CN1053779C - Signal processing for alternate-line scanning display - Google Patents
Signal processing for alternate-line scanning display Download PDFInfo
- Publication number
- CN1053779C CN1053779C CN93112935A CN93112935A CN1053779C CN 1053779 C CN1053779 C CN 1053779C CN 93112935 A CN93112935 A CN 93112935A CN 93112935 A CN93112935 A CN 93112935A CN 1053779 C CN1053779 C CN 1053779C
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- China
- Prior art keywords
- signal
- signal processing
- processing method
- scan line
- filtering
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
- G09G5/04—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using circuits for interfacing with colour displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
- G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
- G09G1/14—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible
- G09G1/16—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0224—Details of interlacing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Television Systems (AREA)
- Controls And Circuits For Display Device (AREA)
- Picture Signal Circuits (AREA)
Abstract
With the inventive signal processing method the output for each line of the video signal is created by summing a reduced intensity version of the current field and the filtered versions of the immediately adjacent field lines. The effect of applying the filter of a preferred processing means to a single pixel signal in line n is shown in the filter characteristic of the figure 3, the filter comprising a low-pass filter means which derives a low frequency Fourier component of the adjacent field lines that represents their brightness but not the fine details. This enables fine details to be preserved whilst substantially reducing flicker in the display.
Description
What the present invention relates to is the signal processing apparatus that is used to handle a kind of signal, and this signal is applicable to a kind of interlacing scan display unit, for example, a kind of simple monitor, a television set or show a vision signal that has write down, this signal has the clear degree of good cunning.For example, this signal is present in a kind of computer graphical signal.
What the present invention was concerned about is the scintillation that reduces dual-scan display.
As everyone knows, computer has a lead-out terminal that is connected with television set, makes television set can show computer graphical.For example, some is used for the display card that can produce progressive-scan signal or the video-game card of television set, and it has half of scan line of interlaced scan tv standard.Yet this has caused the reduction of vertical resolution, and the product of other other types can produce the interlacing computer graphical signal with as much number of scanning lines, but they have the shortcoming of flicker.
Known transducer has the input of a receiving computer figure signal, and this computer graphical signal has a higher horizontal sweep rate and the output that output signal is provided.This output signal is under a low horizontal sweep rate.Be suitable for as television video frequency signal, above-mentioned low scan rate is half of high scan rate just.Signal processing apparatus of the present invention can use with this transducer, or signal processing apparatus is inserted in the transducer.
The computer graphical output signal that is produced is usually as a kind of progressive-scan signal, and its horizontal frequency is two times of television standard.And total scan line with as much.Signal processing apparatus can be stored in several scan lines in the memory, and these several lines are to be used for the processing computer graphics output signal.In fact, the scan line of the processing of being exported is half of figure signal scan rate in the interlace mode, and it is used to provide television video frequency signal.
The needed lock-out pulse of television set is different with those lock-out pulses that are mixed in the computer graphical signal usually, but all relates to synchronously.The preferred signal processing apparatus that is made of conversion equipment can produce the television synchronizing pulse that meets respective standard.For example, these standards are used in standards such as NTSC, SECAM and PAL.
Should be appreciated that the television video frequency signal that is used for a color monitor not only comprises luminance signal but also comprise carrier chrominance signal usually.Lock-out pulse and red, green and blue computer graphical signal can enough standards integrated circuit mix, provide needed TV signal then.
We know, produce by computer or be the above-mentioned phenomenon that takes place owing to very different vision signal in strange, even field by the scintillation of the interleaved signal of computer output signal conversion.Because the brightness or color transformed can not the sudden change of most true pictures of on television set, showing, so be identical in the shown information of odd field and even field.The scanning element of television set is closeer than the interval between the scan line usually, and is therefore, for PAL and NTSC standard, every
Arrive
A color spot just appears second.This is just fast to being enough to provide a stable impression.Yet, the figure or the symbol of computer output only have a scan line so thin, under each other situation of the utmost point, in the zone that black and white horizontal scanning line is alternately arranged, one of them will show all white wires and another will show all black lines, and this zone is every
Second light once, this just identifies with eyes to being enough to slowly.
Designed anti-flicker filter is to use a kind of digital filter to come that balance is strange, the brightness of even field, and this digital filter is on the pixel that is applied in perpendicular to scan-line direction.To general television set, scan line is a level, and therefore, anti-flicker filter is employed in vertical direction.A kind of method in first to file (seeing Fig. 4 median filter shaping 1) joins present picture element brightness on half with half pixel brightness.At this moment, upper and lower moving all appears in each bright pixel of (or dark pixel or horizontal line under light ground) or horizontal line part under the influence of a pixel in field frequency under dark background.For for long horizontal line quite general in the graphical user interface, the polymerization campaign is clearly, a kind of method preferably (seeing Fig. 5 median filter shaping 2) in first to file, respectively increase the pixel brightness of thereon, down, thereby avoid long horizontal influence, any this anti-flicker filter based on the one dimension digital filter has to select a kind of compromise proposal between the inhibition degree of vertical resolution and flicker.A kind of traditional two-dimensional low-pass filter also can be used for eliminating scintillation under the cost of sacrificing resolution.A kind ofly in most of the cases can keep definition according to two dimensional filter of the present invention, before the pixel of front court (even number or odd number) is mixed, by to other (odd number or even number) thus pixel carry out low-pass filtering and eliminate scintillation.
A kind of signal processing apparatus according to use software of the present invention or use hardware, an input and an output that receives detail image is arranged, this device provides a kind of image that is suitable for interlaced video signal, this signal processing apparatus is added to after with the modulation of the figure signal of adjacent scanning lines on the current scan line and produces an output, described modulation then is before being added to current scan line, and the figure signal of adjacent scanning lines is carried out low-pass filtering.
The sort signal processing unit can substantially reduce the scintillation that occurs in the interlaced video signal display, can also keep the good definition of figure signal.
Total weighting of preferred low-pass signal is not more than the weighting than the center pixel after handling, and the figure signal definition that is used in a field (odd number or even number) of interlacing output signal is not covered by the luminance signals that another (corresponding even number or odd number) provides.
Like this, be used for the output signal of each, as odd field, its vision signal scan line be with constitute by odd field and added together by the form when the transmissive wave of front court and closely adjacent even field scan line of dimming and to generate.Filter comprises a low pass filter, and the low frequency of therefrom deriving an even field scan line is paid upright leaf component, its representative be the brightness of even field scan line, rather than details.
Below in conjunction with Figure of description 1～3 and embodiment, the present invention is further elaborated:
Fig. 1 is according to the demonstration of a kind of figure signal before the signal processing means processes of the present invention;
Fig. 2 is a figure signal shown in Figure 1 is equipped with resulting graphical display after the signal processing means processes with the filter of characteristic shown in Figure 3 according to the present invention through one;
Fig. 3, provide the chart of a filter characteristic and the effect that this wave filter is applied in a single pixel signal on the n line.
The description of filter characteristic formerly please refer to Fig. 4, Fig. 5.
Form shown in Figure 4 is a kind of simple filter characteristic.
Form shown in Figure 5 is a kind of improved simple filter characteristic.
For a stable television video frequency signal image is provided, is added on the current scan line of figure signal by scan line, thereby produces the interlaced line of interlaced video signal the low-pass type of untreated figure signal upper and lower.
The signal from the odd field to the even field or from the even field to the odd field that is increased can guarantee that the brightness in arbitrary zone in above-mentioned two fields is roughly the same.Therefore screen be field frequency (Phase Alternation Line system is 50Hz, and TSC-system is 60Hz) rather than under frame frequency (Phase Alternation Line system is 25Hz, and TSC-system is 30Hz) upgraded.Yet because the field of a low-pass type is only arranged, another details does not have influence to the details when the front court.
The filtering of signal can be that application software uses hardware to realize again, if application software, a kind of simple and easy video converter can access stable and visual clearly, and this transducer directly uses RGB conversion composite signal.If it is realize, stable and visual clearly even the character of light color also can produce on TV with hardware.
The vision signal that produces can be carried out low-pass filtering and mixing with analog filter cheaply and linear integrated circuit that discrete component is formed in odd field and even field, if in video frequencies, adopt the pixel data of number format, before being transformed into simulation from digital quantity, available digital integrated circuit filter is realized filtering so.
Figure 3 shows that a kind of suitable filter characteristic, rectangular element is represented independently pixel, and the numeric representation in its unit is used for the weighting of the filter of various adjacent image points, and it can be realized with software or digital filter at an easy rate.
To be untreated half of pixel brightness weighting of filter shown in Figure 3 is added in the center pixel, remaining half weighting is distributed in the sub-fraction as a kind of modulation, this part is positioned on each bar scan line of television video frequency signal upper and lower, in other words, single bright pixel will occur as half a pixel of high-high brightness, and as the line segment of two dispersions of low-light level.Because the fuzzy part of two dispersions is difficult for seeing, so what see on phosphor screen still is the pixel of a distinctness.Because the total brightness of this pixel that produces in these two fields is identical, and it covers in the filter zonule at interval, so be to see scintillation at field frequency rather than in frame frequency.Do not having in frame frequency, can to see scintillation under the situation of filtering, because pixel only shows in a field rather than in another,
The extreme case that note 1 expression black and white scan line among Fig. 1 replaces is not so owing to have the filtering scintillation serious.
Among Fig. 22 and 3, the brightness that has been created in shade balance around the letter between strange, the even-line interlace line because of filtering, thus reduced scintillation significantly, kept visual distinctness.
If the part of an images is to be made of the black and white horizontal scanning line that replaces, and in fact the black and white scan line is longer than some pixel, and will be reduced to uniform grey so in this zone is cost, can obtain stable image with typical filter.Except the scan line end, shown among Fig. 24.Shown even grey does not have scintillation.
To some character, lose some details, shown among Fig. 25.
In a kind of modified model, the center pixel weighting can slightly up increase and show details, but this is a cost there to be scintillation.
Elimination from to 1 expression from maximum scintillation for center pixel is to this process that is untreated, and represents a kind of compromise selection with a median.From the information viewpoint, in a zone that constitutes by the common black and white scan line that replaces, do not have cheering definition and occur.In order to use a kind of fixing filter, even it is also not serious to lose a little details, although can use various filters in some cases.
Claims (14)
1. the signal processing method implemented by software or hardware of a video signal processing apparatus, this video signal processing apparatus has the input and the output that receive detail image, this video signal processing apparatus can provide a kind of image that is suitable for interlaced video signal, it is characterized in that: this signal processing apparatus is added to after with the modulation of the figure signal of adjacent scanning lines on the current scan line and produces an output, described modulation then is before being added to current scan line, and the figure signal of adjacent scanning lines is carried out low-pass filtering.
2. signal processing method as claimed in claim 1 is characterized in that: this signal processing apparatus also comprises conversion equipment, and described conversion equipment produces television synchronizing pulse according to corresponding television standard.
3. signal processing method as claimed in claim 1 or 2, it is characterized in that: current field scan line and the filtered tight adjacent field scan line addition of the output signal of field scan line that is used for each bar vision signal by being lowered brightness with one produces, this signal processing device is equipped with a filter, comprise a low pass filter, therefrom derive the low frequency of an above-mentioned adjacent scanning lines and pay upright leaf component, what its was represented is brightness rather than details.
4. signal processing method as claimed in claim 1 or 2, it is characterized in that: will be added in a part of weighting of the pixel brightness that is untreated in the scan line in the described center pixel, and the weighting of remainder will be distributed to as a kind of modulation on some of a scan line and next bar scan line on the vision signal.
5. signal processing method as claimed in claim 4 is characterized in that: half of untreated pixel brightness weighting is added on the center pixel.
6. signal processing method as claimed in claim 4 is characterized in that: will be added on the center pixel above the pixel brightness weighting of being untreated of half.
7. signal processing method as claimed in claim 4 is characterized in that: the partial weighting that is added to the brightness of being untreated on the center pixel can be changed.
8. as claim 1,2,5,6 or 7 described signal processing methods is characterized in that: the vision signal that analog filter cheaply that is made of discrete component and linear integrated circuit can will produce in odd field and even field is carried out low-pass filtering and mixing.
9. as claim 1,2,5,6 or 7 described signal processing methods, wherein the pixel data of number format adopts video frequencies, it is characterized in that: carried out filtering with the digital filtering integrated circuit before digital-to-analogue conversion.
10. signal processing method as claimed in claim 3, wherein the pixel data of number format adopts video frequencies, it is characterized in that: carried out filtering with the digital filtering integrated circuit before digital-to-analogue conversion.
11. signal processing method as claimed in claim 4, wherein the pixel data of number format adopts video frequencies, it is characterized in that: carried out filtering with the digital filtering integrated circuit before digital-to-analogue conversion.
12. as claim 1,2,5,6 or 7 described signal processing methods, it is characterized in that signal filtering is to realize by software, obtain a stable and distinct image with a kind of video converter of routine, this transducer is directly realized composite signal conversion with red, green, blue signal.
13. signal processing method as claimed in claim 3, it is characterized in that signal filtering is to realize by software, video converter with a kind of routine obtains a stable and distinct image, and this transducer is directly realized the composite signal conversion with red, green, blue signal.
14. signal processing method as claimed in claim 4, it is characterized in that signal filtering is to realize by software, video converter with a kind of routine obtains a stable and distinct image, and this transducer is directly realized the composite signal conversion with red, green, blue signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB929223492A GB9223492D0 (en) | 1992-11-10 | 1992-11-10 | Processing of signals for interlaced display |
| GB9223492.1 | 1992-11-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1090694A CN1090694A (en) | 1994-08-10 |
| CN1053779C true CN1053779C (en) | 2000-06-21 |
Family
ID=10724800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93112935A Expired - Fee Related CN1053779C (en) | 1992-11-10 | 1993-11-10 | Signal processing for alternate-line scanning display |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0669035A1 (en) |
| JP (1) | JPH11503835A (en) |
| CN (1) | CN1053779C (en) |
| AU (1) | AU5428794A (en) |
| CA (1) | CA2148792A1 (en) |
| GB (1) | GB9223492D0 (en) |
| WO (1) | WO1994011854A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5510843A (en) * | 1994-09-30 | 1996-04-23 | Cirrus Logic, Inc. | Flicker reduction and size adjustment for video controller with interlaced video output |
| US5611041A (en) * | 1994-12-19 | 1997-03-11 | Cirrus Logic, Inc. | Memory bandwidth optimization |
| DE69629423T2 (en) * | 1995-06-30 | 2004-06-17 | Mitsubishi Denki K.K. | Flicker reduction device |
| US7535450B2 (en) | 2002-02-19 | 2009-05-19 | Thomson Licensing | Method and apparatus for sparkle reduction using a split lowpass filter arrangement |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492696A1 (en) * | 1990-12-21 | 1992-07-01 | Koninklijke Philips Electronics N.V. | Method and apparatus for the graphic reproduction of a symbol with an adjustable scale and position |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4843380A (en) * | 1987-07-13 | 1989-06-27 | Megatek Corporation | Anti-aliasing raster scan display system |
| US5005011A (en) * | 1988-12-23 | 1991-04-02 | Apple Computer, Inc. | Vertical filtering apparatus for raster scanned display |
| US5097257A (en) * | 1989-12-26 | 1992-03-17 | Apple Computer, Inc. | Apparatus for providing output filtering from a frame buffer storing both video and graphics signals |
-
1992
- 1992-11-10 GB GB929223492A patent/GB9223492D0/en active Pending
-
1993
- 1993-11-09 JP JP6511846A patent/JPH11503835A/en active Pending
- 1993-11-09 EP EP93924731A patent/EP0669035A1/en not_active Withdrawn
- 1993-11-09 CA CA 2148792 patent/CA2148792A1/en not_active Abandoned
- 1993-11-09 WO PCT/GB1993/002308 patent/WO1994011854A1/en not_active Application Discontinuation
- 1993-11-09 AU AU54287/94A patent/AU5428794A/en not_active Abandoned
- 1993-11-10 CN CN93112935A patent/CN1053779C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492696A1 (en) * | 1990-12-21 | 1992-07-01 | Koninklijke Philips Electronics N.V. | Method and apparatus for the graphic reproduction of a symbol with an adjustable scale and position |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9223492D0 (en) | 1992-12-23 |
| CN1090694A (en) | 1994-08-10 |
| EP0669035A1 (en) | 1995-08-30 |
| AU5428794A (en) | 1994-06-08 |
| JPH11503835A (en) | 1999-03-30 |
| CA2148792A1 (en) | 1994-05-26 |
| WO1994011854A1 (en) | 1994-05-26 |
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