KR19980026791A - How to implement zooming function in digital image processing device - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs:

Implementation Method of Zooming Function in Digital Image Processing System

I. The technical problem the invention is trying to solve:

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

All. The gist of the solution of the invention:

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

la. Important uses 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 for implementing a zooming function, which is one of special functions of a digital image processing apparatus without additional circuitry.

With the recent expansion of digital communication technology and the integration of highly integrated semiconductor (VLSI) and signal processing (DSP) technology, video data, audio data and other data that have been generated and processed heterogeneously and independently in the past have been used as information sources and media. It can be processed and used in a wide variety of forms without distinction. In this environment, the need for standardization of international data transmission standards for digital data for the smooth transmission and sharing of information between different devices has emerged, and according to these needs, the Joint Picture Experts Group (hereinafter referred to as JPEG) ) And MPEG for moving picture transfer (hereinafter referred to as MPEG) have been standardized.

JPEG was developed primarily for the purpose of still image processing such as computer graphics. MPEG, on the other hand, stores video on compact disks, digital audio tapes, hard disk drives, optical disks, or on telephone lines, ISDN, asynchronous. It was developed in response to the necessity to transmit through the transmission mode (ATM), communication satellite or satellite broadcasting line. The MPEG may be classified into MPEG1 and MPEG2 according to which compression algorithm is used for video and audio. MPEG1 is a compression standard applied to a real communication system, and MPEG2 is a compression standard to be applied to a future communication system. The MPEG1 is an application having a parameter limited to 768 or less horizontal pixels, 576 or less vertical pixels, 30 Hz or less frames, and 1,856,000 bits or less, for example, CD-ROM, CD-I, video CD. It is a video compression standard that is mainly used in the back and the like is transmitted at a data rate of 1.5Mbps. Data according to the MPEG1 standard (hereinafter referred to as MPEG data) is transmitted to a communication system through a network at the data rate. A representative communication system that uses MPEG data on the receiving side of the communication system is Video On Demand (VOD). There is).

Digitalization is accelerating across all sectors, including video and audio. One of the special functions of digital image processing apparatus using the Moving Pictute Expert Group (MPEG) is zooming. The zooming function is a function of enlarging or reducing a specific portion of a screen desired by a user. This zooming function will become a special function that is more necessary in accordance with the increase of educational software including software and encyclopedia in photographs such as Photo-CD and consumer demand.

FIG. 1 shows an example of a digital video tape recorder (DVTR) of a digital image processing apparatus that is conventionally implemented by zooming. Referring to Fig. 1, the data of recording medium 2, such as a tape or disk, on which data is recorded in a digital form, is read and picked up by the pickup and servo unit 4, and is converted into data through the reproduction signal processing unit 6 and applied to the data processing unit 10.

The data output from the reproduction signal processing section 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 classifies the data into audio data and video data according to the format of the data. The output (audio data and video data) of the data processor 10 is converted into an analog signal through the D / A converter 12, and the audio signal of the converted analog signal is supplied to the audio processor 14 and the video signal of the converted analog signal is It is applied to the video processor 18.

When the video processing unit 18 does not perform the zooming function, the signal is directly applied to the video output unit 28 without passing through the circuit units indicated by the reference block 100. However, when performing the zooming function, the circuit parts indicated by the reference block 100 are passed through. The circuit units 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 more detail, the operation of the circuits when performing the zooming function will be described in detail. In order to realize the zooming function, the signal processed by the video processor 18 is digitalized through the A / D converter 20 in the reference block 100 and the digital data is stored in the frame memory 24. Are stored in. The stored digital data can be read in a form desired by the user (zoom in to a specific portion of the screen, zoom out), and a zooming controller 22 is required to control the frame memory 24. The data read out from the frame memory 24 (hereinafter referred to as zooming data) under the control of the zooming control unit 22 is output to the video output unit 28 via the D / A converter 26. This allows the user to enlarge or reduce a specific portion of the desired screen through the screen of the display device such as a monitor.

As described with reference to FIG. 1, in the related art, the circuit units of the reference block 100, that is, the D / A converter 20, the A / D converter 26, and the frame memory 24 and the zooming control unit 22 for zooming control are implemented to implement the zooming function. It can be seen that is further required. Additional implementations of the zooming feature increased the cost of the product and were not easy to implement due to the complexity of the set.

Accordingly, an object of the present invention is to provide a method for implementing a zooming function, which is one of special functions of a digital image processing apparatus, without additional circuitry.

Another object of the present invention is to provide a control method capable of easily implementing a zooming function using a remote controller.

It is still another object of the present invention to provide a method of enabling a control of a zooming ratio by using a remote controller.

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

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

In accordance with the above object, the present invention provides a screen zooming method in a digital image processing apparatus including a frame memory for storing one screen as a frame unit screen, wherein the size of the basic zooming screen for zooming is set to the frame screen. A first process of setting the size to 1/4 size, a second process of mapping a specific position of the frame screen to be selected for zooming with a key value position on the remote control panel, and a corresponding key value when the user inputs a key value on the remote control panel for zooming And a fourth process of configuring a basic zooming screen based on the position of the frame screen, and a fourth process of reading pixel data belonging to the configured basic zooming screen from the frame memory.

In the present specification, it should be understood that one frame constitutes one screen.

1 is an example of a digital image processing apparatus conventionally implemented by zooming.

2 is an example of a digital image processing apparatus implemented with zooming according to an embodiment of the present invention.

3 is a diagram illustrating a basic zooming screen size according to an embodiment of the present invention.

4 is a view for explaining a zooming position selection method using a remote control.

5 is a flow chart of a zooming function control according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, it should be noted that like elements are denoted by like reference numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

2 is an example of a digital image processing apparatus implemented with zooming according to an embodiment of the present invention. 2, the configuration of the recording medium 2, the pickup and servo unit 4, the reproduction signal processing unit 6, and the data processing unit 10 is the same as that of FIG.

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

On the other hand, the video decoder 44 is provided with the frame memory 46 (actually, the video decoder 44 has the frame memory 46), and the frame memory 46 is an IBBPBBBP. … Type is the output type IPBBPBB... … The memory used to convert the form. For reference, I, P, and B mean an I picture (Intra-Picture), a P picture (Predictive-Picture), and a B (Bidirectionally-Picture) picture. The I picture is an intra-frame coded picture, the P picture is an inter-frame forward predictive coded prediction picture, and the B picture is a bi-predictive coded picture.

Under the control of the main controller 8, the frame data arranged in the frame memory 46 is applied to the video output unit 50, and the video output unit 50 is determined by the PAL or NTSC method, and the data is converted according to the method and finally output to the user.

Meanwhile, in FIG. 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 exemplary embodiment of the present invention and is used to soften a roughened screen when zooming. If necessary, the smoothing filter 48 may be omitted.

The main controller 8 and the frame memory 46 of FIG. 2 are used to implement the zooming function according to the present invention. The main controller 8 may directly control the frame memory 46 to implement a zooming function. The main controller 8 may also transmit information necessary for implementing zooming to the video decoder 44 so that the video decoder 44 performs the zooming function. In the present invention, a similar method is also possible for trick play of search, still, frame by frame. In addition, since the remote controller interface via the remote controller interface 54 is also controlled by the main controller 8, the main controller 8 performs the zooming function even when the user uses the remote controller key 56 of the remote controller 54.

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

First, a default zooming screen size set in advance to perform a zooming function according to the present invention will be described. 3 is a diagram for describing a basic zooming screen size according to an exemplary embodiment of the present invention. FIG. 3A is a diagram showing the size of one frame stored in the frame memory 46, and FIG. 3B is a diagram showing the basic zooming screen size. Referring to FIG. 3A, the size of one frame is 720 × 480 pixels, and 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 symbol 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 to make the center CTR of the zooming screen coincide with the center of the frame as shown in Fig. 3A. Therefore, when the user selects the basic position during zooming, the main controller 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 from the frame memory 36 as much as the size of the basic zooming screen.

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

4, the key values located on the remote controller 52 and the zooming position in the 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 display (x, y) of the frame position, x means the position of the pixel in the horizontal direction of the frame, y means the position of the pixel in the vertical direction. If the user selects the key value ① on the remote control 52, the basic zooming screen for zooming consists of (0,0) to (360,0) horizontally in the frame and (0,0) to (0,240) vertically in the frame. do. Therefore, the main controller 8 can read the basic zooming screen selected and selected by the key value ① from the frame memory 46.

⑤, located at the center of the key value on the remote controller 52, is used as a key for adjusting zooming magnification. If the user keeps pressing the key value ⑤ once, the zooming magnification is adjusted by the process of 4x, 16x, zooming toggle.

5 is a flowchart illustrating a zooming function control according to an embodiment of the present invention. 2 and 5 will be described in more detail the zoom day function according to an embodiment of the present invention.

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

Thereafter, 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 a key value of the remote controller is input. If a key value is entered, the position of the basic zooming screen is selected according to the key value. For example, if the user inputs 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 the user inputs the zooming function key, the default positions 360 and 240 of the preset basic zooming screen become the selected positions.

When the position of the basic zooming screen is selected, the main controller 8 determines whether the user adjusts the zooming magnification using the remote controller 52 in step 106. The user uses the key ⑤ on the remote control 52 to adjust the zooming magnification. If the zooming magnification is adjusted, the main controller 8 enlarges or reduces the basic zooming screen configured according to the position selection in step 108 according to the zooming magnification control. When ⑤ key on remote controller 52 is pressed once, the selected basic zooming screen is enlarged 4 times, and when pressed twice, it is enlarged 16 times. Then, if pressed again, the basic screen remains the same. In other words, 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. 4 times (or 16 times) magnification of this screen means that the main control unit 8 reads one pixel four times (or 16 times) consecutively for all the pixels of the basic zooming screen, and displays the zooming screen enlarged by the pixels. You can configure it.

Thereafter, the main controller 8 controls to display the enlarged or reduced zooming screen. That is, the pixel data of the basic zooming screen configured according to the position selection is read out enlarged or reduced and applied to the video output unit 50 through the video decoder 44 and the smoothing filter 48. The smoothing filter 48 smoothly processes the roughened screen according to the enlargement of the screen. Therefore, the user can select a specific portion of the desired screen by using only the remote controller 52, and can enlarge or reduce the selected specific portion.

If the user does not adjust the zooming magnification using the remote controller 52 in step 106 of FIG. 5, the main controller 8 controls to display only the basic zooming screen configured according to the position selection in step 112.

In the above-described detailed description of the present invention, the main controller 8 directly controls the frame memory 46. However, even if the main controller 8 provides information to the video decoder 44 and the video decoder 44 controls the frame memory 46, the zooming function may be implemented. It is possible.

In the above description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be defined 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 a separate circuit, and a user can easily use the zooming function using a remote controller. In particular, you can use the remote control to select a specific part of the screen you want to zoom in, and you can also adjust the zooming ratio for that particular part. In addition, in the present invention, since the screen roughened due to the enlargement of the screen is filtered using a smoothing filter, the gray matter is improved.

Claims (6)

In the digital image processing apparatus including a frame memory for storing one screen as a frame unit screen in the screen zooming implementation method, A first step of setting the size of the basic zooming screen for zooming to one-fourth the size of the frame screen; A second step of mapping a specific position of a frame screen to be selected for zooming with a key value position on the remote control panel; A third process of configuring a basic zooming screen centering on a position of a frame screen corresponding to the input key value when the user inputs a key value on the remote control panel for zooming; And a fourth process of reading the pixel data belonging to the configured basic zooming screen from the frame memory and displaying the pixel data. The zooming function of claim 1, further comprising: expanding or reducing the configured basic zooming screen to a zooming magnification when the user adjusts the zooming magnification by using a predetermined key of the remote control after the third process. . The method of claim 2, wherein the zooming magnification is 4 times or 16 times of the basic zooming screen. The zooming function of claim 3, wherein the basic zooming screen has a size of 360 × 240 pixels. The method of claim 3, further comprising smoothing and filtering the enlarged zooming screen when the enlarged zooming screen is displayed. The method according to any one of claims 1 to 5, wherein the zooming control is performed by a main controller of the digital image processing apparatus.