JP2004240373A - Display system capable of adjusting video parameter of user selecting region - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display system which is capable of adjusting video parameters of a user selecting region for video signals received from an image source device 10. <P>SOLUTION: Video parameters in a user selecting region among a complete image to be displayed are adjusted in the display system. The system includes a level detector 201 which detects a line pattern, a pattern receiver 204 which receives a pattern linked to the detector 201, a pixel counter 202 which is linked to the receiver 204 and measures a first horizontal coordinate value from a reference point of a starting pixel of the complete image to the end tip of a position indicator, a pattern analyzer 204 which computes a second horizontal coordinate value from the reference point to the end of the vertical surface of a video control region based on the first horizontal coordinate value and a video preamplifier 207 which is used to adjust at least one parameter among the video parameters of the video control region. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to display systems, and more particularly, to a display system for adjusting one or more video parameters of a user-selected area on a monitor screen.
[0002]
[Prior art]
2. Description of the Related Art Generally, a computer-related display system uses a cathode ray tube (CRT) monitor to display various types of data including video and text. Displaying video data such as motion pictures, graphics and photographs on the CRT monitor generally requires a very high level of luminance. This is because a variety of colors are used to provide lively shading and color changes.
Further, when the luminance range of video data is increased on a CRT monitor, the contrast and luminance of a video image become diversified, so that the image quality can be improved.
[0003]
[Problems to be solved by the invention]
However, when displaying the video data, existing computer-related display systems, including CRT monitors, did not provide sufficient brightness compared to TV systems.
For example, when a video signal for a TV system (for example, a broadcast video signal or other TV screen display signal) is displayed on a CRT monitor, the brightness of the displayed image is generally too low to be blurred. No, the picture is too dark.
[0004]
This is because the brightness parameters of existing computer-related display systems are usually much lower than those of TV systems.
In order to solve the above problem, it is highly desirable to increase the brightness of the user selected area while keeping the brightness of other areas relatively low on the CRT screen.
Therefore, the image quality of the area selected by the user can be greatly improved without increasing the brightness of the entire screen.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a display system for adjusting a video parameter of a user selection area by compensating for a delay generated between a video signal received from an image source device and a horizontal synchronization signal.
[0006]
Another object of the present invention is to provide a display system for adjusting a video parameter of a user-selected area, which can compensate for a vertical offset due to different display settings between a display device and an image source device.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, in a display system for adjusting a video parameter of a user selected area in a displayed complete image, a level detection for detecting a line pattern included in any of a plurality of image lines representing the complete image. A pattern receiver coupled to the level detector and receiving a pattern including a position indicator whose end is aligned perpendicular to an edge of a vertical plane of the user-selected area; coupled to the pattern receiver; A pixel counter for measuring a first horizontal coordinate value from the reference point of the first starting pixel of the image line at the top of the image to the end of the position indicator; a video control area from the reference point based on the first horizontal coordinate value To calculate the second horizontal coordinate value up to the edge of the vertical plane Over emissions analyzer; characterized in that it comprises a video preamplifier for adjusting at least one of the video parameters of the video control area.
[0008]
In addition, the present invention further includes a line counter connected to the pattern receiver for measuring a vertical offset distance between the reference point and a line including the pattern, wherein the pattern analyzer includes an offset distance. Are added to the first vertical coordinate values, respectively, to further calculate a second vertical coordinate value from a reference point to an end of the horizontal plane of the control area.
[0009]
A display system according to the present invention includes a level detector for detecting a line pattern included in any of a plurality of image lines representing a complete image; an end connected to the level detector, the end of the level detector being a vertical end of a user selection area. A pattern receiver for receiving a pattern including a position indicator aligned vertically with respect to the pattern receiver; coupled to the pattern receiver, the end of the position indicator from the reference point of the first starting pixel of the top image line of the complete image A pixel counter for measuring a first horizontal coordinate value up to: a pattern receiver for calculating a second horizontal coordinate value from the reference point to the edge of the vertical plane of the video control area based on the first horizontal coordinate value; Monitor microprocessor coupled to input pixel frequency information to the pixel counter; Characterized in that it comprises a video preamplifier for adjusting at least one of the video parameters of the control region.
[0010]
The invention further includes a line counter coupled to the pattern receiver for measuring a vertical offset distance between the reference point and the line containing the pattern, wherein the monitor microprocessor further comprises: Are added to the first vertical coordinate values, respectively, to further calculate a second vertical coordinate value from a reference point to an end of the horizontal plane of the control area.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0012]
FIG. 1 is a view showing an image display system according to the present invention.
As shown in FIG. 1, a display system according to the present invention includes an image source device 10 (for example, a computer) that generates a video signal (RGB signal) and horizontal and vertical synchronization signals (H-SYNC, V-SYNC). And a CRT monitor 20 that receives an RGB signal and a SYNC signal from the image source device 10 and displays an image in response to the received RGB and SYNC signals.
[0013]
The image source device 10 receives information representing the active image and adds an application 12 (eg, an installed program or driver) to the top image line of the active image, and an active 12 to which the line pattern is added. And a video card 11 for receiving video information representing the image and generating a video signal and the H-SYNC and V-SYNC. Here, the line pattern includes information on coordinate values from the reference point (Po ') on the active image to the user-selected area.
[0014]
On the other hand, the CRT monitor 20 includes a panel key 24, a monitor CPU 22 (for example, a microprocessor), a video control unit 21, a main video amplifier 23, and a CRT 25.
[0015]
The video control unit 21 first receives the RGB signal and the SYNC signal from the video card 11 and determines the coordinate values from the reference point (Po ″) of the complete image actually displayed on the CRT 25 to the video control area. The video control unit 21 adjusts video parameters including brightness, contrast, sharpness, and emphasis of the user selection area, and controls the horizontal coordinate value (pixel) from the reference point (Po ″) to the edge of the vertical plane of the user selection area. ) Is received from the monitor CPU 22 so as to appropriately measure the pixel frequency. Finally, the panel keys 24 receive commands from the user to control the display settings of the CRT monitor 20, and the main video amplifier 23 amplifies the processed RGB signals from the video controller 21. Thereafter, the CRT 25 displays the amplified signal.
[0016]
FIGS. 2 and 3 are a first embodiment and a second embodiment showing the video control unit 21 of the CRT monitor 20 shown in FIG.
The video controller 21 of FIG. 2 includes a level detector 201 for detecting a line pattern included in any of a plurality of image lines representing a complete image displayed on the CRT 20 shown in FIG. 5, and a detected line pattern. And a pattern receiver 204 coupled to the level detector 201 for receiving
The received line pattern includes a position indicator and information on a vertical coordinate value from a line including the pattern to an end of a horizontal plane of the user selection area. Here, both edges of the position indicator are vertically aligned with the vertical plane edge of the user selection area.
[0017]
The video control unit 21 also controls a pixel counter 202 connected to the pattern receiver 204 to measure a horizontal coordinate value from the reference point of the first start pixel of the top line of the complete image to the edge of the position indicator. And a line counter 203 coupled to the pattern receiver 204 for measuring a vertical offset distance between the reference point and the line containing the pattern.
[0018]
Next, the pattern analyzer 205 calculates the horizontal coordinate value from the reference point to the edge of the vertical plane of the video control area based on the horizontal position of the position indicator (the horizontal coordinate value from the reference point to the edge of the position indicator). Then, the vertical coordinate value from the reference point to the edge of the horizontal plane of the control area is calculated by adding the offset distance and the vertical coordinate value to the edge of the horizontal plane included in the pattern.
[0019]
Finally, the video controller 21 includes a gain controller 206 for setting a video control gain for the control region based on a predetermined set of video parameter values included in the line pattern, and a video preamplifier for amplifying the RGB signals. 207.
[0020]
The video control unit 21 shown in FIG. 3 is the same as the video control unit 21 shown in FIG. 2 except that the pattern analyzer 205 is omitted. Therefore, the monitor CPU 22 calculates the coordinate values from the reference point to the control area in the same manner, and the gain control unit 206 sets the video control gain from the control area. In this way, the configuration of the video control unit 21 is greatly simplified.
[0021]
FIG. 4 is a diagram illustrating an example of an active image displayed based on video information generated from an application of a PC. The application unit 12 of the image source device 10 allows a user to select a predetermined area (the rectangular box shown in FIG. 4) and adjust one or more video parameters of the selected area. For example, the predetermined area is clicked on the upper left corner of the predetermined area with a mouse pointer controlled by a mouse (not shown) connected to the image source device 10, and the lower right corner of the predetermined area is clicked. Can be selected by dragging the pointer up to. The predetermined area can also be easily determined by clicking on at least one window currently displayed on the monitor screen or pressing one or more key buttons provided on a keyboard (not shown). Can be selected.
[0022]
When the user selects a predetermined area, the application unit 12 measures and stores information on the coordinate values of the selected area. The information includes V_START and V_END representing a vertical coordinate value from a reference point of the active image (for example, Po shown in FIG. 4) to an end of a horizontal plane of the user selection area. Further, the application unit 12 further includes H_START and H_END representing horizontal coordinate values from the reference point (Po) to the edge of the vertical plane of the selected area, and these values adjust the video parameters of the user selected area according to the present invention. It is not always required to do so. The vertical coordinate values stored by the application unit 12 are in units of lines, whereas the horizontal coordinate values are in units of pixels. This is because the vertical and horizontal coordinate values of an arbitrary point on the active image use a line and pixel unit coordinate system, respectively.
[0023]
After the application unit 12 obtains the necessary coordinate information, the application unit 12 adds one line pattern to the top line of the active image.
The line pattern includes pattern data including coordinate information (V_START, V_END) of the user selection area, a control code, and a pattern authentication code (for example, a checksum). The line pattern further includes a horizontal coordinate value from the reference point (Po) to the user selection area. The control code is a code including video control parameters for brightness, contrast, sharpness, enhancement, and the like.
[0024]
The application unit 12 confirms that the pattern data transmitted by the video control unit 21 or the monitor CPU 22 has not been changed during data transmission, and prevents any non-pattern part of the video signal from being recognized as pattern data. Therefore, by including a data authentication code such as a checksum, appropriate transmission of pattern data is ensured.
[0025]
In general, the checksum is a number that can be determined by the application unit 12 and the monitor CPU 22 (or the video control unit 21) and that represents the sum of representative values of all texts in the transmitted pattern data. The monitor CPU 22 can authenticate the pattern data included in the line pattern by comparing the checksum included in the pattern data with the newly determined checksum.
[0026]
Referring to FIG. 1 again, the video card 11 of the image source device 10 controls the operation of the CRT monitor 20 after receiving the image information defining the active image to which the pattern is added from the application unit 12 and displays the image. For this purpose, an RGB signal and horizontal and vertical synchronization signals (H_SYNC, V_SYNC) are generated. Next, the video controller of the CRT monitor 20 receives the RGB and SYNC signals and adjusts at least one of the brightness, contrast, sharpness and enhancement parameters for the user selected area based on the parameter values of the predetermined set of control codes. I do. Thereafter, the amplified RGB signals are transmitted to the main video amplifier 23 for amplifying the RGB signals, and the CRT 25 displays the amplified RGB signals.
[0027]
FIG. 5 is a diagram illustrating an example of a complete image displayed based on the RGB signal and the SYNC signal received from the video card 11.
Referring to FIG. 5, the complete image actually displayed on the CRT 25 does not exactly match the active image shown in FIGS. 4 and 5, but has different display settings between the CRT monitor 20 and the application unit 12. Or an image slightly larger than the active image depending on the coordinate system.
[0028]
For example, the coordinate system used to represent the position of a point on the complete image shown in FIG. 5 may be different from the active image shown in FIG.
That is, the position of an arbitrary point on the complete image is measured with respect to a reference point (for example, Po ″) on the complete image which is not the reference point (Po ′) on the active image. Frequently, a delay occurs between the RGB signal and the SYNC signal received from the card 11. Due to such a delay, a coordinate mismatch between the complete image and the active image is more likely to occur.
[0029]
FIG. 6 shows signals for V-SYNC, H-SYNC, and one line pattern that the video control unit 21 receives from the video card 11. As described above, the video signal corresponding to the uppermost line of the active image includes one pattern signal. Pattern signals include PCLOCK, PDATA, and PWINDOW signals, each of which may be included in an RGB signal.
Hereinafter, FIGS. 5 and 6 will be described in more detail.
[0030]
Hereinafter, the operation of the image display apparatus according to the present invention shown in FIGS. 1 to 3 will be described in detail.
[0031]
First, the video preamplifier 207 and the level detector 201 start receiving RGB signals, H-SYNC and V-SYNC signals from the video card 11 of the image source device 10.
Referring again to FIG. 6, the line counter 203 initially detects the first V-SYNC pulse and the first H-SYNC pulse at time T1. The detected sync pulse represents the start point (Po ″) of the uppermost video line of the complete image shown in Fig. 5. Between T1 and T2, the line counter 203 of the video control unit 21 keeps H until time T2. Continue counting the number of video lines of the complete image by detecting more SYNC pulses.
[0032]
At time T2, the line counter detects an H-SYNC pulse corresponding to the start point of the video line of the complete image including the line pattern. Thereafter, the pattern receiver 204 of the video control unit 21 detects the first rising edge of the PCLOCK signal at time T3. At this time, the pattern receiver 204 determines V_OFFSET representing the number of video lines detected by the line counter 203 between times T1 and T2. That is, V_OFFSET indicates a vertical coordinate value between the top line of the complete image and the image line including the pattern, as shown in FIG.
[0033]
Further, the pattern receiver 204 extracts pattern data from the PDATA signal received from the level detector 201. The PDATA signal is a signal having “0” or “1” based on the pattern data, as shown in FIG. Thus, the extracted pattern data includes V_START, E_END, control code, and checksum. V_START and V_END indicate the vertical coordinate values from the reference point of the active image (for example, Po ′ shown in FIG. 4) to the end of the horizontal plane of the user selection area. The control code is a code that includes other types of video parameters such as brightness, contrast, sharpness, and emphasis that highlight the user-selected area. The checksum is a pattern authentication code for the pattern receiver 204 or the monitor CPU 22 to authenticate the received pattern data.
[0034]
Also, the pattern signal received by the pattern receiver 204 from the level detector 201 includes a PWINDOW signal indicating a horizontal coordinate value from Po ″ to the user selection area as shown in FIG. The receiver 204 detects a rising edge of the PWINDOW signal at time T4, and then the pattern receiver 204 uses a pixel counter that counts the number of pixels present between times T2 and T4 to Po ″. Then, RCV_H_START indicating horizontal coordinate values up to the left side surface of the user selection area shown in FIG. 5 is determined. The pixel counter 202 uses the pixel frequency information provided by the monitor CPU 22 to count each pixel. Thereafter, the pattern receiver 204 uses the pixel counter 202 to determine the RCV_H_END representing the horizontal coordinate value from Po ″ to the right side of the user selected area shown in FIG. 5. Again, the pixel counter 202 uses the time T2, T5, Count the number of pixels present between.
[0035]
When all V_OFFSET, REC_H_START, and REC_H_END are determined and the pattern data is completely received, the pattern receiver 204 transmits the determined position value to the pattern analyzer 205 or the monitor CPU 22.
Thereafter, the pattern analyzer 205 or the monitor CPU 22 checks whether the pattern data is valid by comparing the checksum included in the pattern data with the newly determined checksum. If it is confirmed that the pattern data is not valid, the pattern analyzer 205 or the monitor CPU 22 ignores the determined position value. When it is determined that the pattern data is valid, the pattern analyzer 205 or the monitor CPU 22 uses the following formula to change the position from Po ″ to the video control area (that is, the target area) as shown in FIG. Calculate coordinate values.
WIN_V_START = V_OFFSET + V_START,
WIN_V_END = V_OFFSET + V_END,
WIN_H_START = RCV_H_START,
WIN_H_END = REV_H_END,
V_BLANKPOS = V_OFFSET.
[0036]
FIG. 7 is a diagram illustrating a video control area based on coordinate values calculated by the above formula. As shown in FIG. 7, WIN_V_START and WIN_V_END represent vertical coordinate values from Po ″ to the upper and lower surfaces of the control area, and WIN_H_START and WIN_H_END represent horizontal coordinate values from the same reference point to the end of the vertical plane of the control area. V_BLANKPOS represents the vertical coordinate value of the video line of the complete image that can be selectively erased, and by erasing the video line of the complete image including the top video line of the active image shown in FIG. The user does not observe the line pattern on the screen of the monitor.
[0037]
When the video control region is completely identified by determining all required position values of the control region, the gain control unit 206 is identified based on a predetermined set of video parameter values included in the control code. Set the gain for the control region. Finally, the video preamplifier 207 amplifies the corresponding RGB signal.
[0038]
Meanwhile, WIN_H_START and WIN_H_END may be determined using the following equation.
WIN_H_START = RCV_H_START + HDELAY1, and WIN_H_END = RCV_H_END + HDELAY2
Here, HDELAY1 and HDELAY2 represent additional correction values for compensating for a delay occurring between the input and output of the gain control unit 206 when amplifying the gain of the identified user selection area.
[0039]
【The invention's effect】
As described above, according to the display system according to the present invention, by adjusting the video parameters of the region selected by the user, the delay generated between the video signal received from the image source device and the horizontal synchronization signal is reduced. Can compensate. Thus, the image quality of the area selected by the user can be greatly improved without increasing the brightness of the screen of the entire monitor.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of an image display system according to the present invention.
FIG. 2 is a diagram illustrating a configuration of a video control unit of FIG. 1 according to a first embodiment.
FIG. 3 is a diagram illustrating a configuration of a video controller of FIG. 1 according to a second embodiment.
FIG. 4 is a diagram illustrating an example of an active image displayed based on video information generated from an application of a PC.
FIG. 5 is a diagram illustrating an example of a complete image displayed based on a video signal and a synchronization signal.
FIG. 6 is a diagram illustrating a line pattern signal and a synchronization signal.
FIG. 7 is a diagram illustrating a position of a video control area.
[Explanation of symbols]
10 image source device 11 video card 12 application 20 CRT monitor 21 video controller 22 monitor CPU
23: Main video amplifier 24: Panel key 25: CRT
201 level detector 202 pixel counter 203 line counter 204 pattern receiver 205 pattern analyzer 206 gain controller 207 video preamplifier

Claims (20)

In a display system for adjusting video parameters of a user-selected area of a displayed complete image,
A level detector for detecting a line pattern included in any of a plurality of image lines representing a complete image;
A pattern receiver coupled to the level detector for receiving the pattern including a position indicator whose end is vertically aligned with an edge of a vertical plane of the user-selected area;
A pixel counter coupled to the pattern receiver for measuring a first horizontal coordinate value from a reference point of a first starting pixel of the image line at the top of the complete image to an end of the position indicator;
A pattern analyzer for calculating a second horizontal coordinate value from the reference point to an end of a vertical plane of the video control area based on the first horizontal coordinate value;
A display system, comprising: a video preamplifier for adjusting at least one of video parameters of the video control area. The display system according to claim 1, wherein the video parameter is one of a luminance, a contrast, an emphasis, and a sharpness parameter. The display system according to claim 1, wherein the second horizontal coordinate value is the same as the first horizontal coordinate value. The display system of claim 1, wherein the video preamplifier adjusts at least one of the video parameters based on a predetermined video parameter value included in the received pattern. The display system of claim 1, wherein the pattern analyzer authenticates the pattern by checking a checksum included in the received pattern. The display system according to claim 5, wherein the pattern analyzer calculates the second horizontal coordinate value only when the pattern is authenticated. The first horizontal coordinate value is measured by counting pixels located between a second starting point of the image line including the pattern and an end of the indicator, and the first and second horizontal coordinate values are measured. The display system of claim 1, wherein the second starting point is vertically aligned. The display system according to claim 1, wherein the pattern includes first vertical coordinate values from a line including the pattern to upper and lower surfaces of the user selection area. 9. The apparatus of claim 8, further comprising a line counter connected to the pattern receiver for measuring a vertical offset distance between the reference point and a line including the pattern. Display system. The pattern analyzer further calculates a second vertical coordinate value from the reference point to an end of a horizontal plane of the control area by adding the offset distance to the first vertical coordinate value. Item 10. The display system according to Item 9. In a display system for adjusting video parameters of a user-selected area of a displayed complete image,
A level detector for detecting a line pattern included in any of a plurality of image lines representing a complete image;
A pattern receiver coupled to the level detector for receiving the pattern including a position indicator whose end is vertically aligned with an edge of a vertical plane of the user-selected area;
A pixel counter coupled to the pattern receiver for measuring a first horizontal coordinate value from a reference point of a first start pixel of an image line at the top of the complete image to an end of the position indicator;
The pixel counter is connected to the pattern receiver to calculate a second horizontal coordinate value from the reference point to an edge of a vertical plane of a video control area based on the first horizontal coordinate value. A monitor microprocessor for inputting;
A display system, comprising: a video preamplifier for adjusting at least one of video parameters of the video control area. The display system of claim 11, wherein the video parameter is one of a luminance, contrast, enhancement, and sharpness parameter. The display system of claim 11, wherein the second horizontal coordinate value is the same as the first horizontal coordinate value. The display system of claim 11, wherein the video preamplifier adjusts at least one of the video parameters based on a predetermined video parameter value included in the received pattern. The display system of claim 11, wherein the monitor microprocessor authenticates the pattern by checking a checksum included in the received pattern. The display system according to claim 15, wherein the monitor microprocessor calculates the second horizontal coordinate value only when the pattern is authenticated. The first horizontal coordinate value is measured by counting pixels located between a second starting point of the image line including the pattern and an end of the indicator, and the first and second horizontal coordinate values are measured. The display system of claim 11, wherein the second starting point is vertically aligned. The display system of claim 11, wherein the pattern further includes a first vertical coordinate value from a line including the pattern to an end of a horizontal plane of the user selection area. 20. The apparatus of claim 18, further comprising a line counter connected to the pattern receiver for measuring a vertical offset distance between the reference point and a line including the pattern. Display system. The monitor microprocessor may further calculate a second vertical coordinate value from the reference point to an end of a horizontal plane of the control area by adding the offset distance to the first vertical coordinate value. Item 20. The display system according to item 19.

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