EP0714580A1 - Flickering-reducing process and circuitry for television sets - Google Patents
Flickering-reducing process and circuitry for television setsInfo
- Publication number
- EP0714580A1 EP0714580A1 EP94925397A EP94925397A EP0714580A1 EP 0714580 A1 EP0714580 A1 EP 0714580A1 EP 94925397 A EP94925397 A EP 94925397A EP 94925397 A EP94925397 A EP 94925397A EP 0714580 A1 EP0714580 A1 EP 0714580A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- image
- movement
- field
- display sequence
- motion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title abstract description 6
- 238000001514 detection method Methods 0.000 claims description 11
- 230000015654 memory Effects 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- H04N7/0127—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter
- H04N7/0132—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter the field or frame frequency of the incoming video signal being multiplied by a positive integer, e.g. for flicker reduction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S348/00—Television
- Y10S348/91—Flicker reduction
Definitions
- the invention relates to a method for a television set for reducing the flicker, in which a movement of the content of an image to be processed is determined by a device for motion detection and a first flicker-reduced image reproduction sequence is carried out when no motion is detected and a second flicker-reduced and motion-responsive image reproduction sequence is performed when motion is detected.
- the invention also relates to a circuit arrangement for performing the method.
- TV sets work according to the interlaced method.
- a full image is processed and displayed in the form of two fields, which are displayed one after the other in time.
- Flickering edge flickering or large surface flickering occurs on the one hand with fine structures and on the other hand with areal structures.
- a first such method consists in displaying the fields (A, B) of a full image in immediate succession and then repeating them again (ABAB).
- the speed of presentation is twice that of conventional ones. With this method, the frequencies of both the large-area and edge flicker are doubled, so that there is a flicker reduction due to the inertia of the human eye.
- one field is repeated immediately (AABB).
- the field sequence is correct in the movement phase here.
- a movement-correct image reproduction is thus possible.
- the frequency of the large-area flicker is doubled, but the frequency of the edge flicker remains unchanged.
- the object of the invention is therefore to provide a method and a circuit arrangement of the type in question which can be implemented with little circuit complexity and have a sufficiently flicker-reduced and, if possible, correct movement of the image.
- the device for motion detection for a multiplicity of parts of the image to be processed comprising a number of connected pixels determines whether there is movement of the content of each part and a movement event for each part a signal is displayed that the motion events are counted by a counting device, that the number of motion events is compared with a threshold value, that when the threshold value is undershot, the first image display sequence is carried out and that when the threshold value is exceeded, the second image display sequence is carried out.
- circuit arrangement comprising - a device for motion detection which has an input for a video signal and an output for a signal which indicates that for a large number of a movement of a number of contiguous pixels comprising parts of an image to be processed can be determined,
- a counting device which has an input connected to the device for motion detection and in which the counter reading is changed in the event of a motion event
- a comparison device which has an input connected to the counting device and is compared with a threshold value in the counter reading of the counting device
- a control device connected to the comparison device for switching from a first flicker-reduced image display sequence to a second flicker-reduced and movement-correct image display sequence.
- the method can be implemented both as a software solution by a microprocessor and in terms of hardware in accordance with the circuit arrangement.
- a motion detector is usually included in television sets, for example for performing noise reduction methods. This motion detector can also be used at the same time for the method according to the invention or the circuit arrangement. Compared to the known arrangement, the motion detector can be designed to be less complex, since it only detects the presence of a movement, but not the speed of movement.
- the signal control for the flicker-reduced and the movement-correct image reproduction sequence can be carried out using already existing components. Accordingly, the method and the circuit arrangement according to the invention can be implemented with standard components.
- 1 shows a block diagram of the image signal processing and 2 shows a realization of the motion-dependent switching control of the image signal processing.
- the color-coded video signal with the luminance component Y and the chrominance components U, V is fed to the image signal processing stage of a television set.
- This color-coded video signal is generated in the television set, for example, from a video signal CVBS in the baseband by a color decoder.
- the video signal in the baseband can in turn be obtained from an antenna signal by means of a tuner and an intermediate frequency and demodulation stage.
- the image signal components of the color-coded video signal Y, U, V are digitally converted in an analog-digital converter device 1.
- One image processor 2, 3 each prepares a field.
- Common functions are, for example, noise reduction, image format adaptation and conversion, and the generation of effects such as picture-in-picture or information superimposition (on-screen display).
- the information of one field is present at the output of the image processors 2, 3.
- the fields are temporarily stored with their luminance and chrominance information in a field memory 4 and 5, respectively.
- the control signals for the correct reading in and reading out of the field memories 4, 5 are each provided by a memory control device 6 or 7.
- a synchronization signal generator 8 which separates the synchronization signal compartments from the analog video signal CVBS and processes them for further processing in the converter device 1 and the control devices 6, 7 at the correct time.
- the field memories 4, 5 are connected on the output side to a digital-to-analog converter device 9, which forwards the now processed video signal components Y ', U', V to a video output stage of the television set. The video output stage uses this to generate signals that can be used to control a picture tube.
- a device 10 is provided with which the field reproduction sequence is switched over as a function of the movement of the image content.
- the device 10 is supplied with the digitally converted image signals by the converter 1 as well as line and image-coupled synchronized information from the synchronizing signal generating device 8.
- the device 10 generates control signals for the memory controls 6, 7 and the image processing processors 2, 3.
- a switch is made from a first flicker-reduced field reproduction sequence to a second flicker-reduced and movement-correct field reproduction sequence.
- the ABAB display sequence is provided as the first field display sequence, one frame consisting of the two fields A, B. As mentioned at the beginning, the ABAB sequence effectively reduces edge and large-area flicker.
- the second field display sequence AABB is used for motion-intensive image contents. This playback sequence is characterized by a movement-oriented display, since the field sequence corresponds to the natural movement phase. The large area flicker is reduced in the sequence AABB, while the edge flicker remains unaffected.
- the time period for the reproduction of a field is 10 ms, so that 40 ms are required for one frame.
- the playback frequency for one field is 100 Hz. While field A contains the odd-numbered lines, field B contains the even-numbered lines. As a result, the fields A, B are shown offset on a screen at the corresponding positions a and b. The switchover is fully synchronized.
- the decision which of the field repetitions is used for the image display in the television set is made by the device 10. 2 contains a motion detector 20, by means of which output signal is displayed whether movement occurs in a certain image area.
- the number of movement events is counted in a counting device 21, for example a block-wise evaluation.
- the counting result is evaluated image-coupled.
- the counting process is reset, for example, field by frame or frame by frame or for a sequence of fields and / or frames.
- the corresponding reset signal and the counter clock are derived from the image-synchronous control signals of the synchronizing signal generating device 8.
- the counter reading of the counter 21 is compared with a threshold value in a comparison device 22.
- a switching between the field display sequence ABAB to AABB and vice versa then takes place in a control device 23.
- Trigger signals for the memory control devices 6, 7 are then present at the outputs of the switching device 23, with which the fields stored in the field memories 4, 5 are read out in a time-controlled manner in accordance with the set field reproduction sequence.
- the comparison device 22 has a hysteresis. This means switching from the sequence ABAB to AABB takes place at a first threshold, and switching in the opposite direction at a second threshold. If an up counter is used for the counter 21, the first threshold is higher than the second.
- a motion detector evaluates, for example, the motion of the content of a part of a field or full frame with regard to a number of pixels lying next to one another. For this purpose, the difference in brightness from the same pixels of successive fields or frames can be evaluated. In addition, the speed of movement could also be taken into account by determining the shift in the same image content between successive fields or frames become. When threshold values for the change in brightness or the magnitude of the shift are exceeded, a movement event is detected for the pixel region under consideration and is displayed at the output of the movement detector 20.
- a section of a line, that is to say in the horizontal direction, and additionally the corresponding area of adjacent lines, that is to say in the vertical direction, can be evaluated as the pixel region to be evaluated with a number of connected pixels.
- this evaluation is carried out for a large number of sections of a field or full image that are defined in this way.
- the number of movement events counted by the counter 21, for example per field, represents a measure of the movement of the image content.
- the decision threshold values of the comparison device 22 for switching between the playback sequence ABAB to AABB and vice versa are to be selected in adaptation to the human eye, so that subjectively reduced flicker, but correct movement of the image results on the screen of the television set.
- This threshold can be permanently set by the manufacturer.
- a variable definition of the threshold values is also conceivable, for example controlled by a microprocessor, wherein an adaptation to noise properties of the video signal and other properties of the video signal source can also be carried out.
- the device 10 can be implemented in part or in total, but in particular in the case of the devices 21, 22, 23, by software control of a microprocessor.
- a microprocessor is usually present anyway for controlling the signal processing in the device.
- Dedicated hardware solutions are already known for the motion detector 20.
- a motion detector is implemented, for example, in the SDA 9290 component from Siemens with one of the image processing devices 2, 3 together as an integrated circuit. The output signal of the motion detector can then be used both for Control of the image signal processing in the devices 2, 3 and also for controlling the switching of the field sequence in device 10 can be used simultaneously.
- a circuit arrangement according to the invention can thus be implemented using commercially available components, that is to say without designing further complex integrated circuits. Integrated circuits are also already available for other function blocks shown in FIG. Specifically, these are the device SDA 9205-2 for device 1, device SDA 9257 for device 8, device SDA 9220 for devices 6, 7 and device SDA 9280 for device 9, all of the above Manufacturer.
- a field comparison for motion detection is carried out, for example, using the motion detector of the SDA 9290 and a corresponding evaluation logic.
- the result has only 2 logical states (movement eg "0"; no / little movement eg "1").
- This signal is offered to a control computer (microprocessor, microcontroller) of a digital television set on an I / O port.
- the deflection grid ⁇ ßß to ⁇ ß ⁇ ß
- the control computer continues to be offered a frame sync pulse on an I / O port.
- Switching the display and deflection mode of the digital deflection process can now be carried out by the control computer via the I 2 C bus in full frame synchronism. It is advantageous to provide a time hysteresis for the transition from AABB to ABAB.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4327779A DE4327779C1 (en) | 1993-08-18 | 1993-08-18 | Method and circuit arrangement for a television set for the purpose of reducing flicker |
DE4327779 | 1993-08-18 | ||
PCT/EP1994/002469 WO1995005717A1 (en) | 1993-08-18 | 1994-07-26 | Flickering-reducing process and circuitry for television sets |
US08/603,932 US5708480A (en) | 1993-08-18 | 1996-02-20 | Method and circuit configuration for reducing flicker in a television set |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0714580A1 true EP0714580A1 (en) | 1996-06-05 |
Family
ID=27205465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94925397A Ceased EP0714580A1 (en) | 1993-08-18 | 1994-07-26 | Flickering-reducing process and circuitry for television sets |
Country Status (5)
Country | Link |
---|---|
US (1) | US5708480A (en) |
EP (1) | EP0714580A1 (en) |
JP (1) | JPH09501806A (en) |
DE (1) | DE4327779C1 (en) |
WO (1) | WO1995005717A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4427017C1 (en) * | 1994-07-29 | 1995-08-17 | Siemens Ag | Converting TV signals into output for display |
JP2947186B2 (en) * | 1996-10-23 | 1999-09-13 | 日本電気株式会社 | Flicker reduction circuit |
US5894330A (en) * | 1997-01-23 | 1999-04-13 | Silicon Integrated Systems Corp. | Adaptive anti-flicker method for VGA to TV data conversion |
SE511733C2 (en) * | 1997-04-04 | 1999-11-15 | Limt Technology Ab | Noise reduction method and apparatus |
US6535254B1 (en) | 1997-10-31 | 2003-03-18 | Pinnacle Systems Inc. | Method and device for noise reduction |
US6909466B1 (en) | 1998-09-30 | 2005-06-21 | Micronas Gmbh | Circuit for frame rate conversion using a motion-adaptive method |
US6766098B1 (en) * | 1999-12-30 | 2004-07-20 | Koninklijke Philip Electronics N.V. | Method and apparatus for detecting fast motion scenes |
US6898327B1 (en) | 2000-03-23 | 2005-05-24 | International Business Machines Corporation | Anti-flicker system for multi-plane graphics |
US6959118B2 (en) * | 2001-03-26 | 2005-10-25 | Dynapel Systems, Inc. | Method and system for the estimation and compensation of brightness changes for optical flow calculations |
US7360932B2 (en) * | 2004-06-01 | 2008-04-22 | Donnelly Corporation | Mirror assembly for vehicle |
WO2010004468A1 (en) * | 2008-07-11 | 2010-01-14 | Nxp B.V. | Reducing de-interlacing artifacts |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4272787A (en) * | 1978-09-07 | 1981-06-09 | Micro Consultants Limited | T.V. Picture freeze system |
GB2045574B (en) * | 1979-03-22 | 1983-04-20 | Quantel Ltd | Video movement detection |
NL8100603A (en) * | 1981-02-09 | 1982-09-01 | Philips Nv | GRID FREQUENCY DOUBLE CIRCUIT FOR A TELEVISION SIGNAL. |
DE3307687C3 (en) * | 1983-03-04 | 1994-04-28 | Broadcast Television Syst | System for reducing noise in a television signal |
US4652907A (en) * | 1985-03-25 | 1987-03-24 | Rca Corporation | Apparatus for adaptively controlling a video signal recursive filter |
US4779131A (en) * | 1985-07-26 | 1988-10-18 | Sony Corporation | Apparatus for detecting television image movement |
GB8519319D0 (en) * | 1985-07-31 | 1985-09-04 | Shell Int Research | Catalyst |
US4700365A (en) * | 1985-10-25 | 1987-10-13 | Rca Corporation | Digital threshold detector with hysteresis |
US4661853A (en) * | 1985-11-01 | 1987-04-28 | Rca Corporation | Interfield image motion detector for video signals |
DE3809249A1 (en) * | 1988-03-18 | 1989-09-28 | Thomson Brandt Gmbh | MOTION DETECTOR |
DE3814570A1 (en) * | 1988-04-29 | 1989-11-09 | Grundig Emv | METHOD AND CIRCUIT ARRANGEMENT FOR FLIMER REDUCTION IN A TELEVISION RECEIVER |
DE3839437A1 (en) * | 1988-11-23 | 1990-05-31 | Grundig Emv | CIRCUIT ARRANGEMENT FOR CHANGING BETWEEN DIFFERENT FLAME REDUCTION METHODS IN A TELEVISION RECEIVER |
FR2644956B1 (en) * | 1989-03-23 | 1991-06-07 | Europ Rech Electr Lab | FRAME FREQUENCY CONVERSION DEVICE FOR A HIGH DEFINITION TELEVISION RECEIVER AND METHOD FOR DETECTING MOTION IN A CODED TELEVISION IMAGE |
JP2861249B2 (en) * | 1989-05-11 | 1999-02-24 | 日本電気株式会社 | Image change detection method and image change detection device |
FR2651948B1 (en) * | 1989-09-08 | 1995-07-28 | Europ Rech Electr Lab | METHOD FOR DETECTION OF WEFT FREQUENCY MOVEMENT AND NUMBER OF DESIRED LINES AND DEVICE FOR IMPLEMENTING SAME. |
DE4015437A1 (en) * | 1990-05-14 | 1991-11-21 | Philips Patentverwaltung | CIRCUIT ARRANGEMENT FOR REDUCING THE LINE AND EDGE FLICKER IN TELEVISION IMAGES AND SIGNAL PROCESSING CIRCUIT TO THEREFORE |
US5325203A (en) * | 1992-04-16 | 1994-06-28 | Sony Corporation | Adaptively controlled noise reduction device for producing a continuous output |
DE4327733C1 (en) * | 1993-08-18 | 1994-06-01 | Grundig Emv | Video signal picture movement detector - generates movement bits for each full image from signals produced due to difference between pixels of luminance half images |
-
1993
- 1993-08-18 DE DE4327779A patent/DE4327779C1/en not_active Expired - Lifetime
-
1994
- 1994-07-26 WO PCT/EP1994/002469 patent/WO1995005717A1/en not_active Application Discontinuation
- 1994-07-26 JP JP7506702A patent/JPH09501806A/en active Pending
- 1994-07-26 EP EP94925397A patent/EP0714580A1/en not_active Ceased
-
1996
- 1996-02-20 US US08/603,932 patent/US5708480A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9505717A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5708480A (en) | 1998-01-13 |
DE4327779C1 (en) | 1994-12-08 |
WO1995005717A1 (en) | 1995-02-23 |
JPH09501806A (en) | 1997-02-18 |
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