CN1096181C - Video display control system - Google Patents

Abstract

The present invention relates to an image display control system. The present invention automatically responds and controls the image display of detected input image signals in a caption region format with different display format ratios. A detection circuit continuously detects and stores the first and the last rows of an effective image in image signals in a memorizer. The height of a picture plane is decided by the scan line numbers of the first and the last rows of the effective image, and indicates the display format ratio of the caption region format. The threshold value relevant to the maximum display ratio of the input signals in a prospective caption region is compared with the height of the picture plane by a comparison circuit.

Description

Video display control system

The controller that the present invention relates to have the vision area of special display format ratio or the ratio of width to height and include the efficient image zone of measured signal, thus effective image region shown adaptively, so that make full use of the television receiver of vertical vision area.Picture can be by vertical and zoom flatly.Yet, the horizontal size of zoom picture and fail with the consistent situation of the horizontal size of panel under, the level of picture resembles the demonstration that the width of cloth is just wanted limited or had vertical edge strip.The present invention responds to the variation of the form ratio of active images adaptively, with the ratio and picked-up panorama (pan) of regulating compression or expansion (zoom) selectively, so that the efficient image zone of received signal takes whole vision area, or take vision area in vertical direction.This selection can be decided by televiewer's hobby, or programming in advance.But in a kind of selection scheme, the televiewer sees that the picture that takes full screen is a cost to clip the partial information content.In another kind of alternative plan, spectators see that the picture with complete information content is to see that not utilizing full frame less picture is cost.

The viewing area of television receiver typically or be 4 unit widths to the display format of 3 unit height than (being called " 4 * 3 " or " 4: 3 "), perhaps tradition is thought 16 * 9 (16: 9) the form ratio for " widescreen " or film form ratio.These two kinds of ratios are standard comparatively speaking, although also have other known format ratios.Receiver with particular display format ratio is subjected to the restriction of these aspects, that is, make with different-format can be shown than the signal that provides.Similarly, in the occasion that will show multiple picture intelligence, may there be some constraint for the given operational form ratio of wherein a kind of signal.

Commerciality broadcasting great majority often be 4 * 3 display formats than (higher relatively and/or narrower), whole viewing areas of 4 * 3 traditional like this receivers are just in time taken by whole image.Thereby most of tv products have 4 * 3 ratios on the market, and it also is known that widescreen shows, for example is intended for use to watch wide-screen film.Available movie program on the market with the production of the ratio of width to height of having nothing in common with each other, and how much 16 * 9 be an individual standard than (shorter relatively and/or wideer) for the widescreen format of TV.

Many spectators find, 4 * 3 display formats, and its effect is not as the display format ratio of film.No matter and where television set may be placed on, give a kind of sensation of people than wide format, and narrower form makes spectators feel to watch the sensation of TV at home just as watching at the cinema.Wide display format utilizes its Zone Full to show complete film than signal, need not for example to pass through telecine equipment, and the processor in the television set etc. removes the intercepting or the former mute that distorts.

In order to show 4 * 3 signals on 16 * 9 display units, or showing 16 * 9 signals on 4 * 3 display units, is not sharp have more than is needed whole display unit zone, has castrated video information exactly.The picture that is received can be taken panel, and will remove partial picture from signal on other direction in one direction by zoom.For example, the top of 4 * 3 signals and bottom can be by amputation, and remainder takes 16 * 9 form viewing areas, lateral section that perhaps can amputation 16 * 9 signals, and remainder takes 4 * 3 zones.What in general, people were concerned about is that width is to the ratio of height rather than any demand that signal is amplified or compresses.

Do not remove amputation signal simply, but by automatically, perhaps under television film scanner operator control, picture moved up and down, or from a sidesway to opposite side, in order to avoid lose important information in the picture, this is known.The also known signal that is shown of castrating of people for example compresses 16 * 9 signals in the horizontal direction, thereby shows on 4 * 3 display units, when in commercial broadcasting (4 * 3), showing the credit of wide screen (16 * 9) film, regular meeting see like that.Intercepting, moving image and distortion all can be left out content and/or the quality of picture is had harmful effect.

When will not doing on the display unit of different-format ratio under the situation of amputation or distortion, when showing a kind of effective video signal of form ratio, shown signal just occupies discontented whole operational screen areas.The zone that is not used on the display unit is blanking zone or makes the colored delustering of its display background.Yet this rim area can be utilized, and for example side by side shows another picture with key frame, perhaps videotex information.

In so-called " subtitle region " (" letterbox ") form, wide format shows on the full duration of narrow form than display unit than image, and the supposition of top and/or bottom section is used as and shows for example storm warning, texts such as news alert.This function can be chosen at random by spectators.The film of wide format will carry out undistorted or not have the commercial broadcasting of amputation, can it be transformed to the subtitle region form by the broadcasting station, thereby it can be shown on 4 * 3 television screens of routine.In fact the broadcasting station has added blanking or dim top and bottom frame, and forms picture and the frame of broadcasting combination with 4 * 3 composite picture signals.Suppose 16 * 9 and 4 * 3 ratios of standard, have only 181 horizontal line to be used to show main picture in every, remaining row is dim grey or dark border so.These frames can be seen as and be similar to a picture from second eikongen that shows simultaneously with key frame.

Adjusting form ratio especially may be a complicated problems in the time will showing a plurality of efficient images source simultaneously.For example may produce consistent timing signal according to the asynchronous source that shows simultaneously, thereby switch between multiple source in scan period, produce the compressed demonstration that a plurality of pictures show and/or provide from high-resolution pictorial data signal low resolution.

From PCT application WO9119390, can recognize that automatically the signal under the sensing subtitle region form amplifies the subtitle region image subsequently and compares screen to fill up wide format.This prior art file discloses a kind of automatic caption district detector, but it does not build the device of first and last row of any continuous detecting effective video.

Documents JP03-262389 discloses a kind of control circuit, with according to vision signal and display screen amplification video signal selectively.But it but detects the device of the capable and last row of first in the effective video continuously less than suggestion.

One aspect of the present invention is a device of automatically regulating the displayed image source signal, thereby is received in any display format ratio in the preset range adaptively, and the live part of eikongen signal is expanded and centering by vertical direction, so that it takes display screen.

Another aspect of the present invention is first row and the last row that repeatedly detects efficient image in the eikongen signal, and calculate zoom degree (zoom lovel) and make image prevailing for the time being in force take the pickup location of viewing area, thereby the variation of the ratio of width to height is responded adaptively.

Aspect in addition of the present invention is the adjusting that realizes in the following manner vision signal,, is not subjected to the false capable reading and the influence of blanking or the useless screen of other modes that is.

According to a kind of structure of the present invention, input signal is by user's selection or through programming, no matter which kind of efficient image display format to be utilized all display formats in available vertical screen districts than changing into from continuously with adaptively.Even the display format ratio changes during watching, the for example appearance of frame captions or disappearance later in the subtitle region format signal, otherwise perhaps input signal from the subtitle region form become conventional form or, television set recomputates regularly and display parameters according to the present invention, field adjusted in succession reaches the optimum utilization of available viewing area.The present invention provides high-resolution single and a plurality of picture to show that its display format ratio is selectable simultaneously from the single or multiple unsynchronized sources with similar or different form ratios, and everything all carries out based on continuous and self adaptation.

Can have for example 16 * 9 display format ratio as wide screen television described herein.The invention provides with the possibility of bigger flexibility demonstration with subtitle region form received signal.Originally with 16 * 9 the ratio of width to height produce but changed into subtitle region image (for example 4 * 3 images), and around this efficient image be that the top of blanking and the signal of bottom frame can be exaggerated or expand, make efficient image take panel, and keep its original the ratio of width to height.

The ratio of width to height of efficient image take screen greater than the source vertical direction of the ratio of display screen (for example, 20: 9 sources were to 16: 9 screens) and horizontal direction by amputation.The ratio of width to height is less than the source of the ratio of width to height of screen, its horizontal direction take screen and vertical direction by amputation.These parts that are used for dim frame in 4 * 3 broadcast singals are by amputation automatically.When being changed, situation proofreaies and correct the scope that recomputates zoom and move adaptively.

According to a kind of structure of invention, visual display control program resembles demonstration to the detection of subtitle region form input image signal with the different display format ratio automated control chart that responds.Testing circuit detects first row and the last row of efficient image in the picture intelligence continuously.First row of memory storage and efficient image and the corresponding scan line of last row number.Number can determine the height of picture from the scan line of first row of efficient image and last row.Height is expressed the display format ratio of subtitle region input.One comparison circuit is with height and threshold corresponding to the wideest display format ratio of the expectation of subtitle region input signal.For example, for the control circuit of microprocessor is operable in first operator scheme promptly except that height surpasses threshold value, start memory and refresh the scan line stored continuously and number also be operable in second operator scheme, promptly when the capable pairing scan line of the image that detects efficient image number less than first row of being stored or greater than stored last capable the time can start scan line that memory refress stores number.Corresponding at least a picture dimension and the picture capturing on the height control display unit.After second operator scheme, the circuit that starts first operator scheme can be operated automatically or manually.This system can be adaptively can be for showing input image signal on the viewing area or in the mode of maximum vertical height in maximum, no matter and be used for specific the ratio of width to height of subtitle region, no matter also the occupied frame scope of literal and so on is how.

Include the image diplay of first display format ratio according to the visual display control program of another kind of invention structure.One height circuit is measured the active area height from the input image signal with second kind of display format ratio.One testing circuit is according to efficient image height identification caption district form in the vision signal, and the explicit form ratio of mensuration subtitle region picture.One amplification control circuit is operable in first operator scheme, picture dimension is amplified until taking entire display screen substantially, although and can cause the picture amputation, also be operable in second operator scheme, picture dimension is amplified to basically takes display screen, although can cause the part display screen not to be used in vertical direction.In two kinds of operator schemes, the vertical moving control circuit is automatically with picture centering.Detector can identification caption district format picture the display format ratio.To the variation of the display format discerned than the circuit image aspect of picture that control is amplified of making response.Deflection system is expanded and compression controllable levels size by change level image by changing field scanning rate may command vertical dimension, and by changing vertical reset control panning position on the phase place.

The subtitle region picture intelligence can be thought and is made up of three zones that (supposing that efficient image is positioned at vertical centre position, is not to be positioned at top or bottommost.Three zones that are designated as A, B and C are such: A district and C district do not have efficient image, or dim chromatic image brightness is less than the predetermined threshold value of brightness or Dimmable.These frames are corresponding to dark relatively or indistinctive.There is efficient image in the B district, or image brightness and typically has significant change corresponding to the picture between two filaments of sun greater than the predetermined brightness threshold value at least.The time interval separately in A district, B district and C district is the function of employed specific subtitle region form, and employed subtitle region form can be from 5 * 3 to 24 * 9 a scope for example, and commonly used 16 * 9 than just in this scope.

For 16 * 9 subtitle region forms, the horizontal line time interval in A district and C district all is approximately 20 row.Letterbox detector detects the brightness while count level line number in A district and/or C district.If in the A district and/or the C district detect efficient image; or at least one minimum image brightness; then letterbox detector sends output signal; store present horizontal scan line counting; in order to recomputate the conversion ratio; make the first trip of efficient image and footline be in the predetermined point on the display screen, usually or be positioned at highs and lows, perhaps be positioned at screen is gone up on the height separately that whole horizontal widths are taken by image.Preferably the user can choose at random the mode that this device influence shows, can select the demonstration of dark border when the user is wanted, perhaps amputation, compression, expansion or above-mentioned several combination.

Balancedly respond by variation and to improve the operation of detector the ratio of width to height of received signal.In case the signal that shows has been established specific the ratio of width to height signal, and after this detected efficient image (for example, the captions that show) outside the viewing area in the subtitle region frame of input signal, this is presented at the some continuous frames of experience and is converted to new ratio.Best, this variation makes that by reaching changing incrementally or balancedly to respond on the displaying ratio picture has been done suitable expansion or compression at the some frames in succession of experience.This incremental variations amount can be with relevant for reaching the correcting range that new the ratio of width to height requires.In order to reduce tangible shake etc., before proofreading and correct, can determine the minimum row count threshold.

Preferably, every row in the image field detects the highest and minimum effective image area by being calculated two gradients.Need following four values in order to calculate these two gradients; The minimum and maximum value of existing row, the minimum and maximum value that moves ahead earlier.First gradient of being appointed as positive gradient produces by deduct the minimum value that moves ahead earlier by the maximum from existing row.Second gradient of being appointed as negative gradient is the minimum value generation that deducts existing row by the before maximum that moves ahead.In two gradients any can be on the occasion of or negative value, this depends on scene content, but the negative value in two gradients can be ignored.This is because only having a gradient quarter at a time is negative value, and the size of positive gradient has been simplified circuit always more than or equal to the value size of this gradient owing to the absolute value that there is no need compute gradient is former.If arbitrary gradient have above programmable threshold on the occasion of, think that image is present in or existing row or move ahead earlier.These values can be used by microprocessor, so that whether eikongen and decision row separately number are arranged in the decision subtitle region form.Just can only carry out this calculating as long as be provided with the device of visual vertical centering to the top (or bottom) of image.The detection of efficient image is the function of gradient in fact, rather than the function of brightness absolute value, so this device can detect predetermined dark-coloured useless frame, although frame still has suitable (constant) brightness.

Similarly, the effective image area of horizontal direction both sides can be by to deciding at the beginning of in succession horizontal line or end's adjacent image point or group of pixels compute gradient.And, if then only need calculating a side, picture centering gets final product.

Fig. 1 (a)-1 (f) shows the different display format of wide screen television, and Fig. 1 (d) shows the more employed terms of this paper.

Fig. 2 is the 2f that is adapted to operate in according to aspects of the present invention _HThe calcspar of the panavision under the horizontal sweep.

Fig. 3 is the calcspar of implementing according to the used gate array of TV of Fig. 2; The figure shows main and auxiliary signalling channel and output signal channel.

Fig. 4 is the combination to the calcspar and the circuit diagram of deflection circuit shown in Fig. 2.

Fig. 5 and 6 is the charts that are used to illustrate automatic caption district sensors work.

Fig. 7 is the calcspar of the automatic caption district detector explained together in conjunction with Fig. 5 and Fig. 6.

Fig. 8 is an alternative circuit block diagram realizing automatic caption district detector.

Fig. 9 is the calcspar that comprises the vertical dimension control circuit of automatic caption district detector.

Figure 10 is used to explain the flow chart of realizing self adaptation subtitle region display mode according to a kind of invention structure.

Figure 11 (a) is a chart, and Figure 11 (b) is a flow chart, and one is used from explanation realizes the mode that the self adaptation subtitle region shows again after interrupting.

Four pictures of Fig. 1 illustrate the display format of one group of sprite can realizing according to different invention structures.16 * 9 and 4 * 3 two kinds of basic formats show with overlapping each other, as an example of the verb-overlapping pattern with different the ratio of width to height.According to the present invention, overlapped form need not to be limited in any specific size, because detect efficient image the ratio of width to height according to plant automation of the present invention, utilizes display size best.

Fig. 1 (a) but displayed image on it is described have broad (for example 16 * 9) display format ratio, for example a TV of direct-viewing type or projection.When 4 * 3 pictures were sent out and show, shown in Fig. 1 (b), invalid area of image was shown as and is positioned at vertical black, the grey filaments of sun that both lateral sides occurs.Similarly, shown in Fig. 1 (c), when showing 16 * 9 pictures on 4 * 3 form display screens, invalid area of image appears as the horizontal bar that is positioned at top and bottom.This structure shown in Fig. 1 (c) can be coded in the picture intelligence from a source, so this signal is commonly called with the subtitle region form.In this case, because neither amputation does not show whole horizontal line information to compressed image information yet, the picture of being seen is in vertical direction less than available viewing area.If 16 * 9 display formats were converted before sending than the source, therefore it can take the vertical range of the vision area of 4 * 3 display formats, can know from Fig. 1 (b) and to see, perhaps with the information amputation on left side and/or right side, perhaps can select compressed information, the picture that is caused so can amplify (being equivalent to level compression relatively) owing to opposing vertical obvious distortion.Another alternative plan is, yet removable shown signal location, yet all these possibilities or leave out or changed these looks of signal do not have a kind of scheme attractive especially.

Automatic caption of the present invention district detection system is subtitle region source with variable the ratio of width to height of extends perpendicular and centering automatically, to take TV screen in vertical direction when keeping original the ratio of width to height.Have source greater than 16: 9 the ratio of width to height in the horizontal direction by amputation, and the source that has less than 16: 9 the ratio of width to height shows with the viewable side strips.By changing field scanning rate control VZW; By changing the horizontal zoom of horizontal extension/compression control; With regulate vertical moving by the phase place that changes vertical-reset pulse.After initial zoom, if the zone in not display frame detects efficient image, this system recomputates and refreshes these parameters, comes the row number of self-detection circuit will be through screening, eliminating false reading, and blanking or invalid (invalid) screen ignore.

Consult Fig. 1 (d), first capable number (first of the detected efficient image row on existing) obtains from the register of subtitle region testing circuit, and capable at last number like this too.Similarly, obtain visual initial row (at the row between last subtitle region and the effective image area number) and visual termination row (delimit captions regional boundary limit) down.Height can be tried to achieve by the difference of termination row number and initial row number, and center row number is then tried to achieve by this two row mean value.The screen center is exactly the row number that is positioned at screen central authorities, and be preferably in center row to be shown number locational that.

Be to eliminate mistake, the pairing minimum constructive height threshold of maximum the ratio of width to height (being typically 24: 9) that height will can run into expection.When exceeding this threshold value, just suppose that existing picture is that row blanking or existing number is invalid, unit needs regulate according to these values.

For eliminating shake, the current value and the difference between the preceding value of frame parameter will be compared with change threshold.When difference during less than threshold value, caused variation does not guarantee to refresh these parameters.When request refreshed the value of first row number of efficient image and last row number, the letterbox detector register was sampled.The generation of this situation is no more than every frame once for multiframe.Its result will for example pass through the secondary medial filter through filtering, is used to determine the boundary between efficient image and subtitle region.

When the subtitle region eikongen shows, and wish that efficient image takes when full frame in vertical direction, starts this system by the user.Once startup, from first row of existing picture number and last row number calculate height and picture central authorities.If height is less than the minimum constructive height threshold value, system refreshes height continuously, until surpassing threshold value.This just makes system not remove to comprehend blanking picture and wrong first row number and last row number.

The relatively expression practical function of the present invention of Fig. 1 (C) and 1 (f).Effectively the subtitle region source signal has been exaggerated desired amount in Fig. 1 (c), to take the wide format display screen.In illustrated embodiment, to such stage, that is, just in time cooperate the size of widescreen viewing area on ratio at the zoom (they equate, with the ratio of width to height of the picture intelligence of remaining valid) of level and vertical both direction.Also might receive the efficient image signal of the ratio of width to height, in this case, take vertical area the edge of level image is clipped greater than viewing area the ratio of width to height.

If efficient image occurs, for example report to the police number just variation of the last row of efficient image at the storm shown in Fig. 1 (f) in subtitle region.Therefore, the system refresh central row number and the scope of amplifying make the capable bottom that appears at the viewing area of new final image.This operation is different from simply and is converted to another kind from a kind of form ratio, because shown in Fig. 1 (f), amplifies and to choose be to carry out adaptively in the position, and takes display screen on request to adapt to the situation of variation.The effect of the additional effective image area that is provided by captions is the ratio of width to height that changes efficient image like this, makes the ratio of efficient image the ratio of width to height less than display screen.Therefore, the complete signal of vertical direction is shown, and has side slat.

Can line by line scan by the method that line number doubles or line number increases than subtitle region picture with 16 * 9 display formats that 4 * 3 display formats are more contained than signal, thereby the bigger display frame with enough vertical resolutions is provided.According to the present invention, wide screen television can show that this 16 * 9 display formats from a main source, one or more auxiliary source or an outside RGB source compare signal.

Also can utilize invalid area of image on the display screen in every way.For example, the dead space is sometimes as the Word message such as weather of broadcasting with the subtitle region form and news report.The dead space can have an additional overlapping pictures, for example as another channel program of having a look earlier.When the source that adjusting has a no area of image is shown, the present invention does not resemble care will make the concrete use of being concerned about invalid area of image its amount that is shown as the dead space by television set in adjusting has the process in source of dead space.

The data sampling restriction makes the generation of high resolution pictures become complicated in the auxiliary image signal treatment channel, and its picture shows the same big with main image signal dimensionally.Can develop the whole bag of tricks for overcoming these difficulties.

Combination shown in Fig. 2 has structure of the present invention, is adapted to 2f _HTotal calcspar of the wide screen television of line scanning operation, and enerally designated 10.TV 10 generally comprises picture intelligence importation 20, movement or TV microprocessor 216, has the widescreen processor 30 of widescreen processor 309,1f _HTo 2f _HConverter 40, deflection circuit 50, rgb interface 60, YUV to RGB converter 240, picture tube driver 242, direct-view or projection kinescope 244 and power supply 70.For convenience of explanation, various circuit are divided into the circuit bank of difference in functionality square, and do not plan to be confined to particular location, packing or the specific connection each other of these circuit.

Picture intelligence importation 20 receives the many composite picture signals from different eikongens adaptively.These picture intelligences can be selected to show as the auxiliary image signal of advocating peace with switch.RF switch 204 has two antenna input ANT1 and ANT2.These expressions are as the input of built on stilts (off-air) antenna reception and cable reception.RF switch 204 which antenna input signal of control are supplied with first tuner 206 and second tuner 208.The output of first tuner 206 is the input of monolithic controller 202, and the monolithic controller is carried out a series of functions relevant with image control with field deflection with tuning row.Shown specific single-chip model is TA7730.Be derived from the TV1 input that baseband plot picture signals VIDEO OUT that the signal of first tuner 206 produces inputs to presentation switch 200 and widescreen processor 30 in single-chip.Other base band image inputs of presentation switch 200 are designated as AUX1 and AUX2.These can be used for video frequency camera, compact disc player, video tape recorder, game machine etc.The output of presentation switch 200 is designated as SWITCHED VIDEO, is subjected to the control of movement or TV microprocessor 216.SWITCHED VIDEO is another input of widescreen processor 30.

The switch SW 1 of widescreen processor 30 is selected between TV1 and SWITCHED VIDIO signal, and to select the source of SELECTED COMP OUT picture intelligence, SELECTED COMP OUT picture intelligence is an input signal of Y/C decoder 210.Y/C decoder 210 can be used as self adaptation row comb filter and realizes.Also having two eikongen S1 and S2 also is the input of Y/C decoder 210.S1 represents different S-VHS sources with S2, each source is made up of the luminance and chrominance information of separating: one resembles the part that is combined into the Y/C decoder in some self adaptation row comb filter, perhaps also can be used as the switch that independent switch is implemented, TV microprocessor 216 is responded, to select a pair of luminance and chrominance information as the output signal that is marked with Y-M and C-IN respectively.After this selected luminance and chrominance information to just being counted as main signal, and handle through main signal channel.Comprise-M or-marker of MN belongs to main signal channel.Carrier chrominance signal C-IN returns to single-chip 202 again by widescreen processor, in order to produce color difference signal U-M and V-M.Herein, U is the equivalent representation of (R-Y), and V is the equivalent representation of (B-Y).Y-M, U-M and V-M signal are transformed to digital form in widescreen processor, use for further signal processing.

Second tuner 208 that is defined as the part of widescreen processor 30 on the function produces baseband plot picture signals TV2.Switch SW 2 is selected to the input signal of Y/C decoder 220 between TV2 and SWITCHEO VIDEO signal.Y/C decoder 220 can be used as self adaptation row comb filter and implements.Switch SW 3 and SW4 select between the luminance and chrominance information in the external image source that Y-EXT and C-EXT were exported and be denoted as to the brightness and the colourity of Y/C decoder 220.Y-EXT is corresponding with S-VHS input S1 with the C-EXT signal.Y/C decoder 220 and switch SW 3 and SW4 can be combined into some self adaptation row comb filter.After this output of switch SW 3 and SW4 be considered to auxiliary signal, handles through the auxiliary signal passage.Selected brightness output is designated as Y-A.Comprise-A ,-AX and-marker of AUX belongs to the auxiliary signal passage.Selected carrier chrominance signal changes color difference signal U-A and V-A into.Y-A, U-A and V-A signal transition are that digital form is used for further signal processing.The switching construction of video signal source has very big flexibility in the main and auxiliary signalling channel in the selection in the source of the different piece of handling the different pictures display format.

Supply with sync separator 212 with the pairing composite synchronizing signal COMP SYNC of Y-M via widescreen processor.The row and the field synchronization component that are respectively H and V are the inputs of vertical countdown 214.Vertical countdown produces the field reset signal that directly is sent to widescreen processor 30.Widescreen processor produces fields inside reset output signal INT VERT RST OUT, delivers to rgb interface 60.Rgb interface 60 comprises switching device, and this switching device is selected between the field synchronization component in fields inside reset output signal and outside RGB source, produces the field synchronization component SEL-VERT-SYNC through selecting, and delivers to deflection circuit 50.The row of auxiliary image signal and field sync signal are produced by sync separator in the widescreen processor 250.

1f _HTo 2f _HConverter 40 is responsible for changing interleaved picture intelligence into line by line scan non-interlaced signal, and for example, each horizontal line is shown secondary, or capable by inserting adjacent level to same, produces one group of additional horizontal line.In some example, using selectively moves ahead earlier or insert row depends on detected mobile degree between opposite field or frame.Converter circuit 40 cooperates visual RAM420 to operate together.Image RAM can be used for storing in the frame one or many, thereby can show line by line.Be designated as signal Y-2f shown in Fig. 2 _H, U-2f _HAnd V-2f _HThe pictorial data through conversion be added to rgb interface 60.

Rgb interface 60 makes by the picture intelligence importation and can select to supply to show through the pictorial data or the outside rgb image data of conversion.It is believed that outside rgb signal is to be adapted to 2f _HThe wide display format of scanning compares signal.The field synchronization component of main signal is supplied with rgb interface by the INT VERTRSTOUT output of widescreen processor, makes corresponding to the synchronizing signal of selected scenes of main picture or external image to use for deflection circuit 50.The operation of wide screen television makes the user can select outside rgb signal by producing inner/outer control signal INT/EXT.Yet,, might damage cathode ray tube or projection tube if can cause the vertical contraction of grating when selecting the input of outside rgb signal not have sort signal again.Therefore, the existence of rgb interface electric circuit inspection outer synchronous signal is crossed selection to non-existent outside RGB input to avoid this infringement.WSP microprocessor (WSP μ p309) provides colored for outside rgb signal and tone control.

Widescreen processor 30 can comprise picture-in-picture processor 301, handles in order to auxiliary image signal is carried out distinctive signal.Term picture-in-picture (picture-in-picture) often english abbreviation is PIP or pix-in-pix.For this function, gate array 300 is advocated peace with the possible display format combination of quite a lot of kind and is assisted the picture intelligence data, and for example auxiliary signal shows on main viewing area or shows in invalid visual rim area.Picture-in-picture processor 301 and gate array 300 are under the control of widescreen microprocessor (WSP μ p).The WSP microprocessor responds to TV microprocessor 216 by universal serial bus.Universal serial bus comprises the signalling channel of data, clock signal, enabling signal and reset signal.Widescreen processor 30 also produces compound vertical blanking/reset signal, as three level grooves top (sandcastle) signal.Another is selectable, and field blanking signal and reset signal can be used as signal separately and produce.Composite blanking signal is supplied with rgb interface by video signal input section.

The deflection circuit 50 that illustrates in greater detail in Fig. 4 receives selected 2f from widescreen processor received field reset signal from rgb interface _HLine synchronizing signal and the control signal of adding from the widescreen processor reception.These additional control signals and horizontal phasing control, a size adjustment are relevant with the thing pincushion correction.Deflection circuit 50 is given widescreen processor 30,1f _HTo 2f _HConverter 40 and YUV to RGB converter 240 provide 2f _HFlyback pulse.

The operating voltage of whole wide screen television is produced by power supply 70, and power supply 70 can be powered by the electric main electric current.

Consult Fig. 2 again, the critical piece of widescreen processor is gate array 300, picture-in-picture circuit 301, mould/number and D/A (not shown), second tuner 208, width processor microprocessor and widescreen output coder.Gate array 300 and included signalling channel and function have more detailed diagram in Fig. 3.Gate array 300 is responsible for the pictorial information from the auxilliary signalling channel of advocating peace is made up, and shows to realize compound widescreen, for example shows the image with picture-in-picture or other multi-source display formats on screen.By a 1f who follows the trail of selected source _HThe phase-locked loop of signal can be gate array clock information is provided.Main image signal is with analog form, and yuv format is supplied with widescreen processor, is as shown in Figure 2 the signal that is designated as Y-M, U-M and V-M from Y/C decoder 210 and single-chip 202.These signals use the known method (not shown) of A/D and D/A converter to become digital form for digital control usefulness from simulation on demand, and become analog form for reading required pictorial information from numeral again later.

Generally represent chrominance component signal with symbol U and V, U and V can be designated as or represent R-Y or B-Y signal, perhaps represent I and Q signal.The brightness bandwidth of being taken a sample is limited to 8MHz, because system clock frequency is 1024f _HOr be approximately 16MHz.Independent analog/digital converter and Jie's analog switch can to the sampling of colourity component data, because U and V signal are limited to 500KHz, or be 1 1.5MHz to width by multiplexing.Can produce the beginning of horizontal pulse at the section start of each level image row, make multi-path transmission structure synchronous, trigger in horizontal line scan period then, this is shifted to make Y and UV data, with the pairing of correctly will taking a sample.Each UV must match with the corresponding V element of same vector, to prevent colour shift to representing a vector.

PIP circuit and/or gate array can comprise and be used for being compressed the device that still can improve the resolution of superimposed auxiliary data on picture under the situation in data, people have developed the scheme that a series of data reduce and data are recovered, and for example comprise paired pixel compression and shake and go shake.And, plan the different jitter sequences that comprise isotopic number not and comprised the not different pixels in pairs compression of isotopic number.A series of particular datas reduce and recovery scheme in one of can select by WSP μ p309 so that the displayed image of each particular types picture display format has the resolution of maximum.

Gate array comprises the interpolater that cooperates line storage to work together, and line storage may be embodied as push-up storage or FIFO356 and 358.Interpolater and FIFO are used on request main signal being taken a sample again.Additional interpolater can be taken a sample to auxiliary signal again.Clock in the gate array and the synchronous circuit control auxilliary signal of advocating peace, and comprise it is combined as have Y-MX, the Data Control of the single outputting video signal of U-MX and V-MX component.These output components by with 1f _HTo 2f _HThe D/A (not shown) that converter 40 links to each other is changed into analog form.The analog form signal that is designated as Y, U and V is by 1f _HTo 2f _HConverter 40 is converted to non-interlace.

In order to regulate the ratio of width to height that is shown signal, with according to customer requirements, the advantage of the horizontal or vertical demonstration span that performance can supply can be regulated the operation of deflection circuit on demand.Figure 4 illustrates the more details of deflection circuit 50.Circuit 500 can be provided with according to the vertical dimension for realizing that the necessary vertically passing scanning amount of different display format is regulated grating.As shown in the figure, constant-current source 502 provides the constant current IRAMP that makes 504 chargings of vertical slope electric capacity.Transistor 506 is connected in parallel with vertical slope electric capacity, periodically makes capacitor discharge according to vertical reset signal.Without any adjusting the time, electric current I RAMP provides maximum can supply the vertical dimension of the usefulness of grating.This can with for will be more corresponding than the scope that signal source takes the scanning of the required vertically passing of widescreen display through 4 * 3 display formats of expansion.For the situation of the less vertical raster size of needs, adjustable current source 508 is according to I _RAMPMake electric current I _APJVariable change direction so that vertical slope electric capacity 504 charges more slowly, reach than small leak.508 pairs of vertical dimension conditioning signals of variable current source respond.This signal exists with analog form, produced by vertical dimension control circuit 1030 shown in Figure 9, thereby vertical dimension automatically regulates a scope continuously, rather than is converted to another size suddenly from a size.Vertical dimension adjuster 500 is with manually vertical dimension adjuster 510 is independent each other, and manually the vertical dimension adjuster can be that back plate adjusting knob is realized with a potentiometer.In either case, frame deflector coil 512 receives the drive current of suitable amplitude.Horizontal deflection is regulated and is in kind provided.Horizontal size is by phase regulating circuit 518, thing pincushion correction circuit 514,2f _HPhase-locked loop 520 and line output circuit 516 changes.

Rgb interface circuit 60 roughly is shown among Fig. 2.At 1f _HTo 2f _HThe signal that selection finally will show between the output signal of converter 40 and the outside RGB input signal.Concerning wide screen television described herein, outside RGB input signal is assumed that wide display format ratio, and progressive-source, composite blanking signal also can obtain from video signal input section 20.The outside 2f of outside rgb signal _HComposite synchronizing signal is access in, and is connected to the external sync detection signal of widescreen processor 30 with generation.Selection to inside or outer synchronous signal is to be produced by WSP μ p 309, and signals to rgb interface by the INT/EXT line.Selection to inside or external video source is selected by the user.Yet if the user has by mistake selected the in fact outside RGB source of this provenance for using, one offsets control signal and can prevent to select RGB source, this outside.Rgb interface 60 also receives color harmony color control signal from WSP μ P 309.

Wide screen television can be arranged to the optional scheme by the user, by selecting over-scanning amount, removes expansion or compressed image and regulates the form ratio.Similarly, can reach the special-effect of the picture-in-picture effect that for example needs the picture resolution adjustment.Picture-in-picture processor comprises that mould/analog-to-digital conversion apparatus, timing and control circuit and D/A part are in order to adjust resolution; To regulate realization with corresponding deflection for reaching desired effect.

Known picture-in-picture processor is the CPIP chip of Thomson consumer electronics companies exploitation, CTC140 picture-in-picture (CPIP) the technical training handbook that provides as Thomson consumer electronics companies (Indianapolis, the state of Indiana) is introduced.In the single-image pattern, or in picture-in-picture mode, might make the user can change some relative sizes that are shown picture, for example single-image selected portion (for example) zoom mode step by step.Simultaneously, under zoom mode, the user can search for, or the whole image that pans, and with the forms such as (quiet frames) that freezes frame, shows little, big or through the picture of zoom.

This picture-in-picture processor can be under some a kind of patterns of selecting display mode compressed video data asymmetricly.In an operator scheme, for example, picture with compression in 4: 1, compresses with 3: 1 in vertical direction in the horizontal direction.Certainly, asymmetric compression makes the picture that is stored among the visual RAM produce the picture of the ratio of width to height distortion.Yet, if these pictures for example are read out with the channel scanning pattern like that by normally, being presented at 16 * 9 display formats than on the screen, this picture can correctly present so.Picture takes screen and goes up desired zone, does not have the ratio of width to height distortion.The asymmetric compression of picture-in-picture processor makes to shield 16 * 9 goes up the generation particular display format, and need not outside accelerating circuit.

In order to handle with advocate peace auxilliary (for example PIP) signal relevant expansion and compression, to comprise the adjustment of deflection circuit and resolution, in Fig. 3 with main signal channel 304, auxiliary signal passage 306 and output signal channel 312 in the main block diagram form diagram gate array 300.Gate array also comprises clock/synchronous circuit 320 and WSP μ p decoder 310.The main circuit of the data of WSP μ P decoder 310 and the above-mentioned sign of address output line (being designated as WSP DATA) supply and each of passage and picture-in-picture processor and resolution processes circuit.In example shown in Figure 2, shown PIP301 and other elements separate with gate array 300 in widescreen processor 30.Be appreciated that some circuit by or be not defined as the part of gate array, to a great extent for for the purpose of the convenience of simplified illustration structure of the present invention, because or the function that adding adds in gate array, perhaps remove some functions by some circuit are told from gate array, this is easily.

The also false on demand expansion of being responsible for the video data of main video channel if required of gate array.Compression and amputation are to realize the different pictures display format.Consult Fig. 3, luminance component Y-MN is stored in first in first out (FIFO) line storage 356, and memory time, length depended on the attribute that luminance component inserts.The chromatic component U/V-MN of combination is stored among the FIFO358.Auxiliary signal brightness and chromatic component Y-PIP, U-PIP and V-PIP are produced by demultiplexer 355.Luminance component experiences resolution processes on request and as mentioned above in circuit 357, and is expanded by interpolater 359 on demand, produces the Y-AUX signal as output signal.

In some example, the auxiliary demonstration can show the same big with main signal.The memory limitations that is associated with picture-in-picture processor and visual RAM350 may cause taking big display area, the quantity of data point or pixel is not enough, in this case, the pixel that resolution processes circuit 357 can be used for auxiliary video signal recovers, that is, lose pixel place insertion pixel in data compression or during reducing.The pixel that inserts can be defined by the repetition or the adding of some adjacent pixel values.High dither/go wobble structure also can be come into force.

Accessory channel is with 640f _HSample at rates, and the main channel is with 1024f _HSample at rates.Accessory channel FIF0354 will be the main channel clock frequency from the transformation of data of accessory channel sampling rate.In this process, the picture intelligence experience $\frac{8}{5}\×\frac{1024}{640}$ The compression of ratio.This is than greater than being correct to show that auxiliary channel signal is necessary Compression ratio.Therefore accessory channel must be expanded to the little picture of correct demonstration 4 * 3 by interpolater 359.Interpolater 359 is by itself the interpolater control circuit 371 that WSP μ P340 responds to be controlled.The needed propagation of interpolater is

This spreading coefficient X is determined by following formula: $X=\frac{640}{1024}\×\frac{4}{3}=\frac{5}{6}$

Chromatic component U-PIP and V-PIP postpone a time span by circuit 367, and this time length depends on the interpolation attribute of luminance component, produce U-AUX signal and V-AUX signal as output.By the enabling signal of reading of control FIFO 354,356 and 358, Y separately, U and the V component of the auxilliary signal of advocating peace are combined in the transducer separately 315,317 and 319 of output signal channel 312.315,317 and 319 pairs of output translator control circuits 321 of multiplexer respond.The beginning, horizontal line count signal, field blanking reset signal of 321 pairs of clock signals of output translator control circuit, row signal and respond from the high-speed switch output signal of picture-in-picture processor and WSP μ P340.Supply with separately D/A 360,362 and 364 respectively through the brightness of conversion and chromatic component Y-MX, U-MX and V-MX, and through low pass filter separately.The various functions that picture-in-picture processor, gate array and data reduce circuit are controlled by WSP μ P.WSP μ P connects TV μ P216 by universal serial bus and responds, and universal serial bus can be four lines as shown in the figure, has the data of being used for.Four transmission lines of clock signal, enabling signal and reset signal, WSP μ P is by the different circuit communications of WSP μ P decoder 310 with gate array.

In one case, for avoiding the distortion of display frame the ratio of width to height, must with

Ratio compression 4 * 3NTSC image.In another case, image can be expanded, to carry out the horizontal zoom operation that is attended by VZW usually.Horizontal zoom operation up to 33% can by reduce compression ratio to less than Reach.The sample interpolation device is used for new pixel location is recomputated input imagery because the brightness image bandwidth for the S-VHS form up to 5.5MHz, occupy for 1024f _HClock is the significant percentage of the folded picture frequency rate of Nyquist (Nyquist) of 8MHz.

As shown in Figure 3, brightness data Y-MN is through interpolater 337 in the main signal channel 304, and this interpolater 337 recomputates sampling value based on the compression or the expansion of image.The function of switch or path selector 323 and 331 is the layouts that oppositely change main signal channel 304 with regard to the relative position of FIFO 356 and interpolater 337, especially, these switches are selected, be to be positioned at before the FIFO356, still be positioned at before the interpolater 337 by picture expansion requirement FIFO 356 by picture compression requirement interpolater 337.Switch 323 and 331 pairs of path control circuits 335 respond, and path control circuit 335 responds to WSP μ P again.Auxiliary image signal is for being stored among the visual RAM by compression, and only just needs expansion for practical purpose.Therefore, in the auxiliary signal passage, need not the switch of analogy.

For by using FIFO to realize image compression, for example can be under an embargo and write FIFO 356 every three samplings.This just constitutes Compression.The function of interpolater 337 is to recomputate the brightness sampling that writes FIFO, and the data of therefore reading FIFO are smooth, rather than uneven.Expansion can the mode just in time opposite with compression realize.Under the situation of compression, write enabling signal at the additional clock gated information that the inhibit pulse form is arranged.Be growth data, the clock gated information is applied to be read on the enabling signal.This makes and suspend data from FIFO 356 when data is read.Interpolater 337 function of trailing FIFO356 in this process just recomputates sampled data in this case, make its from uneven become smooth.Under spread scenarios when suspending data from the FIFO356 sense data with when being recorded into interpolater 337.The situation that data were passed through interpolater 337 continuously when this was different from compression.To compressing and expand both situations, the operation of clock gating can easily be carried out with the method for synchronization, that is, incident can be based on system clock 1024f _HRising edge and take place.

The interpolation of auxiliary signal occurs in Y, U, V, 8: 1: 1 field memories that PIP circuit 301 in the auxiliary signal passage 306 is controlled among the visual RAM 6, with the video data of storage input.The output of this visual RAM is connected to 4 among Fig. 3 to 8 bit changers 352.Image RAM keeps two video datas in some memory cell.Each memory cell keeps 8 bit data.One 6 Y (brightness) sampling is arranged (at 640f in per 8 memory cell _HTake a sample) and 2 other positions.These two other positions can be used for keeping U or V sampling (at 80f _HThan taking a sample under the low rate) part.Alternatively in addition be these two and also can be used for indicating the field of which type to be written into visual RAM.Owing in visual RAM, store two field data,, all be read out in reading scan period two field so whole visual RAM is read in the display cycle.PIP circuit 301 can determine to read which to be shown from memory like this.The PIP circuit is always read and that class field that just is written into a type opposite, to overcome mobile tearing (motion tear) problem.If a type that is read out is an opposite types that is shown, be stored in so among the visual RAM even field when its when memory is read, reversed by the top line of deleting this.Consequently little picture keeps correct interlacing, and not mobile tearing phenomenon.

Clock/synchronous circuit 320 is produced as operation FIFO354,356 and 358 required reading and writing and enabling signals.The FIFO of the auxiliary signal of advocating peace passage makes for can be with writing data into memory for those parts that show needed each image row successively.From main or accessory channel one selectively of data, rather than two be written into, and will be presented on from the data in each source in the same delegation or some video line of display on demand.Accessory channel FIFO354 and auxiliary image signal write synchronously, but synchronously read from memory with main image signal.Main video signal component and main video signal synchronously read in FIFO 356 and 358, and synchronously read from memory with main image signal.How read function continually in the switching back and forth between the accessory channel of advocating peace, change with selected special certain effects.

By the read and write start-up control signal of control line storage FIFO, for example can realize different certain effects through the side by side pictures of amputation.For example under the situation of the display frame arranged side by side of amputation, the start-up control signal FIFO 354 that writes of accessory channel is effectively in the portion of time that shows effective line period, to finish intercepting.

In each FIFO, pictorial data is read out at a particular point in time through buffering.The effective coverage of time that can sense data from each FIFO is determined by selected explicit form.Under amputation pattern arranged side by side, the main channel image can show that the accessory channel image then is presented at right-hand part in the left side of display screen.The optional video section of waveform is different to the accessory channel of advocating peace.Main channel FIFO read the start-up control signal be the effective display line cycle that shows 50% during effectively, it is initial with the beginning (the and then blanking back porch of this vision signal) of effective video.So accessory channel read the start-up control signal be another of effective display line cycle during 50% effectively, it serves as beginning and with the termination that is initiated with in video forward position, main channel with the back edge of main channel enabling signal.It is preferably synchronous with their FIFO input data (main or auxiliary) separately to write the start-up control signal, and reads the start-up control signal and the main channel vision signal is synchronous.

Two kinds of signals are shown as another example side by side on the display screen of for example 16 * 9 wide display format ratio.Most of NTSC signals represent that with 4 * 3 forms this is corresponding with 12 * 9.The NTSC picture of two 4 * 3 display format ratios can be displayed on the display screen of same 16 * 9 display formats ratio.This just must or with the picture amputation or with picture extruding 33%.If amputation or be expressed to: because picture loses or cause the ratio of width to height distortion and during the unacceptable degree of user, then will be made up than the amputation of small scale and distortion may easier acceptance.Look consumer taste, select by switch input and/or programming, the ratio of picture capturing and the ratio of width to height distortion can be arranged on any value in certain scope between 0% to 33% limit.As an example, two side by side pictures can be shown as 16.7% and be extruded and 16.7% cut out, thereby each adverse effect is reduced to minimum.

Show that than the level that shows the time is identical with 4 * 3 display formats than showing for 16 * 9 display formats, because the both has the nominal line period of 62.5 microseconds.For keeping correct the ratio of width to height not have distortion, ntsc video signal must be accelerated 4/3 times, this 4/3 coefficient by two display formats than calculating: $\frac{4}{3}=\frac{16}{9}\÷\frac{4}{3}$

According to aspects of the present invention, use variable interpolater to come the accelerating video signal.In the past, use FIFO, realize similar functions with different clock frequencies in input and output.As a comparison, if two NTSC4 * 3 display formats are presented at one 4 * 3 display format than on the display screen than signal, each picture must be distorted or amputation, or certain combination of two kinds, reaches to cut down 50%.Compare with use needed acceleration for widescreen, this acceleration is unnecessary.

In a word, image demonstration and deflection system are synchronous with main video signal.As explained above, main video signal must be accelerated, to take widescreen display.Auxiliary video signal must show vertical synchronization with first vision signal and video.Auxiliary video signal can postpone the part field duration in the field memories, is expanded in line storage then.Auxiliary video data and main video data be to realize synchronously by using as the visual RAM350 of field memory and first in first out (FIFO) the line storage device 354 that is used for spread signal.

Yet the asynchronous attribute of read and write clock pulse does not need to take steps to avoid the read/write pointer collision.Old data are read out from FIFO before having an opportunity to write FIFO at new data, and the read/write pointer collision will take place.Also had before old data have an opportunity to be read out FIFO, when new data is write full memory, read/write pointer also can take place collide.The size of FIFO is with relevant for avoiding read/write pointer collision to be considered to the minimum row memory capacity of reasonable need.

Picture-in-picture processor is operated in this manner, the auxiliary video data be with the input auxiliary video signal capable synchronized component synchronously with 640f _HClock is sampled.This operation makes the vertical direction sampled data can be deposited in visual RAM.Data must be with identical 640f _HSpeed is read from visual RAM.General nonsynchronous attribute in auxiliary image signal source owing to advocate peace, data can have the ground of correction from visual RAM and vertically shown.Auxiliary signal and main signal is synchronous for convenience, after visual RAM output the line storage with independent write and read port clock is set in the auxiliary signal passage.

Because from accessory channel FIFO read and write data is nonsynchronous, it is more faster than writing clock frequency to read clock frequency, so the read/write pointer possibility of collision is arranged.Formerly the old data of having been read have newly been write data and receive before replacing the read/write pointer collision will take place when reading enabling signal.Must keep the interlacing integrality simultaneously, in first example, for the collision of avoiding read/write pointer in accessory channel FIFO must be selected fully big memory.

Wide display format is the signal of different the ratio of width to height than the special benefits of TV, comprises that relative standard's 16 * 9 subtitle region signals can be expanded, to take wide display format display screen, although possibility must be to signal interpolation, so that additional vertical resolution to be provided.According to one aspect of the present invention, provide automatically and detect the invalid area of image feature that is had in the signal of handling according to different the ratio of width to height automatically a kind of the ratio of width to height display screen with the continuous variable circuit.For example, the present invention can operate in detect in the signal be sent out or read for show with 4 * 3 narrower ratios have wide than (for example, the top of subtitle region form 16 * 9) and the invalid area of image of bottom, and realize narrower demonstration automatically, and comprise that the broad display format (for example shows than subtitle region than signal (for example, 4 * 3), 16 * 9) expansion, thereby,, use and all can supply the viewing area by consumer taste as the above-mentioned discussion of this paper.Similarly, available when wide display screen, and can realize horizontal extension by the same manner will show narrower signal the time.Utilization is according to the circuit of foregoing invention, uses in expansion, compression or the amputation selection scheme of being discussed any or all can realize expansion.Explain automatic caption district detector in detail in conjunction with Fig. 5-9,4 * 3 and 16 * 9 the ratio of width to height of using the relative standard are as nonrestrictive example.

In order to increase subtitle region signal (vertical height that for example has 4 * 3 signals of 16 * 9 active zones and untapped top bar and sill strip), the vertical scanning rate of displayed image so increases, so that the black of picture top and bottom or dim district be eliminated, or showing at least and reducing.Automatic caption district detector based on: vision signal generally corresponding to the supposition of figure shown in Figure 5.The no efficient image in A district and C district, or at least the image brightness level less than the predetermined brightness threshold value with for example can be black or grey signal or the constant colored filaments of sun.There is efficient image in the B district, or at least the image brightness level greater than the predetermined luminance threshold value with generally on brightness, color saturation and/or tone, have significant change.The time interval separately in A, B and C district is the function of subtitle region form that for example can from 16 * 9 to 21 * 9 scopes.The time width in A and C district approximately respectively is 20 row for 16 * 9 subtitle region forms.Letterbox detector detects A and/or C district luminance level.If find efficient image at A and/or C district, or minimum at least visual brightness value, then the letterbox detector generation for example is the output signal of logical zero, to represent that 4 * 3 common display formats are than NTSC signal source.Yet, if image only detects in the B district, rather than detecting at A and C district, this image is inferred to be the subtitle region signal source so.In this case, output signal will be a logical one.

As shown in Figure 6, can improve the operation of this detector by hysteresis.In case detect the subtitle region signal of specific effective the ratio of width to height, before demonstration being changed into, may need the minimum number of fields continuously of non-caption signal or the subtitle region of different the ratio of width to height to the necessary state of new the ratio of width to height signal.Before demonstration being switched to broad or narrower screen pattern, need minimum number of fields transition.

The circuit 1000 of realizing this technology is shown in Fig. 7.Circuit 1000 comprises linage-counter 1004, a counter 1006 and detector circuit 1002, carries out above-mentioned algorithm and analyze vision signal in this circuit.In brief, by first row and the last row that detect efficient image, this circuit is operated for the decision height, and carries out amputation, compression, expansion etc. according to user's selection scheme in detected variation picture.Suppose that purpose is to extend to all available vertical heights, then measure first row number and last row number, the mean value definition center row of this two row number number.Letterbox detector makes center row be positioned the vertical centre in operational full frame district then, and extends perpendicular picture linearly, first row and last row is placed on goes up most and lowest part (or press other selections of the user).Thereby the degree of expansion is by effective image area decision and be not for example to switch between 4 * 3 and 16 * 9 simply, and this device adapts to any demonstration ratio.

For many frame conditions, letterbox detector can be arranged to every frame and only refresh one time first row and last row counting.The scope that refreshes can be limited by filter, so that lentamente, for example shows to new the ratio of width to height through a few frame expansions or compression, thereby prevents because the variation that repeatedly little variation or noise cause causes shake.In order to realize this filter action, this device can go to change the threshold value that will exceed variation in the past making any response.This system is not subjected to the influence in dark (flat) of both lateral sides (blanking relatively), because it is just at A and C subtitle region expectation efficient image.

One of criterion that graphic extension takes according to maximum or maximum perpendicular takes realizes being shown in the flow chart of the structure of the present invention of first operator scheme among Figure 10 from maximum zoom degree.Certainly to detect that effective video also is possible in horizontal side slat, in the embodiment of this explanation, be only limited to the zone up and down of detecting presumable invalid image.This device by use first and last row number select expansion, compression and amputation parameter that several advantages are arranged.If Once you begin picture is carried out zoom, this zoom process is during through optimum value, and system can be evaluated and self obtain rapidly proofreading and correct along with field in succession.If subhead, sqtrom warning or similar side information appear at rim area, and they are used as, and effective video is capable to be detected, and picture is conditioned with second kind of operator scheme display frame, and this moment, the zoom degree was reduced.If side information disappears, first kind of operator scheme can be realized automatically or manually again.The boundary up and down of effective video that has or do not have side information is shown in Figure 11 (a).The detection is capable also as shown in the figure with shown first and final video.Shown in Figure 11 (b), system begins zoom and takes criterion according to any and make image occupies all over the screen.Picture degree on demand is exaggerated again then, to show detected side information (if the words that have).If for example no longer detecting side information, the amplification in the implementation and operation pattern once more in 10 seconds the predetermined time interval.If the last row of detected image is gone greater than first of displayed image less than the last row (shown in Figure 11 (b)) of displayed image or first row of detected image, perhaps the both has, and then can occur implementing again.

First and the last row that are detected are made comparisons with the minimum/maximum of being allowed, simultaneously just in case the value of first and the last row that are detected keeps former the ratio of width to height when dropping on beyond institute's permissible range.This can be avoided any response is made in for example appearance of blanking picture.For first frame after device starts, initial examination and measurement first and go at last and number packed into simply, and without filtering, and add that filtering regulates when after this needing.

Every row in the video field is calculated two gradients, with the line number of decision efficient image.Calculate two gradients and need four values: the minimum and maximum value of existing row and the minimum and maximum value that moves ahead earlier.First gradient of being appointed as positive gradient is to deduct the minimum value that moves ahead earlier by the maximum from existing row to form.Second gradient of being appointed as negative gradient is to be formed by the minimum value that the maximum that moves ahead earlier deducts existing row.Arbitrary gradient can be on the occasion of or negative value, this depends on image content, but two gradients can be ignored when being negative value.This is because may a gradient be negative value only once, and the size of positive gradient is always more than or equal to the size of negative gradient.This just can simplify circuit by the needs of cancellation compute gradient absolute value.If arbitrary gradient have above programming thresholds on the occasion of, then think the image or be presented on the existing row or be presented at move ahead earlier on.These values can be used by microprocessor, with first and last row of decision efficient image, thus specific the ratio of width to height of decision signal active zone.This decision has determined whether eikongen is the subtitle region form, thereby can further calculate to the excursion of deflection circuit with in order to change the required resolution circuit of shows signal on request.Mentioned that as this paper this transformation part can be by selecting to determine with the suffered amputation of signal or distortion or user that both are relevant.

Circuit 1010 block diagram form that are used for realizing this method of subtitle region evaluation or detection are shown in Fig. 8.Circuit 1010 comprises brightness input filter, maximum row (max) detector 1020, minimum row (min) detector 1022 and output 1024.The brightness input filter comprises finite impulse response (FIR) (FIR) level 1012 and 1014 and adder 1016 and 1010 pairs of digital brightness data Y-IN operations from widescreen processor of 1018 subtitle region testing circuits.Adopting input filter is in order to improve noiseproof feature and to make detection more reliable.This filter is essentially the FIR level of two cascades, has following transfer function: $H\left(Z\right)=\frac{1}{4}\×(1+Z^{-1})\×(1+Z^{-3})$

Every grade output is punctured into 8 (divided by 2) to keep the DC current gain of output.

Maximum row detector 1020 comprises two registers.First register is included in the maximum pixel value on the existing point (max pix) in the line period.It is started by a wide clock pulse that is designated as 80h value SOL (row beginning) in the beginning of every line period.The 80h value representation in 2 complement code forms (highest significant position is symbol) to a minimum value that eight-digit number is possible.This circuit is by being designated as LTRBX EN, up to the signal enabling of effective video capable 70%.Second register comprises whole maximum pixel value (maxline) and each line period that moves ahead earlier is refreshed once.The brightness data Y-IN of input compares with the existing maximum pixel value that is stored in max pix register.If it surpasses register value, the maxpix register was refreshed in next clock cycle.Max pix is included in this row makes it be activated in the whole cycle maximum when video line stops.In the beginning of next video line, the value of the max pix register maximum row register of packing into, this register is reset with 80h again.

Minimum row detector 1022 is worked except the minimum row register comprises the minimum pixel value that moves ahead earlier in the same manner.Minimum pixel value is by the initial 7Fh value that turns to.This value is maximum pixel value possible for 8 figure places in 2 complement code form.

Output 1024 will be got maximum row register value and minimum row register value, and deposit them in every row and refresh once 8 latchs.Calculate two gradients then, i.e. positive gradient and negative gradient.When in two gradients any be on the occasion of and greater than one of programming thresholds first row on, produce an enabling signal, the first row register is adorned with existing capable count value.Any is just and on the every row greater than programming thresholds in two gradients, produces another enabling signal, makes the last capable register existing capable count value of packing into.By this way, going register at last comprises last row in that threshold value is exceeded.These two kinds of enabling signals are only allowed between 24 row and 250 row that occur in every.This can be avoided switching transition and the mistake that causes is surveyed based on enclosed heading message (closed captioninginformation) and video recorder magnetic head.Every beginning, circuit reinitializes, and the value in first row and last row register is loaded into subtitle region terminating register separately.Signal LTRBX-BEG and LTRBX-END indicate the beginning and the termination of subtitle region signal respectively.

Fig. 9 graphic extension is as the automatic caption district detector of vertical dimension control circuit 1030 parts.The vertical dimension control circuit comprises letterbox detector 1032, vertical display control circuit 1032 and 3 attitude output devices 1306.According to structure of the present invention, automatic caption district testing circuit can be realized VZW or expansion automatically on request, for example will comprise that 16 * 9 display formats are expanded than signal than 4 * 3 display formats that subtitle region shows, and perhaps expand detected other display formats and compare signal.When output signal VERTICAL SIZE ADJ is timing, the vertical deflection height increases in required ratio, is generally whole vertical heights to use desirable vertical height.This makes 16 * 9 efficient images part of the subtitle region form part of 4 * 3 signals (for example) take 16 * 9 widescreens, and does not have the distortion of picture the ratio of width to height.Since display screen or each form ratio can have other particular values, the user select to be defined as to show on request this picture specific amputation or distortion.

The detector capable detection of effective video that can place one's entire reliance upon in automatic caption district perhaps can additionally comprise a circuit, is the subtitle region form in order to subtitle region signal source contained a code word or signal are decoded, discern this signal.This can accurately respond system to standard subtitle region form, and keeps proofreading and correct the ability of off-standard size.

Aforesaid this system can show the modification of multi-source or the quite a lot of kind through changing the demonstration of (for example amputation, expansion etc.) signal.The programming of WSP μ P309 can comprise a series of absent arrangements of presetting, wherein system's shows signal or combination of the signal through changing in the above described manner according to this.On the other hand, or in addition, the user can use screen to go up programming technique or similar approach is selected display format, for example discusses according to the selection in relevant each demonstration source.Arbitrary or whole source can specific the ratio of width to height (comprising the subtitle region form) be provided in the multi-source, and this refers to that efficient image must be not to be used for regional identical the ratio of width to height that this source shows on the display screen or in composite multi-source shows.WSP μ P309 can be arranged to each source is made to the necessary congener expansion of required demonstration, compression or other variations are provided.It is capable that this only needs that efficient image is detected in each source, and make capable the placing of efficient image adaptively efficient image be placed the required display position in viewing area.

Claims (8)

1. video display control system comprises:

A video display devices, it has wide format and shows ratio;

A mailbox detector is used for identification and looks the face signal, and this vision signal has the letterbox format in response to the line number separately of first and last scan line of detected effective video in described vision signal; With

Be used to be controlled at the device of the vertical image size on the described display unit, it has one first image height that is used for non-mailbox image and one second image height that is used for all mailbox images,

It is characterized in that:

An adaptive controller that is used for described mailbox detector, it operationally detects different letterbox formats with first kind of operator scheme by the number of scanning lines that makes described mailbox detector repeatedly upgrade described storage, so that repeatedly determine described image height, up to mailbox image of identification, and after the described letterbox format of identification, operationally come identification and the inconsistent image content of described letterbox format in described effective video by the number of scanning lines that makes described storage device upgrade described storage with second kind of operator scheme, and have only when described effective video and be detected capable first number of scanning lines that is less than described storage of videoscanning corresponding to a number of scanning lines or during more than the last number of scanning lines of described storage, redefine described image height, after the described inconsistent image content of identification, recover described first kind of operator scheme;

The described device that is used to be controlled at the vertical image size on the described display unit has a plurality of image height that respectively are used for described different letterbox format; With

Be used to produce a variable dimension of picture coefficient, be used to control the device of the described vertical image size of described control corresponding to described image height,

Thus, can discern different letterbox formats, and implement different display modes in during described first kind of operator scheme and sqtrom warning, and discern during described second kind of operator scheme in and show non-letterbox format.

2. control system according to claim 1 is characterized in that, described adaptive controller keeps described first kind of operator scheme to reach a time enough cycle, with at a described vertical image height of optimum level equalization.

3. control system according to claim 1 is characterized in that, described adaptive controller is manually controlled in response to one and is returned to described first kind of operator scheme from described second kind of operator scheme.

4. control system according to claim 1 is characterized in that, described adaptive controller automatically is returned to described first kind of operator scheme from described second kind of operator scheme.

5. control system according to claim 1 is characterized in that, described adaptive controller automatically is returned to described first kind of operator scheme from described second kind of operator scheme at a preset time after the cycle.

6. control system according to claim 1 is characterized in that, comprises the device that is used for during described first kind of operator scheme on described video display devices the centralized positioning vertically of described image.

7. control system according to claim 1 is characterized in that, comprises the device that is used for during described second kind of operator scheme on described video display devices the centralized positioning vertically of described image.

8. control system according to claim 1 is characterized in that, comprises the device that is used for during described the first and second two kinds of operator schemes on described video display devices the centralized positioning vertically of described image.

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