Including Chrominance Signal Amplitude Control Patents (Class 348/644)
  • Patent number: 9495936
    Abstract: Images to be projected onto a projection surface are modified prior to projection based on color values sampled from the projection surface. A camera samples color values from the projection surface and a processor generates a modified source image based at least in part on pixel color values in an original source image and the color values sampled from the projection surface. A projector then projects the modified source image onto the projection surface.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: November 15, 2016
    Assignee: Amazon Technologies, Inc.
    Inventor: Skeets Jonathan Norquist
  • Patent number: 8243201
    Abstract: The invention relates to a method and module for regulating saturation degree. In this method, a curvature of a special function in all position is regulated by a saturation parameter to obtain a regulated function. A color input signal is assigned as an independent variable of the regulated function to calculate a color output signal corresponding to the color input signal.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: August 14, 2012
    Assignee: ASUSTek Computer Inc.
    Inventor: Chi-Yi Tsai
  • Patent number: 8159616
    Abstract: The present invention relates to a method and corresponding system for improving the perceived visual quality of images for instance displayed on a color television screen. According to the invention, there is provided a means for carrying out histogram processing (13) for scaling an input video signal (6) such that the maximum dynamic range is utilised and where the quality of the perceived image is also optimised. According to the invention, the histogram processing (13) provides a transfer function for the image pixels to obtain enhanced image dynamics and also to provide a chrominance gain (gc) for scaling the chrominance components, when the luminance has been changed by the histogram processing. According to the invention, the histogram processing can also take variations of the ambient light into account (5).
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: April 17, 2012
    Assignee: Bang & Olufsen A/S
    Inventor: Lars Nørgaard
  • Patent number: 8081260
    Abstract: There is provided a color killer circuit comprising a burst amplitude detection unit that detects an amplitude of a color burst; a delay unit that stores, delays, by a predetermined period of time, and outputs the detected amplitude; a subtractor that calculates a difference between an output from the burst amplitude detection unit and an output from the delay unit; a first comparator that compares the output from the burst amplitude detection unit with a first threshold value to determine whether or not the output from the burst amplitude detection unit is less than the first threshold value; and a second comparator that compares an output from the subtractor with a second threshold value to determine whether or not the output from the subtractor is greater than the second threshold value, wherein the color killer circuit masks the color component of the composite video signal when the first comparator determines that the output from the burst amplitude detection unit is less than the first threshold value,
    Type: Grant
    Filed: October 10, 2008
    Date of Patent: December 20, 2011
    Assignees: Sanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
    Inventors: Chikara Sakyo, Hiroyuki Ebinuma
  • Patent number: 8031269
    Abstract: In the chroma killer detection for detecting the abnormality of the burst signal, in addition to the circuits (1004, 1005, 1006) for detecting the states of the components of the burst signal, which circuits are for selecting the cos ? data of the burst signal, circuits (1050, 1051, 1052) for detecting the states of the R-Y components, which circuits are for selecting sin ? data are employed for chroma killer detection. Thereby, it is possible to enhance the detection precision of the abnormality states of the burst signal and the precision for discrimination of the broadcasting system.
    Type: Grant
    Filed: September 19, 2006
    Date of Patent: October 4, 2011
    Assignee: Panasonic Corporation
    Inventors: Kazuya Miyashita, Toshihiro Matsumura
  • Patent number: 8018533
    Abstract: A method and system for adjusting selected colors of an image is presented. A chrominance adjustment system in accordance with one embodiment of the present invention, determines whether the color of the current pixel is near a selected color. When the color of the current pixel is near the selected color the chrominance adjustment system calculates a color specific chrominance adjustment factor based on the current color and the selected color and adjusts the color of the current pixel using the color specific chrominance adjustment factor.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: September 13, 2011
    Assignee: Huaya Microelectronics, Ltd
    Inventor: Ge Zhu
  • Patent number: 7724308
    Abstract: A cross color suppressing apparatus used for suppressing the cross color of a frame is provided. The frame has several pixels, and the image data of each pixel include a luminance and a chrominance. The apparatus includes a diagonal edge detector, a cross color detector and a chrominance suppressing unit. The diagonal edge detector is used for determining whether target pixel is on a diagonal edge according to the luminance of the target pixel and that of its neighboring pixels. The cross color detector is used for determining whether the chrominance of the target pixel is substantially different from that of its neighboring pixels. If both the determination results of the diagonal edge detector and the cross color detector are true, the chrominance suppressing unit suppresses the chrominance of the target pixel and its neighboring pixels.
    Type: Grant
    Filed: January 11, 2006
    Date of Patent: May 25, 2010
    Assignee: Himax Technologies Limited
    Inventor: Fung-Jane Chang
  • Publication number: 20090096928
    Abstract: There is provided a color killer circuit comprising a burst amplitude detection unit that detects an amplitude of a color burst; a delay unit that stores, delays, by a predetermined period of time, and outputs the detected amplitude; a subtractor that calculates a difference between an output from the burst amplitude detection unit and an output from the delay unit; a first comparator that compares the output from the burst amplitude detection unit with a first threshold value to determine whether or not the output from the burst amplitude detection unit is less than the first threshold value; and a second comparator that compares an output from the subtractor with a second threshold value to determine whether or not the output from the subtractor is greater than the second threshold value, wherein the color killer circuit masks the color component of the composite video signal when the first comparator determines that the output from the burst amplitude detection unit is less than the first threshold value,
    Type: Application
    Filed: October 10, 2008
    Publication date: April 16, 2009
    Applicants: SANYO ELECTRIC CO., LTD., SANYO SEMICONDUCTOR CO., LTD.
    Inventors: Chikara Sakyo, Hiroyuki Ebinuma
  • Patent number: 7250985
    Abstract: A color demodulation circuit that can complement an unstable state of an output from an ACC circuit and can obtain stable color-difference outputs, regardless of a burst signal in a chrominance carrier signal. Normally, a selector connects an output from a first multiplier that controls an amplitude of an output from a band-pass filter using an output from the ACC circuit, to a color-difference output demodulation circuit. However, during a period in which there are abrupt changes in the burst signal, for example during a period in which the output from the ACC circuit becomes unstable such as at switching between a state including a burst and a state not including a burst, the selector connects an output from a second multiplier that controls the amplitude of the output from the band-pass filter using an ACC output monitor signal, to the color-difference demodulation circuit.
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: July 31, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuya Miyashita, Toshihiro Matsumura
  • Patent number: 7075589
    Abstract: A conventional method to determine an onset point of a color killer function by design of the external circuit requires physical work to change external parts and their component values varying from one model to another. Therefore, an alternative method to adjust the onset point of the color killer function without requiring such work has been sought for. This invention offers a color killer adjustment device, which adjusts the onset point of the color killer function to switch off the color signal in video signals, having a CPU to store and output a control signal to determine the onset point of the color killer function, a color killer control circuit which generates the reference voltage corresponding to the control signal from the CPU and a comparator which compares a signal representing the level of the color burst signal in the color signal with the reference voltage and outputs a signal to disable the color signal in the video signals according to a result of the comparison.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: July 11, 2006
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Keijiro Ueki
  • Patent number: 7046305
    Abstract: Method and apparatus for automatically enhancing the foliage display of a color signal includes providing the color signal in multiplexed form having alternating first and second components, the first component being substantially aligned with a flesh tone color space axis, the second component being substantialy aligned with a green tone color space axis. A de-multiplexing unit separates the first and second components to provide a first de-multiplexed component substantially aligned with the flesh tone axis and a second de-multiplexed component substantially aligned with the green tone axis.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: May 16, 2006
    Assignee: Thomson Licensing
    Inventors: Rick Wayne Miller, Eric Stephen Carlsgaard, Karl Francis Horlander
  • Patent number: 6987541
    Abstract: A video signal processing circuit. includes: a bell table, a first switch, a carrier generating unit, a second switch and a calculation processing unit. The bell table inputs a color difference signal to output a modulation signal having an amplitude defined by the SECAM Standard of the color difference signal. The first switch selects one of the color difference signal and the modulation signal to output a first signal. The carrier generating unit inputs the color difference signal to generate a carrier signal having a frequency defined by the SECAM Standard of the color difference signal. The second switch selects one of the carrier signal and a carrier signal having frequency defined by the PAL Standard and/or the NTSC Standard to output a second signal. The calculation processing unit calculates the first and second signals to output a color difference modulation signal.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: January 17, 2006
    Assignee: NEC Electronics Corporation
    Inventor: Yoshikazu Komatsu
  • Publication number: 20040051814
    Abstract: A conventional method to determine an onset point of a color killer function by design of the external circuit requires physical work to change external parts and their component values varying from one model to another. Therefore, an alternative method to adjust the onset point of the color killer function without requiring such work has been sought for. This invention offers a color killer adjustment device, which adjusts the onset point of the color killer function to switch off the color signal in video signals, having a CPU to store and output a control signal to determine the onset point of the color killer function, a color killer control circuit which generates the reference voltage corresponding to the control signal from the CPU and a comparator which compares a signal representing the level of the color burst signal in the color signal with the reference voltage and outputs a signal to disable the color signal in the video signals according to a result of the comparison.
    Type: Application
    Filed: July 14, 2003
    Publication date: March 18, 2004
    Inventor: Keijiro Ueki
  • Patent number: 6201578
    Abstract: An apparatus for processing television signal including an A/D converter which converts a television signal (a luminance signal) into a digital television signal. A sampling circuit samples television signal data outputted from the A/D converter in response to a sampling clock outputted from a VCO included in a PLL, and outputs sampled data. An output of the A/D converter is also applied to a band elimination filter which outputs luminance signal data that a chrominance signal component is completely eliminated. The sampled data and the luminance signal data are compared with each other by a comparator, and an output of the comparator is applied to a low-pass filter included in the PLL during a burst period. An output of the low-pass filter becomes a control voltage signal for the VCO, whereby an oscillation frequency (phase) of the VCO is controlled.
    Type: Grant
    Filed: November 29, 1996
    Date of Patent: March 13, 2001
    Assignee: Sanyo Electric Co., Ltd.
    Inventor: Nobukazu Hosoya
  • Patent number: 5982975
    Abstract: A video signal copying apparatus for copying a signal recorded on a recording medium onto other recording media is provided.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: November 9, 1999
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sang-wook Kim
  • Patent number: 5715006
    Abstract: A motion compensated predicting device compensates motion by segmenting a reference image to generate an initial predicted image and estimated value correcting information. The correcting information includes area segmentation information, motion information of each area, information of each pixel not assigned with an estimated value, and information of each pixel assigned with several estimated values. An estimated value correcting device references the initial predicted image and the estimated value correcting information to decide the value of the pixel for which a unique estimated value is missing in the initial predicted image so as to finally produce a motion compensation predicted image. Through interpolation, motion vectors are decided for a portion for which estimated values cannot be uniquely determined, and hence the contour of the overall area is kept remained and distortion of area boundaries is minimized.
    Type: Grant
    Filed: September 19, 1994
    Date of Patent: February 3, 1998
    Assignee: NEC Corporation
    Inventor: Yutaka Yokoyama
  • Patent number: 5671021
    Abstract: A color image monitoring apparatus is capable of controlling the color correction characteristics by external commands. A color correction information memory stores input masking coefficients and .gamma. correction tables. The input masking coefficients can be loaded in the memory by an external command. In the .gamma. correction tables includes a table for the correction values for the .gamma. values at pitches of 0.1 within a range of 1.0 to .alpha. (>1.0). When a .gamma. correction process is executed, the tables to be used are selected by specifying the .gamma. values by the external command. A color correction circuit performs the respective .gamma. correction and input masking processes using the .gamma. correction tables and input masking coefficients stored in the memory.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: September 23, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuichi Kumada, Toshihisa Okutsu
  • Patent number: 5661530
    Abstract: A television circuit (10) according to the invention includes a multiplier (12), and a voltage signal (V1) is outputted from an LPF (22) in accordance with the presence or absence of a color burst signal which is to be inputted to the multiplier (12). A rectangular-wave signal (Va) is obtained on the basis of the voltage signal (V1) through a peak holding circuit (24) and a sampling/holding circuit (42). A rectangular-wave signal (Vc) is obtained by averaging the rectangular-wave signal (Va) and a rectangular-wave signal (Vb) which is obtained by delaying the signal (Va) by a 1H delay circuit (44) by an adder (46) and a 1/2 multiplication circuit (48). On the basis of the rectangular-wave signal (Vc), a voltage signal (V3) is produced by an LPF (52) having a relatively small time constant, which is compared with a reference voltage (Vref) by a level-comparator (54), whereby a signal is outputted. The signal is used as a color killer signal for a color killer circuit, for example.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: August 26, 1997
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Fumiaki Honda, Nobukazu Hosoya
  • Patent number: 5654769
    Abstract: An automatic color control and chroma killer circuit 3 and video processing system is provided that is capable of controlling an amplitude of a color signal and of performing a killer function with a simple construction without using a divider and/or vertical filter. The ACC/ACK device includes ACC and ACK circuitry which may be selectively enabled with operating signals to a selector 27. When the selector 27 enables amplitude detector 25, the amplitude detector 25 detects amplitude of the input color signal and a coefficient controller 26 compares it with a killer level. If the input color signal fails to meet the killer level then the coefficient controller 26 controls a coefficient generated by the coefficient generator 22 to perform a killer operation. The ACC operation and circuitry is thereby ACK controlled until an input color signal meets or exceeds the killer level.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 5, 1997
    Assignee: Texas Instruments Incorporated
    Inventors: Kazuhiro Ohara, Masafumi Yugami
  • Patent number: 5627599
    Abstract: A chrominance signal processing apparatus for a digital television receiver, comprising an A/D converter for converting a transmitted analog composite video signal into a digital signal in response to a clock frequency, a luminance/chrominance separation circuit for separating luminance and chrominance signals from an output signal from the A/D converter, a delay circuit for delaying the separated luminance signal for a predetermined time period, an ACC circuit for controlling an amplitude of the separated chrominance signal, a chrominance demodulator for detecting color difference signals from an output signal from the ACC circuit, a color killer circuit for detecting a maximum amplitude value of a color burst signal from the separated chrominance signal to generate a color killer signal, a first multiplexing circuit for selecting one of the output signal from the A/D converter and an output signal from the delay circuit in response to the color killer signal, a second multiplexing circuit for selecting the
    Type: Grant
    Filed: October 24, 1995
    Date of Patent: May 6, 1997
    Assignee: LG Electronics Inc.
    Inventor: Sung-Hoon Hong
  • Patent number: 5532829
    Abstract: A control circuit includes: a capacitor for normal reproduction which stores an output of a reproduction color burst level detection for automatic color signal level control in a color signal processing circuit at the time of normal reproduction in a video cassette recorder; a capacitor for special reproduction which stores an output of a reproduction color burst level detection for automatic color signal level control at the time of special reproduction in the video cassette recorder; a switch for changing-over between outputs of the capacitors to supply a selected output to a gain variable amplifier for color signal amplification; and applying circuit for applying a voltage of the capacitor for special reproduction to the capacitor for normal reproduction at the time of special reproduction.
    Type: Grant
    Filed: March 29, 1995
    Date of Patent: July 2, 1996
    Assignee: Rohm Co., Ltd.
    Inventor: Yasunori Kawamura
  • Patent number: 5452016
    Abstract: An automatic color control and chroma killer circuit 3 and video processing system is provided that is capable of controlling an amplitude of a color signal and of performing a killer function with a simple construction without using a divider and/or vertical filter. The ACC/ACK device includes ACC and ACK circuitry which may be selectively enabled with operating signals to a selector 27. When the selector 27 enables amplitude detector 25, the amplitude detector 25 detects amplitude of the input color signal and a coefficient controller 26 compares it with a killer level. If the input color signal fails to meet the killer level then the coefficient controller 26 controls a coefficient generated by the coefficient generator 22 to perform a killer operation. The ACC operation and circuitry is thereby ACK controlled until an input color signal meets or exceeds the killer level.
    Type: Grant
    Filed: March 10, 1993
    Date of Patent: September 19, 1995
    Assignee: Texas Instruments
    Inventors: Kazuhiro Ohara, Masafumi Yugami
  • Patent number: 5389979
    Abstract: An improved chrominance signal playback system and method for a video cassette recorder are disclosed. A radio frequency of composite video signal detected by a video head is applied to a low-pass filter which filters the composite video signal and outputs a low frequency of chrominance signal. The chrominance signal from the low-pass filter is automatically gain-controlled and is demodulated. The demodulated chrominance signal is applied to a color killer circuit. Also, an envelope detector detects an envelope signal from the chrominance signal from the low-pass filter. In response to the envelope signal, an attenuator attenuates the level of the chrominance signal from the color killer circuit. This results in the suppression of white noise in the chrominance signal. Therefore, the signal-to-noise ratio and the accompanying image quality can be enhanced.
    Type: Grant
    Filed: May 13, 1992
    Date of Patent: February 14, 1995
    Assignee: Gold Star Co., Ltd.
    Inventor: Dong K. Jeong