WO2002001851A1 - Dynamic control of scanning velocity modulation - Google Patents
Dynamic control of scanning velocity modulation Download PDFInfo
- Publication number
- WO2002001851A1 WO2002001851A1 PCT/US2001/019798 US0119798W WO0201851A1 WO 2002001851 A1 WO2002001851 A1 WO 2002001851A1 US 0119798 W US0119798 W US 0119798W WO 0201851 A1 WO0201851 A1 WO 0201851A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- image
- svm
- display
- ypip
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
- H04N3/32—Velocity varied in dependence upon picture information
Definitions
- This invention relates to image enhancement systems and more particularly to the dynamic control of image enhancement during multiple image display.
- the sharpness of a displayed picture can be enhanced by peaking certain spatial frequencies of the displayed signal and, or, by modulating the scanning velocity of the display electron beam.
- spatial frequency peaking is performed by a circuit arrangement which changes the amplitudes of certain spatial frequencies without altering their relative phase relationships. Such peaking can be achieved with a cosine equalizer or transversal filter.
- scanning velocity modulation a derivative of the luminance portion of the display signal is employed to vary the velocity of the scanning beam. Slowing the scanning beam causes a greater number of electrons to land at a particular point in the displayed image causing a brightening of the display at that particular image location. Conversely, accelerating the scanning velocity at a particular point in the displayed image results in a darkening of the display.
- multimedia monitors provide the ability to display images from multiple sources, such as, conventional NTSC, high definition television as defined by the Advanced Television System Committee (ATSC) standards as well as various computer image formats.
- This array of display signal sources represent a range of differing scanning frequencies and spatial frequency content.
- high definition television has more lines and greater spatial frequency content, and thus is sharper than a conventional NTSC signal.
- this range of display signal formats introduces significant display complexity in, for example, the areas of multifrequency time base generation and synchronization, high voltage generation, and sharpness or image enhancement.
- display image sharpness is controlled in a video display apparatus operable to display first and second images simultaneously.
- the method comprises the steps of; combining the first and second images to form a simultaneous display; and independently controlling the sharpness in accordance with each of said first and second images combined to form the simultaneous display.
- display image sharpness is dynamically controlled in accordance with the sources of the displayed images forming the simultaneous display.
- display image sharpness is dynamically controlled in accordance with the spectral frequency content of the sources forming the simultaneous display.
- FIGURE 1A depicts a simultaneous display of multiple pictures having a picture in picture arrangement.
- FIGURE 1B depicts a simultaneous display of multiple pictures having a picture out of picture, side by side arrangement.
- FIGURE 2 is a block diagram showing an inventive display signal processing arrangement to form a simultaneous display with video peaking and scanning beam velocity modulation.
- FIGURE 3A is a diagram depicting the variation of a peaking with input signal amplitude in a typical enhancement arrangement.
- FIGURE 3B is a diagram depicting the variation of a peaking with input signal amplitude in an inventive enhancement arrangement.
- FIGURE 4 is a block diagram showing an inventive dynamically controlled video peaking arrangement.
- FIGURES 5A, B and C show impulse and amplitude frequency responses for the inventive dynamically controlled video peaking arrangement of FIGURE 4.
- FIGURE 6 is a schematic diagram of an scanning velocity modulation arrangement with dynamic control of SVM signal amplitude.
- FIGURE 1A depicts an exemplary wide screen display apparatus, for example having a 16:9 aspect ratio, and showing a simultaneous display of two input picture sources having a picture in picture arrangement.
- the generation of a picture in picture or PIP arrangement is well known.
- a picture in picture is formed by effectively cutting a hole in the main picture, which in exemplary FIGURE 1A is St George slaying a dragon.
- the hole is then filled with a significantly smaller picture, for example the dogs.
- the switching signal is shown adjacent to the vertical and horizontal edges of FIGURE 1A, in actuality the switching signal PIP/POP FSW or fast switch is only present for part of the vertical scan, as indicated by the indicator Vpos, which determines the vertical location.
- the small image forming the PIP may be generated by a variety of well known methods, for example by so called electronic speed up where the image is time compressed horizontally by reading from a memory at a rate higher than its writing speed.
- the image width may also be reduced by deleting and or interpolating groups of pixels.
- various combinations of deletion, interpolation and speedup can be employed.
- the vertical inserted picture dimension may be reduced by deleting or interpolating groups of lines to achieve the desired inserted picture height.
- the spatial frequency content of the inserted picture or PIP will be significantly altered. For example, if electronic speed up is used to reduce the PIP image width by an exemplary 80%, i.e.
- the PIP is to occupy 1/5 of the screen width, the resulting spatial frequency content of the minified image will have been up converted by five times.
- an ATSC picture source with a modest horizontal resolution of 25 MHz will result in a PIP image with spectral frequency components of 125 MHz.
- frequency components can be generated, processed and coupled for display, it is doubtful that in such an up-converted image the phase relationships would be maintained to yield a smaller image with the same scene detail as the original picture.
- high speed processing may be precluded by cost considerations.
- the display screen structure, phosphor dot pitch, display viewing distance and human visual acuity will also contribute to diminished detail in the PIP image.
- FIGURE 1B depicts an exemplary wide screen display apparatus showing a special implementation of picture out of picture or POP, where pictures of comparable size are presented side by side. Such side by side presentation allows direct image comparison with any resolution differences being quite apparent. Thus there is a requirement that the apparent sharpness of the two images be sufficiently similar, which by implication suggests that the two halves be similarly processed to yield comparable alterations in the picture detail.
- the height must be changed in proportion to the width.
- the individual picture width may be altered by cropping and discarding the edges of each image. For example, in FIGURE 1B the left and right edges of each image have been removed such that the combined POP width fills the screen. Thus strips of one quarter the picture width are removed from each edge of each picture.
- the individual picture height remains unchanged however, thus although no geometrical image distortion has resulted, the image aspect ratio has been altered from an exemplary 16:9 to 8:9.
- FIGURES 1A and 1B a horizontal broken line is shown dissecting the screen picture, and as described previously a switching signal PIP/POP fast switch is shown illustrating the timed, or positional occurrence of the alternate picture material.
- an inventive arrangement employs a combination of the exemplary fast switching signal and other signals indicative of display signal origin to dynamically control the displayed image enhancement in each picture part by control of either or both video signal peaking and scanning beam velocity modulation.
- FIGURE 2 is a block diagram showing a display signal processing arrangement for the simultaneous display of at least two image sources with an advantageous dynamic control of video peaking and scanning beam velocity modulation specific to the image content of the display.
- the number of different input signal sources for example ATSC, NTSC, computer (SVGA), DVD and VHS when combined with the possible simultaneous image displays of PIP, POP and side by side presentations can be optimally enhanced by use of multiple, for example 5, differing levels of enhancement at for example two selectable peaking frequencies.
- specific image content may be beneficially enhanced by use of simultaneous peaking at both frequencies but with different contributions at each frequency, individually controlled to provide specific enhancement effects.
- signal sources for display are input to the display apparatus via an input selection arrangement 100, which for example, may include tuners for NTSC and ATSC radio frequency signal reception, and or base band signal input from sources such as VCR, DVD, camera, computer, video games etc.
- input selector 100 includes digital video processing which performs picture size manipulation as required by user selection for example, PIP, PIP position and or size, POP position or side by side display.
- controller 150 Associated with input signal source selector 100 is controller 150 which facilitates input or display signal selection and provides control and timing waveforms throughout the display apparatus. In particular controller 150 generates fast switching signals for PIP/POP insertion, and on screen display, OSD, messages and insertion signal OSD FSW.
- the signal selector 100 is shown with output signals Y main and Y PIP which are coupled to block 200 where they are combined to form a simultaneous display signal.
- the minified PIP, or POP image is inserted into the main signal responsive to the timing, or position, of the PIP fast switch signal relative to the main luminance signal synchronization.
- video frequency peaking is implemented in the main signal path prior PIP signal insertion.
- the combined main and PIP or POP Y image signal is coupled to an advantageous dynamically controlled video peaking circuit depicted as block 300 which can change peaking amounts during active picture time.
- the choice of input signal for advantageous dynamically controlled video peaking in no way effects the dynamic operation of the video peaking arrangement.
- the peaked luminance signal 301 with the PIP or POP image combined is coupled for on screen display, OSD, message insertion in block 400.
- an OSD fast switch signal is used to position the insertion point of the on screen message.
- the OSD fast switch signal can blank or reduce the signal amplitude of the main signal being overwritten by the OSD message.
- controller 150 which generates the OSD fast switch signal, controls the transparent OSD insertion and provides an additional dynamic control element to control signals CtrU and Ctrl2 coupled to transversal filter 300.
- the peaked luminance signal 401 is coupled to a video processor block 500 where display drive signals are formed.
- display drive signals are formed.
- the image display signals are coupled to an exemplary cathode ray tube for display and further enhancement by modulation of the scanning beam velocity by an SVM coil located on the CRT neck responsive to high frequency components or the derivative of the luminance signal.
- a scanning beam velocity modulation signal is formed from the luminance component of the display signal and is suitably processed to generate a current which is coupled to the SVM coil to perturb the scanning speed of the horizontal component of the deflection field.
- the SVM signal may be generated from a luminance component Y" formed prior to, or following luminance signal enhancement however, it is known to inhibit SVM enhancement during OSD and simultaneous image display. In FIGURE 2 however, the SVM signal is generated from a luminance component signal Y' within video processing block 500 subsequent to PIP and OSD insertion.
- SVM enhancement may be varied by dynamic control of the SVM signal amplitude.
- the SVM amplitude may be advantageously reduced by 6dB during the main picture with the SVM signal amplitude increased, or a 6dB reduction dynamically removed for the duration of the PIP image insert.
- FIGURE 3A is a diagram depicting the variation of video peaking or sharpening with input signal amplitude in a typical enhancement arrangement.
- FIGURE 3B depicts an exemplary variation of a peaking amplitude, or sharpness effect, with input signal amplitude in an inventive arrangement.
- various different signal sources are considered with a corresponding sharpness or enhancement characteristic.
- an HDTV or ATSC signal source may contain spectral signal components in the range of 30 MHz hence image sharpening can be performed as in curve 1 to enhance a band or range of frequencies in excess of the usual image frequencies contained in an NTSC signal.
- the ATSC curve is depicted with the lowest degree of image enhancement or sharpening.
- an NTSC signal source may be subjectively improved by significantly greater amounts of peaking, as depicted in curve 2, applied over a lower band of frequencies and possibly occurring at a lower video signal level.
- a PIP image is small and significantly reduced in sharpness, hence may benefit subjectively by enhancement of the signal components remaining in the minified picture part.
- Curve 3 depicts an empirically determined level of PIP image enhancement which provides a subjective improvement in sharpness if applied with a greater amplitude over a range of frequencies different from those selected for either NTSC or ATSC picture enhancement.
- Curve 4 depicts levels of enhancement which can be employed to sharpen an up converted NTSC signal source when presented as a PIP display.
- FIGURE 4 The block diagram shown in FIGURE 4 is illustrative of a peaking arrangement or transversal filter which can be implemented in analog form for use with base band video signals, analog delay lines and analog multipliers. Similarly a digital configuration may be used with digital representation of the video signals, digital shift registers and adders or multipliers. The function and control are substantially the same for either analog or digital circuit implementation.
- the transversal filter may, in simple terms, be considered to function as a peaking arrangement where the main signal SM is combined with inverted and attenuated time shifted versions of the input.
- the main signal SM is considered to be an impulse, it is augmented by leading and trailing echoes of the impulse, spaced in time by the duration of the delay paths.
- the summation of inverted, attenuated and time shifted versions of the input signal may be thought of as contributing pre and post lobes to increase the perceived sharpness by reducing the apparent rise time of the impulse signal.
- FIGURES 5A, 5B and 5C illustrate the effect of the summation of the inverted pairs of echoes in both time and frequency domains.
- the transversal filter depicted in FIGURE 4 provides dynamically controlled peaking in two bands of frequencies with an amount of overlap or additional enhancement occurring in the overlapping band between the individual peaking frequencies.
- the bands over lap or that the number of bands be limited to two.
- delay elements D1 -D4 each have the same delay value, for example 74 nano seconds, which represents the period of an ITU 601 sampled signal.
- maximum enhancement with signal HFpk occurs at approximately 13.5 MHz due to delay elements D3 and D4.
- the lower frequency enhancement signal LFpk peaks at 6.75 MHz due to the additive effect of D1 plus D3 and D2 plus D4.
- a delay value of 37 nano seconds will produce a high frequency correction peak at 27 MHz with a lower frequency peak at 13.5 MHz.
- the use of transversal filters with selectable multiple frequency bands is well known.
- a video and deflection processing integrated circuit for example Toshiba type TA1276N provides six different peaking frequencies which are selectably controlled via a serial data bus as typified by the l 2 C bus.
- the peaking frequency may be selected via the bus, simultaneous operation at two or more frequencies is not facilitated.
- the limited transmission speed of the l 2 C data bus for example 400 Kb/s permits only static filter selection and user sharpness control manipulation.
- Such l 2 C data bus control precludes the dynamic control of peaking amount or frequency selection required to facilitate selective enhancement of the individual picture parts comprising a simultaneous PIP or POP image.
- a digital filter implementation with delay elements provided by clocked devices more readily permits the construction of multifrequency filters than with analog signals and delay lines.
- an analog or digital video signal is input at terminal A and is coupled to delay element D1 and via an inverter and attenuator, not shown, to provide an input signal with an amplitude of minus one quarter that of the input signal at summing device SUM Lf.
- the delayed main signal, HfE is coupled to a second summing device SUM Hf and to a second delay element D3.
- Signal HfE is coupled via an inverter and attenuator, not shown, to provide an input signal with an amplitude of minus one quarter that of the input signal at summing device SUM Hf.
- the output signal SM from delay element D3 is coupled to delay element D4 and to summer SUM O/P where enhancement signals HFpk and LFpk are added to form a peaked luminance output signal Yenh.
- the output from delay D3 is attenuated, for example by one half, and coupled to summers Hf and Lf where respective correction signals Hf Cor and Lf cor are formed.
- From delay element D4 an output signal HfL is coupled as a third input to summing device SUM Hf, via an inverter and attenuator, not shown.
- Output signal HfL is also coupled to delay D2 which produces an output signal LfL for coupling through an inverter and attenuator, to form the third input to summing device SUM Lf.
- the output signals HfCor and LfCor from respective summers SUM Hf, and SUM Lf are each coupled to respective control devices CTHfpk and CTLfpk which are advantageously individually, dynamically controlled in amplitude by respective control signals Ctrll and Ctrl2.
- the dynamic control signals are generated by controller 150 in response to the selected video image source, which is indicative of likely spatial frequency content, and the type of display presentation, i.e. normal, PIP or side by side.
- an ATSC image signal may be enhanced by the addition of only amplitude controlled higher frequency signal components as represented by signal Hfpk.
- an NTSC signal may be optimally enhanced with the addition of lower frequency signal components Lfpk.
- PIP image content may require enhancement in both low and high frequency bands with an maximum enhancement occurring between the low and high frequency peaks, as illustrated in FIGURE 5C by the dashed curve annotated 2 Pk Freq.
- An up converted image derived from an exemplary NTSC source although subject to a nominal 2:1 spatial frequency translation, is still significantly less sharp particularly when displayed side by side with an ATSC or computer generated image. Consequently the up converted image is enhanced in both low and high frequency bands to improve perceived sharpness and lessen visible differences.
- Controller 150 generates the advantageous dynamic control signals Ctrll and Ctrl2 which are coupled to provide independent control of the high frequency and low frequency multipliers Hfpk, Lfpk respectively.
- the fast switch signal determines the inserted location of the minified image, hence it can be used to advantageously control the degree of enhancement, and the frequency band or bands in which the spectral components of the PIP image will be enhanced. Selection between peaking frequency bands is achieved by means of the control signals Ctrll and Ctrl2, which, for example, when either is set for zero enhancement results in zero peaking at that peaking frequency.
- the fast switch signal can be represented by a digital word or words which change value in synchronism with the fast switch signal.
- controller 150 provides independent control of enhancement at each peaking frequency, certain simultaneous images may be optimally enhanced by dynamically and independently controlling the peaking frequency and enhancement amount.
- significant enhancement changes can occur which can potentially result in undesirable transitional peaking effects.
- Advantageously such undesirable peaking transitions are avoided by controlling the rate, or number of clock periods over which the control words assume the new value.
- the fast switch signal would be filtered to produce a gradual, ramping change in enhancement effect at the PIP boundary.
- FIGURE 6 is a detailed circuit diagram showing an exemplary scanning velocity modulation (SVM) amplifier with advantageous dynamic control of SVM signal amplitude responsive to a digital control word for example Ctrll /Ctrl2.
- SVM scanning velocity modulation
- the apparent sharpness of multiple image portions, displayed simultaneously on a single screen can be optimized by dynamically controlling the degree of signal peaking or enhancement applied to each part of the displayed picture.
- scanning velocity modulation for image enhancement is achieved by the SVM system within a limited range of input signal amplitudes in order to produce a sustained, maximized level of enhancement.
- the sustained SVM signal amplitude is usually controlled by peak to peak SVM signal limiting and often includes a negative feedback loop which samples the coil driver amplifier current to prevent excessive power dissipation.
- the SVM signal is derived from the enhanced simultaneous display signal hence an advantageous feed forward signal is employed to dynamically control SVM signal amplitude. Because the SVM amplitude is dynamically controlled prior to peak to peak limiting, for example in differential amplifier 601 or diode clipper 602, the subsequent drive circuitry is thereby prevented from sustained or continuous peak to peak clipping of the SVM signal which consequentially diminishes or degrades image enhancement.
- digital control bits are coupled to dynamically control the amplitude of the SVM signal applied to the SVM coil to optimize edge enhancement of the individual multiple image portions.
- controller 150 generates a digital control word in response to the signal source selected for display together with the nature of the displayed image, for example, PIP, side by side or POP.
- the digital control word may for example comprise 3 bits and as depicted in FIGURE 6 be used to dynamically control the SVM signal amplitude and hence the degree of SVM derived image enhancement.
- a luminance signal, Y is coupled via capacitor C1 to the base electrode of transistor Q2, which is configured as an emitter follower.
- this luminance input signal may be derived as signal Y" from video processor 500 or as signal Y" formed in processing block 200.
- Resistors R10, R11 and R12 form a potential divider connected between power supply, +VA, and ground for determining the base voltages of transistors Q2 and Q4.
- the collector of transistor Q2 is connected to power supply, +VA, typically 24 volts, and the emitter is coupled via resistor R13 to the emitter electrode of a grounded base amplifier formed by transistor Q4.
- the base electrode of transistor 4 is connected to the junction of resistors R11 and R12 and is decoupled ground by capacitor C2.
- the amplified luminance signal at the collector of transistor Q4 is differentiated by a parallel connected network formed by capacitor C5, inductor L2 and damping resistor R19 connected between the transistor collector and ground.
- the differentiated luminance or SVM signal formed at the collector of transistor 4 is coupled via capacitor C3 and resistor R20 to the base of transistor Q6 which together with transistor Q8 form differential amplifier 601.
- a resistor R21 is coupled to the junction of capacitor C3 and resistor R20 to bias the base of transistor Q6 to the same potential as that of transistor Q8.
- the gain of the differential amplifier is set by resistors R26 and R28, R36 and the collector current from current source transistor 7.
- Resistors R25, R33 and R34 form a potential divider that provides biasing voltages for transistors Q6, Q7, and Q8, where transistor Q6 is biased via resistors R20 and R21 and transistor Q8 is biased via resistor R30.
- the junction of resistors R21, R30, R33 and R34 is decoupled to ground by capacitor C14.
- capacitor C11 decouples the junction of resistors R25 and R33 to ground.
- the collector electrode of 6 is directly connected to supply voltage +VA.
- the differential amplifier 601 formed by transistors Q6 and Q8 provides an amplified, amplitude controlled and peak to peak limited signal across resistor R36 at the collector of transistor Q8.
- Peak to peak limiting can also be provided by an AC coupled reverse poled diode pair arrangement shown in 602 which allows peak to peak SVM signal limiting to be independent of amplifier gain and power supply considerations associated with amplifier 601.
- the SVM signal from the collector of transistor Q8 is coupled to a power amplifier (SVM DRIVER) which generates a current in the SVM coil to affect modulation of the scanning velocity of the horizontal component of the CRT scanning electron beam.
- SVM DRIVER power amplifier
- Block 650 shows the formation of an SVM control word from control signals Ctrll and Ctrl2 which can be combined and coupled to an exemplary digital to analog converter for example, as depicted within dashed boxes A and B.
- the digital to analog converter shown in box A includes transistor switches Q.1 , Q3, Q5. Each transistor switch is driven to saturated conduction by a positive logic level, for example, +5 volts which corresponds to a logical 1 state. When anyone of the transistor switches is saturated an AC potential divider is formed at the base of transistor Q6 by the series combination of ones of transistor switches, Q1 , Q3, Q5 respectively, collector load resistors R1A, R2A and R3A, DC blocking capacitor C4 and resistor R20.
- the transistor switches are turned off and no AC potential division occurs at the input of differential amplifier 601. In this way a digital control word is converted to an analog signal attenuation value which determines the SVM signal amplitude and hence the degree of picture sharpening.
- an SVM control word can be formed from control signals Ctrll and Ctrl2 for example by block 650, and coupled to a digital to analog converter, for example, as depicted by transistor switches 1 , Q3, Q5.
- Each transistor can generate a current amplitude in proportion to respective collector resistors R1B, R2B and R3B. These digitally determined currents are summed to form current I.
- the data bits have a zero volt, or logical zero value, a maximum current I is conducted from 5 volt positive supply (+). With data bits having a value of nominally 5 volts or logical 1 , the transistor switches are turned off and no digitally controlled currents are generated from positive supply (+).
- the digitally derived currents forming current I are coupled to the junction of resistor R27 and the emitter of current source transistor Q7.
- the other end of resistor R27 is connected to ground.
- the collector of transistor Q7 is coupled to the junction of resistors R26 and R28 which determine the gain in the differential amplifier.
- the variation of source current in the differential amplifier provides dynamic control the gain or amplitude of the SVM signal.
- the SVM signal amplitude and resulting enhancement is dynamically controlled in response to digital values derived for each picture part of the displayed image.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
- Controls And Circuits For Display Device (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Picture Signal Circuits (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/312,482 US20040056982A1 (en) | 2001-06-21 | 2001-06-21 | Dynamic control of scanning velocity modulaton |
HU0301135A HUP0301135A3 (en) | 2000-06-23 | 2001-06-21 | Method and equipment for dynamic controlling scanning velocity modulation |
AU2001270028A AU2001270028A1 (en) | 2000-06-23 | 2001-06-21 | Dynamic control of scanning velocity modulation |
JP2002505497A JP2004502349A (en) | 2000-06-23 | 2001-06-21 | Dynamic control of scanning speed modulation |
EP01948557A EP1293091A1 (en) | 2000-06-23 | 2001-06-21 | Dynamic control of scanning velocity modulation |
MXPA02012700A MXPA02012700A (en) | 2000-06-23 | 2001-06-21 | Dynamic control of scanning velocity modulation. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21375500P | 2000-06-23 | 2000-06-23 | |
US60/213,755 | 2000-06-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002001851A1 true WO2002001851A1 (en) | 2002-01-03 |
Family
ID=22796374
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/019798 WO2002001851A1 (en) | 2000-06-23 | 2001-06-21 | Dynamic control of scanning velocity modulation |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1293091A1 (en) |
JP (1) | JP2004502349A (en) |
KR (1) | KR20030009547A (en) |
CN (1) | CN1214619C (en) |
AU (1) | AU2001270028A1 (en) |
CZ (1) | CZ20024185A3 (en) |
HU (1) | HUP0301135A3 (en) |
MX (1) | MXPA02012700A (en) |
TR (1) | TR200202688T2 (en) |
WO (1) | WO2002001851A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014155618A1 (en) * | 2013-03-28 | 2014-10-02 | Necディスプレイソリューションズ株式会社 | Image quality improving device, image display device and image quality improving method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0469567A2 (en) * | 1990-08-02 | 1992-02-05 | Thomson Consumer Electronics, Inc. | Beam scan velocity modulation apparatus with disabling circuit |
EP0784402A2 (en) * | 1996-01-10 | 1997-07-16 | Matsushita Electric Industrial Co., Ltd. | Television receiver |
US5815216A (en) * | 1995-09-14 | 1998-09-29 | Samsung Electronics Co., Ltd. | Display device capable of displaying external signals and information data using a double-picture type screen |
EP1056278A1 (en) * | 1999-05-26 | 2000-11-29 | Thomson Licensing S.A. | Video signal processing arrangement for scan velocity modulation circuit |
-
2001
- 2001-06-21 WO PCT/US2001/019798 patent/WO2002001851A1/en active Application Filing
- 2001-06-21 HU HU0301135A patent/HUP0301135A3/en unknown
- 2001-06-21 EP EP01948557A patent/EP1293091A1/en not_active Withdrawn
- 2001-06-21 MX MXPA02012700A patent/MXPA02012700A/en active IP Right Grant
- 2001-06-21 CZ CZ20024185A patent/CZ20024185A3/en unknown
- 2001-06-21 CN CNB018142761A patent/CN1214619C/en not_active Expired - Fee Related
- 2001-06-21 KR KR1020027017539A patent/KR20030009547A/en not_active Application Discontinuation
- 2001-06-21 JP JP2002505497A patent/JP2004502349A/en not_active Withdrawn
- 2001-06-21 AU AU2001270028A patent/AU2001270028A1/en not_active Abandoned
- 2001-06-21 TR TR2002/02688T patent/TR200202688T2/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0469567A2 (en) * | 1990-08-02 | 1992-02-05 | Thomson Consumer Electronics, Inc. | Beam scan velocity modulation apparatus with disabling circuit |
US5815216A (en) * | 1995-09-14 | 1998-09-29 | Samsung Electronics Co., Ltd. | Display device capable of displaying external signals and information data using a double-picture type screen |
EP0784402A2 (en) * | 1996-01-10 | 1997-07-16 | Matsushita Electric Industrial Co., Ltd. | Television receiver |
EP1056278A1 (en) * | 1999-05-26 | 2000-11-29 | Thomson Licensing S.A. | Video signal processing arrangement for scan velocity modulation circuit |
Also Published As
Publication number | Publication date |
---|---|
CN1448020A (en) | 2003-10-08 |
CN1214619C (en) | 2005-08-10 |
EP1293091A1 (en) | 2003-03-19 |
AU2001270028A1 (en) | 2002-01-08 |
JP2004502349A (en) | 2004-01-22 |
KR20030009547A (en) | 2003-01-29 |
CZ20024185A3 (en) | 2003-04-16 |
HUP0301135A3 (en) | 2003-12-29 |
MXPA02012700A (en) | 2003-04-25 |
HUP0301135A2 (en) | 2003-08-28 |
TR200202688T2 (en) | 2003-03-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5534934A (en) | Television receiver capable of enlarging and compressing image | |
US6771319B2 (en) | Method and apparatus for simultaneously displaying both moving and still pictures on a display | |
CA2047898C (en) | Beam scan velocity modulation apparatus with disabling circuit | |
CA1233235A (en) | Interpolated progressive-scan television arrangement | |
US20040056982A1 (en) | Dynamic control of scanning velocity modulaton | |
EP1168836A2 (en) | Dynamic control of image enhancement | |
WO2002001851A1 (en) | Dynamic control of scanning velocity modulation | |
US4333105A (en) | Beam-indexing color television receiver | |
JP3584362B2 (en) | Video signal processing device | |
US4916538A (en) | Apparatus and methods for enhancing a video display | |
KR100759294B1 (en) | Video display apparatus including scanning beam velocity modulation at multiple scanning frequencies, and method for controlling scanning velocity modulation thereof | |
US4573081A (en) | Frequency selective video signal compression | |
JP3191322B2 (en) | Aspect ratio conversion display device | |
JP2847754B2 (en) | Television receiver | |
JP3287833B2 (en) | Blooming reduction circuit of color television receiver | |
JPH04139965A (en) | Television receiver | |
JP3045128B2 (en) | Display device | |
JPH1093842A (en) | Tv signal processing circuit | |
JP2640027B2 (en) | High-definition TV receiver | |
JP2000115582A (en) | Sharpness enhancing circuit, receiver and video signal processing method | |
JPH05260502A (en) | Video signal processing circuit | |
JPH05207389A (en) | Video apparatus | |
JPS58710B2 (en) | Ghost Shingoyokuatsusouchi | |
JP2002330313A (en) | Image quality enhancing device at 4:3 aspect ratio | |
JPH05347722A (en) | Contour correcting circuit for television receiver |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2001948557 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: PA/a/2002/012700 Country of ref document: MX |
|
WWE | Wipo information: entry into national phase |
Ref document number: PV2002-4185 Country of ref document: CZ |
|
ENP | Entry into the national phase |
Ref document number: 2002 505497 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2002/02688 Country of ref document: TR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020027017539 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 1020027017539 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 018142761 Country of ref document: CN |
|
WWP | Wipo information: published in national office |
Ref document number: 2001948557 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10312482 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: PV2002-4185 Country of ref document: CZ |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |