KR20100084835A - Apparatus and method for digital picturing image - Google Patents

Abstract

PURPOSE: A digital image processing apparatus and a control method thereof are provided to automatically filter blurred results during continuous photographing, thereby improving user's convenience. CONSTITUTION: An image processor(125) performs signal processing to display digitally converted RAW data. The image processor removes a black level due to a dark current. The image processor performs gamma compensation. A digital signal processor(129) extracts high frequency components of images obtained through the continuous photographing. The digital signal processor determines whether the high frequency components of each image are more than a fixed reference. The digital signal processor stores only images with high frequency components more than the fixed reference.

Description

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

The present invention relates to a digital image processing apparatus and a method of controlling the same, and more particularly, to a digital image processing apparatus and a method of controlling the same, which filters blurry results during continuous shooting.

In general, a digital image processing apparatus includes any apparatus that processes an image such as a digital camera, a personal digital assistant (PDA), a phone camera, a PC camera, or uses a motion recognition sensor. The digital image processing apparatus receives a desired image through the image pickup device, displays the input image on the image display device, displays the image, saves the image as an image file according to the user's shooting selection, and prints the stored image file.

Such digital image processing apparatuses are generally equipped with a continuous shooting function. Continuous shooting is a function of shooting images continuously while pressing the shutter-release button. Recently, a digital image processing apparatus capable of continuously shooting up to 60 times per second has been developed.

When continuous shooting is performed using the continuous shooting function, there are a number of blurred pictures due to the movement of the subject, camera shake or focus mismatch.

However, since the conventional digital image processing apparatus does not have a function of automatically filtering the blurred images, it is inconvenient for the user to manually delete the blurred images by the digital image processing apparatus or the PC. Was present.

An object of the present invention is to provide a digital image processing apparatus and a control method thereof for automatically filtering blurry results during continuous shooting.

The present invention provides a digital image processing apparatus having a continuous shooting function, and extracts high frequency components of a plurality of images acquired through one continuous shooting to determine whether the extracted high frequency components are above a predetermined standard. It provides a digital image processing apparatus, characterized in that the determination.

In the present invention, the images in which the extracted high frequency component is below a predetermined reference may be deleted.

In the present invention, the images of which the extracted high frequency component is below a predetermined reference may be stored in a separate storage area.

In the present invention, the determination of whether the high frequency component of each of the extracted images is greater than or equal to a predetermined reference may determine whether the absolute value of the high frequency component of the extracted image is greater than or equal to a predetermined reference value.

In the present invention, it is determined whether the high frequency component of each of the extracted images is greater than or equal to a predetermined reference value. It can be determined whether it is within the rank.

In the present invention, the determination of whether or not the high frequency component of each of the extracted images is greater than or equal to a predetermined criterion,

It may be determined whether a high frequency component value of the extracted image corresponds to a predetermined ratio or more among high frequency component values of all images acquired through the single continuous shooting.

In the present invention, a high pass filter may be used to extract high frequency components of the plurality of images.

In the present invention, the predetermined criteria may be changeable.

According to another aspect of the present invention, there is provided a control method of a digital image processing apparatus having a continuous shooting function, the method comprising: defining a reference high frequency component; Performing continuous shooting; Extracting high frequency components of a plurality of images acquired through the continuous shooting; And determining whether the extracted high frequency component is greater than or equal to the reference high frequency component.

In the present invention, after determining whether the extracted high frequency component is greater than or equal to the reference high frequency component, the method may further include deleting an image in which the extracted high frequency component is less than or equal to the reference high frequency component.

In the present invention, after determining whether the extracted high frequency component is greater than or equal to the reference high frequency component, the method may further include storing an image in which the extracted high frequency component is less than or equal to the reference high frequency component in a separate storage area.

In the present invention, the step of determining whether the extracted high frequency component is greater than or equal to the reference high frequency component may determine whether the extracted high frequency component value is greater than or equal to a predetermined reference value.

In the present invention, determining whether the extracted high frequency component is greater than or equal to the reference high frequency component comprises: whether the extracted high frequency component value is within a predetermined equality among high frequency component values of all images acquired through the single continuous shooting. Can be determined.

In the present invention, the step of determining whether the extracted high frequency component is equal to or greater than the reference high frequency component may include extracting the high frequency component value to a predetermined ratio or more from the high frequency component values of the entire images obtained through the single continuous shooting. It can be determined whether or not applicable.

In the present invention, the extracting the high frequency components of the plurality of images obtained through the continuous shooting may be performed using a high pass filter.

In the present invention, the reference high frequency component may be changeable.

According to the present invention, it is possible to obtain an effect of improving user convenience by filtering out blurry results automatically during continuous shooting.

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

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

The shutter-release button 101 opens and closes to expose the CCD or film to light for a predetermined time, and records the image on the CCD by properly exposing the subject in conjunction with an aperture (not shown).

The shutter-release button 101 generates first and second image capturing signals by a photographer input. When the first shutter-release signal as the half-shutter signal is input, the digital image processing apparatus 100 focuses and adjusts the amount of light, and when the focus is achieved, the display unit (see 113 in FIG. 2) turns green. Will be turned on. When focus is achieved by the input of the first shutter-release signal and the amount of light is adjusted, the second shutter-release signal as a full-shutter signal is input to capture an image.

The power button 103 is input to supply power to and operate the digital image processing apparatus.

The flash 105 brightens the bright light instantly when shooting in a dark place. The flash mode includes auto flash, forced flash, flash off, red-eye reduction, and slow synchro.

The auxiliary light 107 supplies light to the subject so that the digital image processing apparatus automatically focuses quickly and accurately when the amount of light is insufficient or at night.

The lens unit 109 receives light from an external light source and processes an image.

FIG. 2 is a rear view of the rear surface of the digital image processing apparatus shown in FIG. 1, wherein the wide-angle zoom button 111w, the telephoto-zoom button 111t, the display unit 113, and a touch sensor or a contact switch are installed. The provided input buttons B1 to B14 (hereinafter referred to as buttons B1 to B14) are provided.

The wide-angle zoom button 111w or the tele-zoom button 111t increases the angle of view or narrows the angle of view according to an input, particularly when the size of the selected exposure area is to be changed. When the wide-zoom button 111w is input, the size of the selected exposure area is reduced, and when the tele-zoom button 111t is input, the size of the selected exposure area is increased.

The buttons B1 to B14 are provided in the horizontal column and the vertical column of the display unit 113. The buttons B1 to B14 provided in the horizontal and vertical columns of the display 113 are provided with a touch sensor (not shown) or a contact switch (not shown).

That is, the buttons B1 to B14 are provided with a touch sensor and move up / down / left / right in a state where the buttons B1 to B7 in the horizontal row or the buttons B8 to B14 in the vertical row are touched. Any value of the item (eg, color or brightness) may be selected or a submenu icon included in the main menu icon may be activated.

In addition, the buttons B1 to B14 are provided with contact switches so that the corresponding function can be executed by directly selecting the main menu icon and the submenu icon. The touch sensor requires only a weak touch relative to the contact switch input, but the contact switch input requires a relatively strong touch compared to the touch sensor input.

3 is a block diagram showing the configuration of the digital image processing apparatus illustrated in FIGS. 1 and 2, wherein the display unit 113, the user input unit 121, the imaging unit 123, the image processing unit 125, and the storage unit ( 127 and a digital signal processor 129.

The user input unit 121 may open and close the shutter-release button 101 to expose the CCD or the film to light for a predetermined time, the power button 103 to input power, and widen the angle of view according to the input, Wide-Zoom button (111w) and Tele-Zoom button (111t) for narrowing the angle of view, and a touch sensor or contact switch provided in the horizontal and vertical columns around the display unit 113 for text or menu settings There are buttons B1 to B14.

The imaging unit 123 includes a shutter, a lens unit, an aperture, a charge coupled device (CCD), and an analog-to-digital converter (ADC), which are not shown in the figure. The shutter is a mechanism for adjusting the amount of light exposed together with the aperture. The lens unit receives light from an external light source and processes an image. At this time, the iris adjusts the amount of light (light quantity) incident on the degree of opening and closing. The opening and closing degree of the iris is controlled by the digital signal processing unit 129.

The CCD accumulates the amount of light input through the lens unit and outputs an image captured by the lens unit in accordance with the accumulated light amount in accordance with the vertical synchronization signal. Image acquisition of the digital image processing apparatus is performed by a CCD that converts light reflected from a subject into an electrical signal. In order to obtain a color image using a CCD, a color filter is required, and most of them employ a filter (not shown) called a color filter array (CFA). CFA has a structure arranged regularly by passing only one color light per pixel, and has various shapes according to the arrangement structure. The ADC converts an analog video signal output from the CCD into a digital signal.

The image processor 125 processes the signal to display the digitally converted RAW data. The image processor 125 removes the black level due to the dark current generated by the CCD and the CFA filter that are sensitive to the temperature change. The image processor 125 performs gamma correction for encoding information according to nonlinearity of human vision. The image processor 125 performs CFA interpolation to interpolate the Bayer pattern implemented by the RGRG line and the GBGB line of the gamma corrected predetermined data into the RGB line. The image processing unit 125 converts the interpolated RGB signal into a YUV signal, sharpens the image by filtering the Y signal by a high band filter, and uses the standard color coordinate system to adjust the color values of the U and V signals. Perform color correction to correct and remove their noise. The image processor 125 compresses and signals the Y, U, and V signals from which the noise is removed to generate a JPEG file, and the generated JPEG file is displayed on the display unit 113 and stored in the storage unit 127. . All of the operations of the image processor 125 operate under the control of the digital signal processor 129.

The digital signal processor 129 includes a high frequency component extractor 129a and a controller 129b, and extracts high frequency components of a plurality of images acquired through continuous shooting, so that the high frequency components of each image are equal to or greater than a predetermined reference. It determines whether or not, and stores only the images of which the high frequency component is more than a predetermined reference.

In detail, when the continuous shooting is performed using the continuous shooting function, there are a number of blurred pictures due to the movement of the subject, the camera shake, or the focus mismatch. However, in the conventional digital image processing apparatus, since the function of automatically filtering the blurred images is not provided, it is inconvenient for the user to manually delete the blurred images manually from the digital image processing apparatus or the PC. Existed.

In order to solve such a problem, the digital image processing apparatus 100 according to the exemplary embodiment of the present invention is characterized in that it automatically filters blurry results during continuous shooting.

To this end, the high frequency component extractor 129a extracts high frequency components of a plurality of images obtained through one continuous shooting under the control of the controller 129b. Referring to FIG. 4, which is a graph sequentially showing high frequency components extracted from a plurality of images photographed during continuous shooting, even if the same subject is photographed at the same position, the high frequency components of each image may be different. That is, the high frequency components of each image are changed by a certain amount due to the movement of the subject, camera shake, or focus mismatch. In FIG. 4, the high frequency components of the image b are the highest, followed by the high frequency components in the order of d, e, c, and a.

In this case, a high pass filter is generally used for the high frequency component extractor 129a to extract the high frequency component from the images. A high pass filter that passes only high frequencies, but only low frequencies, a low pass filter that only passes low frequencies, and a low pass filter that only passes certain frequencies but blocks both. Band pass filters, band rejection filters that block only certain frequencies and pass them all, and all pass filters that change phases without changing amplitudes do. In the present invention, since only the clearer and clearer images must be selected, a high pass filter that generally passes only a high frequency and blocks a low frequency may be used, but the spirit of the present invention is limited thereto. It is not.

As such, when the high frequency component extractor 129a extracts the high frequency components from the plurality of images, the controller 129b determines whether the high frequency components of the respective images are equal to or greater than a predetermined reference value.

Here, the predetermined criterion may be an absolute criterion or a relative criterion. That is, all images having a high frequency component value less than or equal to a predetermined reference high frequency component value may be deleted, or all images having a predetermined ratio (or a predetermined equal number) may be deleted.

First, suppose that an absolute standard is set as the predetermined criterion. For example, when a predetermined criterion is set to 3000000, a, c, d, and e having a high frequency component value of 3000000 or less among five images of a to e shown in FIG. 4 will be deleted, and only b will be stored. On the other hand, if the predetermined criterion is set to 2700000, a having a high frequency component value of 2700000 or less among the five images of a to e shown in FIG. 4 will be deleted, and b, c, d, and e will be stored. This absolute reference value may be preset by the manufacturer, and the photographer may then change it as needed.

Next, suppose a case where a relative reference is set as the predetermined criterion. For example, if the predetermined criterion is set to the top 40%, only b and d within the top 40% of the five images of a to e shown in FIG. Stored, and the remaining a, c, and e will be deleted. On the other hand, when the predetermined criterion is set to the upper 60%, the high-frequency component value among the five images of a ~ e shown in Figure 4 is the upper 60%, that is, b, c, d in the third of the five images Will be stored and the remaining a, e will be deleted. On the other hand, a predetermined criterion may be set to the top 4 positions irrespective of the total number of images. In this case, among the five images of a to e shown in FIG. d, e will be stored and the remaining a will be deleted. This relative reference value may also be preset by the manufacturer, and the photographer may then change it as needed.

Herein, the controller 129b may delete images below the predetermined reference. Alternatively, the controller 129b may move the images below the predetermined reference to a separate location and manage them separately. That is, the image above the predetermined reference may be automatically stored, and the image below the predetermined reference may be checked by the user one by one to determine whether to delete the image.

According to the present invention, it is possible to obtain an effect of improving user convenience by filtering out blurry results automatically during continuous shooting.

Next, a digital image processing method according to the present invention will be described in detail with reference to FIG. 5. The image processing method according to the present invention may be performed inside the image processing apparatus as shown in FIG. 3. Can be performed internally.

Referring to FIG. 5, in the control method of the digital image processing apparatus according to the present invention, a step of defining a reference high frequency component (step S110), a step of performing continuous shooting (step S120), and a plurality of images obtained through the continuous shooting Extracting a high frequency component of the two images (step S130), determining whether the extracted high frequency component is equal to or greater than the reference high frequency component (step S140), and when the extracted high frequency component is equal to or greater than the reference high frequency component, And storing the image (step S150) and deleting the corresponding image when the extracted high frequency component is equal to or less than the reference high frequency component (step S160).

This will be described in more detail as follows.

First, a reference high frequency component is defined (step S110). Here, the reference high frequency component may be an absolute reference or a relative reference. That is, all images having a high frequency component value less than or equal to a predetermined reference high frequency component value may be deleted, or all images having a predetermined ratio (or preset equality) may be deleted. These reference high frequency components may be set in advance by the manufacturer, and the photographer may then change them as necessary.

Next, continuous shooting is performed (step S120) and high frequency components of a plurality of images acquired through the continuous shooting are extracted (step S130). That is, high frequency components of a plurality of images acquired through one continuous shooting are extracted. Referring to FIG. 4, which is a graph sequentially showing high frequency components extracted from a plurality of images photographed during continuous shooting, even if the same subject is photographed at the same position, the high frequency components of each image may be different. That is, the high frequency components of each image are changed by a certain amount due to the movement of the subject, camera shake, or focus mismatch. In FIG. 4, the high frequency components of the image b are the highest, followed by the high frequency components in the order of d, e, c, and a.

In this case, a high pass filter is generally used to extract high frequency components from the images. In the present invention, since only the clearer and clearer images must be selected, a high pass filter that generally passes only a high frequency and blocks a low frequency may be used, but the spirit of the present invention is limited thereto. It is not.

Next, it is determined whether the extracted high frequency component is equal to or greater than the reference high frequency component (step S140). If the extracted high frequency component is equal to or greater than the reference high frequency component, the corresponding image is stored (step S150). If the extracted high frequency component is equal to or less than the reference high frequency component, the corresponding image is deleted (step S160).

First, suppose that an absolute standard is set as the predetermined criterion. For example, when a predetermined criterion is set to 3000000, a, c, d, and e having a high frequency component value of 3000000 or less among five images of a to e shown in FIG. 4 will be deleted, and only b will be stored. On the other hand, if the predetermined reference is set to 2700000, a having a high frequency component value of 2700000 or less among the five images of a to e shown in FIG. 4 will be deleted, and b, c, d, and e will be stored. This absolute reference value may be preset by the manufacturer, and the photographer may then change it as needed.

Next, suppose a case where a relative reference is set as the predetermined criterion. For example, if the predetermined criterion is set to the top 40%, only b and d within the top 40% of the five images of a to e shown in FIG. Stored, and the remaining a, c, and e will be deleted. On the other hand, when the predetermined criterion is set to the upper 60%, the high-frequency component value among the five images of a ~ e shown in Figure 4 is the upper 60%, that is, b, c, d in the third of the five images Will be stored and the remaining a, e will be deleted. On the other hand, a predetermined criterion may be set to the top 4 positions irrespective of the total number of images. In this case, among the five images of a to e shown in FIG. d, e will be stored and the remaining a will be deleted. This relative reference value may also be preset by the manufacturer, and the photographer may then change it as needed.

Here, in FIG. 5, the images below the predetermined reference are described as being deleted, but the inventive concept is not limited thereto. That is, the images below the predetermined reference may be moved to separate locations and managed separately. In other words, images above a predetermined reference may be automatically stored, and the images below the predetermined reference may be checked by the user one by one to determine whether to delete the images.

Next, it is determined whether it was the last image among a plurality of images acquired through one continuous shooting (step S170). As a result of the determination, if it is not the last image, step S140 or less is repeated.

According to the present invention, it is possible to obtain an effect of improving user convenience by filtering out blurry results automatically during continuous shooting.

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

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

FIG. 2 is a rear view illustrating a rear shape of the digital image processing apparatus illustrated in FIG. 1.

3 is a block diagram illustrating a configuration of the digital image processing apparatus illustrated in FIGS. 1 and 2.

4 is a graph sequentially showing high frequency components extracted from a plurality of images photographed during continuous shooting.

5 is a flowchart illustrating a control method of a digital image processing apparatus according to the present invention.

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

100: digital image processing apparatus 121: user input unit

123: imaging unit 125: image processing unit

127: storage unit 129: digital signal processing unit

129a: high frequency component extraction unit 129b: control unit

Claims (16)

In the digital image processing apparatus having a continuous shooting function, And extracting high frequency components of a plurality of images acquired through one continuous shooting to determine whether the extracted high frequency components are equal to or greater than a predetermined reference value. The method of claim 1, And the images having the extracted high frequency component below a predetermined reference are deleted. The method of claim 1, And the images having the extracted high frequency component below a predetermined reference are stored in a separate storage area. The method of claim 1, The determination of whether or not the high frequency component of each of the extracted images is equal to or greater than a predetermined reference value, And determining whether an absolute value of the high frequency component of the extracted image is greater than or equal to a predetermined reference value. The method of claim 1, The determination of whether or not the high frequency component of each of the extracted images is equal to or greater than a predetermined reference value, And determining whether a high frequency component value of the extracted image is within a predetermined equality among high frequency component values of all images acquired through the single continuous shooting. The method of claim 1, The determination of whether or not the high frequency component of each of the extracted images is equal to or greater than a predetermined reference value, And determining whether a high frequency component value of the extracted image corresponds to a predetermined ratio or more among high frequency component values of the entire images acquired through the single continuous shooting. The method of claim 1, And a high pass filter to extract high frequency components of the plurality of images. The method of claim 1, And the predetermined criterion is changeable. In the control method of the digital image processing apparatus having a continuous shooting function, Defining a reference high frequency component; Performing continuous shooting; Extracting high frequency components of a plurality of images acquired through the continuous shooting; And And determining whether the extracted high frequency component is greater than or equal to the reference high frequency component. The method of claim 9, After determining whether the extracted high frequency component is equal to or greater than the reference high frequency component, And deleting the image in which the extracted high frequency component is equal to or less than the reference high frequency component. The method of claim 9, After determining whether the extracted high frequency component is equal to or greater than the reference high frequency component, And storing the extracted high frequency component having an image equal to or less than the reference high frequency component in a separate storage area. The method of claim 9, Determining whether the extracted high frequency component is equal to or greater than the reference high frequency component, And determining whether the extracted high frequency component value is equal to or greater than a predetermined reference value. The method of claim 9, Determining whether the extracted high frequency component is equal to or greater than the reference high frequency component, And determining whether the extracted high frequency component value is within a predetermined level among high frequency component values of all images acquired through the single continuous shooting. The method of claim 9, Determining whether the extracted high frequency component is equal to or greater than the reference high frequency component, And determining whether the extracted high frequency component value corresponds to a predetermined ratio or more of high frequency component values of the entire images obtained through the single continuous shooting. The method of claim 9, Extracting the high frequency components of the plurality of images obtained through the continuous shooting, characterized in that using a high pass filter (high pass filter) control method of the digital image processing apparatus. The method of claim 9, And the reference high frequency component is changeable.

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