Vertical Transition Patents (Class 348/628)
  • Patent number: 9737717
    Abstract: An example of a neurostimulation system may include a storage device, a programming control circuit, and a graphical user interface (GUI). The storage device may be configured to store individually definable waveforms. The programming control circuit may be configured to generate stimulation parameters controlling the delivery of the neurostimulation pulses according to a pattern. The GUI may be configured to define the pattern using one or more waveforms selected from the individually definable waveforms. The GUI may display waveform tags each selectable for access to a waveform of the individually definable waveforms, and display a waveform builder in response to selection of one of the waveform tags. The waveform builder may present a graphical representation of the accessed waveform and allow for the accessed waveform to be adjusted by editing the graphical representation of the accessed waveform on the GUI.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: August 22, 2017
    Assignee: Boston Scientific Neuromodulation Corporation
    Inventors: Michael A. Moffitt, Sridhar Kothandaraman
  • Patent number: 9726521
    Abstract: A signal processing apparatus comprising: a first gain-adjustable amplifier receiving the first input signal and generating a first output signal according to a gain; a first magnitude detector receiving the first output signal and generating a first magnitude signal; a first adder for subtracting the first magnitude signal from a reference value, thereby generating a first sampling signal; and a first weighting integrator receiving the first input signal, the second input signal and the first sampling signal, and generating the first integrated signal to control the gain of the first gain-adjustable amplifier.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: August 8, 2017
    Assignee: RDC SEMICONDUCTOR CO., LTD.
    Inventor: Ming-CHou Yen
  • Patent number: 9719808
    Abstract: A signal processing apparatus receiving a first input signal and the first input signal being directly used as a first output signal. The signal processing apparatus comprising: a first gain-adjustable amplifier receiving the first input signal and generating a gain-adjusted first input signal according to a gain; a first adder for subtracting the gain-adjusted first input signal from the second input signal, thereby generating a second output signal; and a weighting correlator receiving the first output signal and the second output signal, and generating the first integrated signal to control the gain.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: August 1, 2017
    Assignee: RDC SEMICONDUCTOR CO., LTD.
    Inventor: Ming-Chou Yen
  • Patent number: 9714847
    Abstract: A signal processing apparatus comprising: a first gain-adjustable amplifier receiving the first input signal and generating a gain-adjusted first input signal according to a first gain; a first adder for subtracting the gain-adjusted first input signal from the second input signal, thereby generating a second output signal; a second gain-adjustable amplifier receiving the second input signal and generating a gain-adjusted second input signal according to a second gain; a second adder for subtracting the gain-adjusted second input signal from the first input signal, thereby generating a first output signal; and a weighting correlator receiving the first output signal and the second output signal, and generating the first integrated signal to control the first gain and the second gain.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: July 25, 2017
    Assignee: RDC SEMICONDUCTOR CO., LTD.
    Inventor: Ming-Chou Yen
  • Patent number: 9129393
    Abstract: An embodiment relates to a method and an image processor for reducing chroma noise in digital-image data. An embodiment performs noise reduction in the color-filter-array domain prior to demosaicing in order to prevent spreading of noise in subsequent stages of the image-processing pipeline. Peaks in the CFA data are attenuated in order to prevent any undesired color cast. Specifically, any correction to a certain pixel is made in accordance with the amplitude of digital gains applied, as well as with the local luminance and the contribution of the current color channel to the local luminance. In this manner, corrections are restricted to image areas that are subject to high digital amplification, that are comparatively dark, and that are not dominated by the current color channel.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: September 8, 2015
    Assignee: STMircoelectronics S.r.l.
    Inventors: Angelo Bosco, Davide Giacalone, Arcangelo Ranieri Bruna
  • Patent number: 8879002
    Abstract: A system and method for enhancing the detail edges and transitions in an input video signal. This enhancement may be accomplished by enhancing small detail edges before up-scaling and enhancing large amplitude transitions after up-scaling. For example, detail edge enhancement (detail EE) may be used to enhance the fine details of an input video signal. An edge map may be used to prevent enhancing the large edges and accompanying mosquito noise with the detail enhancement. Noise may additionally be removed from the signal. After the fine details are enhanced, the signal may be up-scaled. Luminance transition improvement (LTI) or chrominance transition improvement (CTI) may be used to enhance the large transitions of the input video signal post scaler.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: November 4, 2014
    Assignee: Marvell World Trade Ltd.
    Inventors: Shilpi Sahu, Nikhil Balram, Sanjay Garg
  • Patent number: 8797462
    Abstract: A band processing circuit which generates image signals corresponding to different frequency bands from an image signal in which signals corresponding to different colors are arranged and which suppresses noise by synthesizing the image signals of the different frequency bands, a sampling circuit which generates image signal corresponding to the colors by sampling the image signal input from the band processing circuit in accordance with a predetermined arrangement, and a luminance/color generation circuit which generates a luminance signal in which aliasing is suppressed using an image signal output from the sampling circuit.
    Type: Grant
    Filed: February 10, 2011
    Date of Patent: August 5, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shinya Hirai
  • Patent number: 8692938
    Abstract: There is provided a video processing device capable of reducing the influence of a disturbance of an input vertical synchronization signal. When the synchronization signal detecting unit detects an input of the input-side vertical synchronization signal at a predetermined cycle, the synchronization signal control unit outputs the input-side vertical synchronization signal, which has been input, as an output-side vertical synchronization signal, and, when the synchronization signal detecting unit detects an input of a next input-side vertical synchronization signal before the predetermined cycle elapses after the output of the output-side vertical synchronization signal, a next input-side vertical synchronization signal input before the predetermined cycle elapses is not output as a next output-side vertical synchronization signal, and an input-side vertical synchronization signal input further next is output as the next output-side vertical synchronization signal.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: April 8, 2014
    Assignee: Panasonic Corporation
    Inventor: Takashi Kuwabara
  • Patent number: 8325273
    Abstract: Methods and systems for processing video information are disclosed herein and may comprise calculating at least one vertical gradient of a plurality of adjacent pixels within a current field. A two-field difference may be calculated between a plurality of pixels within a first field and a corresponding plurality of pixels within a second field. At least one pixel may be deinterlaced within the current field based at least in part on the calculated at least one vertical gradient and the calculated two-field difference. The two-field difference may indicate an amount of motion between the plurality of pixels within the first field and the corresponding plurality of pixels within the second field. Phase shifting may be applied to at least one of the plurality of pixels within the first field and the corresponding plurality of pixels within the second field to effect in-phase alignment.
    Type: Grant
    Filed: November 10, 2005
    Date of Patent: December 4, 2012
    Assignee: Broadcom Corporation
    Inventor: Alexander MacInnis
  • Patent number: 8264615
    Abstract: A system and method for enhancing the detail edges and transitions in an input video signal. This enhancement may be accomplished by enhancing small detail edges before up-scaling and enhancing large amplitude transitions after up-scaling. For example, detail edge enhancement (detail EE) may be used to enhance the fine details of an input video signal. An edge map may be used to prevent enhancing the large edges and accompanying mosquito noise with the detail enhancement. Noise may additionally be removed from the signal. After the fine details are enhanced, the signal may be up-scaled. Luminance transition improvement (LTI) or chrominance transition improvement (CTI) may be used to enhance the large transitions of the input video signal post scaler.
    Type: Grant
    Filed: June 2, 2009
    Date of Patent: September 11, 2012
    Assignee: Marvell World Trade Ltd.
    Inventors: Shilpi Sahu, Nikhil Balram, Sanjay Garg
  • Patent number: 8184204
    Abstract: In a de-ring system for reducing the overshooting and undershooting of a video signal after scaling on the horizontal and the vertical direction in a scaler, a region judgment device receives the video signal and detects the attributes of the region in the video signal. When the region in the video signal is an edge and flat area, the de-ring system adjusts the weighting coefficient to increase the low frequency components for reducing the overshooting and undershooting of the video signal. When the region in the video signal is neither an edge nor an edge and flat area, the de-ring system adjusts the weighting coefficient to increase the high frequency components for preserving the high frequency components of the video signal, so as to dramatically reduce the overshooting and undershooting of a video signal.
    Type: Grant
    Filed: January 12, 2010
    Date of Patent: May 22, 2012
    Assignee: Sunplus Technology Co., Ltd
    Inventor: Chian-Wen Chen
  • Patent number: 8149337
    Abstract: According to one embodiment, a video processing apparatus includes an input module and a video processor. The input module is configured to input a video signal. The video processor is configured to apply sharpening processing to pixels in a horizontal direction and pixels in a vertical direction, which are included in the video signal, and to apply image blur correction to the pixels in the horizontal direction and the pixels in the vertical direction based on an imaging model function.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: April 3, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yasuhiko Muto
  • Patent number: 8035746
    Abstract: The present invention relates to a method for time base correction during generation of a digital video signal from an analog input video signal, and to an apparatus having means for digitizing an analog input video signal using such method. According to the invention, the method includes the steps of: receiving an analog video signal; generating a digital video signal from the analog video signal with a video decoder; storing at least a part of the digital video signal in a memory; detecting a portion of corrupt data having an abnormal field ordering in the digital video signal; either discarding the portion of corrupt data or replacing at least a part of the portion of corrupt data with previous data stored in the memory; and outputting the digital video signal.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: October 11, 2011
    Assignee: Thomson Licensing
    Inventors: Li Bin Cai, Boon Keng Teng
  • Patent number: 7916784
    Abstract: Certain aspects of a method and system for inverse telecine and field pairing may comprise receiving a plurality of fields of alternating polarity. A current field may be weaved with its corresponding adjacent field of opposite polarity. A polarity change count value may be calculated based on the weaving of the current field with its corresponding adjacent field of opposite polarity. The method may determine whether to utilize a progressive scheme or an interlaced scheme to encode the received plurality of fields of alternating polarity based at least in part on the calculated polarity change count value. At least one of a top field first (TFF) scheme, a bottom field first (BFF) scheme, a top field first-repeat first field (TFF-RFF) scheme and a bottom field first-repeat first field (BFF-RFF) scheme may be chosen to pair the plurality of fields of alternating polarity.
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: March 29, 2011
    Assignee: Broadcom Corporation
    Inventors: Alexander MacInnis, Chenhui Feng
  • Patent number: 7221404
    Abstract: To enable a satisfactory suppression of overemphasized component after converting the number of scanning lines of video signal, when the video signal is converted in the number of scanning lines and a high-frequency component at least in a vertical direction of the converted video signal is emphasized, signals delayed by a plurality of stages of time equal to or more than a time required for converting the number of scanning lines are obtained by a delay circuit 18, and an appropriate delay signal is selected from among the plurality of delay signals by a selection circuit 19. The selected delay signal is compared with the emphasized video signal in emphasized-component detector circuits 16a, 16b and the overemphasized component is detected. Processing to suppress the emphasis is performed by suppressor circuits 13a, 13b with respect to a portion where the overemphasized signal component is detected.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: May 22, 2007
    Assignee: Sony Corporation
    Inventors: Seiko Imai, Toshio Sarugaku, Naoki Kaneko, Takaya Hoshino
  • Patent number: 7161636
    Abstract: A vertical sharpness adjustment device with which a viewer of a TV receiver can choose a degree of vertical sharpness adjustment to enhance a contour of a picture in vertical direction is offered. The vertical sharpness adjustment device includes a terminal to which a vertical sharpness control signal given by the viewer is applied, a control circuit to which the vertical sharpness control signal from the terminal is applied and a vertical sharpness adjustment circuit which adjusts the degree of the vertical sharpness of a video signal according to the vertical sharpness control signal from the control circuit.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: January 9, 2007
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Ikuo Osawa
  • Patent number: 7119854
    Abstract: A method is provided for deriving an objective sharpness metric for objectively determining the level of image sharpness of many and unspecific images having different degrees of sharpness. The method for deriving the objective sharpness metric utilizes sub-band frequency information and false edge information for both an original video sequence and a sharpened sequence to be scored.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: October 10, 2006
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Nehal Dantwala
  • Patent number: 7006147
    Abstract: A method (300) of converting interlaced Moving Picture Experts Group (MPEG) video signals to progressive video signals can include receiving an interlaced video signal representing a luma component specifying luma lines and a chroma component specifying chroma lines (310) wherein the chroma component can specify approximately one-half the number of lines of the luma component. The interlaced video signal can be decoded and the number of the chroma lines can be increased to approximately the same as the number of the luma lines (320). The number of chroma lines of the interlaced video signal then can be decreased (340), to substantially reverse the previous increase. The interlaced video signal then can be deinterlaced to produce a progressive video signal (350), which can be processed further (360) as needed.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: February 28, 2006
    Assignee: Thomson Lincensing
    Inventor: Donald Henry Willis
  • Publication number: 20040085481
    Abstract: A vertical sharpness adjustment device with which a viewer of a TV receiver can choose a degree of vertical sharpness adjustment to enhance a contour of a picture in vertical direction is offered. The vertical sharpness adjustment device includes a terminal to which a vertical sharpness control signal given by the viewer is applied, a control circuit to which the vertical sharpness control signal from the terminal is applied and a vertical sharpness adjustment circuit which adjusts the degree of the vertical sharpness of a video signal according to the vertical sharpness control signal from the control circuit.
    Type: Application
    Filed: September 30, 2003
    Publication date: May 6, 2004
    Inventor: Ikuo Osawa
  • Patent number: 6590617
    Abstract: This invention can suppress overshoot/undershoot, and can maintain the improvement effect of the leading edge of an edge portion. For this purpose, a second derivative signal generator (1) generates a second derivative signal (s5) on the basis of time-serially input three successive pixels. A second derivative signal suppression unit (2) generates a signal (s8) obtained by suppressing the second derivative signal, and a signal (s9) indicating the sign of the second derivative signal. The absolute values of the differences between the pixel of interest, and its neighboring pixels are computed, and a smaller one of the absolute values is selected as a signal (s14) by a minimum value selection circuit (18). By multiplying the obtained signals (s8, s9, s14) by a multiplier (19), an edge-emphasizing signal (s15) is generated. The edge-emphasizing signal (s15) is added to the signal of the pixel of interest by an adder (20), thus obtaining an edge-emphasized signal s16.
    Type: Grant
    Filed: February 22, 2000
    Date of Patent: July 8, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Izumi Kanai, Yukio Hiraki, Kohei Inamura
  • Publication number: 20020163595
    Abstract: An interlace motion artifact detector which identifies video image spatial frequencies characteristic of motion artifacts. The detected frequency is the maximum which can be represented by the vertical sampling rate of the video format (i.e., the Nyquist frequency). This frequency is detected by a pair of partial Discrete Fourier Transforms (DFT) which each calculate only the frequency component of interest. Additional vertical frequency components at one half and one quarter the interlace motion artifact frequency are also detected via a partial DFT. The presence of these lower frequencies acts as an indication of an erroneous motion artifact detection. Additionally, the dynamic range and maximum level of the video data is used as an indication of when to boost the frequency detection levels in areas of low brightness and/or contrast.
    Type: Application
    Filed: August 28, 2001
    Publication date: November 7, 2002
    Inventor: Dale R. Adams
  • Patent number: 6424383
    Abstract: An object is to provide a vertical contour correcting device for a video signal which reduces noise without deteriorating effect of the entire contour correction. A vertical contour correcting device (VCP1) which corrects vertical contour components (S1v, S1v′) of a video signal (S1) with a given quantity of correction (K) to enhance the vertical contour (Ev) of the video signal (S1) comprises a vertical contour component extracting device (3) for detecting said vertical contour components (S1v, S1v′) from said video signal (S1), a vertical contour component correlation detector (3, 29, 8c, 8d, 4) for detecting correlation between horizontally adjacent vertical contour components (Sb, Sb′, Sb′′) from said detected vertical contour components (S1v, S1v′), and a controller (5) for determining said quantity of correction (K) on the basis of said detected correlation (Sj1), thereby varying the quantity of correction (K) in accordance with the correlation (Sj1).
    Type: Grant
    Filed: April 22, 1999
    Date of Patent: July 23, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsumi Terai, Naoji Okumura, Yutaka Nio, Kazuhito Tanaka
  • Patent number: 6330038
    Abstract: A method and device for enhancing the sharpness of a video image. The luminance signal portion of a television signal is boosted in its upper frequency range, e.g., between about 2.0 MHz and about 4.25 MHz. This enhancement of the luminance signal accentuates the transitions between the high brightness levels and low brightness levels of the luminance signal. The resulting video image appears much sharper because this quicker transition reduces the amount of signal carrying intermediate brightness information.
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: December 11, 2001
    Assignee: Compaq Computer Corporation
    Inventor: Drew S. Johnson
  • Patent number: 5940141
    Abstract: (1) The analog or digital components (such as RGB, Y/I/Q, Y/U/V, Y/R-Y/B-Y, Y/Cr/Cb, etc.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: August 17, 1999
    Assignee: Yves C. Faroudja
    Inventors: Yves C. Faroudja, Peter D. Swartz
  • Patent number: 5917554
    Abstract: A picture signal processing device for processing picture signals for displaying e.g., an enlarged picture, a contracted picture or a still picture. The picture signal processing device includes a motion detection unit for comparing the picture signal level of a pixel under detection in a first field or a second field together making up a frame, the picture signal levels of pixels lying close to the pixel under detection and the value of a variably set motion detection coefficient to one another for detecting the possible presence of motion in the picture of the pixel under detection. The first field is formed by every two scanning lines and the second field is formed by the remaining scanning lines.
    Type: Grant
    Filed: January 5, 1996
    Date of Patent: June 29, 1999
    Assignee: Sony Corporation
    Inventor: Masashi Ohta
  • Patent number: 5739870
    Abstract: A interpolation engine is disclosed that is capable of generating correction signals for segments of a monitor that form a gradient that eliminates any visual discontinuities between segments on the screen. In one embodiment, a starting count number for a distortion signal is stored in RAM, together with an increment rate signal that indicates the rate of change of the correction signal down the segment. In another embodiment, the increment rate signal is automatically calculated by the device by taking the difference between the starting count numbers for vertically adjacent segments. Since the number of rows in each segment is known and the difference between the starting count numbers of vertically adjacent segments is determined, the amount of correction for each row within a segment is calculated and provided as a correction signal. Hence, a correction signal can be provided for each row of pixels on a screen.
    Type: Grant
    Filed: March 11, 1996
    Date of Patent: April 14, 1998
    Assignee: Display Laboratories, Inc.
    Inventor: Ron C. Simpson
  • Patent number: 5635991
    Abstract: A color signal processing system for a color television receiver which can improve the transition characteristic of a color difference signal, using the transition region of a luminance signal. The system includes a differentiator for differentiating the transition region of an input luminance signal, and a color difference signal processor for processing an input color difference signal by controlling the transition region of the color difference signal in accordance with the differentiated luminance signal. Thus, the transition characteristic of the color difference signal is compensated for in proportion to the transition characteristic of a luminance signal.
    Type: Grant
    Filed: March 3, 1995
    Date of Patent: June 3, 1997
    Assignee: Goldstar Co., Ltd.
    Inventor: Dong H. Kim
  • Patent number: 5581306
    Abstract: A method of improving the sharpness of horizontal edges of an image that has been vertically scaled. The scaled signal, which represents a series of pixel values, is used to derive an aperture correction value (41-46), which is determined by the scaling ratio and an edge factor. This aperture correction value is added to the scaled signal (47), resulting in enhanced pixel values at edges.
    Type: Grant
    Filed: February 8, 1995
    Date of Patent: December 3, 1996
    Assignee: Texas Instruments Incorporated
    Inventor: Kazuhiro Ohara
  • Patent number: 5581305
    Abstract: An automatic picture quality compensating method and apparatus employs a fuzzy theory to entirely analyze three components of brightness and sharpness of the picture image and signal-to-noise ratio in order to achieve an optimal profile compensation of the picture image. The method and system are defined such that the brightness is controlled by using the luminance signal level of the picture image, and the sharpness of the picture quality is controlled by using the vertical correlativity of the luminance signal. In addition, the S/N ratio can be improved by using the envelope of the video signal.
    Type: Grant
    Filed: August 10, 1995
    Date of Patent: December 3, 1996
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Byoung W. Min
  • Patent number: 5561473
    Abstract: A vertical contour correcting circuit that provides contour correction of a luminance signal at a horizontal color transition area of an image, thereby minimizing dot interference at the color transition area of a reproduced image. The vertical contour correcting circuit includes a vertical band-pass filter which outputs a level difference signal. The level difference signal is delayed to produce a first delay signal. The first delay signal is delayed to produce a second delay signal. An intermediate value signal is determined from the level difference signal, the first delay signal, and the second delay signal. The intermediate value signal and the first delay signal are added together so that their carrier color signal band components are canceled out.
    Type: Grant
    Filed: January 18, 1995
    Date of Patent: October 1, 1996
    Assignee: Motorola, Inc.
    Inventors: Osamu Saionji, Masami Aiura
  • Patent number: 5526060
    Abstract: A decoder that provides simultaneous horizontal scanning lines for digital color video, and then band splits each line into high and low frequency signals using low pass filters and subtractors to subtract the low frequency signals from the source video. The high and low frequency signals and the source video for each line is fed to a three tap comb filter, and the high and low frequency signal inputs to the comb filter are also fed to a vertical transition detector that demodulates the high frequency signals, and then provides differences between pairs of lines for luma, chroma magnitude, and chroma phase. The difference signals are used to provide a control signal that automatically switches the comb filter from a three line weighted comb to a two line comb when large vertical transitions are detected in luma, chroma magnitude, or chroma phase.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: June 11, 1996
    Assignee: Raytheon Company
    Inventor: Dean L. Raby
  • Patent number: 5467145
    Abstract: In video signal processing circuitry detail enhancement is done on each of three color channels in response to the detail information, the enhancement of the detail in each color channel being done in reliance on separated high-spatial-frequency information originally contained in one or more of the channels. The high-spatial-frequency information is separated by differentially combining a fullband video signal with that signal as filtered by a cascade connection of vertical lowpass filter and horizontal lowpass filter.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: November 14, 1995
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Allen L. Limberg
  • Patent number: 5446503
    Abstract: In the digital processing of video signals, a vertical detail enhancement system is provided that has a transfer characteristic with a transitional region between a coring region and an active region split into three steps. The slopes of the first, second and third step regions are 25%, 50% and 75% of the enhancement gain, respectively. The levels of enhancement in the step regions are set at 25%, 50% and 75% of the level of enhancement in the active region. A vertical detail signal is compared with a coring level selected by a coring multiplexer among a plurality of hardcoded coring levels to set a coring point at the transfer characteristic. Then, the vertical detail signal is successively compared with the coring level incremented by the selected widths of the step regions to control a step choice unit defining a required attenuation of the vertical detail signal value. A paring level is selected by a paring multiplexer among a plurality of hardcoded paring levels.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: August 29, 1995
    Assignee: Mitsubishi Semiconductor America, Inc.
    Inventor: Patrick Sproule
  • Patent number: 5430499
    Abstract: An apparatus for correcting a vertical aperture of an image generates a vertical aperture correction signal having no line pair component contained therein from a signal read out at every frame from an imaging apparatus using an imaging device of pixel mixing system, the circuit arrangement for realizing the vertical aperture correcting apparatus being such that an original signal, a 2H (H is a horizontal scanning period) delay signal and a 4H delay signal are generated from the imaging device and a sum of the original signal and the 4H delay signal is subtracted from the 2H delay signal to thereby generate a vertical aperture correction signal and also the circuit arrangement being such that luminance signal spectral characteristics are approximated at every horizontal scanning by adjusting a gain of a signal read out from the imaging device.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: July 4, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Kouji Asada, Hiroyasu Ohtsubo, Masaru Noda
  • Patent number: 5384602
    Abstract: To filter a signal delivered in interleaved form, there is provision for the introduction, in series, of a filter on half frames having a bandpass transfer function on the horizontal plane and a high-pass transfer function on the vertical plane. It is shown that this filter then carries out a general bandpass transfer function on the total image signal. Steps are taken to make the center frequency of this filter correspond to a desired resolution of the image. It is shown then that by acting in this way it is possible to heighten the contours of the structures. The invention can be applied particularly to medical radiography.
    Type: Grant
    Filed: June 9, 1993
    Date of Patent: January 24, 1995
    Assignee: GE Medical Systems S.A.
    Inventors: Jean Bossaert, Philippe Bodelet, Thierry Tomietto
  • Patent number: 5363140
    Abstract: A picture signal processing circuit is composed of a picture memory, such as a field memory, having one input port for receiving an input picture signal and two distinct and independent output ports; a timing control circuit is designed to control the respective reading operations through the first and second output ports in such a manner that one output signal is shifted by one horizontal line period with respect to the other output signal, both output signals being supplied to an operating circuit, such as a vertical enhancer, for processing picture signals of a plurality of horizontal lines.
    Type: Grant
    Filed: May 21, 1993
    Date of Patent: November 8, 1994
    Assignee: Sony Corporation
    Inventors: Seiko Isomoto, Toshio Sarugaku, Hiroyuki Kawashima
  • Patent number: 5327228
    Abstract: A system and method for automatically improving the picture quality of television or other video based images, based upon picture content, using improved rule based picture analysis and compensation techniques. The distribution of facial and non-facial tones in a television picture are determined and used to control of picture color quality using neural network techniques. A preferred embodiment of the invention adjusts the brightness, contrast and color saturation of a displayed picture based upon selected portions of the received picture signal. These controls are adjusted every 1/60th of a second (i.e. at the end of each field) to provide an improved visual display. Analysis of the video signal in one field of a frame provides the information for adjusting the picture quality of the subsequent field of that frame.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: July 5, 1994
    Assignee: North American Philips Corporation
    Inventors: Srinagesh Satyanarayana, Sandeep M. Dalal