KR20090001345A - Method of controlling digital image processing apparatus wherein moving-picture photographing mode is performed, and digital image processing apparatus adopting the method - Google Patents

Abstract

A method of controlling a digital image processing apparatus in which a moving-picture photographing mode is performed, and a digital image processing apparatus using the method are provided to form a plurality of frames as a representative frame according to the order of motion-vector difference values, thereby rapidly searching a moving file that a user wants. When images of a series of frames are stored in a moving picture file during a moving picture photographing mode, a motion-vector difference value of a current frame is calculated. The motion-vector difference value of the current frame is the sum of gradation change amounts per each pixel between a previous frame and the current frame. A plurality of frames is selected according to a bigger size order of the motion-vector values. A representative frame is formed by reducing image data of the selected frames.

Description

Control method of a digital image processing apparatus in which a moving picture capturing mode is performed, and a digital image processing apparatus employing the method {method of controlling digital image processing apparatus wherein moving-picture photographing mode is performed, and digital image processing apparatus adopting the method}

1 is a perspective view showing the front and top appearance of a digital camera as a digital image processing apparatus employing a control method according to the present invention.

FIG. 2 is a rear view illustrating a rear shape of the digital camera of FIG. 1.

3 is a diagram illustrating the overall configuration of the digital camera of FIG. 1.

4 is a flow chart showing the main algorithm of the digital camera processor of FIG.

5 is a flowchart illustrating that the photographing modes of FIG. 4 are distinguished.

6 is a flowchart illustrating an algorithm of the video photographing mode of FIG. 5.

FIG. 7 shows that step S609 is repeatedly performed in the algorithm of FIG. 6.

FIG. 8 illustrates that four frames are selected in the order of increasing motion-vector difference values in step S615 of FIG. 6.

9 is a block diagram illustrating a structure of a video file completed by the operation of the video recording mode of FIG. 6.

10 is a diagram illustrating an example in which a representative frame is displayed in a playback mode.

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

1 ... digital camera, 11 ... self-timer lamp,

12 ... flash, 13 ... shutter release button,

15 ... function buttons, 16 ... ASR mode buttons,

17 ... power button, 19 ... flash-light sensor, 20 ... lens section, 22 ... camera-status lamp,

23 ... special-effect buttons, 24 ... camera strap,

25 ... earphone connection, MIC ... microphone,

SP ... speakers, 35 ... display panels,

36 ... + /-buttons, 39 ... Zoom / 9 split / volume buttons,

42 ... play / print button, 43 ... mode button,

OPS ... optical system, OEC ... photoelectric converter, M _Z ... zoom motor, M _F ... focus motor,

M _A ... aperture motor, 501 ... analog-to-digital converter,

502 timing circuit, 503 real time clock,

504 ... DRAM, 505 ... EEPROM, 506 ... memory card interface, 507 ... digital camera processor, 508 ... RS232C interface, 509 ... video filter, 21a ... USB connection, 21b ... RS232C connection, 21c ... video output, 510 ... lens driver, 511 ... flash controller, 512 ... microcontroller, INP ... user input, LAMP ... light emitter, 513 ... audio processor, 514 ... LCD driver, 62 ... flash memory, MF ... movie file,

F101 to F105, F1 to F13 ... frames,

V _M , V _M102 to V _M105 ... motion-vector difference values.

The present invention relates to a control method of a digital image processing apparatus, and more particularly, to a control method of a digital image processing apparatus in which a moving picture photographing mode is performed.

Conventional digital image processing apparatuses, for example, a photographing method of a digital camera may include a moving picture photographing mode, a continuous-shooting mode, and a general photographing mode. By such shooting, moving image files and / or still image files are stored in the recording medium.

Also, in the playback mode, the first frame is displayed to indicate a moving picture file. However, the user cannot easily know what the contents of the video file are by looking only at the first frame. Accordingly, the user is inconvenient to roughly play the video in order to know what the contents of the video file are. That is, in order to find a video file of a desired content, it is inconvenient to reproduce the videos of many other files roughly.

It is an object of the present invention to provide a control method and a digital image processing apparatus of a digital image processing apparatus that enables a user to quickly find a moving image file having a desired content.

The method of the present invention for achieving the above object, as a control method of the digital image processing apparatus is performed a moving picture capturing mode, comprising the steps (a) to (c).

In the step (a), the motion-vector difference value of the current frame, which is the sum of gray level change amounts for each pixel, between the previous frame and the current frame in the process of storing images of a series of frames in the video file in the moving picture capturing mode. This is calculated.

In step (b), a plurality of frames are selected according to the order in which the motion-vector difference values are large.

In the step (c), the image data of the selected frames is reduced to form a representative frame.

An apparatus of the present invention for achieving the above object is a digital image processing apparatus equipped with a main controller. Here, the main controller adopts the control method of the present invention.

According to the control method of the digital image processing apparatus of the present invention and the digital image processing apparatus employing the method, a plurality of frames in the order of the larger motion-vector difference value form a representative frame. Accordingly, in the playback mode, images of frames in which different scenes exist may be displayed to indicate the video file.

Accordingly, the user can easily know what the contents of the video file are while looking at the representative frame having different scenes. Therefore, the user does not need to roughly play the video in order to know what the contents of the video file are. That is, the user does not need to roughly play the videos of many other files in order to find a video file of desired contents.

In conclusion, the user can quickly find a video file having a desired content.

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

Referring to FIG. 1, the self-timer lamp 11, the flash 12, and the shutter release button 13 are located at the front and the top of the digital camera 1 as a digital image processing apparatus employing the control method according to the present invention. And an Advanced Shake Reduction (ASR) mode button 16, a power button 17, a lens unit 20, a microphone MIC, and a speaker SP.

In the self-timer mode, the self-timer lamp 11 operates for a set time from the time when the shutter release button 13 is pressed to the time when the image starts to capture. In addition, the self-timer lamp 11 generates auxiliary light according to the user's selection.

The ASR mode button 16 is used to compensate for camera shake. The ASR mode button 16 is also used as a lock button. For example, when the ASR mode button 16 is pressed for less than 1 second, the image stabilization function is performed, and when the ASR mode button 16 is pressed for 1 second or more, the lock function in the playback mode is performed.

The shutter release button 13 has a two-stage structure. That is, when the user operates the wide-angle zoom button 39 _W and the tele-zoom button 39 _T , and presses the shutter release button 13 only one step, the SH1 signal from the shutter release button 13 is turned on. And the second stage is pressed, the SH2 signal from the shutter release button 13 is turned on. In the still image shooting mode and the moving image shooting mode, the image is captured after the SH2 signal is pressed. In the continuous-shooting mode, images are captured continuously while the SH1 signal is on.

2, behind the digital camera 1 according to the present invention, the function buttons 15, the camera-status lamp 22, the special-effects button 23, the camera strap 24, the earphone There is a connection 25, a display panel 35, a +/- button 36, a zoom / 9 split / volume button 39, a play / printer button 42, and a mode button 43.

The function buttons 15 are used by the user to perform specific functions of the digital camera 1, are used as direction-shift buttons of the activation cursor on the menu screen of the display panel 35, and are played back in the playback mode. It is used to switch files and recording media.

The camera-state lamp 22 is used to show various operating states of the camera. The special-effect button 23 is used to set special effects on the image to be photographed.

In the present embodiment, the display panel 35 adopts a touch screen method. The +/- button 36 is used to adjust the shutter speed for night scene photography and the like.

The zoom / 9split / volume button 39 is used to perform a zooming operation in shooting or playback mode, to display nine pictures in a single playback mode, or to adjust the volume of audio. Used for

The play / printer button 42 is used for switching between the play mode and the preview mode or for direct output to the printer.

The mode button 43 is used to select a PMP (Portable Media Player) mode or various shooting modes.

3 shows the overall configuration of the digital camera 1 of FIG. Referring to Figures 1 to 3, the overall configuration and operation of the digital camera 1 of Figure 1 will be described.

The optical system OPS including the lens unit and the 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 zoom / split / volume button 39 included in the user input unit INP in the preview mode or the video shooting mode, a corresponding signal is input to the microcontroller 512. Accordingly, as the microcontroller 512 controls the lens driver 510, the zoom motor M _Z is driven to move the zoom lens.

Meanwhile, in the auto focusing mode, the focus motor M _F is driven by the main controller embedded in the digital camera processor 507 controlling the driving unit 510 through the microcontroller 512. As a result, the focus lens is moved, and in this process, the position of the focus lens where the high frequency component of the image signal is the largest, for example, the number of driving steps of the focus motor M _F is set. Reference numeral M _A denotes a motor for driving an aperture (not shown).

A photoelectric conversion unit (OEC) of a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) converts light from an optical system (OPS) into an electrical analog signal. Here, the digital camera processor 507 as the main controller controls the timing circuit 502 to control the operations of the photoelectric converter OEC and the analog-digital converter 501. The CDS-ADC (Correlation Double Sampler and Analog-to-Digital Converter) element 501 as an analog-to-digital converter processes the analog signal from the photoelectric converter (OEC), removes the high frequency noise, and adjusts the amplitude. After that, it is converted into a digital signal.

The real time clock 503 provides time information to the digital camera processor 507. The digital camera processor 507 processes digital signals from the CDS-ADC element 501 to generate digital image data classified into luminance and chroma signals.

The self-timer lamp 11 and the camera-status lamp 22, etc., are provided in the light emitting part LAMP driven by the microcontroller 512 according to control signals from the digital camera processor 507 incorporating the main controller. This includes.

The user input unit INP includes a shutter release button 13, function buttons 15, an ASR mode button 16, a power button 17, a special-effect button 23, a +/- button 36, Zoom / 9 split / volume buttons 39, playback / printer buttons 42, mode buttons 43, and the like are included.

In the DRAM (Dynamic Random Access Memory) 504, digital image data from the digital camera processor 507 is temporarily stored. The EEPROM (Electrically Erasable and Programmable Read Only Memory) 505 stores algorithms necessary for the operation of the digital camera processor 507. In the memory card interface (MCI) 506, a user's memory card is detached. The flash memory FM stores setting data necessary for the operation of the digital camera processor 507. In the memory card interface 506, a plurality of memory cards are detached as recording media of a user.

The digital image data from the digital camera processor 507 is input to the LCD driver 514, whereby the image is displayed on the display panel 35.

In the interface unit 21, the digital image data from the digital camera processor 507 is transmitted by serial communication via a universal serial bus (USB) connection unit 21a or an RS232C interface 508 and the connection unit 21b. It may be transmitted as a video signal through the video filter 509 and the video output unit 21c.

The audio processor 513 outputs the audio signal from the microphone MIC to the digital camera processor 507 or the speaker SP, and outputs the audio signal from the digital camera processor 507 to the speaker SP.

On the other hand, the microcontroller 512 drives the flash 12 by controlling the operation of the flash controller 511 according to the signal from the flash-light amount sensor 19.

4 shows the main algorithm of the digital camera processor 507 of FIG. A main algorithm of the digital camera processor 507 of FIG. 3 will be described with reference to FIGS. 1 to 4 as follows.

When operating power is applied to the digital camera 1, the digital camera processor 507 executes initialization (step S1). When this initialization step S1 is executed, the digital camera processor 507 performs a preview mode (step S2). In this preview mode, the input image is displayed on the display panel 35.

Next, when the SH1 signal, which is the first-stage signal from the shutter release button 13, is On (step S3), the digital camera processor 507 performs a shooting mode (step S4).

Next, when signals corresponding to the setting mode are input among the input signals from the user input unit INP (step S5), the setting mode for setting the operating conditions according to the input signals from the user input unit INP is performed. (Step S6).

On the other hand, if no end signal is generated (step S7), the digital camera processor 507 determines whether a conversion signal to any other mode has been generated (step S8).

If no conversion signal to any other mode is generated in step S8, the digital camera processor 507 repeats step S2 and subsequent steps. If a conversion signal to any other mode is generated in step S8, the digital camera processor 507 repeatedly performs step S2 and subsequent steps after performing the mode (step S9).

Referring to FIG. 5, the digital camera processor 507 determines the shooting method currently set (step S51), and then the video shooting mode (step S52) and the normal shooting mode (step S53) according to the shooting method currently set. ), Or the continuous-shooting mode (step S54).

6 shows an algorithm of the video shooting mode (step S52) of FIG. FIG. 7 shows that step S609 is repeatedly performed in the algorithm of FIG. 6. In FIG. 7, reference numerals F101 to F105 denote frames, and V _M102 to V _M105 denote motion-vector difference values, respectively. FIG. 8 shows that four frames F4, F5, F10, and F13 are selected in the order of increasing motion-vector difference value V _M in step S615 of FIG. 6. In FIG. 8, reference numerals F1 to F13 denote frames, and V _M denotes motion-vector difference values, respectively.

1, 3, and 6 to 8, the algorithm of the video shooting mode (step S52) will be described sequentially.

First, the digital signal processor 507 determines whether the SH2 signal, which is the two-stage signal from the shutter release button 13, is switched to the on state and then restored to the off state (step S601).

If the SH2 signal, which is the two-stage signal from the shutter release button 13, has never been turned on, the digital signal processor 507 has a shutter release button because the user has not generated a moving picture-shooting start signal. It is determined whether the SH1 signal, which is the first stage signal from (13), is on (step S603).

In the step S603, if the SH1 signal is On (On), since the user is to start shooting video, the step S601 is performed again.

In step S603, if the SH1 signal is not On, the user does not plan to start video recording, and thus the execution of the program is terminated.

In step S601, if the SH2 signal, which is the two-stage signal from the shutter release button 13, has been switched to the on state, the user has generated a recording start signal, and thus the digital signal processor 507 Follow the steps.

First, the digital signal processor 507 generates one video file on a recording medium, for example, a memory card (step S605).

Next, the digital signal processor 507 captures an image of a unit frame (step S607). In addition, the digital signal processor 507 calculates a motion-vector difference value V _M of the current frame, which is the sum of gray level variations for each pixel, between the previous frame and the current frame (step S609, see FIG. 7).

Next, the digital signal processor 507 stores the image of the current unit frame in the moving image file (step S611).

Next, the digital signal processor 507 determines whether the SH2 signal, which is the two-stage signal from the shutter release button 13, is switched to the on state and then restored to the off state (step S613).

If the SH2 signal, which is the two-stage signal from the shutter release button 13, has never been turned on in step S613, since the user has not generated the video-shooting end signal, the digital signal processor 507 The above steps S607 to S613 are repeated.

If the SH2 signal, which is the two-stage signal from the shutter release button 13, has been switched on in step S613, the user has generated the video-shooting termination signal, and therefore the digital signal processor 507 After performing steps S615 to S621, execution of the program is terminated.

In step S615, the digital signal processor 507, for example, sets four frames (F13, F10, F5, and in the case of FIG. 8) according to the order in which the motion-vector difference value V _M is large. F4) is selected to load the video data.

In operation S617, the digital signal processor 507 reduces the image data of the loaded four frames F13, F10, F5, and F4 by 1/4 to form a representative frame.

In step S619, the digital signal processor 507 stores the representative frame at the position of the first frame of the moving picture data in the moving picture file.

Finally, in step S621, the digital signal processor 507 completes the video file.

In summary, the motion-vector and the difference value (V _M) is formed of four frames (F13, F10, F5, and F4) a representative frame according to the descending order. Accordingly, in the playback mode, images of frames F13, F10, F5, and F4 in which different scenes exist may be displayed to indicate a moving image file.

Accordingly, the user can easily know what the contents of the video file are while looking at the representative frame having different scenes. Therefore, the user does not need to roughly play the video in order to know what the contents of the video file are. That is, the user does not need to roughly play the videos of many other files in order to find a video file of desired contents.

In conclusion, the user can quickly find a video file having a desired content.

FIG. 9 illustrates a structure of a video file MF completed by the operation of the video capturing mode S52 of FIG. 6.

Referring to FIG. 9, the video file MF completed in the video shooting mode S52 of FIG. 6 includes a file starter 901, head data 902, all video data 903, and audio data 904. , And file terminator 905 are stored.

The file start section 901 includes data indicating the start of the file. Head data 902 includes data indicating the file format. The entire image data 903 and the audio data 904 are multiplexed with each other.

In all image data 903, the representative frame is stored at the position of the first frame of the moving image data.

In the table-image data 135, a representative frame of a graphics exchange format (GIF) obtained in step S619 of FIG. 6 is stored. Of course, this representative frame may be stored in a location different from the video file as a file of a graphics exchange format (GIF).

The file terminator 905 includes data indicating the end of the file.

10 shows an example in which the representative frame is displayed on the color LCD panel 35 in the reproduction mode. Referring to FIG. 10, images of four frames in which different scenes exist are displayed to indicate a moving image file.

Referring to steps S617 and FIG. 10 of FIG. 6, when the resolution of the color LCD panel 35 is 640 x 480 pixels, and the unit frame of the video data is stored at the resolution of 640 x 480, four pixels forming a representative frame are formed. The resolution of each of the reduced frames is 320 × 240.

As described above, according to the control method of the digital image processing apparatus according to the present invention, and the digital image processing apparatus employing the method, a plurality of frames in order of increasing motion-vector difference value form a representative frame. . Accordingly, in the playback mode, images of frames in which different scenes exist may be displayed to indicate a moving image file.

Accordingly, the user can easily know what the contents of the video file are while looking at the representative frame having different scenes. Therefore, the user does not need to roughly play the video in order to know what the contents of the video file are. That is, the user does not need to roughly play the videos of many other files in order to find a video file of desired contents.

In conclusion, the user can quickly find a video file having a desired content.

The present invention is not limited to the above embodiments, but may be modified and improved by those skilled in the art within the spirit and scope of the invention as defined in the claims.

Claims (5)

In the control method of the digital image processing apparatus that the video recording mode is performed, (a) calculating a motion-vector difference value of a current frame, which is a sum of gray level change amounts of each pixel between a previous frame and a current frame, in a process of storing images of a series of frames in a video file in the moving picture capturing mode; (b) selecting a plurality of frames in order of increasing motion-vector difference; And and (c) reducing the image data of the selected frames to form a representative frame. The method of claim 1, The steps (b) and (c) are performed when a moving picture photographing end signal is generated by a user's operation. The method of claim 1, wherein in step (c), And the representative frame is stored in the video file. The method of claim 3, wherein in step (c), And the representative frame is stored at a position of a first frame of moving image data in the moving image file. A digital image processing apparatus equipped with a main controller, A digital image processing apparatus in which the main controller employs the control method of at least one of claims 1 to 4.

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