GB2114396A - Television line standard conversion - Google Patents
Television line standard conversion Download PDFInfo
- Publication number
- GB2114396A GB2114396A GB08301156A GB8301156A GB2114396A GB 2114396 A GB2114396 A GB 2114396A GB 08301156 A GB08301156 A GB 08301156A GB 8301156 A GB8301156 A GB 8301156A GB 2114396 A GB2114396 A GB 2114396A
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- Prior art keywords
- signal
- lines
- line
- television
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- Prior art date
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0135—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving interpolation processes
- H04N7/0137—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving interpolation processes dependent on presence/absence of motion, e.g. of motion zones
Abstract
An analog 625-line signal is applied to input 1 and converted to a digital signal A at 2. This signal is then delayed by delay means 3, 7, 8 to produce delayed signals C,D,B. Delay devices 3, 8 producing delays of one field period less half a line period and 7 a line period delay Signals C, D are averaged by circuit 12 while A and B are averaged by circuit 9 a movement detector 17 operates switch 11 so that if no movement is detected interpolation is carried out between adjacent lines of the same field (C,D) where as if movement is detected interpolation is carried out between the same lines of adjacent frames. The signal E is then supplied to a conversion arrangement 5 to provide the 1249-line signal I with the same field and frame rate. This signal is then interpolated at line rate 21 converted to analogue form 22 and applied to output 23. Thus the adverse effect of motion in the picture is reduced. <IMAGE>
Description
SPECIFICATION
Television line standard conversion
The invention relates to a line standard conversion system for converting an applied interlaced television signal having a given number of lines per picture into a converted interlaced television signal having substantially twice the number of lines per picture, both television signals having the same field frequency and two fields per picture, in which the applied television signal is converted into a television signal in which the line period is substantially half that of the applied signal and either the applied television signal or the converted television signal is subjected to the interpolation, between adjacently positioned television lines in the same field in the event that the video information present in appropriately positioned lines spaced a picture period apart is changing above a given rate.The invention also relates to a line standard conversion arrangement for use with the above system.
Such a system and arrangement are described in
German Offenlegungsschrift 2 444 069 for narrow bandwidth reception where for moving sections of a television picture interpolation takes place between adjacent television lines in the same field. In the case of sections of the picture where no movement occurs a change is made and instead of providing an interpolated signal the output is formed by sequentially using the signals of television lines from adjacent fields. The arrangement described in this
German document includes a threshold value switch which controls a mode switch determining the signal that is to be selected.The fact that a threshold is provided by the threshold value switch could mean that for small levels of movement the mode switch will stay in the position where the output signal is the sequential one taken from adjacent fields. With an output signal of this form even for.small levels of movement any display resulting therefrom would produce a break-up or tearing of the display where such movement is in the horizontal direction. Such a break-up of the picture is disturbing for the viewer especially when the display is of a relatively large size and high quality.
It is object of the present invention to provide a line standard conversion system and arrangement suitable for use with broadcast or wider bandwidth television signals and which does not produce such picture tearing.
The invention provides a line standard conversion system for converting an applied interlaced television signal having a given number of lines per picture into a converted interlaced television signal having substantially twice the number of lines per picture, both television signals having the same field frequency and two fields per picture; in which the applied television signal is converted into a television signal in which the line period igsubstantially half that of the applied signal and either the applied television signal or the converted television signal is subjected to interpolation between adjacently positioned television lines in the same field in the event that the video information present in appropriately positioned lines spaced a picture period apart is changing above a given rate, characterised in that said applied or converted television signal is also subjected to interpolation between correspondingly positioned television lines spaced a picture period apart symmetrical about said field in the event that the appropriately positioned television lines contain video information which is substantially stationary or changing at or less than the given relatively slow rate.
The system according to the invention has the advantage that with substantially stationary video information interpolation takes place between television lines containing the same information rather than from adjacent lines in the same or adjacent fields in which the information will differ and when the video information is not substantially stationary interpolation takes place between adjacent lines in the same field. By using a signal which is interpolated over a picture period when the video information is changing at a relatively slow rate the resulting display will produce slight blurring which it has been shown is subjectively more acceptable to a viewer than is picture tearing.
Where reference is made above and hereinafter to the video information changing at a given relatively slow rate it will be appreciated that no set rate can actually be provided which caters for all conditions as the effect of motion in a displayed picture depends very much on the picture content. The above expression therefore refers to an optimum rate at or below which motion in the video information produces little or no disturbing effect in a displayed picture of varying content. Such a rate is several times that necessary for a picture element to move a distance corresponding to that between adjacent lines over a picture period.
The interpolation may take place prior to the production of the converted television signal,the correspondingly positioned lines and the adjacently positioned lines being lines of the applied signal.
The invention also provides a line standard conversion arrangement for use with the line standard conversion system as claimed in any of the preceding claims, the arrangement comprising means for converting the applied television signal into the television signal in which the line period is substantially half that of the applied signal and means for subjecting either the applied signal or the converted signal to interpolation which interpolation means provides interpolation between the adjacently positioned television lines in the same field in the event that the appropriately positioned lines contain video information which is changing about the given rate, characterised in that the interpolation means subjects the appropriate television signal to interpolation between the correspondingly positioned television lines spaced a picture period apart in the event that the appropriately positioned lines contain video information which is substantially stationary or changing at or less than the given relatively slow rate.
The invention further provides a line standard conversion arrangement for converting an applied interlaced television signal having a given number of lines per picture into a converted interlaced television signal having substantially twice the number of lines per picture, both television signals having the same field frequency and two fields per picture, the arrangement comprising means for producing from the applied signal a first compressed television signal in which the line period is substantially half that of the applied signal and the adjacent lines of video information in the applied signal occupy alternate line periods of the first compressed television signal, means for subjecting said applied signal to interpolation and for producing therefrom a second compressed television signa! in which the line period is the same as that for the first compressed television signal and alternate lines contain interpolated video information, said interpolation means, when appropriately positioned lines in said applied signal contain video information which is changing above a given rate, deriving the second compressed television signal from adjacently positioned lines in the same field in the applied signal one line of which is that from which the first compressed television signal is then being derived, means for positioning the lines of video information in the second compressed television signal in the intervening line periods of the first compressed television signal to form the converted television signal, characterised in that said interpolation means derives the second compressed television signal from correspondingly positioned television lines in the applied signal spaced a picture period apart and positioned substantially one field period before and one field period after that line from which the first compressed television signal is then being derived in the event that the appropriately positioned television lines in the applied signal contain video information which is substantially stationary or changing at or less than the given relatively slow rate.
The applied signal may be applied to delay means having an output providing a signal delay time of one picture period, said applied signal and a signal from said delay means output being applied to a movement detector for determining which interpolated video information is to be used for said second compressed television signal, characterised in that said delay means has second and third outputs which respectively provide signals delayed by one field period less half a line period of the applied signal and one field period plus half a line period from the applied signal, the delayed signals at said second and third outputs being employed for interpolation between adjacently positioned lines in the same field whilst said applied signal and that from the first mentioned output of said delay means being employed for interpolation between correspondingly positioned lines spaced a picture period apart.The signal from the second output of said delay means may be applied to a first converter circuit for producing said first compressed television signal, said applied signal and that from the first output of said delay means being applied to a first averaging circuit whose averaged output is connected to the first input of a switch arrangement, signals from the second and third outputs of said delay-means being applied to a second averaging circuit whose averaged output is connected to a second input of said switch arrangement, the output of said switch arrangement being the selected one of the said averaged outputs under the control of said move
ment detector which output is applied to a second converter circuit for providing said second compressed television signal.The outputs of the first and second converter circuits may be connected to respective first and second inputs of a second switch arrangement, one connection being by way of second delay means having a delay time of one line period of the converted television signal, the second switch arrangement being operated at the line frequency of the converted television signal such that the video information from the first and second compressed television signals together from the converted television signal.
The above and other features of the present invention will be more readily understood from the following description, by way of example, with reference to the accompanying drawings in which Figure 1 is a block diagram of a line standard conversion arrangement according to the invention,
Figure2 shows signals present in the arrangement of Figure 1, and
Figure 3 is a block diagram of a converter circuit for use with the arrangement of Figure 1.
The arrangement to be described in relation to
Figure 1 is for converting a 625-line interlaced television picture having two fields per picture and 25 pictures per second into a 1249 line interlaced television picture having the same field and picture rates. It will however be appreciated that it could be used with other line doubling combinations, such as the previously mentioned 313 and 625 line conversion, and for other field and picture rates.
In Figure 1 a 625-line television signal of broadcast or greater bandwidth is applied to an input terminal 1 which is connected to an analogue-to-digital converter 2 where the analogue information of the signal at terminal 1 is coverted into digital form. The digital signal A (the positions with respect to time for this and other signals being shown in Figure 2) from the converter 2 is applied to a first delay device 3 having a delay of 312 q where It is one line period of the 625 line signal which is 64 tis, the delay of device 3 corresponding to one field period less one half of a line period.The delayed signal C from delay device 3 is conveyed through a first input 4 of a conversion arrangement 5 and applied to a first converter circuit 6 which is constructed and operates substantially the same as that of converter circuit 23 in Figure 1 of the above mentioned U.K. Patent Application 2000 413A though operating at twice the rate there described.
The output signal F from the converter circuit 6 contains the 625-line information with each line of information compressed to substantially half its original period (approximately 32,us) with each adjacent lines of compressed information being spaced by a corresponding period containing no video information.
The delayed signal C from delay device 3 is also applied to a second delay device 7 having a one line delay period zl and whose delayed output signal D is applied to a third delay device 8 having a delay of 312 x. The delay devices 7 and 8 may in fact be combined with a separate output for the delayed signal D or may be constructed or arranged in any way so long as it is possible to obtain the delayed signal D delayed by one line period Tt with respect to delayed signal C and the signal B delayed by one field period plus half a line period (313 Tt) with respect to delayed signal C. The signals A and B are 625 line periods of the applied signal apart and in fact at any instant relate to the same line in adjacent pictures.These signals are applied to respective inputs of a first averaging circuit 9 and the average of the two signals forms an interpolated signal which is applied to a first input 10 of a switch arrangement 11.
The signals C and Dare one line period of the applied signal apart and in fact at any instant relate to adjacent lines in the same field (except, of course when these lines are the last and first lines;of- adjacent fields). These signals (C and D) are similarly applied to respective inputs of a second averaging circuit 12 and the average of these two signals forms an interpolated signal which is applied to a second input 13 of the switch arrangement 11.
The moving contact of switch arrangement 11 selectively connects with one or other of its stationary contacts connected to the inputs 10 and 13 under the control of a control signal appliedto a control input 14. Although described in electro-mechanical terms the switch arrangement 11 would in practice be formed by the controlled switching paths in a semiconductor device or devices. The signal E present on the moving contact output of switch arrangement 11 is either that averaged over a picture period or that averaged over a line period and this signal is conveyed through a second input terminal 15 of the conversion arrangement 5 and applied to a second converter circuit 16.This second converter circuit is constructed and operates in.the same manner as the first converter circuit 6 to produce an output signal G which contains averaged 625 line information with each line compressed to substantially half its original period and adjacent lines of compressed information being spaced by a corresponding period with no video information.
The signals A and B are also applied to respective inputs of a movement detector circuit 17 the output of which is a two state signal which forms the control signal for application to the control input 14 of the switch arrangement 11. The movement detector circuit 17 compares the magnitudes of the two signals spaced one picture period apart at its inputs and if there is no difference or only a small difference (corresponding to no or only a small amount of movement) then its output is in a first state which causes the switch arrangement 11 to assume the position shown and signal E is that averaged over a picture period.If the difference between the magnitudes is greater than a given amount i.e. movement is detected, the output of movement detector circuit 17 assumes its second state to cause switch arrangement 11 to assume its other position and signal E is then that average over a line period.
The time compressed signal G is applied to a first input of a multiplexer 18 whilst compressed signal F is conveyed through a fourth delay device 19 providing a delay period T2 of one line period of the compressed signal (approximately 321is) to produce the delayed compressed signal H which is applied to the second input of the multiplexer 18. The multiplexer 18 switches between the signals at its signal inputs under the control of a control signal from a terminal 20, this control signal having a frequency 1/2fH2 where fH2 is the line frequency of the compressed signals to produce an output for the switch arrangement 18 and hence the conversion arrangement 5 which sequentially contains the signals G and H. In practice, one switching action of the multiplexer 18 is omitted every picture such that the output (signal I) is a 1249 line television signal.
The signal I is made up of lines obtained from signal C and lines electronically generated from signals either one line period (applied signal) or one picture period apart and it was considered beneficial to provide further interpolation for these signals and thus signal I is applied to an interpolator circuit 21 for providing interpolation at the line rate of the 1249 line signal. The interpolator circuit 21 is not described further and could be constructed on similar lines to those shown in the article from Philips
Research Reports mentioned above with the required changes to the delay line periods. If so desired such interpolation could alternatively be at field rate as described in U.K. Patent Specification 2 000 413A.The output from the interpolator circuit 21 is a digital signal which is applied to a digital-toanalogue converter 22 to provide at output terminal 23 a 1249 line analogue television signal.
Reference has not been made in the above description to the generation and provision of the signals which would in practice be required for controlling the operation of the various parts of the circuit. In practice the synchronising signals would be taken from the signal at terminal 1 and applied to a pulse generator which would generate the necessary control signals. This pulse generator would also generate the synchronising signals for the 1249 line signal and added to that signal at terminal 23.
Figure 2 shows the positions with respect to time of the television lines of the signals A two I. The signal
A will be seen to contain lines 1 to 3121/2 of a first field R1 (full lines) of a picture P1 and lines 3121/2to 625 of a second field R2 (dotted lines) of the picture
P1. The delay device 3 in providing a delay of 312 T1 causes line 1 of signal C to commence at the end of line 312 of signal A whilst the corresponding line of signal D commences one line later due to the action of the second delay device 7. The corresponding line of signal B is shifted 312 r1 with respect to signal D due to the effect of the third delay device 8 and it will be seen that signals A and B are one picture period apart (625 11) with correspondingly numbered lines coinciding. Signal E does not have its line periods numbered due to the fact that it is formed either from the average of signals A and B or signals C and
D depending on whether there is motion in that part of the picture. If no motion is present then signal E is the average of two like numbered lines spaced one picture apart. If the picture contains motion then signal E is the average of two adjacently numbered lines from the same field. Signal F is the compressed signal derived from signal C and from signal F it will be seen that each line is produced in compressed form at the end of the line period when it is applied to the converter 6. Signal G is the corresponding compressed signal obtained from signal E by con verter circuit 16.From signals F and G it will be seen that they only produce line information during alternate line periods at the converted rate of 1249 lines per field and that the lines of information are present in the signals at the same times and it is for this reason that signal F is delayed by one line period by by the fourth delay device 19 to produce signal H.
Signals G and H are alternately present at the output of the multiplexer 18 to form the signal I. The signal I therefore contains 1249 lines of infqrmation at the compressed rate per picture period with 6241/2 lines per field. In Figure 2 signals F, G, H and I are not strictly correct as they show 625 line periods per field but this has been done for the sake of simplicity.
Figure 3 is a block diagram of the converter circuit 6 or 16 of Figure 1. As previously stated this takes the form of the converter circuit 23 of Figure 1 of U.K.
Patent Application 2 000 413A and the same references are used for the same internal blocks as used in that application. The signal C or E which is applied through input4 or 15 of the conversion arrangement 5 is applied to an input 24 of the conversion arrangement of Figure 3. This input is connected to the moving contact of a first switch 24 controlled in a mannerto be described hereinafter from a first control input 26, the upper stationary contact of switch 25 being connected to a first line store 27 in the form of a shift register. Read in/read out of the store 27 is controlled from a first multiplexer 28 which is itself controlled from the control input 26.
The lower stationary contact of switch 25 is connected to a second line store 29 also in the form of a shift register and read in/read out of this store is controlled from a second multiplexer 30 which is itself controlled from a second control input 32. The outputs of the stores 27 and 29 are respectively connected to respective upper and lower stationary contacts of a second switch 31 also controlled from the control input 32, the moving contact of switch 31 being connected to the output 33 of the converter circuit 6/16. Each of the multiplexers 28 and 30 has two inputs which are respectively connected to clocking signal inputs 34 and 35.
In operation it will be assumed that at a given time the switches 25 and 31 and the multiplexers 28 and 30 (both in the form of controlled switches) are in the conditions shown in Figure 3. The input 24 receives a 625 line video signal whilst the first and second control inputs 26 and 32 receive square wave control signals at half the line frequency of the applied signal, the control signal at control input 26 being of opposite phase to that at input 32 such that each of the switches 25,28,30 and 31 are in the position shown for alternate one line periods (64 Zs) and then switch to occupy their other position during the intervening line periods. Clocking signal input 34 receives read-in clock pulses at 20 MRz whilst the other clocking signal input 35 receives read-out clock pulses at 39.97 MHz.The line of video present at input 24 is read into line store 2 by means of the 20
MHz clocking signal then being applied to the control input of store 27 via multiplexer 28. Read out of this store cannot take place at that time as the upper contact of switch 31 is not currently connected to output 33. This output is however connected through switch 31 to line store 29 which during the previous line period has had the previous line of information read into it. During the line period under consideration that stored information is read-out of store 29 in substantially half the time it was read in under the control of the 39.97 MHz clocking signal to produce a compressed line of information at the output 33 the period of which is that of a 1249 line signal.At the end of the line period at the applied signal rate under consideration the switches 25, 28, 30 and 31 reverse their position such that information is then read into line store 29 and read out from line store 27, this situation alternating line-by-line.
As described the information is read out of line store 27 or 29 during a period of approximately 32 its followed by a corresponding period with no information. If however each line store is a shift register with its output connected to its input then the information will be read out nearly twice during each read-out period. However, this is not detrimental to the operation of the conversion arrangement 5 as only one of these will be present in signal I during the action of multiplexer 18. As with Figure 1, switches 25,28,30 and 31 would not be electro-mechanical switches but formed from electronic components.
In the above described embodiment the interpolated signal E of either line or picture interval is produced prior to its application to the conversion arrangement 5. There is no reason however, why this signal should not be produced after conversion to a 1249 line signal.
With Figure 1 the described operation ofthe switching arrangement is such that it switches from one averaged signal to the other depending on the motion. There is no reason why an additional signal should not be produced, in a modification of the described embodiment, which is an average from the signal from the averaging circuits 9 and 12 and which forms the signal E for a condition where the A and B signals are not stationary but do not exhibit motion such that it is considered necessary to use the averaged C and D signals.
Although in the above description reference is made to the analogue signal at terminal 1 in Figure 1 being converted into a digital signal,there is no reason why the actions of interpolation and signal compression should not take place on the analogue signal which would make the analogue-to-digital conversion and subsequent re-conversion unnecessary.
Claims (9)
1. A line standard conversion system for converting an applied interlaced television signal having a given number of lines per picture into a converted interlaced television signal having substantially twice the number of lines per picture, both television signals having the same field frequency and two fields per picture, in which the applied television
signal is converted into a television signal in which
the line period is substantially half that of the applied
signal and either the applied television signal or the
converted television signal is subjected to interpola
tion between adjacently positioned television lines
in the same field in the event that the video
information present in appropriately.positioned lines
spaced a picture period apart is changing above a
given rate, characterised in that said applied or
converted television signal is also subjected to
interpolation between correspondih'gl positioned television lines spaced a picture period apart sym
metrical about said field in the event that the
appropriately positioned television lines contain video information which is substantially stationary
or changing at or less than the given relatively slow
rate.
2. A line standard conversion system as claimed
in Claim 1 characterised in that the'interpolation takes place prior to the production of the converted television signal, the correspondingly positioned
lines and the adjacently positioned lines being lines
of the applied signal.
3. A line standard conversion system substantially as herein described with reference to the accompanying drawings.
4. A line standard conversion arrangement for
use with the line standard conversion system as claimed in any of the preceding claims, the arrange
ment comprising means for converting the applied television signal into the television signal in which the line period is substantially half that of the applied signal and means for subjecting either the applied signal or the converted signal to interpolation which interpolation means provides interpolation between the adjacently positioned television lines in the same field in the event that the appropriately positioned lines contain video information which is changing about the given rate, characterised in that the interpolation means subjects the appropriate-televi- sion signal to interpolation between the correspondingly positioned television lines spaced a picture period apart in the event that the apprppriately positioned lines contain video information which is substantially stationary or changing at or less than the given relatively slow rate.
5. A line standard conversion arrangement for converting an applied interlaced television signal having a given number of lines per-picture into a converted interlaced television signal having substantially twice the number of lines per picture, both television signals having the same field frequency and two fields per picture, the arrangement comprising means for producing from the applied signal a first compressed television signal in which the line period is substantially half that of the applied signal and the adjacent lines of video information in the applied signal occupy alternate line periods of the first compressed television signal, means for subjecting said applied signal to interpolation and for producing therefrom a second compressed television signal in which the line period in the same as that for the first compressed television signal and alternate lines contain interpolated video information, said interpolation means, when appropriately
positioned lines in said applied signal contain video
information which is changing above a given rate,
deriving the second compressed television signal
from adjacently positioned lines in the same field in
the applied signal one line of which is that from
which the first compressed television signal is then
being derived, means for positioning the lines of
video information in the second compressed televi
sion signal in the intervening line periods of the first
compressed television signal to form the converted television signal, characterised in that said interpolation means derives the second compressed televi
sion signal from correspondingly positioned televi
sion lines in the applied signal spaced a picture
period apart and positioned substantially one field
period before and one field period after that line from which the first compressed television signal is then being derived in the event that the appropriate
ly positioned television lines in the applied signal contain video information which is substantially stationary or changing at or less than the given
relatively slow rate.
6. A line standard conversion arrangement as claimed in Claim 5 in which said applied signal is applied to delay means having an output providing a signal delay time of one picture period, said applied signal and a signal from said delay means output being applied to a movement detector for determining which interpolated video information is to be used for said second compressed televison signal, characterised in that said delay means has second and third outputs which respectively provide signals delayed by one field period less half a line period of the applied signal and one field period plus half a line period from the applied signal, the delayed signals at said second and third outputs being employed for interpolation between adjacently positioned lines in the same field whilst said applied signal and that from the first mentioned output of said delay means being employed for interpolation between correspondingly positioned lines spaced a picture period apart.
7. A line standard conversion arrangement as claimed in Claim 6 characterised in that signal from the second output of said delay means is applied to a first converter circuit for producing said first compressed television signal, said applied signal and that from the first output of said delay means being applied to a first averaging circuit whose averaged output is connected to the first input of a switch arrangement, signals from the second and third outputs of said delay means being applied to a second averaging circuit whose averaged output is connected to a second input of said switch arrangement, the output of said switch arrangement being the selected one of the said averaged outputs under the control of said movement detector which output is applied to a second converter circuit for providing said second compressed television signal.
8. A line standard conversion arrangement as claimed in Claim 7, characterised in that the outputs of the first and second converter circuits are connected to respective first and second inputs of a second switch arrangement, one connection being by way of second delay means having a delay time of one line period of the converted television signal, the second switch arrangement being operated at the line frequency of the converted television signal such that the video information from the first and second compressed television signals together form the converted television signal.
9. A line standard conversion arrangement substantially as herein described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08301156A GB2114396A (en) | 1982-01-29 | 1983-01-17 | Television line standard conversion |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8202571 | 1982-01-29 | ||
| GB08301156A GB2114396A (en) | 1982-01-29 | 1983-01-17 | Television line standard conversion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8301156D0 GB8301156D0 (en) | 1983-02-16 |
| GB2114396A true GB2114396A (en) | 1983-08-17 |
Family
ID=26281834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08301156A Withdrawn GB2114396A (en) | 1982-01-29 | 1983-01-17 | Television line standard conversion |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2114396A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2180714A (en) * | 1985-08-22 | 1987-04-01 | Rank Xerox Ltd | Imaging apparatus |
| EP0250632A1 (en) * | 1986-07-02 | 1988-01-07 | Deutsche ITT Industries GmbH | Digital frame frequency and line scan converter for colour television signals |
| EP0264966A2 (en) * | 1986-10-24 | 1988-04-27 | The Grass Valley Group, Inc. | Interpolator for television special effects system |
| EP0210861A3 (en) * | 1985-07-26 | 1988-11-02 | Sony Corporation | Apparatus for detecting television image movement |
| GB2243514A (en) * | 1990-02-09 | 1991-10-30 | British Broadcasting Corp | Generation of interlaced television signals by interpolation |
| EP0517385A2 (en) * | 1991-06-05 | 1992-12-09 | Salora Oy | A method of doubling the number of lines of a video signal received in the form of sequential samples |
| EP0622953A1 (en) * | 1993-04-22 | 1994-11-02 | Thomson Consumer Electronics, Inc. | Motion adaptive video processing system |
| EP0662767A2 (en) * | 1994-01-07 | 1995-07-12 | Texas Instruments Incorporated | Video display system with a digital line deinterlacing circuit |
-
1983
- 1983-01-17 GB GB08301156A patent/GB2114396A/en not_active Withdrawn
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0210861A3 (en) * | 1985-07-26 | 1988-11-02 | Sony Corporation | Apparatus for detecting television image movement |
| US4763192A (en) * | 1985-08-22 | 1988-08-09 | Rank Pullin Controls Limited | Imaging apparatus |
| GB2180714B (en) * | 1985-08-22 | 1989-08-16 | Rank Xerox Ltd | Image apparatus |
| GB2180714A (en) * | 1985-08-22 | 1987-04-01 | Rank Xerox Ltd | Imaging apparatus |
| EP0250632A1 (en) * | 1986-07-02 | 1988-01-07 | Deutsche ITT Industries GmbH | Digital frame frequency and line scan converter for colour television signals |
| EP0264966A2 (en) * | 1986-10-24 | 1988-04-27 | The Grass Valley Group, Inc. | Interpolator for television special effects system |
| EP0264966A3 (en) * | 1986-10-24 | 1991-02-13 | The Grass Valley Group, Inc. | Interpolator for television special effects system |
| GB2243514B (en) * | 1990-02-09 | 1994-03-23 | British Broadcasting Corp | Generation of interlaced TV signals by interpolation |
| GB2243514A (en) * | 1990-02-09 | 1991-10-30 | British Broadcasting Corp | Generation of interlaced television signals by interpolation |
| EP0517385A2 (en) * | 1991-06-05 | 1992-12-09 | Salora Oy | A method of doubling the number of lines of a video signal received in the form of sequential samples |
| EP0517385A3 (en) * | 1991-06-05 | 1992-12-16 | Salora Oy | A method of doubling the number of lines of a video signal received in the form of sequential samples |
| EP0622953A1 (en) * | 1993-04-22 | 1994-11-02 | Thomson Consumer Electronics, Inc. | Motion adaptive video processing system |
| US5412436A (en) * | 1993-04-22 | 1995-05-02 | Thomson Consumer Electronics, Inc. | Motion adaptive video processing system |
| TR27482A (en) * | 1993-04-22 | 1995-06-07 | Thomson Consumer Electronics | Motion-adapted video processing system. |
| EP0662767A2 (en) * | 1994-01-07 | 1995-07-12 | Texas Instruments Incorporated | Video display system with a digital line deinterlacing circuit |
| EP0662767A3 (en) * | 1994-01-07 | 1995-07-26 | Texas Instruments Incorporated | Video display system with a digital line deinterlacing circuit |
| US5748250A (en) * | 1994-01-07 | 1998-05-05 | Texas Instruments Incorporated | Video display system with digital de-interlacing |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8301156D0 (en) | 1983-02-16 |
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| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |