CN100496089C - Method and apparatus for image geometrical distortion compensation of TV set - Google Patents
Method and apparatus for image geometrical distortion compensation of TV set Download PDFInfo
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- CN100496089C CN100496089C CNB2004100774278A CN200410077427A CN100496089C CN 100496089 C CN100496089 C CN 100496089C CN B2004100774278 A CNB2004100774278 A CN B2004100774278A CN 200410077427 A CN200410077427 A CN 200410077427A CN 100496089 C CN100496089 C CN 100496089C
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Abstract
This invention relates to a geometrical distortion compensation method and a device for CRT TV images, in which, the change of brightness of the displayed image content of a TV will result in related changes to the EHT voltage and the electronic beam current of the kinescope, then a digital processor generates digital correct data to control the digital video signal processor to re-organize the fetch and output relation of the video signals to alter the output display time of the pixels on the screen to compensate the image geometrical distortion, thus, the image diameter is not changed and the image is not distorted even if the scan grid width is changed when the brightness is changed.
Description
Technical field
The present invention relates to a kind of method and device that TV images is revised and compensated, say so exactly and realize the CRT TV images when brightness changes, the method and apparatus of the compensation correction that the image geometry size is exerted an influence.
Background technology
The picture traverse of television set can change because of the brightness of image and change.Image brightness uprises, and it is big that its width becomes simultaneously.The production process of this phenomenon is: image brightness rising → beam current of kinescope rising → EHT voltage decline → electron beam deflecting sensitivity rising → raster and picture size become big.Otherwise then picture size diminishes.Several solutions of present existence are:
1, stablize EHT voltage: add on EHT voltage and put a kind of pressurizer, when making beam current varies, EHT voltage remains unchanged, and it is constant that picture traverse is stablized.
2, install width modulator additional in horizontal output stage, the electric current of line deflector coil is changed with EHT voltage (or beam electronic current), compensate, make picture traverse constant with variation to deflection sensitivity.Field width of cloth compensation principle is with top described identical.
3, for improving the figure image curvature of image local brightness due to inequality, generally also adopt the image dynamic compensation, promptly increase capacitor, when image local brightness changes, can make EHT voltage not produce fluctuation at EHT voltage place.
Three kinds of above methods all are that to adopt analogue technique to keep raster size constant, and its treatment circuit complexity, cost are higher, and reliability is lower, all adopts on the television set at present seldom.
Summary of the invention
The method and apparatus that the purpose of this invention is to provide a kind of CRT image geometrical distortion compensation of TV set, this method and apparatus can make the image of CRT television set, when brightness changes, even variation has taken place the raster width, but still can keep the constant and image of picture size size not produce twisted phenomena.
The present invention is achieved in that
A kind of method of image geometrical distortion compensation of TV set is characterized in that: this method comprises the steps:
Detect step, EHT beam electronic current detector detects beam current varies,
Revise step: digital processing unit calculates the correction data of needs according to the variable quantity of beam electronic current,
Aligning step: digital processor controls video signal preprocessor, correction data to its incoming video signal, the output of correcting video signal, vision signal behind next stage circuit output calibration, when image brightness changes caused raster image when producing geometric distortion, make the output time of each pixel of vision signal do suitable change, under the situation of grating distortion, keep the relative position of each pixel constant with compensation, to obtain distortionless image.
The method of described image geometrical distortion compensation of TV set, the method for its aligning step are that the image geometry size is remained unchanged, comprise image about the row width of cloth, go up the end width of cloth, etc. the compensation correction of geometric distortion of aspect.The present invention changes caused raster image when producing geometric distortion when image brightness, only compensate correction to showing view as content, and the electronic scanning grating is not revised.
The method of described image geometrical distortion compensation of TV set, its aligning step are to change each image pixel to show the time in the output of display screen, make image geometric distortion be able to compensation correction.
Above-mentioned compensation process when image brightness changes caused raster image when producing geometric distortion, changes the reading of each pixel of image video signal, output time, and it adjusts the size decision of the size of time by the brightness variable quantity of image.Brightness changes high more, and the adjustment time is big more; Otherwise it is then more little.
Described detection step, the sampled signal of its EHT beam electronic current detector is for EHT voltage or picture tube beam electric current or other can reflect the variable signal of image brightness situation of change.
Compensation correction to image comprises that the static compensation of image is proofreaied and correct and dynamic compensation is proofreaied and correct.It mainly is that video signal preprocessor is revised according to these correction data, and exports to the picture tube control circuit to the fixing correction data of video signal preprocessor output that static compensation is proofreaied and correct; Dynamic compensation is proofreaied and correct the signal that is meant real-time detection beam circuit, calculates at its real-time variable quantity and revises data, and export this correction data to audio signal processor in real time, in time revises.
A kind of image geometrical distortion compensation of TV set device is characterized in that described compensation arrangement comprises: EHT beam electronic current detector, digital processing unit (perhaps CPU), A/D converter, processing/image zoom circuit, D/A converter line by line; Annexation between them is: EHT beam electronic current detector connects the line output kickback transformer and detects, the beam current varies amount that detection obtains is input to digital processing unit after the A/D converter conversion, digital processing unit calculates according to the image brightness variable quantity and revises data, will revise data and be input to processing/image zoom circuit line by line; In the vision signal treatment channel, analog video signal by the output of picture decoding treatment circuit is changed through A/D converter, be input to line by line processing/image zoom circuit and accept the adjustment of data, form the vision signal of layout again after the correction, this vision signal is reduced into the laggard line output of analog video signal through the D/A converter conversion; So mainly be to adopt EHT beam electronic current detector to detect the situation that the picture tube beam electric current changes, digital processing unit (CPU) writes down this situation of change, and revise data to the output of processing/image zoom circuit line by line, finish the correction of layout again by processings/image zoom circuit line by line to each pixel of vision signal.
The basic principle of its whole process is: when the brightness of television set display image content changes, can cause EHT voltage and picture tube beam electric current that corresponding the variation taken place, detect its corresponding variable quantity by an EHT beam electronic current detector, produce numeral to revise data by digital processing unit again, remove the control figure video signal preprocessor, reorganize the reading of vision signal, output relation, change each image pixel and show the time, make image geometric distortion be able to compensation correction in the output of display screen.
Described EHT beam electronic current detector, when its detection signal is beam current of kinescope, described detector is made up of a resistor network, the test point that it is characterized in that taking a sample is the negative pole of line output kickback transformer anode high voltage winding, behind a resistance amplitude limit, the intermediate contact of the voltage offset electric circuit of forming with a positive supply upper offset resistance and earth resistance links to each other, at this junction output detection signal.
Described EHT beam electronic current detector, when it is connected in the anode high voltage of picture tube horizontal equilibrium flyback transformer, described detector is made up of a resistor network, the test point that it is characterized in that taking a sample is the first anode voltage (EHT voltage) of picture tube, behind high-tension resistive sampling, amplitude limit, the intermediate contact of the voltage offset electric circuit of forming with a positive supply upper offset resistance and earth resistance links to each other, at this junction output detection signal.
Digital processing unit, A/D converter, image processing circuit and D/A converter that described compensating circuit is included, can be by relevant digital processing circuit institute conversion such as the variable-frequency scanning circuit that uses on the present television set, picture memory circuit, D/A, quote, can continue to use prior art in other words and realize.
When the present invention changes when image brightness, with brightness variable quantity signal conveys to digital microprocessor, calculate the also output of correcting video signal, make the output time of each pixel of vision signal do suitable change, under the situation of grating distortion, keep the relative position of each pixel of image constant with compensation, to obtain distortionless image.Guaranteed that the television image size of images is not subjected to the interference of brightness, when brightness changes,, but still can keep the constant and image of picture size size not produce twisted phenomena even variation has taken place the raster width.
Description of drawings
Fig. 1 is a structural representation of the present invention,
Fig. 2 change for brightness of the present invention and proofread and correct after picture view,
Correction picture view of the present invention when Fig. 3 changes for the picture traverse of TV set image brightness upper zone,
Fig. 4 is the circuit diagram of EHT beam electronic current detector of the present invention.
Embodiment
Shown in Figure 1, specific embodiments of the invention include: 1. EHT beam electronic current detector, 2. A/D converter, 3. digital processing unit, 4. processing/image zoom circuit, 5. D/A converter line by line.It is realized the process of image geometrical distortion compensation:
When the brightness of television set display image changes, by 1. the be expert at anode high voltage winding of output flyback transformer of EHT beam electronic current detector, detect the beam current varies amount that the reflection image brightness changes, 2. be delivered to digital processing unit 3. through A/D converter after, by digital processing unit the beam current varies amount is carried out calculation process, data are revised in output, deliver to line by line processing/image zoom circuit 4..In the vision signal treatment channel, analog video signal by the output of picture decoding processing integrated circuit, through A/D converter, convert to analog video signal behind the digital video signal and 4. the correction data of the reflected image brightness situation of change that 3. digital processing unit is exported deliver to line by line processing/image zoom circuit together, reorganize the reading of each pixel of vision signal, output time, 5. vision signal through layout again enters the D/A conversion processor, exports after the digital video signal of handling is reduced into analog video signal.
But the image fault that apparatus of the present invention compensation correction causes when changing because of TV images brightness, as shown in Figure 2.
Among Fig. 2, above frame be presentation video brightness picture horizontal width hour, middle frame is the picture horizontal width (broaden) of presentation video brightness when big, following frame is the picture width after expression is proofreaied and correct, a ' b ' is the picture traverse (hour width is identical with image brightness) after image brightness is proofreaied and correct through apparatus of the present invention when big, and ab is the raster width of image brightness when big.
When image brightness hour, picture has normal width, when brightness was big, the horizontal width of picture broadened, the circle among the figure deforms, after overcorrect, contrast ab and a ' b ', the picture width after obviously proofreading and correct recovers normal.
Shown in Figure 3, when television set shows the image of different brightness parts in the same picture, because EHT voltage changes the picture traverse of brightness upper zone with the brightness variation and the change to some extent of picture material.The influence of the distributed capacitance that forms because of the inside and outside graphite linings of picture tube makes EHT voltage and picture traverse change and tends towards stability.
A is the picture that image has only two vertical line informal vouchers among Fig. 3.B is the image fault distortion picture due to when increasing the white piece image of a rectangle in the middle of the screen.C compensates revised image frame (image correction, grating is constant) through apparatus of the present invention to distorted image.
When image brightness changes, with brightness variable quantity signal conveys to digital microprocessor, make the output time of each pixel of vision signal do suitable change, under the situation of grating distortion, keep the relative position of each pixel of image constant with compensation, to obtain distortionless image.
Under the television set normal condition, when the brightness of display image content changes, cause that corresponding the variation taken place for picture tube beam electric current and EHT voltage, make raster and size of images that variation all take place, detect the associated change amount by EHT beam electronic current detector, when CPU (data processor) detected relevant variable quantity, control SCALER picture size changed.Control procedure is as follows: when image brightness becomes big, EHT voltage descends, it is big that raster and picture size become, when CPU detects EHT beam electronic current detector output reduction, according to the influence of current value to the image size, former output image size is suitably reduced, the image size as required and the proportionate relationship of input resolution, can calculate the scaling factor, by in the relevant register of scaler, scale factor and other zooming parameters (carrying out the starting and ending position of convergent-divergent etc. as image) being set,, can carry out convergent-divergent again by the scaler inter-process, picture size is diminished, and vice versa.Can not revise raster, also reach the effect that the picture size size remains unchanged.
One of main composition of the present invention is an EHT beam electronic current detector, and EHT beam electronic current detector detects the situation that the picture tube beam electric current changes, this situation of change of digital processing unit (CPU) recording processing.Figure 4 shows that the circuit diagram of EHT beam electronic current detector.
Frame of broken lines interior (indicating FBT) is the anode high voltage winding and the output diode of line output kickback transformer among the figure; EHT beam electronic current detector shifts to an earlier date signal from this and detects, and detects sampled signal.
R1 regulates the size of detection signal output amplitude; R2, R3 can adjust the direct voltage of output signal.
When its detection signal is beam current of kinescope, the sampling test point of above-mentioned detector is the negative pole of line output kickback transformer anode high voltage winding, behind a resistance amplitude limit, the intermediate contact of the voltage offset electric circuit of forming with a positive supply upper offset resistance and earth resistance links to each other, at this junction output detection signal.
When its detection signal is the anode high voltage of picture tube, the sampling test point of above-mentioned detector is the first anode voltage (EHT voltage) of picture tube, behind high-tension resistive sampling, amplitude limit, the intermediate contact of the voltage offset electric circuit of forming with a positive supply upper offset resistance and earth resistance links to each other, at this junction output detection signal.
Claims (4)
- The method of 1 one kinds of image geometrical distortion compensation of TV set is characterized in that: this method comprises the steps:Detect step, EHT beam electronic current detector detects the sampled signal of video signal preprocessor, detects beam current varies,Revise step: digital processing unit calculates the correction data of needs according to the variable quantity of beam electronic current,Aligning step: digital processor controls video signal preprocessor, correction data to its incoming video signal beam electronic current, the output of correcting video signal, vision signal behind next stage circuit output calibration, when image brightness changes caused raster image when producing geometric distortion, make the output time of each pixel of vision signal do suitable change, under the situation of grating distortion, keep the relative position of each pixel constant with compensation, to obtain distortionless image.The method of 2 image geometrical distortion compensation of TV set as claimed in claim 1, it is characterized in that its aligning step is to change each image pixel to show the time in the output of display screen, under the situation of grating distortion, keep the relative position of each pixel of image constant, to obtain distortionless image, promptly change caused raster image when producing geometric distortion when image brightness, change the reading of each pixel of image video signal, output time, it adjusts the size decision of the size of time by the brightness variable quantity of image, brightness changes high more, and the adjustment time is big more; Otherwise it is then more little.The method of 3 image geometrical distortion compensation of TV set as claimed in claim 1, it is characterized in that described detection step, the sampled signal of its EHT beam electronic current detector is for EHT voltage or picture tube beam electric current or other can reflect the variable signal of image brightness situation of change.
- 4 one kinds of image geometrical distortion compensation of TV set devices is characterized in that described compensation arrangement comprises: EHT beam electronic current detector, digital processing unit, A/D converter, processing/image zoom circuit, D/A converter line by line; Annexation between them is: EHT beam electronic current detector connects the line output kickback transformer and detects, the variable quantity of the beam electronic current that detection obtains is input to after A/D converter is converted to the digital signal of variation, digital processing unit carries out calculation process according to the beam current varies amount, and revise data to the output of processing/image zoom circuit line by line, bus line control removes control processing/image zoom circuit line by line; In the vision signal treatment channel, analog video signal by the output of picture decoding treatment circuit enters processing/image zoom circuit line by line after A/D converter converts digital video signal to, accepting bus data proofreaies and correct, form the vision signal of layout again after the correction, this vision signal is reduced into the laggard line output of analog video signal through the D/A converter conversion.
- 5 image geometrical distortion compensation of TV set devices as claimed in claim 4, it is characterized in that described EHT beam electronic current detector, when its detection signal is beam current of kinescope, described detector is made up of a resistor network, the sampling test point is the negative pole of line output kickback transformer anode high voltage winding, behind a resistance amplitude limit, the intermediate contact of the voltage offset electric circuit of forming with a positive supply upper offset resistance and earth resistance links to each other, at this junction output detection signal.
- 6 image geometrical distortion compensation of TV set devices as claimed in claim 4, it is characterized in that described EHT beam electronic current detector, when it is connected in the anode high voltage of picture tube horizontal equilibrium flyback transformer, described detector is made up of a resistor network, the sampling test point is the first anode voltage of picture tube, behind high-tension resistive sampling, amplitude limit, the intermediate contact of the voltage offset electric circuit of forming with positive supply upper offset resistance and earth resistance links to each other, at this junction output detection signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100774278A CN100496089C (en) | 2004-12-09 | 2004-12-09 | Method and apparatus for image geometrical distortion compensation of TV set |
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| CNB2004100774278A CN100496089C (en) | 2004-12-09 | 2004-12-09 | Method and apparatus for image geometrical distortion compensation of TV set |
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| CN100496089C true CN100496089C (en) | 2009-06-03 |
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| CN101123673B (en) * | 2006-08-07 | 2011-03-30 | 康佳集团股份有限公司 | A system and method for debugging scanning distortion of TV set |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5021885A (en) * | 1989-07-07 | 1991-06-04 | Samsung Electronics Co., Ltd. | Automatic brightness limiter |
| CN1118125A (en) * | 1994-08-29 | 1996-03-06 | 松下电器产业株式会社 | ABL control circuit, ACL control circuit, luminance/color difference signal processor and video display apparatus |
| GB2325601A (en) * | 1997-05-23 | 1998-11-25 | Daewoo Electronics Co Ltd | Horizontal width regulation circuit for a CRT display |
| CN1377192A (en) * | 2002-04-10 | 2002-10-30 | Tcl王牌电子(深圳)有限公司 | Method and device for detecting beam current of kinescope and its application |
-
2004
- 2004-12-09 CN CNB2004100774278A patent/CN100496089C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5021885A (en) * | 1989-07-07 | 1991-06-04 | Samsung Electronics Co., Ltd. | Automatic brightness limiter |
| CN1118125A (en) * | 1994-08-29 | 1996-03-06 | 松下电器产业株式会社 | ABL control circuit, ACL control circuit, luminance/color difference signal processor and video display apparatus |
| GB2325601A (en) * | 1997-05-23 | 1998-11-25 | Daewoo Electronics Co Ltd | Horizontal width regulation circuit for a CRT display |
| CN1377192A (en) * | 2002-04-10 | 2002-10-30 | Tcl王牌电子(深圳)有限公司 | Method and device for detecting beam current of kinescope and its application |
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