KR20090102431A - Digital image processing apparatus which display the degree of image blurring and the controlling method of the same - Google Patents

Abstract

PURPOSE: A digital image processing apparatus and a control method displaying the shake of an image are provided to store information displaying the shake degree of the image and determine the shake degree of the photographed image. CONSTITUTION: A digital image processing apparatus includes a hand shaking correction module(250). The hand shaking correction module senses the vibration of hand of a user. The hand shaking correction module amends the vibration of hand. In the photographed image, an extent is determined it shakes of an image by the vibration of hand of a user. The image in which it shows an extent it shakes is indicated on a display screen(262).

Description

Digital image processing apparatus which display the degree of image shake and its control method {Digital image processing apparatus which display the degree of image blurring and the controlling method of the same}

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 and a control method including a function of determining a degree of shaking of a captured image having a camera shake correction module.

The digital image processing apparatus is a device for capturing an image of a subject, and thus, various digital image processing apparatuses such as a digital camera and a camcorder can be easily accessed. These digital image processing devices have been developed a number of technologies to enable users to take pictures or videos that can satisfy the maximum.

Recently, when a user takes a picture of a subject by hand, a technology for removing an image from being shaken by a user's hand has been developed and applied to a digital image processing apparatus. The image stabilization technique is a technique for detecting minute shaking of the digital image processing apparatus from a sensor such as a gyro sensor and finely adjusting the position of a lens or an image pickup device included in the digital image processing apparatus according to the detected signal. to be. By adjusting the position of the lens or the image pickup device, even if the digital image processing apparatus main body is shaken, the relative position of the lens or image pickup device that generates the image does not change, thereby reducing image shake.

However, depending on the user, not only the degree of hand shake is severe but also the digital image processing device is often shaken because the breath-release button is not stopped when the shutter-release button is pressed. In addition, if the user is using a means of transportation, such as a car or subway, even if there is no hand shake, trembling will inevitably occur due to the shaking of the car or the subway itself. In such a case, the image shake cannot be prevented even by the above-mentioned image stabilization technique.

As a result, in the case of a severely shaken image, the user deletes it from a storage medium such as a removable memory. The only way to check whether the image is shaken is to enlarge and check the image that is photographed in the playback mode. However, it is inconvenient for the user to check the photographed images one by one.

Therefore, there is a need for a technology that provides a method for a user to easily determine whether an image is shaken.

It is an object of the present invention to provide a digital image processing apparatus and a control method thereof, by which a user can easily determine a degree of shaking of an image due to hand shake in a captured image.

In order to solve the above technical problem, the first aspect of the present invention is a digital image processing apparatus having a hand shake correction module for detecting the hand shake to correct the hand shake, the image by the hand shake of the user in the captured image And determining the degree of shaking and displaying an image indicating the amount of shaking on a display screen.

In the present invention, the image indicating the shaking degree can be displayed on the display screen in the OSD method.

In the present invention, the image indicating the degree of shaking can be displayed on the display screen by synthesizing with the quick-view image or the playback image of the captured image.

In the present invention, the image indicating the degree of shaking may use any one of numbers, graphs or alphabets.

In addition, in the present invention, the information indicating the shaking degree can be stored in the Exif header.

In order to solve the above technical problem, the second aspect of the present invention is a control method of a digital image processing apparatus comprising a hand shake correction module for correcting the hand shake by detecting a hand shake of the user, (a) shake of the captured image Determining a degree, (b) generating an image file including the information indicating the amount of shaking in an Exif header, (c) generating an image indicating the amount of shaking using the information indicating the amount of shaking, and (d) providing a control method of a digital image processing apparatus, comprising displaying the generated image.

As such, the user determines the shaking degree of the captured image, stores the information indicating the shaking degree of the image in the attribute information area of the Exif header, calls it, and displays it as a quick-view image or a playback image. It is easy to know whether the recorded image is severely shaken.

1 (a) and 1 (b) are diagrams illustrating an external configuration of a digital image processing apparatus according to an embodiment of the present invention.

2 is a diagram illustrating an internal configuration of a digital image processing apparatus according to an embodiment of the present invention.

3 is a diagram illustrating a state in which an image shake is displayed on a display screen according to an embodiment of the present invention.

4 is a diagram illustrating a state in which an image shake is displayed on a display screen according to another exemplary embodiment of the present invention.

5 (a) and 5 (b) are flowcharts illustrating a control method of a digital image processing apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments will be described in more detail with reference to FIGS. 1A through 5B.

1 (a) is a perspective view of a digital image processing apparatus according to an embodiment of the present invention, Figure 1 (b) is a rear view. 2 is a diagram illustrating an internal configuration of a digital image processing apparatus according to an embodiment of the present invention.

The digital image processing apparatus 100 according to the present embodiment is a compact digital camera, and is a digital camera having a lens unit integrated with a main body unit.

According to the present embodiment, the digital image processing apparatus 100 is made of a compact digital camera, but the present invention is not limited thereto. That is, the digital image processing apparatus according to the present invention may be a single-lens reflex camera capable of attaching and detaching a lens.

1 (a) and 1 (b), the external components will be described with reference to the lens unit 111, the flash 112, the auxiliary light emitting means 113, the shutter release button 141, and the power button ( 142) on the front and top surfaces. In addition, various buttons as a user input unit are provided on the back of the digital image processing apparatus 100, and a display screen 162 is provided.

The lens unit 111 is a portion for allowing the image light of the subject to pass through to form image light with an image pickup device (not shown).

The flash 112 flashes a bright light instantly when shooting in a dark place. The flash mode using the flash 112 includes auto flash mode, forced flash mode, flash off mode, red-eye reduction mode, slow synchro mode, and the like. have.

The auxiliary light emitting means 113 supplies the auxiliary light to the subject so that the digital image processing apparatus 100 automatically focuses quickly and accurately when the amount of light is insufficient or at night.

The shutter release button 141 generates an image capturing signal by the photographer's input. When the photographer presses the shutter-release button 141 halfway to input a half-shutter signal, the digital image processing apparatus 100 focuses and adjusts the amount of light. Then, when it is focused and the amount of light is adjusted, the photographer can press the shutter release button 141 completely to capture the captured image.

The power button 142 is a key input button disposed above the digital image processing apparatus 100 to supply power to and operate the digital image processing apparatus 100.

The user input unit includes various key buttons, which are used by a user to manipulate necessary functions of the digital image processing apparatus 100. The user input unit includes buttons such as a wide angle-zoom button 143W, a telephoto-zoom button 143T, a function button 146, a play button 147, and the like.

The display screen 162 includes a liquid crystal display (LCD), and not only performs a function of displaying an image of a photographed subject in real time, but also displays a state information of the digital image processing apparatus 100. To perform. In the present embodiment, the display screen 162 is a liquid crystal display, but the present invention is not limited thereto. That is, the display screen according to the present invention may be made of an organic light-emitting diode, a field emission display (FED), or the like.

Hereinafter, the functions of the internal configuration of the digital image processing apparatus will be described with reference to FIG. 2. When the internal configuration is classified and described according to a function, the digital image processing apparatus 200 may include an image capturing unit 210, a controller 220, a storage unit 230, a user input unit 240, a camera shake correction module 250, and a display. The unit 260 is included. The division of the internal configuration is exemplary and does not limit the present invention.

The imaging unit 210 is a part of photographing a subject and converting an image of the subject into an electrical signal. The imaging unit 210 may include a lens unit for passing image light from a subject and an imaging device (not shown) for converting the passed image light into an electrical signal. As the imaging device, a complementary metal oxide semiconductor (CMOS) or a charge coupled device (CCD) may be used. The apparatus may further include an image signal processor configured to analyze an electrical signal applied from the imaging device and convert the electrical signal into a digital signal representing an image to generate an image signal. The applied image signals are temporarily stored in the RAM of the storage unit 230 to be described later.

The controller 220 performs overall control of the digital image processing apparatus 200 according to the present invention.

The storage unit 230 stores various signals, data, and algorithms for operating the digital image processing apparatus 200.

The storage unit may include a RAM as a temporary storage medium. The RAM may temporarily store an image signal generated by the imaging unit. The RAM may be a dynamic random access memory (DRAM) or the like.

Meanwhile, a memory card or the like may be used as a storage medium for storing the image file generated by using the image signal generated by the imaging unit 210. The memory card may be internal or removable.

In addition, an EEPROM (electrically erasable and programmable read only memory) may be used as a storage medium that stores user setting data related to shooting conditions and stores a program for implementing an algorithm for controlling the digital image processing apparatus 200. .

The description of the user input unit 240 has been described in the description of FIG.

The camera shake correction module 250 detects a user's hand shake to prevent shaking of an image. The camera shake correction module 250 may include a detector 251 and a camera shake correction unit 252.

The detector 251 detects a shake of the digital image processing apparatus 200 due to the shaking of the user. The shake may be detected using a gyro sensor or the like.

The camera shake correction unit 252 finely adjusts the position of the lens or the image pickup device by using the detection signal detected by the detector 251. In addition, the image stabilizer 252 determines how much the image of the image file generated at the input of the shutter-release button is shaken and generates information indicating the degree of shaking.

Hereinafter, an example of a method of determining the degree of shaking of the captured image will be described.

One method of determining the degree of shaking of the captured image is as follows. When the sensing unit 251 includes a gyro sensor, a gyro signal is generated from the gyro sensor. The gyro signal is a signal indicating the direction of the shake by detecting the shake of the device equipped with the gyro sensor. The image stabilizer 252 may generate a hall signal for finely adjusting the image pickup device or the lens using the gyro signal. As a result, it is possible to determine how much the image of the generated image file is shaken by calculating a difference of the degree corrected by the hall signal with respect to the shake degree indicated by the gyro signal. That is, when the difference is large, it may be determined that the image is shaken a lot, and when the difference is small, the image may be determined to be clear.

Another method of determining the degree of shaking of the captured image may be a method of analyzing the generated image file in the frequency domain. When a subject is photographed to generate an image file, focus is generally achieved. At the moment of focus, the high frequency component of the image file is maximized. Accordingly, the degree of image shaking may be determined by analyzing the generated image file and measuring the amount of high frequency components and comparing the measured high frequency components with the amount of high frequency components measured at the moment when the image is focused. That is, when the amount of the high frequency component is large, it may be determined that the image is shaken much. When the amount of the high frequency component is small, the image may be determined to be clear.

The method is exemplary, and in addition to the above-described method, it may be possible to determine the degree of shaking of the image by various algorithms.

The information indicating the shaking degree may be included in the Exif header when generating the image file by the image capturing signal.

The image file generator (not shown) generates an image file using the image signal generated last by the image capturing signal. That is, the image capture unit 210 converts the data into YCbCr format data using raw data generated by the image light of the subject formed in the image pickup device, and generates an image file by compressing the data according to the JPEG format.

In creating an image file, the file structure is made according to a file format called Exif. In the Exif file format, image data is compressed in the JPEG format. In the Exif file format, the Exif header can include various data about shooting conditions, that is, attribute information. Among them, the maker note area can be added arbitrarily according to the manufacturer. Therefore, the digital image processing apparatus according to the present invention may include information indicating the degree of shaking of the image determined by the image stabilizer 252. Attribute information included in the Exif header may be called and used at any time as needed.

The display unit 260 displays a subject, a user interface (UI) provided according to manipulation of buttons by a user, a preview image in the preview mode, a playback image in the playback mode, and the like. The display unit 260 may include a display driver 261 and a display screen 262.

The display driver 261 performs a function of reproducing an image such as an image signal, an image file, and the like. In the meantime, the display screen 262 is a part for displaying the reproduced image so that the user can check it, and thus the detailed description thereof will be omitted.

The display driver 261 may display information on the display screen 262 such as the remaining battery capacity, the number of recordable photos, the ISO sensitivity, and whether the flash is set. Providing information related to such shooting superimposed on a preview image or a reproduced image is called an OSD (On Screen Display).

On the other hand, when the display driver 261 receives information on the degree of image shake from the controller 220 or the image stabilizer module 250, the display driver 261 displays the contents on the display screen 262 so that the user can recognize the contents. Create an image for The image may be generated by a character or a graph such as a number or an alphabet.

The image is an image representing the degree of shaking, and the image is displayed on the display screen 262 in an OSD manner. In displaying the image indicating the shaking degree, the image indicating the shaking degree may be displayed by being synthesized with a quick-view image provided immediately after photographing a subject. Alternatively, after capturing, the image indicating the degree of shaking may be displayed by combining the image with the reproduced image in the reproduction mode.

In FIG. 2, all signals or data are moved around the controller 220 for convenience of description, but in practice, data and various control signals may be moved through a data bus, or various forms. It will also be described as illustrated.

As mentioned above, the user can easily check whether the image photographed by the user is severely shaken by displaying an image representing the shaking degree of the image captured by the digital image processing apparatus having the image stabilizer module.

3 is a diagram illustrating a state in which an image shake is displayed on a display screen according to an embodiment of the present invention.

Referring to FIG. 3, a quick-view image is displayed on the display screen 300. The outline of the person, which is the subject, is blurred by shaking the image shown on the display screen 300. On the lower left side of the display screen 300, an image 310 indicating the degree of shaking of the image by numbers is displayed by the OSD method. In the present embodiment, the image 310 indicating the degree of shaking is represented by a number, and the range of the number may be 0 to 5. Alternatively, the range may be set to 0 to 10. That is, the range of the number can be changed in various ways, and it will also be possible to represent not only numbers but also letters such as alphabets such as A to F.

4 is a diagram illustrating a state in which an image shake is displayed on a display screen according to another exemplary embodiment of the present invention.

In FIG. 4, a thumbnail image is displayed as a playback image on the display screen 400 in the playback mode. A four segment thumbnail image is displayed as the thumbnail image, and an activation cursor 420 is positioned on the image in the upper right corner. In addition, an image 410 representing a degree of shaking of the image is displayed at the bottom left in a bar graph form. Among the bar graphs, the bar graph indicating the shaking degree of the image where the activation cursor 420 is located may be displayed thicker than other graphs as shown in FIG. 4.

Meanwhile, even when images of the subject are continuously photographed in the continuous shooting mode, it may be possible to simultaneously display the degree of shaking of the images of the image group using the bar graph in the image group generated by the single photographing signal. In this case, it is easy to select and store only the unstable images among the images photographed in the continuous shooting mode and delete the rest.

As mentioned above, by judging the degree of shaking of the captured image, by storing the information indicating the degree of shaking of the image in the attribute information area of the Exif header, and calling it and displaying it as a quick-view image or a playback image The user can easily know whether the captured image is severely shaken.

5 (a) and 5 (b) are flowcharts 500a and 500b illustrating a control method of a digital image processing apparatus according to an embodiment of the present invention.

FIG. 5A illustrates a method of displaying the degree of shaking of an image in a quick-view image that temporarily displays a captured image to a user immediately after the photographing.

Once in the shooting mode, the camera shake correction module provided in the digital image processing apparatus is operated (S500). When the user applies the image capture signal by turning on the shutter release button (S501), the image of the subject is captured to generate an image signal.

The shaking degree of the image captured by the image signal is determined (S503). The method of determining the degree of shaking of the image may be performed in the same manner as described with reference to FIG. 2.

When determining the degree of shaking of the image to generate the image file by including the information indicating the degree of shaking in the Exif header (S504). The image file is generated according to the Exif file format and will be compressed in JPEG format. In addition, the information indicating the shaking degree may be included in the attribute information of the Exif header, in particular, may be included in the maker note area that can be added and removed freely by the manufacturer.

The image indicating the shake degree is generated in order to display the image indicating the shake degree on the quick-view image together with the generation of the image file (S505). The image may be represented by letters, such as numbers, graphs, and alphabets.

The generated image representing the shaking degree is synthesized on the quick-view image displayed immediately after the image is displayed on the display screen (S506). In the synthesis method, the image indicating the degree of shaking in the quick-view image is synthesized by the OSD method.

By the above-mentioned method, the user can determine whether the shooting is successful by checking the image indicating the degree of shaking in the quick-view image provided immediately after the subject is photographed before confirming the playback image. This saves you the time it takes to delete.

FIG. 5 (b) shows a method of displaying a shaking degree of an image in a playback image to a user. In FIG. 5 (b), the step of generating an image file by including information indicating the degree of shaking of the image in the Exif header is the same as that of FIG. 5 (a).

Looking after the image file is generated, it is switched to the playback mode by the input signal from the user (S515). In the playback mode, the screen thumbnail image is provided as the initial playback image. However, the screen thumbnail image may be converted into a thumbnail image so that a plurality of playback images may be displayed on the display screen by an input signal from a user. The thumbnail image may be provided as an image such as 4 divisions or 9 divisions.

Once the playback mode is switched, the controller of the digital image processing apparatus or the part controlling the display of the image reads the screen thumbnail image data or the thumbnail image data from the image file and simultaneously reads the attribute information of the Exif header included in the image file. Can come. In the present invention, information indicating the degree of shaking is included in the image file, and therefore information indicating the shaking information is called from the Exif header of the image file stored in the storage medium (S516).

Using the called information, an image indicating a degree of shaking is generated (S517), and the generated image is displayed on a display screen by synthesizing the generated image with an image of a subject, that is, a screen thumbnail image or a thumbnail image (S518). The image representing the shaking degree may use numbers, alphabets, graphs, etc. as shown in FIG.

According to the above-mentioned method, in checking the playback video, the user confirms whether the video is shaken by checking the video indicating the shaking degree without having to magnify each video to check whether the video is shaken. It is possible to determine whether to delete the image.

The above detailed description and drawings are merely exemplary of the present invention, but are used only for the purpose of illustrating the present invention and are not intended to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical protection scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (7)

A digital image processing apparatus comprising a camera shake correction module for detecting a camera shake and correcting the shake. Determining the degree of shaking of the image due to the shaking of the user in the captured image, and displays an image indicating the degree of shaking on the display screen. The method of claim 1, And displaying the image indicating the shaking degree on a display screen in an OSD manner. The method of claim 2, And synthesizing the image representing the shaking degree with a quick-view image of the photographed image and displaying the image on a display screen. The method of claim 2, And displaying the image indicating the shaking degree on a display screen by synthesizing the image with the reproduced image of the captured image. The method of claim 2, The image indicating the degree of shaking is a digital image processing apparatus, characterized in that using any one method of numbers, graphs or alphabets. The method according to any one of claims 2 to 4, And storing the information indicating the shaking degree in an Exif header. In the control method of the digital image processing apparatus comprising a hand shake correction module for detecting the hand shake to correct the hand shake, (a) determining the degree of shaking of the captured image; (b) generating an image file by including information indicating the shaking degree in an Exif header; (c) generating an image representing the shaking degree by using the information indicating the shaking degree; And and (d) displaying the generated image.