KR100201304B1 - The method of zooming function display for digital image processing apparatus - Google Patents

Abstract

end. TECHNICAL FIELD [0002]

A method for implementing a zooming function in a digital image processing apparatus

I. Technical Problems to be Solved by the Invention:

It is possible to implement zooming which is one of special functions of the digital image processing apparatus without additional circuit, and enables the user to easily use the zooming function by using the remote controller.

All. The point of the solution of the invention:

The present invention relates to a method of implementing screen zooming in a digital image processing apparatus including a frame memory for storing one screen as a frame-by-frame screen, wherein a size of a basic zooming screen for zooming is set to 1/4 A second step of associating a specific position of the frame screen to be selected with a key value position on the remote control panel; and a step of, when the user inputs a key value on the remote control panel for zooming, the position of the frame screen corresponding to the inputted key value And a fourth step of reading and displaying the pixel data belonging to the configured basic zooming screen in the frame memory.

la. Important Applications of the Invention: Screen zooming

Description

How to implement zooming function in digital image processing device

The present invention relates to a digital image processing apparatus, and more particularly, to a method of implementing a zooming function, which is one of special functions of a digital image processing apparatus without adding a separate circuit.

Recently, video data, audio data, and other data that have been generated and processed in a heterogeneous and independent manner in accordance with the remarkable extension of digital communication technology, high integration semiconductor (VLSI), and signal processing (DSP) It can be processed and used in a wide variety of forms without discrimination. In this environment, there is a need to standardize the international transmission standard of digital data for smooth information transmission and sharing between different devices. According to the necessity, Joint Picture Experts Group (hereinafter referred to as JPEG) And Moving Picture Experts Group (hereinafter referred to as " MPEG ") for transferring moving pictures.

JPEG was developed for the main purpose of still image processing such as computer graphics. MPEG, on the other hand, can be used to store moving pictures in a compact disk, a digital audio tape, a hard disk drive, an optical disk, or the like, a telephone line, an integrated information network (ISDN) Transmission mode (ATM), communication satellite or satellite broadcasting line. The MPEG can be classified into MPEG1 and MPEG2 depending on which compression algorithm is used for video and audio. MPEG1 is a compression standard applied to an actual communication system, and MPEG2 is a compression standard to be applied to a communication system to be developed in the future. The MPEG-1 has applications such as CD-ROM, CD-I, and Video CD with parameters limited to 768 or less in the horizontal direction, 576 or less in the vertical direction, 30 Hz or less in the frame rate and 1,856,000 or less in the bit rate And is transmitted at a data rate of 1.5 Mbps. Data according to the MPEG1 standard (hereinafter referred to as MPEG data) is transmitted to the communication system through the network at the data rate. On the receiving side of the communication system, a typical communication system using MPEG data is called Video On Demand ).

Digitalization is accelerating in all fields including video and sound devices. One of the special functions of a digital image processing apparatus using MPEG (Moving Picture Expert Group) is a zooming function. The zooming function is a function of enlarging or reducing a specific portion of a screen desired by the user. This zooming function will be a special function that is more necessary according to the increase of educational software such as software and encyclopedia etc. and photographs such as Photo-CD.

FIG. 1 shows a digital video tape recorder (DVTR) of a digital image processing apparatus that has been zoomed in by a conventional method. Referring to FIG. 1, data of a recording medium 2 such as a tape or a disc on which data is recorded in a digital form is read using a pickup and servo unit 4, and is converted into data via a reproduction signal processing unit 6 and applied to the data processing unit 10.

The data output from the reproduction signal processing unit 6 is digital data, and its form is a bit stream. The data processor 10 performs error correction and demodulation under the control of the main controller 8, and divides the data into audio data and video data according to the data format. The output (audio data and video data) of the data processing unit 10 is converted into a non-log signal through the D / A converter 12. The audio signal among the converted analog signals is applied to the audio processing unit 14, And is applied to the video processor 18.

The signal processed by the video processing unit 18 is directly applied to the video output unit 28 without passing through the circuit blocks indicated by the reference block 100 when the zooming function is not performed. However, when performing the zooming function, it goes through the circuit blocks indicated by the reference block 100. The circuit parts in the reference block 100 are provided for the zooming function and include an A / D converter 24, a controller 22, a frame memory 24, and a D / A converter 26. In order to implement the zooming function, the signal processed by the video processor 18 is digitized through the A / D converter 20 in the reference block 100, and the digital data is supplied to the frame memory 24 / RTI > The stored digital data can be read in a form desired by the user (zooming in or zooming out to a specific part of the screen), and the zooming control unit 22 is required to control the frame memory 24 at this time. Data (hereinafter referred to as zooming data) read out from the frame memory 24 under the control of the zooming control unit 22 is output to the video output unit 28 via the D / A conversion unit 26. [ As a result, the user can enlarge or reduce a specific portion of a desired screen through a screen of a display device such as a monitor.

1, in order to realize a zooming function, the circuit parts of the reference block 100, namely, the D / A converter 20, the A / D converter 26, and the frame memory 24 and the zooming control section 22 for zooming control Is further demanded. The additional implementation of the zooming function increased the cost of the product and the complexity of the set made it difficult to implement.

It is therefore an object of the present invention to provide a method of implementing a zooming function, which is one of the special functions of a digital image processing apparatus, without adding a separate circuit.

It is another object of the present invention to provide a control method capable of implementing an easy zooming function using a remote controller.

It is still another object of the present invention to provide a method for adjusting a zooming ratio using a remote controller.

It is yet another object of the present invention to provide a method of performing image quality enhancement during zooming.

It is still another object of the present invention to provide a method for implementing zooming control using an existing main control unit.

According to another aspect of the present invention, there is provided a method of performing zooming in a digital image processing apparatus including a frame memory for storing one screen as a frame-by-frame screen, A second step of associating a specific position of a frame screen to be selected with a key value position on the remote control panel, And a fourth step of reading and displaying the pixel data belonging to the configured basic zooming screen in the frame memory.

It should be understood that one frame in the present specification is a unit constituting one screen.

1 shows an example of a digital image processing apparatus in which zooming is performed by a conventional method

2 is a block diagram illustrating an example of a digital image processing apparatus that is zoomed in according to an embodiment of the present invention.

3 is a view for explaining a basic zooming screen size according to an embodiment of the present invention;

4 is a diagram for explaining a method of selecting a zooming position using a remote controller;

5 is a flowchart of a zooming-in function control according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be noted that, in the following description, the same components of the drawings are denoted by the same reference numerals whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

2 is a diagram illustrating an example of a digital image processing apparatus that is zoomed in according to an embodiment of the present invention. 2, the structures of the recording medium 2, the pickup and servo unit 4, the reproduction signal processing unit 6, and the data processing unit 10 are the same as those in FIG.

In the present invention, the data processor 10 performs error correction and demodulation under the control of the main controller 8, and divides the data into audio data and video data according to the data format. And outputs the audio data to the audio decoder 40 and the video data to the video decoder 44. The audio decoder 40 decodes the audio data and outputs the decoded audio data to the audio output unit 42. The audio output unit 42 analogizes the audio data to finally output audio to the user.

On the other hand, the video decoder 44 is provided together with the frame memory 46 (actually, the video decoder 44 has the frame memory 46), and the frame memory 46 stores the MPEG frame structure IBBPBBBP ... ... IPBBPBB is the output form of the form ... ... It is the memory used to convert to the form. For reference, I, P and B represent I picture (Intra-Picture), P picture (Predictive-Picture) and B (Bidirectionally-Picture) pictures, respectively. The I-picture is an intra-frame coded picture, the P-picture is an inter-frame forward predictive coded predictive picture, and the B-picture is a bidirectional predictive coded picture.

Under the control of the main control unit 8, the frame data arranged in the frame memory 46 is applied to the video output unit 50, and the video output unit 50 determines the PAL or NTSC scheme.

2, a smoothing filter 48 is provided between the video decoder 44 and the video output unit 50. The smoothing filter 48 is provided according to an embodiment of the present invention to soften a rough screen during zooming. The smoothing filter 48 can be omitted as needed.

The main control unit 8 and the frame memory 46 of FIG. 2 are used for implementing the zooming function according to the present invention. The main control unit 8 may directly control the frame memory 46 to implement a zooming function, and may transmit information necessary for zooming to the video decoder 44 so that the video decoder 44 performs a zooming function. In the present invention, search, still frame by frame, and tric play are possible in a similar manner. Also, since the remote controller interface through the remote controller interface 54 is also controlled by the main controller 8, the main controller 8 performs the zooming function by using the remote controller key 56 on the remote controller 54 by the user.

Hereinafter, the zooming function according to the present invention will be described in more detail with reference to FIGS. 3 and 4. FIG.

First, a basic zooming screen size set in advance for performing the zooming function according to the present invention will be described. 3 is a view for explaining a basic zooming screen size according to an embodiment of the present invention. 3 (a) is a view showing the size of one frame stored in the frame memory 46, and FIG. 3 (b) is a view showing a basic zooming screen size. Referring to FIG. 3A, one frame has a size of 720 × 480 pixels. The basic zooming screen size according to the present invention is 360 × 240 pixels. Therefore, it can be seen that the size of the basic zooming screen is 1/4 of the size of one frame. The code CTR located at the center of the basic zooming screen means the center of the zooming screen. The basic position at the time of zooming is such that the center CTR of the zooming screen coincides with the center of the frame as shown in FIG. 3 (a). Accordingly, when the user selects the default position at the time of zooming, the main control unit 8 causes the center of the zooming screen to correspond to the center of the frame stored in the frame memory 46, and reads data corresponding to the basic zooming screen size from the frame memory 36.

Next, a method of selecting a zooming position using the remote controller 52 will be described. 4 is a diagram for explaining a method of selecting a zooming position using a remote controller. Referring to FIG. 4, the basic position at the time of zooming is such that the center of the zooming screen coincides with the center of the frame, as described above. This basic position corresponds to the key number 5 of the remote controller 52.

The key values located on the remote controller 52 shown in FIG. 4 and the zooming position in the corresponding frame are summarized as follows.

Screen center position in key value frame

① (180,120)

② (360,120)

③ (540,120)

④ (180, 240)

Screen center position in key value frame

⑤ (360,240)

⑥ (540, 240)

⑦ (180,360)

⑧ (360,360)

⑨ (540,360)

In the indication (x, y) of the frame position, x denotes the position of the pixel in the horizontal direction of the frame, and y denotes the position of the pixel in the vertical direction. If the user selects the key value 1 on the remote controller 52, the basic zooming screen for zooming is configured from (0,0) to (360,0) in the frame and from 0,0 to 0,240 in the vertical direction do. Accordingly, the main control unit 8 reads out the basic zooming screen selected and configured by the key value 1 from the frame memory 46. [

The number 5 located at the center of the key value on the remote controller 52 is used as a key for adjusting the zooming magnification. If the user presses the key value ⑤ once, the zooming magnification is adjusted by the process of 4 ×, 16 × zoom-in toggle in the selected basic zooming screen.

5 is a flowchart of a zooming-in function control according to an embodiment of the present invention. The zoom-in function according to the embodiment of the present invention will be described in more detail with reference to FIGS. 2 and 5. FIG.

When the user views the screen through the display unit and wants to zoom on a specific part of a specific screen, the zooming function key on the remote controller 54 is input. Then, the main control unit 8 detects this in step 100 through the remote control interface 54. Then, in step 101, the main control unit 8 selects the basic position of the basic zooming screen preset in advance. The default position of the basic zooming screen is selected as (360, 240) corresponding to the key value 5. That is, the main control unit 8 controls the frame memory 46 such that the center of the frame screen coincides with the center CTR of the basic zooming screen (see FIG. 3).

Then, if the user inputs the zooming position of the basic zooming screen through the remote controller 52, the main controller 8 determines in step 102 that the key value of the remote controller is input. If a key value is input, the position of the basic zooming screen is selected according to the key value. For example, if the user inputs number 6 as the key value, the position of the basic zooming screen is selected as (540, 240) (see FIG. 4). However, if the user does not input any key value after inputting the zoom-in function key, the basic positions 360 and 240 of the preset basic zooming screen become the selection positions.

When the position of the basic zooming screen is selected, the main control unit 8 determines in step 106 whether the user adjusts the zooming ratio using the remote controller 52. [ The user uses the ⑤ key of the remote controller 52 to adjust the zooming ratio. If the zooming magnification is adjusted, the main controller 8 enlarges or reduces the basic zooming screen constructed in accordance with the position selection in step 108 according to the zooming magnification control. When the ⑤ key of the remote controller 52 is pressed once, the selected basic zooming screen is enlarged 4 times, and when it is pressed twice, it is enlarged 16 times. Then, if it is pressed again, it will remain on the default screen. That is, it becomes a zooming toggle.

When the basic zooming screen configured according to the position selection is enlarged 4 times, one pixel constituting the basic zooming screen becomes 4 (= 2 × 2) pixels. When the basic zooming screen is enlarged 16 times, one pixel constituting the basic zooming screen becomes 16 (= 4 × 4) pixels. The main controller 8 sequentially reads one pixel four times (or sixteen times) for all the pixels of the basic zooming screen, and enlarges the zooming screen by the pixels .

Then, the main control unit 8 controls the enlarged or reduced zooming screen to be displayed. That is, the pixel data of the basic zoom-in screen configured in accordance with the position selection is read in a magnified or reduced manner, and is applied to the video output unit 50 through the video decoder 44 and the smoothing filter 48. The smoothing filter 48 smoothly processes the coarse image due to the enlargement of the screen. Therefore, the user can select a specific portion of a desired screen even by using only the remote controller 52, and enlarge or reduce the selected specific portion.

If the user does not perform the zooming adjustment using the remote controller 52 in step 106 of FIG. 5, the main control unit 8 proceeds to step 112 and controls to display only the basic zooming screen configured according to the position selection.

Although the main control unit 8 directly controls the frame memory 46 in the above description of the present invention, when the main control unit 8 gives information to the video decoder 44 and the video decoder 44 controls the frame memory 46, It is possible.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments but should be determined by the equivalents of the claims and the claims.

As described above, the present invention can implement zooming, which is one of the special functions of the digital image processing apparatus, without additional circuitry, and the user can easily use the zooming function using the remote controller. Particularly, it is possible to select a specific portion of a screen to be zoomed by using a remote controller, and to adjust a zoom ratio for a selected specific portion. In addition, in the present invention, since the screen which is rough due to the enlargement of the screen at the time of zooming is filtered using the smoothing filter, the quality of the screen is improved.

Claims (6)

A method for implementing a screen zooming in a digital image processing apparatus including a frame memory for storing one screen as a frame- A first step of setting a size of a basic zooming screen for zooming to 1/4 size of a frame screen, A second step of associating a specific position of a frame screen to be selected with a key value position on the remote control panel, A third step of constructing a basic zooming screen around a position of a frame screen corresponding to an input key value when a user inputs a key value on the remote control panel for zooming, And a fourth step of reading and displaying the pixel data belonging to the configured basic zooming screen in the frame memory. The zooming method according to claim 1, further comprising a step of enlarging or reducing the configured basic zooming screen at a zooming magnification when the user adjusts the zooming magnification using a predetermined key of the remote controller after the third step . 3. The method of claim 2, wherein the zooming magnification is four times or sixteen times that of the basic zooming screen. 4. The method of claim 3, wherein the size of the basic zooming screen is 360 x 240 pixels. The method of claim 3, further comprising smoothing filtering an enlarged zooming screen when displaying the enlarged zooming screen. 6. The method according to any one of claims 1 to 5, wherein the zooming control is performed by a main control unit of the digital image processing apparatus.