digital image processing apparatus having a zoom function according to the present invention.

5 is a block diagram of a zoom driving apparatus of a digital image processing apparatus according to the present invention.

FIG. 6 is a diagram illustrating a relationship between a focal length of the zoom driving device and zooming control data (zoom stop position) in the digital image processing apparatus according to the present invention.

7 is a flowchart illustrating a zoom driving method of a digital image processing apparatus according to the present invention.

Claims (10)

A zoom stop position signal for outputting a zoom stop position signal to maintain a constant size change per unit time of a captured image according to a change in magnification in which a magnification increase rate at the time of one-end zoom conversion of the image processing apparatus is kept constant, ; A zoom lens unit including at least one lens body; And And a lens driving unit for adjusting a stop position of the lens unit based on the zoom stop position signal output from the focal length adjusting unit. The method according to claim 1, And a memory unit for storing a focal distance corresponding to a change in magnification of the image processing apparatus and a zoom stop position corresponding to the focal distance. The method according to claim 1, And an image pickup unit for picking up an image of a subject at a stop position of the adjusted lens unit. 3. The zoom lens according to claim 2, wherein the zoom stop position corresponding to the focal length

And the zooming operation of the digital image processing apparatus. Herein, z (n) is a zoom stop position at the n-th zooming stage of the digital image processing apparatus, fw is a focal length of the n-wide zoom zoom stage, and K is a zooming n- And N represents the maximum step of zooming. 5. The digital image processing apparatus according to claim 4, wherein the magnification enlargement maximum step of the digital image processing apparatus

And the zooming operation of the digital image processing apparatus. Where N is the maximum step of zooming in the digital image processing apparatus, K is the rate of increase of the image captured at the n-th zooming stage, fw is the focal length of the n-th zoom- And fw represents the focal length of the zoom telephoto n-stage. A zoom stop position for outputting a zoom stop position signal to maintain a constant size change per unit time of a picked up image in accordance with a change in magnification in which a magnification increase rate at the time of one-end zoom conversion of the image processing apparatus is kept constant, A signal output step; And And a lens driving step of adjusting a stop position of a lens unit including at least one lens body based on the zoom stop position signal. The method according to claim 6, Further comprising the step of the photographer inputting the magnitude change rate K per unit time of the captured image. The method according to claim 6, Further comprising: storing a focal distance corresponding to a change in magnification of the image processing apparatus and a zoom stop position corresponding to the focal distance. The zoom lens according to claim 8, wherein the zoom stop position corresponding to the focal length

Wherein the zoom driving method of the digital image processing apparatus comprises: Herein, z (n) is a zoom stop position at the n-th zooming stage of the digital image processing apparatus, fw is a focal length of the n-wide zoom zoom stage, and K is a zooming n- And N represents the maximum step of zooming. The digital image processing apparatus according to claim 9, wherein the magnification enlargement maximum step of the digital image processing apparatus

Wherein the zoom driving method of the digital image processing apparatus comprises: Where N is the maximum step of zooming in the digital image processing apparatus, K is the rate of increase of the image captured at the n-th zooming stage, fw is the focal length of the n-th zoom- And fw represents the focal length of the zoom telephoto n-stage.

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