KR0151441B1 - Image enlarging apparatus of image processing system - Google Patents

Abstract

1. TECHNICAL FIELD The invention described in the claims pertains to an image processing system, and more particularly, to a circuit for selecting and expanding a specific portion of an image signal displayed on a display.

2. Problems to be Solved by the Invention: Although image processing apparatuses such as wide TVs have functions of horizontal compression and vertical magnification, the user cannot designate and enlarge an image of a part of the integrated display screen. The present invention provides a device that can enlarge and display a portion of a video screen to be displayed.

3. Summary of the Invention The horizontal and vertical magnification information corresponding to the designation of the magnification section of the cover image signal is generated. Then, the image of the desired portion of the image signal from the outside is enlarged in accordance with the horizontal and vertical magnification information. Horizontal magnification of the video signal is performed at high speed using a line memory, and read out at low speed. In addition, vertical magnification of the video signal is performed by using a field memory to record at high speed, and read out at low speed. At this time, the designation of the recording section of the video signal to be stored in the line memory and the field memory uses the horizontal and vertical magnification information.

4. Significant use of the invention: image magnification device, image zoom device of the image processing system.

Description

Image Magnification Device of Image Processing System

1 is a block diagram of an image magnification apparatus of an image processing system according to the present invention;

FIG. 2 is a detailed circuit diagram of the enlargement section selection unit shown in FIG.

3 is a circuit diagram of a temporary example of the horizontal, vertical magnification and double scan portions shown in FIG.

4 is an operational waveform diagram of the horizontal enlargement unit shown in FIG.

5 is an operational waveform diagram of a horizontal enlargement unit shown in FIG.

6 is an operation waveform diagram of the double scan unit shown in FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing system, and more particularly, to an image magnification apparatus of an image processing system that can enlarge and display an image of a desired portion of a screen displayed on a monitor or the like.

Currently, an image processing system such as a digital television or a video cassette tape recorder (VCR) that digitally processes an image signal has many functions. For example, processing of a still picture, picture in picture, still picture, and the like are provided. However, the general image processing system does not have a function of selecting and enlarging a portion of a portion of the display image and thus cannot enlarge and view a specific portion of the still image.

On the other hand, wide TVs have a function of horizontally compressing an image signal and vertically expanding the image signal, but the user selects a desired display portion, that is, an image of a portion of the screen displayed on the monitor, and then horizontally. , Could not expand vertically. Thus, a problem arises in that the various functions provided by the image processing system cannot be fully utilized. For example, a case where a specific portion of the still image is enlarged and cannot be viewed.

Accordingly, an object of the present invention is to provide an image magnification apparatus of an image processing system that can select and enlarge a specific portion of a display screen.

Another object of the present invention is to provide an enlargement section selection device for generating information for enlarging an image of a specific portion in response to screen selection information selected by a user.

Still another object of the present invention is to provide a screen magnification apparatus which prevents deterioration of a screen when the screen is enlarged.

According to the present invention for achieving the above object, an enlargement section setting for generating horizontal magnification information and vertical magnification information corresponding to screen selection information having coordinates and outputting a double scan control signal corresponding to the generated magnification information Means, and horizontal magnification means for selecting and expanding only a video signal of a horizontal area corresponding to the generated horizontal magnification information among video signals input from the outside, and a vertical area corresponding to the generated vertical magnification information of the horizontal magnified image signal. Horizontal magnification means for selecting and enlarging only the video signal of the video signal; and storing the enlarged video signal in different storage areas in response to the double scan control signal, and storing the magnified video signal stored in the storage areas at different periods. Characterized in that it comprises a double scan means for output at high speed.

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

1 is a block diagram of an image magnification apparatus of an image processing system according to the present invention. In FIG. 1, reference numeral 12 is an enlargement section selector for outputting horizontal enlargement information HST and vertical enlargement information VST corresponding to input of screen selection information SI, and reference numeral 14 denotes a digital input from the outside. A horizontal magnification unit for enlarging a horizontal image of an image signal V _Data in correspondence with the horizontal magnification information HST, and 16 denotes an image signal horizontally magnified by the horizontal magnification unit 14. It is a vertical enlargement portion 16 that vertically enlarges to a size corresponding to. Reference numeral 18 is a double scan unit which double-scans the enlarged image signal output from the vertical enlargement unit 16 by the double scan control signal DSC to output the enlarged double scan image signal DSV. .

In the configuration of FIG. 1, WC1, WC2 and WC3 are first, second and third write clocks, and RC1, RC2 and RC3 are first, second and third read clocks. In this case, the first write clock WC1 is at least about twice as high as the frequency of the first read clock RC1, and the frequency of the second write clock WC2 is also at least about the frequency of the second read clock RC2. 2 times higher frequency. The third read clock RC3 supplied to the double scan unit 18 is a high frequency having a frequency approximately twice that of the third write clock WC3.

FIG. 2 is a detailed circuit diagram of the enlargement section selector 12 shown in FIG. 1, and analyzes screen selection information SI having a coordinate value and horizontally enlarges information HST corresponding to the screen selection information SI. And a microprocessor (hereinafter referred to as MPU) 20 for outputting each of the vertical magnification information VST to the horizontal magnification 14 and the vertical magnification 16 and simultaneously outputting a double scan control signal DSC. And a first counter 22 for counting the pixel clock Pc to output the position value of the pixel of the current horizontal line, and a second counter for counting the horizontal synchronizing signal Hs to output the vertical position value of the current video signal. Counter 24, the horizontal magnification information HST and the horizontal position value output from the first counter 22 are compared, respectively, and a horizontal write reset signal LMWR (Line memory write reset) and horizontal write interval control. Signal LMWE (line memory write enable) and horizontal read reset signal LMRR (Line m) The horizontal magnification coordinate signal generator 26 for generating an emory read reset and the vertical position reset signal FMWR by comparing the vertical magnification information VST and the vertical position value output from the second counter 24 are compared. To the vertical magnification coordinate signal generator 28 for generating a field memory write reset, a vertical write interval control signal FMWE, and a vertical read reset signal FMRR. Consists of.

In the above configuration, the horizontal magnification coordinate signal generating unit 26 includes a horizontal read time control signal Zh, a horizontal write time control signal Xh and a horizontal write end control signal Yh included in the horizontal magnification information HST. ) Is input to each one terminal, and the horizontal position value output from the first counter 22 is compared to each other terminal. When the two values are the same, the horizontal read reset signal LMRR and the horizontal write are recorded. The first and second comparators 30 and 32 outputting the reset signal LMWR to the horizontal enlargement unit 14, respectively, included in the horizontal recording time control signal Xh and the horizontal enlargement information HST. A horizontal recording end control signal (Yh) is input to one terminal and the horizontal position value output from the first counter 22 is compared with a window so that the horizontal position value is the horizontal recording time control signal (Zh) and the horizontal recording end. Horizontal recording sphere when the value is between the control signals Yh And a third comparator 34 which outputs the liver control signal LMWE to the horizontal enlargement section 14.

The vertical magnification coordinate signal generation unit 28 respectively outputs the vertical read point control signal Zv, the vertical write point control signal Xv and the vertical write end control signal Yv included in the vertical magnification information VST. A vertical read reset signal (FMRR) and a vertical write reset signal when the two values are equal by comparing the vertical position values inputted to one terminal of the terminal and outputted from the second counter 24 to the other terminals. The fourth and fifth comparators 36 and 38 which respectively output the FMWR to the vertical magnification section 16, and the vertical recording end included in the vertical recording time control signal Xv and the vertical magnification information VST. The control signal Yv is input to one terminal and the vertical position value outputted from the second counter 24 is compared with the window so that the vertical position value is the vertical write time control signal Zv and the vertical write end control signal ( When the value is between Yv) It consists of a signal (FMWE) a sixth comparator (34) for outputting to the vertical enlargement unit 16.

FIG. 3 is a circuit diagram of a temporary example of the horizontal and vertical magnifications 14 and 16 and the double scanning unit 18 shown in FIG. 1, wherein the configuration of the horizontal magnification 14 shown in FIG. 1 is a single line. It is configured as a line memory, and the configuration of the vertical magnification section 16 is configured as a single field memory, and the double scan section 18 is an image enlarged from the vertical magnification section 16. Two line memories 42 and 44 which record signals simultaneously and output video signals stored by read control signals input at different periods are configured in parallel connection.

4 is an operation waveform diagram of the horizontal enlargement unit 14 shown in FIG.

5 is an operation waveform diagram of the horizontal enlargement unit 16 shown in FIG.

6 is an operation waveform diagram of the double scan unit 18 shown in FIG.

Hereinafter, an operation of one embodiment of FIG. 1 according to the present invention will be described in detail with reference to FIGS. 2 to 6.

Now, when the screen selection information (SI) which designates the coordinates of the image for enlarging the image of a specific portion among the screens displayed on the monitor (not shown) is input to the enlargement section selection section 12, the MPU 20 ) Analyzes the input screen selection information SI and outputs the horizontal magnification information HST, the vertical magnification information VST, and the double scan control signal DOC corresponding thereto.

The screen selection information (SI) is a selection signal for selecting a specific image of a screen displayed on the current display (CRT) as information input from the outside by the user's selection. The selection signal may be generated by manipulating a key located in a key canal of a remote controller or an image processing apparatus. The act of selecting a specific image from the displayed screen may be performed by moving a cursor to designate a window of the enlarged image, and the designation of such coordinate values may be easily performed by those skilled in the art.

The horizontal magnification information HST output from the MPU 20 in the magnification section selector 12 is a horizontal recording time point that is a coordinate value for setting a horizontal image window for selectively recording a horizontal image signal of the designated coordinate values. The control signal Xh, the horizontal write end control signal Yh, and the horizontal read time control signal Zh are included. Among the various types of information as described above, each of the horizontal read point control signal Zh and the horizontal write point control signal Xh may be configured as a first, second, comparator 30, ( 32 is input to one terminal, and the horizontal recording start control signal Xh and the horizontal recording end control signal Yh are input to one terminal of the third comparator 34.

The other terminal of the first, second, and third comparators 30, 32, and 34 in the horizontal magnification coordinate signal generator 26 counts the pixel clock Pc of the current horizontal line and outputs a horizontal position value. The output of the first counter 22 is input. The first counter 22 is reset at the initial position of every horizontal line and outputs a value indicating the position of the current pixel of the horizontal line. At this time, the first comparator 30 and the second comparator 32 output a horizontal read time control signal Zh and a horizontal write time control signal Xh input to one input terminal from the first counter 22. The horizontal readout control signal LMRR and the horizontal write reset signal LMWR shown in FIG. 4 are output to the horizontal enlargement unit 14 when the two values are the same as compared with the horizontal position values. Here, the horizontal recording time control signal Xh is the start position of the horizontal magnification section of the selected video signal, and the horizontal reading time control signal LMRR is a control signal indicating the reading time point of the video signal recorded in the horizontal magnification 14. to be. The third comparator 34 simultaneously inputs the horizontal read time control signal Zh and the horizontal write time control signal Xh outputted from the MPU 20 to one terminal, and the first counter to the other terminal. A horizontal position value for selecting a horizontal image section to be enlarged when the horizontal position value is input between the horizontal read time control signal Zh and the horizontal write time control signal Xh by inputting a horizontal position value outputted from 22). The recording section control signal LMWE is output as shown in FIG. The third comparator 34 performing the above operation can be easily implemented as a window type comparator.

Each of the fourth and fifth comparators 36 and 38 in the vertical magnification coordinate signal generator 28 is a vertical read point control signal Zv included in the vertical magnification information VST output from the MPU 20. And the vertical recording time control signal Xv are input to each terminal. In addition, the sixth comparator 40 inputs the vertical write start control signal Xv and the vertical write end control signal Yv included in the vertical magnification information VST to one input terminal. At this time, the other terminal of the fourth, fifth, and sixth comparators 36 to 40 receives the output of the second counter 24 that counts the horizontal synchronization signal Hs and outputs a vertical position value. Accordingly, the fourth and fifth comparators 36 and 38 may have a vertical read reset signal FMRR and a vertical angle as shown in FIG. 5 when the values of the signals input to the one input terminal and the other input terminal are the same. The write reset signal FMWR is supplied to the vertical magnification section 16. The sixth comparator 40 outputs a second counter 24 input to the other terminal, a vertical read time control signal Zv and a vertical write time control signal Xv output from the MPU 20. The respective vertical position values output from the second counter 24 are compared with each other, and a vertical recording section control signal FMWE is output according to the comparison result. That is, when the vertical position value is between the vertical read time control signal Zv and the vertical write time control signal Xv, a vertical recording section control signal LMWE for selecting a vertical video section to enlarge is obtained. Output as shown in 5 degrees.

On the other hand, the horizontal magnification section 14 for inputting the control signals output from the magnification section selector 12 configured as shown in FIG. 2 is a transition (active low) of the horizontal recording section control signal LMWE as shown in FIG. In response, the digital image signal V _Data input from the outside is stored in the internal line memory by the first write clock WC1. As described above, the digital image signal V _Data stored in the line memory in the horizontal expansion unit 14 is synchronized with the first read clock RC1 after the horizontal read reset signal LMWR shown in FIG. It is output from the output terminal OUT1 of the horizontal enlargement part 14 similarly. In this case, the frequency of the first write clock WC1 is twice the frequency of the first read clock RC1. That is, the frequency of the first read clock RC1 is about 2 times lower than the frequency of the first write clock WC1. Accordingly, the digital image signal output from the horizontal enlargement unit 14 is horizontally enlarged as shown in FIG. 4 by the first read clock RC1 having a frequency lower than that of the first write clock WC1. Accordingly, the horizontal magnification unit 14 may display an image of a horizontal recording section by designating a horizontal recording time control signal Xh, which is an enlarged coordinate value, and a horizontal recording end control signal Yh among digital image signals V _Data input from the outside. It can be seen that only the signal is horizontally enlarged and output.

The digital video signal horizontally enlarged by the horizontal enlargement unit 14 is supplied to the input terminal IN2 of the vertical enlargement unit 16 connected in series. As described above, the vertical magnification unit 16 is horizontally enlarged and a signal output from the collection magnification left signal generator 28 of FIG. 2 by vertically inputting a horizontal image signal to the image signal input to the input terminal IN2. Zoom in vertically. That is, the vertical magnification section 16 designates a vertical video region of the magnification section among the video signals inputted by the vertical recording section control signal FMWE output from the vertical magnification coordinate signal generation section 28 of FIG. When the vertical write reset signal FMWR goes low as shown in FIG. 5 while the vertical write interval control signal FMWE goes low as shown in FIG. 5, the vertical enlargement unit 16 generates a second write clock WC1. In synchronism with this, the horizontally enlarged video signal is vertically recorded in the internal field memory. As described above, the image signal recorded in the vertical magnification unit 16 is output as an image signal vertically enlarged as shown in FIG. 5 in synchronization with the input of the second read clock RC2. At this time, since the frequency of the second read clock RC1 is a frequency lower than the frequency of the second write clock WC2 (it should be about two times lower than the frequency), the output of the video signal is vertically expanded and output. Therefore, some sections of the digital image signal V _Data input from the outside by the operation of the horizontal enlarger 14 and the vertical enlarger 16 as described above are horizontally and vertically enlarged so that the line in the double scan unit 18 is increased. The input terminals IN3 and IN4 of the memories 42 and 44 are input.

Each of the line memories 42 and 44 in the double scan unit 18 stores an image signal horizontally and vertically enlarged by a double scan control signal DSC output from the MPU 20 in an internal memory area. Double scan outputs the stored video signal.

Each of the line memories 42 and 44 when the line memory write control signal LMWE2 and the line memory write reset signal LMWR2 included in the double scan control signal DSC output from the MPU 20 are low. Stores an enlarged image signal output from the vertical magnification section 16 in synchronization with the third write clock WC3 in an internal line memory area. Each of the line memories 42 and 44 storing the enlarged image signal in the internal memory area as described above accesses and outputs the image data selectively stored by the output control signal output from the MPU 20. That is, when the line memory reset signal LMRR2 and the line memory read control signal LMRE2 (Line memory read enable) are output low as shown in FIG. 6, only the line memory 42 is the third read clock. In synchronism with RC3, a video signal horizontally and vertically enlarged is output to the output terminal OUT3.

If the line memory reset signal LMRR3 and the line memory read control signal LMRE3 are output low as shown in FIG. 6, only the line memory 44 is synchronized with the third read clock RC3. The video signal is horizontally and vertically enlarged as shown in FIG. 6 to the output terminal OUT4. The frequency of the third read clock RC3 is about two times higher than the recording frequency of the third write clock WC3. Therefore, since one horizontal image signal is output at a high speed, the output is possible at a high speed, thereby enabling double scan. Such a double scan is to minimize image deterioration during scanning by enlarging an image signal, and the horizontal and vertical magnified images can be reproduced and displayed on a screen without the operation of the double scan.

As described above, the present invention allows the user to select a portion of the screen displayed on the display to enlarge only a portion of the image signal so that the image of the minute portion can be viewed in detail, which can be widely used in various fields of the image processing system. have.

Claims (7)

An image magnification apparatus of an image processing system, comprising: generating horizontal magnification information and vertical magnification information respectively specifying horizontal and vertical start and end points to be enlarged corresponding to screen selection information having coordinates, An enlargement section setting means for outputting a corresponding double scan control signal, and an image signal of a horizontal region corresponding to the generated horizontal enlargement information among the image signals input from the outside is selected and recorded in line memory in synchronization with a recording clock; Horizontal magnification means for horizontally extending and outputting the video signal recorded in the line memory in synchronization with a readout clock having a frequency lower than a recording frequency, and a vertical area of the horizontal magnification video signal corresponding to the generated vertical magnification information. Unit of vertical line in synchronization with recording clock by selecting only video signal Vertical magnification means for outputting a video signal recorded in the field memory and horizontally enlarged and recorded in the field memory in a vertically expanded video signal in synchronization with a read clock; and in response to input of the double scan control signal and a write clock. And a double scan means for storing the enlarged image signal in different storage regions, and outputting the enlarged image signal stored in the storage regions at high speed at different periods as a read clock having a higher frequency than the recording clock. Image magnification apparatus of the image processing system, characterized in that. The apparatus of claim 1, wherein the enlargement section setting means analyzes input of screen selection information having coordinates and outputs a recording time control signal, a recording time control signal, and a reading time control signal in a horizontal and vertical section, respectively, and simultaneously doubles the input. A microprocessor for generating a scan control signal, a first counter for counting a pixel clock to output a horizontal position value of the current video signal, and a second counter for counting a horizontal sync signal and outputting a vertical position value of the current video signal; A horizontal magnification coordinate signal generator for generating a horizontal recording reset signal, a horizontal recording section control signal, and a horizontal read reset signal by comparing the control signals of the horizontal section and the horizontal position values output from the first counter, respectively; And each of the control signals of the vertical section and the vertical position value output from the second counter. Compared to video magnifying apparatus of the image processing system, characterized by the coordinates composed of a vertical zoom signal generator for generating a vertical reset signal recording and perpendicular recording interval control signal and a vertical read reset signal. The horizontal zoom coordinate signal generator of claim 2, wherein the horizontal magnification coordinate signal generator inputs a read point control signal and a write point control signal of a horizontal section output from the microprocessor to one terminal thereof, and outputs the horizontal scale coordinate signal output from the first counter. A first comparator and a second comparator for outputting a horizontal read reset signal and a horizontal write reset signal when the values of the two signals of the two signals are the same by inputting a position value to the other terminal and comparing the signals of the two input terminals; And a third comparator for comparing the recording period control signal output from the microprocessor with the horizontal position value output from the first counter and outputting the horizontal recording control signal during the same period. Image magnification apparatus of an image processing system. 4. The vertical position control method of claim 3, wherein the vertical magnification coordinate signal generator inputs a read point control signal and a write point control signal of a vertical section output from the microprocessor to one terminal, and is output from the second counter. A fourth comparator and a fifth comparator for inputting a value to the other terminal and comparing the signals of the two input terminals and outputting a vertical read reset signal and a vertical write reset signal when the values of the two signals are the same; And a sixth comparator for comparing the recording period control signal output from the processor with the vertical position value output from the second counter and outputting the recording control signal during the same period. Enlargement device. The digital image signal according to claim 4, wherein the horizontal magnification means sequentially writes a digital video signal input from the outside in line with the first write clock in response to a horizontal write control signal output from the third comparator. And a first line memory configured to expand and output a horizontal line of the recorded digital image signal in synchronization with a first read clock in response to a horizontal read reset signal output from the first comparator. . The digital image signal of claim 5, wherein the vertical magnification means is further configured to move the digital image signal horizontally enlarged from the line memory in response to a horizontal write control signal output from the sixth comparator to an internal field memory region in synchronization with a second write clock. A field memory configured to sequentially record and expand and output the vertical of the recorded digital image signal in synchronization with a second read clock in response to a horizontal read reset signal output from the fourth comparator. Device. The apparatus of claim 5 or 6, wherein the double scanning means simultaneously records the image signals enlarged from the vertical enlargement means, and outputs the image signals stored by the read control signals inputted at different periods, respectively. And an apparatus for expanding an image processing system, wherein two line memories are connected in parallel.