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| Number | Title | Issue Date |
| 7324162 | Method and apparatus to improve ADC dynamic range in a video decoder A video decoder in which 1) resolution quality can be improved for a given bit count analog-to-digital converter, 2) a lower bit count analog-to-digital converter can be used with substantially similar quality or 3) a combination of improved resolution quality with ... | 01/29/2008 |
| 7233365 | Digital DC restore methods and apparatus Digital dc restore methods and apparatus to restore the DC component of an analog waveform to a quantized reference value level at a given temporal point on a waveform, prior to an ADC. This may used to establish the relationship between the full scale digital value... | 06/19/2007 |
| 7184097 | On-screen display apparatus The present invention provides an on-screen display apparatus which can eliminate variations in the DC level at a time when an input chroma signal and an OSD chroma signal are switched, and prevent an erroneous display of color. The on-screen display apparatus of th... | 02/27/2007 |
| 7176985 | Clamping circuit for video signals An apparatus, system and method for clamping a video signal input to a coupling capacitor (215) for providing a clamping voltage. A charging current is applied to the capacitor (215) via an amplifier (225) having a first input (227) coupl... | 02/13/2007 |
| 7155470 | Variable gain integrator A variable-gain integrator includes a variable-gain multiplier for multiplying digital input data that are input in time sequence by variable gain, an adder for adding output data from the variable multiplier to previous integration data, a clip circuit for limiting... | 12/26/2006 |
| 6965417 | Signal processor An object of the present invention is to provide a signal processor which improves the offset accuracy of a video signal without increasing the number of bits of a circuit. An N-bit adder (103) adds a video signal (S101) and an upper-N-bit signa... | 11/15/2005 |
| 6867817 | Natural luminance transient enhancement A method and apparatus for enhancing an edge transient contained in a video signal include identifying the edge transient and the edge center of the edge transient in the video signal; selecting a side of the edge transient, relative to an edge center thereof, to en... | 03/15/2005 |
| 6833876 | Using a reduced memory look up table for gamma correction through interpolation A method of CRT gamma correction of n-bit color and corresponding device are presented which employ a reduced size lookup table. An n-bit input signal is separated into its m most significant bits and (n−m) least significant bits. Instead of using its full n-bit v... | 12/21/2004 |
| 6750920 | Method and apparatus for adjusting bias and amplitude of a video signal A method and apparatus for adjusting the amplitude and DC bias of a video signal is presented, which may be performed in preparation for analog-to-digital conversion. This is accomplished by first converting a received voltage mode video signal to a current mode vid... | 06/15/2004 |
| 6657619 | Clamping circuit for liquid crystal display device A clamping circuit for supplying a clamped color signal to a gamma-correction circuit is provided with a clamping portion connected to a clamping voltage generating circuit. The clamping voltage generating circuit generates a clamping voltage in response ... | 12/02/2003 |
| 6633343 | Dynamic gamma correction apparatus An appropriate correction quantity is obtained for a video luminance signal on an individual video basis with a characteristic value, like the maximum or average value, of the luminance signal taken into account, thereby performing gray scale correction m... | 10/14/2003 |
| 6580465 | Clamp voltage generating circuit and clamp level adjusting method A low pass filter smooths a voltage corresponding to a least significant bit of a digital image signal outputted from an A/D convertor, and outputs the smoothed voltage to a sample-and-hold circuit. In the sample-and-hold circuit, a sample-hold-pulse is a... | 06/17/2003 |
| 6535255 | Illumination intensity correcting circuit An illumination intensity correcting circuit including a curve fitting circuit formed by differential amplifier circuits and a load resistor, wherein the amplification factor of the curve fitting circuit is changed before and after each breakpoint voltage... | 03/18/2003 |
| 6518998 | Image quality by automatically changing the black level of a video signal A video camera and imaging system having signal processing circuitry configured to change the black level (pedestal) of a video signal in response to comparing an overall system gain (for instance, a gain value and the electronic exposure time of the imag... | 02/11/2003 |
| 6313884 | Gamma correction A gamma correction circuit includes an amplifier (A) coupled to receive an input signal (Vi), and a non-linear impedance (Rg) coupled to the amplifier (A) for determining a gain of the gamma correction circuit in such a manner that the gain increases when... | 11/06/2001 |
| 6304300 | Floating point gamma correction method and system The present invention provides a method, a device, and a system for performing gamma correction on a set of pixel data based on a gamma correction curve table. The gamma correction curve table includes a specified total number of intensity levels associat... | 10/16/2001 |
| 6295098 | Illumination intensity correcting circuit An illumination intensity correcting circuit including a curve fitting circuit formed by differential amplifier circuits and a load resistor, wherein the amplification factor of the curve fitting circuit is changed before and after each breakpoint voltage... | 09/25/2001 |
| 6271891 | Video signal processing circuit providing optimum signal level for inverse gamma correction A video signal processing circuit in which nearly 100% of a largest possible dynamic range can be used, desired contrast is obtained, and desired brightness characteristics are obtained by an increasing in luminance of a screen. The circuit has an RGB amp... | 08/07/2001 |
| 6215529 | Gamma compensation apparatus Aiming to improve color reproducibility of a red part having high color saturation, a gamma compensation apparatus of the present invention is composed of a bending point setting block 100a and a gamma compensation block 101a and bending point setting blo... | 04/10/2001 |
| 6166781 | Non-linear characteristic correction apparatus and method therefor A non-linear response correction apparatus and method reduce look up table size and output error. In one embodiment, a range of an N-bit input signal is split into two or more sectors, based on a gradient of a non-linear correction curve and an allowable ... | 12/26/2000 |
| 5990979 | Gamma correction circuit and video display apparatus using the same A gamma correction circuit is provided for gamma correcting first and second polarity video signals of different polarity. The gamma correction circuit includes first and second resistance elements R1, R2 connected in series between a power supply termina... | 11/23/1999 |
| 5940058 | Clamp and gamma correction circuit, and image display apparatus and electronic machine employing the same A clamp and gamma correction circuit which processes an image signal through a clamp circuit and then a gamma correction circuit in that order to perform a proper gamma correction with a clamp voltage adjusted to its appropriate value. An image signal var... | 08/17/1999 |
| 5838396 | Projection type image display apparatus with circuit for correcting luminance nonuniformity In a projection type image display apparatus, the screen is divided and a memory to record luminance correction data corresponding to the divided regions is provided, and addresses of the divided regions of the screen are set by an address counter, synchr... | 11/17/1998 |
| 5801773 | Image data processing apparatus for processing combined image signals in order to extend dynamic range An image data processing apparatus includes a controller which matches a dynamic range of image data to be outputted to an output unit to a dynamic range of data and/or to an output characteristic of the output unit so that the data may be processed in th... | 09/01/1998 |
| 5737015 | Imaging device equipped with multiple output channel imaging element The direct current voltage level and amplification of a multiple channel output imaging element are adjusted by comparing the output values of each channel. A calculating device, such as, for example, a CPU uses the data of one channel (i.e., a standard c... | 04/07/1998 |
| 5708482 | Image-signal clamping circuit for electronic endoscope An image-signal clamping circuit processes image signals obtained from a solid state image sensor provided at a distal end of an electronic endoscope which do not have a direct-current component to restore a direct-current component thereof. The clamping ... | 01/13/1998 |
| 5598225 | Method and apparatus for improving transmitted video signal structure A video processor, having an input and an output, for compensating for accumulated phase and amplitude errors encountered during transmission of a video signal over a communications channel. The video processor includes a high-pass filter and amplifier, c... | 01/28/1997 |
| 5546135 | Contour restoration apparatus A contour restoration circuit comprises an input terminal, a plural of delay circuits connected to the input terminal in series, a maximum value detection circuit, a minimum value detection circuit, a mean value calculating the mean value from the maximum... | 08/13/1996 |
| 5539425 | Display unit A display unit in which a black level is set to a predetermined level in a first display screen having a first aspect ratio and a black level is set to a predetermined level in a second display screen having a second aspect ratio is provided. A darkest si... | 07/23/1996 |
| 5486874 | Method and apparatus for improving transmitted video signal structure A video processor, having an input and an output, for compensating for accumulated phase and amplitude errors encountered during transmission of a video signal over a communications channel. The video processor includes a high-pass filter and amplifier, c... | 01/23/1996 |
| 5459531 | Gamma-compensating circuit using the amplification degree of a transistor A gamma-compensating circuit has a voltage amplifying unit for amplifying a gamma-compensated picture signal from a broadcasting station and a nonlinear-compensation unit for converting an output amplification degree of the voltage amplifying unit to line... | 10/17/1995 |
| 5408335 | Image processing device for correcting an offset of an image signal An image signal sent from an image sensor is input to the inverting terminal of a differential amplifier. An A/D converter converts an output of the differential amplifier to digital output data. A comparison circuit compares the digital output data with ... | 04/18/1995 |
| 5257108 | Video signal processing circuit for improving contrast for an LCD display A video signal process circuit which stretches the black level of a signal voltage for a dark picture and the white level of the signal voltage for a bright picture so as to improve visual contrast and reproduce a clear picture even when a light valve wit... | 10/26/1993 |
| 5142354 | Signal level correction circuit for a video signal A signal level correction circuit for a video signal includes a voltage control amplifier for amplifying a video signal received from a solid state image sensor with different gains for the respective chrominance signals, a first clamp circuit for setting... | 08/25/1992 |
| 4797744 | Method and circuit for nonlinear transmission-processing of a video signal A gamma stage of a television camera is automatically provided with regulation removing effect of variations in temperature, supply voltage and the like by means of two series of control pulses added to the video signal in blanking intervals of the signal... | 01/10/1989 |
| 4797745 | Video image enhancer A video image enhancer is disclosed for use in surveillance at low light levels to enhance dark and/or low contrast segments of a composite video signal of a surveyed scene by subjecting the dark and/or low contrast segments thereof to high gain and brigh... | 01/10/1989 |
| 4701786 | Pedestal control circuit In a pedestal control circuit, a reference signal is superposed on a video signal before gamma correction. The reference signal component is detected from the gamma-corrected video signal. The level of the detected reference signal component is compared w... | 10/20/1987 |
| 4689678 | Gradation distortion compensation by FET pre-emphasis circuit operating in FET saturation region A video signal as it comes from a camera is inverted and clamped to an adjustable voltage for the black level and then proceeds at an amplified level to a differential amplifier that applies a signal to the gate of an N-channel FET. The voltage source pro... | 08/25/1987 |
| 4686562 | Gamma correction circuit A gamma correction circuit superimposes gamma reference pulse on the input video signal and, after further superimposing this on a pedestal signal, gamma corrects the signal to the maximum value using a fixed gamma correction circuit and sends this correc... | 08/11/1987 |
| 4651210 | Adjustable gamma controller A gamma corrector for a video signal includes a first amplifier, a nonlinear signal translating stage and a second amplifier coupled in cascade in the order named. A feedback network coupled between the output of the second amplifier and a gain-control in... | 03/17/1987 |
