Abstract: A method for generating a pixel filtering boundary required by the auto white balance (AWB) calibration is proposed. The method includes: taking a specific color temperature reference point as a center and dividing a G/B-G/R color space into six color regions having different color component relationships; based on a saturation calculating approach of a HSV color space, respectively identifying six color boundaries in the six color regions to generate a specific hexagonal filtering boundary, so that each color boundary has a predetermined saturation difference with the specific color temperature reference point; adopting the approach for generating the specific hexagonal filtering boundary to respectively identify multiple hexagonal filtering boundaries corresponding to other color temperature reference points; generating an enveloping boundary as a pixel filtering boundary based on the specific hexagonal filtering boundary and the multiple hexagonal filtering boundaries.

Abstract: A method to enhance detail of an image based on noise elimination includes calculating a noise weight corresponding to a probability that a center pixel, located in a block of pixels of a region of the image, is noise by using a difference between the center pixel and a surrounding pixel located in the block of pixels, calculating a first substitution value for the center pixel based on the noise weight; and calculating a second substitution value for the center pixel by using the noise weight and a sharpen filter.

Abstract: A decoder and a method for separating luminance and chrominance information from a target pixel in a composite video signal are provided. The decoder comprises a delay module, a filter module, a weighting factor generator, and a separator. The delay module is configured to delay a plurality of horizontal lines of the composite video signal to output a plurality of pixels including the target pixel. The filter module is coupled to the delay module and configured to filter the composite video signal in a horizontal direction and a vertical direction to generate a plurality of frequency components. The weighting factor generator is configured to generate a first weighting factor of the target pixel according to the horizontal direction and a second weighting factor of the target pixel according to the vertical direction. The separator is configured to separate luminance information from the target pixel in accordance with the frequency components, the first weighting factor, and the second weighting factor.

Abstract: One or more processors and/or circuits receive a composite video signal and determine a current pixel and a plurality of reference pixels. A plurality of weighting factors corresponding to the reference pixels are determined utilizing non-local means. Chroma components and/or luma components for the current pixel are determined based on weighted least squares utilizing the reference pixels, the weighting factors and information known about the composite signal, for example, sub carrier information. The composite video signal may comprise baseband Y and modulated Cb and/or Cr components. Weighting factors are determined by comparing a block of pixels about the current pixel with a block of pixels about the corresponding reference pixels in a current, previous or future frame. A set of equations comprising reference pixel data, a set of weighting factors and/or the known information may be solved to the determine signal components.

Abstract: The invention provides techniques for separating luma and chroma signal components in a composite SECAM video signal. During reception, the SECAM video signal is split into luma and chroma output. The amplitude of the chroma carrier is monitored during reception. If the chroma carrier amplitude is greater than a threshold, the value of the chroma output can be reduced. Also, if the chroma carrier amplitude is greater than another threshold, a portion of the chroma carrier can be added to the luma; or the trap band of the band-trap filter for extracting luma from the composite video can be reduced. The respective amount of the reduction in the chroma output and the increase in the luma output are independently determined but both may proportional to the magnitude of the deviation in the chroma carrier amplitude from the different thresholds.

Abstract: A signal separator for separating luminance and color signals from a composite video signal includes: a first band pass element for passing a part of the composite video signal within a color signal band and within a predetermined frequency band; a second band pass element for passing a part of the first filtered signal within the color signal band and without the predetermined frequency band; and a first subtraction element for subtracting the first filtered signal from the composite video signal, wherein the predetermined frequency band is a frequency range in which the separation of the composite video signal into the color and the luminance signals is difficult.

Abstract: A signal separator for separating luminance and color signals from a composite video signal includes: a first line delay element for delaying the composite video signal by one line period; a second line delay element for delaying the composite video signal by two line periods; an adder element for adding the first and second delay signals; a subtraction element for subtracting the second delay signal from the first delay signal; a control signal generator for passing a part of the addition signal within a predetermined frequency band therethrough; and a gain control element for reducing a level of the subtraction signal based on the control signal.

Abstract: To provide a three-dimensional Y/C separating circuit that has a high responsibility to a motion in a video signal and can reduce a memory capacity, a three-dimensional Y/C separating circuit has a 2-frame memory 14 that delays a color signal by an inversion period thereof to produce a delayed composite video signal, a luminance motion detecting part that produces a first frame correlation signal by a subtraction processing between the delayed composite video signal and a composite video signal, an adding circuit 23 that produces a mixed video signal by an addition processing between the delayed composite video signal and the composite video signal, a frame memory 24 that delays the mixed video signal by one frame period, a subtracting circuit 25 that produces a second frame correlation signal by a subtraction processing between the mixed video signal and the mixed video signal delayed by one frame period, a determining circuit 26 that determines a motion from the first and second frame correlation signals an

Abstract: An image processing method and an image processing apparatus are provided. After receiving an image signal, the image and apparatus according to the invention first judge whether a target block in the image signal includes a non-chroma line. If the judging result is YES, a first edge detection procedure will be performed on the non-chroma line. If the judging result is NO, a second edge detection procedure will be performed on the target block.

Abstract: An image-information acquiring unit acquires image information. A component separating unit separates the image information acquired into luminance information and color information. A luminance-component-noise removing unit removes noise from the luminance information using a first noise removing method. A color-component-noise removing unit removes noise from the color information using a second noise removing method different from the first noise removing method used in the luminance-component-noise removing unit.

Abstract: A system and method for determining whether to process a signal using three-dimensional comb filtering. Various aspects of the present invention may comprise method steps and system components that generate an inter-frame chroma signal. Various aspects may generate a filtered inter-frame chroma signal by removing a band of frequency components from the inter-frame chroma signal that generally corresponds to chroma signal components. Various aspects may analyze the filtered inter-frame chroma signal to determine whether three-dimensional comb filtering may be appropriate. Various aspects may comprise method steps and components that generate inter-frame and intra-frame luma signals. Various aspects may generate filtered inter-frame and intra-frame luma signals by removing frequency components from the inter-frame and intra-frame luma signals, respectively, that fall outside a frequency band near the chroma sub-carrier frequency.

Abstract: An apparatus for converting input image signals into image signals that can be displayed in an image display device. The image display device includes a color space converter converting color components of the input image signals and color components that can be displayed in the image display device into color space, a hue control variable calculator comparing a converted color gamut with each other to calculate a hue control variable, and a hue controller controlling hues of the input image signals using the hue control variable.

Abstract: A Y/C separation circuit according to the present invention includes: a pattern determination section in which video signals “a”, “b”, and “c” of three lines from which a frequency band of a chrominance subcarrier is extracted through BPFs to determine whether an addition/subtraction result of (b?a), (b+a), (b?c), (b+c), (c?a), and (c+a) is positive or negative, thereby determining relations in amplitude and phase between the video signals “a”, “b”, and “c”; and a filtering section in which one of plural filtering operations for separating a chrominance signal is selected in accordance with the determination result sent from the pattern determination section to output a chrominance signal through the selected filtering operation.

Abstract: A system which utilizes the processing capabilities of the graphics processing unit (GPU) in the graphics controller. Each frame of each video stream is decoded. After decoding the compressed image is separated into an image representing the luminance and an image representing the chroma. The chroma image is resampled as appropriate using the GPU to provide chroma values corresponding to each luminance value at the proper locations. The resampled chroma image and the luminance image are properly combined to produce a 4:4:4 image, preferably in the RGB color space, and provided to the frame buffer for final display. Each of these operations is done in real time for each frame of the video.

Abstract: A system and method for determining whether to process a signal using three-dimensional comb filtering. Various aspects of the present invention may comprise method steps and system components that generate an inter-frame chroma signal. Various aspects may generate a filtered inter-frame chroma signal by removing a band of frequency components from the inter-frame chroma signal that generally corresponds to chroma signal components. Various aspects may analyze the filtered inter-frame chroma signal to determine whether three-dimensional comb filtering may be appropriate. Various aspects may comprise method steps and components that generate inter-frame and intra-frame luma signals. Various aspects may generate filtered inter-frame and intra-frame luma signals by removing frequency components from the inter-frame and intra-frame luma signals, respectively, that fall outside a frequency band near the chroma sub-carrier frequency.

Abstract: An oblique correlation detection section detects correlation in an oblique direction (oblique correlation) of a composite video signal. A line correlation chrominance separation section extracts a first chrominance signal from the composite video signal based on vertical correlation of the composite video signal. A first chrominance signal acquisition section acquires a second chrominance signal based on horizontal self-correlation of the first chrominance signal. The first chrominance signal acquisition section detects the self-correlation within a range corresponding to the degree of the oblique correlation detected by the oblique detection section.

Abstract: A luminance signal/chrominance signal separation apparatus is provided with a detector for detecting diagonal components of a luminance signal from a composite video signal, wide-band pass filters, and narrow-band pass filters, wherein band pass filters to be connected to a three-line chrominance separation circuit are selected according to the amount of diagonal components of the luminance signal, thereby reducing cross color and improving resolution.

Abstract: A luminance signal/chrominance signal separation apparatus is provided with a detector for detecting diagonal components of a luminance signal from a composite video signal, wide-band pass filters, and narrow-band pass filters, wherein band pass filters to be connected to a three-line chrominance separation circuit are selected according to the amount of diagonal components of the luminance signal, thereby reducing cross color and improving resolution.

Abstract: A system with chrominance delay lines has a first sampled channel including at least one smoothing filter, and has a second unsampled channel. A continuous bypass filter is placed in the second channel to balance the pulse response from these two channels.

Abstract: In a signal processing circuit for separating a color video signal into a luminance signal and a chrominance signal, whether the correlation relating to the high frequency component of luminance signal and chrominance signal of color video input signal is high or low before and after one horizontal scanning period is detected by a vertical correlation detecting circuit, and the presence or absence of correlation of the detected output signal in the horizontal scanning line is detected by a horizontal correlation detecting circuit. The output signal of the horizontal correlation detecting circuit before and after one horizontal scanning period is supplied into a logic circuit, and depending on the gate output signal obtained therein, the high frequency component of luminance signal and chrominance signal before and after one horizontal scanning period are processed in an operation processing circuit, and a chrominance signal is delivered.

Abstract: A 2-line YC separation device reduces the number of delay circuits used for horizontal scanning time delay and minimizing arithmetic operation errors of comb-line filters.

Abstract: An apparatus and a method are provided for smoothing out high frequency information in an interlaced computer generated display. A computer generated RGB signal is converted into a YUV signal, which is separated into its Y, U, and V components. The Y component is convolved by averaging a current scan line with a line above and a line below the current scan line so that black lines are lightened and white lines are darkened, thus avoiding flicker. Since convolution is only performed on the Y part of the YUV signal, only two line buffers, each having a width equal to the number of bits in the Y component only, are required.

Abstract: A method and arrangement for separating interleaved luminance and chrominance color space components data in a single data stream with minimum CPU intervention is provided. In the separating circuit, the separating circuit receives as input a series of graphics/video image data composed of interleaved luminance and chrominance color space components at successive clock cycles. The separating circuit directs selected bytes of the graphics/video image data representing the luminance color space component to a first path wherein luminance component data received at two successive clock cycles are combined. Likewise, selected bytes of the graphics/video image data representing the chrominance color space component are directed to a second path wherein chrominance component data received at two successive clock cycles are combined. Then, the combined luminance and chrominance component data are output alternately.

Abstract: A method of determining a chrominance element for pixel signals of an optical image for a 1H delay circuit. The pixel signal(s) are first filtered through a band-pass filter to remove low frequency luminance components and a part of the filtered signal is fed through a 1H scan line delay. The result is a OH pixel signal and a 1H pixel signal one scan line apart. The OH pixel signal is added to the 1H pixel signal to generate a combed chrominance component, and the OH pixel signal and the combed chrominance component are compared to see which is the greater. If the value of the OH pixel signal is greater or equal to the combed chrominance component, the combed chrominance component is output as the chrominance element. If the value of the OH pixel signal is less than the combed chrominance component, the OH pixel signal is output as the chrominance element.

Abstract: An apparatus and a method for separating luminance and color signals from an input video signal.

Abstract: In a YC separating filter, a first horizontal chrominance extraction filter extracts frequency components corresponding to components of a color subcarrier in a horizontal direction to produce a first chrominance signal, a vertical chrominance extraction filter extracts frequency components corresponding to components of a color subcarrier in a vertical direction to produce a second chrominance signal, a horizontal and vertical chrominance extraction filter extracts frequency components corresponding to components of a color subcarrier in horizontal and vertical directions to produce a third chrominance signal, a first selector selects one of the first, second and third chrominance signals, a second horizontal chrominance extraction filter having a narrower bandwidth than the first horizontal chrominance extraction filter is provided to receive the selected chrominance signal, and a second selector selects the output of the second horizontal chrominance extraction filter when the first selector selects either

Abstract: A filter for motion adaptive Y/C separation, which is capable of obtaining image of high resolution and little picture quality degradation in the case where an image is switched from static one to motion one or vice-versa, is provided with a filter for extracting Y signal outputting Y signal and a filter for extracting C signal outputting C signal, by detecting whether image is motion one or static one by a motion detecting unit, and when motion image is detected, by detecting partially interframe correlation or correlation in three fields, and according to the detection result, by adaptively switching a plurality of processings for extracting intraframe Y signal and a plurality of processings for extracting intraframe C signal.

Abstract: A video signal processor is used in connection with a television set or similar apparatus for processing a video signal input for every horizontal line period. A video signal is processed by operations such as comparison and addition of a video signal, a first delay signal which is delayed by a one-horizontal line period and a second delay signal which is delayed by a two-horizontal line period. Since there is a horizontal correlation in a video signal, it is possible to separate a color signal from a luminance signal and remove the noise component from the luminance signal by a predetermined operation. The comparison is substantially the subtraction of the signals which are output one after another by a delay of one horizontal line period in series, thereby avoiding such trouble as color edging.

Abstract: A video signal processor is used in connection with a television set or similar apparatus for processing a video signal input for every horizontal line period. A video signal is processed by operations such as comparison and addition of a video signal, a first delay signal which is delayed by a one-horizontal line period and a second delay signal which is delayed by a two-horizontal line period. Since there is a horizontal correlation in a video signal, it is possible to separate a color signal from a luminance signal and remove the noise component from the luminance signal by a predetermined operation. The comparison is substantially the subtraction of the signals which are output one after another by a delay of one horizontal line period in series, thereby avoiding such trouble as color edging.

Abstract: A brightness signal/color signal separating filter. Non-correlative energies are extracted in various combinations of the horizontal scanning direction, the vertical scanning direction, a brightness signal and a color signal so as to judge the degree of video correlation in the horizontal direction and in the vertical direction.

Abstract: A brightness signal/color signal separating filter. Non-correlative energies are extracted in various combinations of the horizontal scanning direction, the vertical scanning direction, a brightness signal and a color signal so as to judge the degree of video correlation in the horizontal direction and in the vertical direction.

Abstract: A luminance/color signal separation apparatus comprising an analog/digital converter for converting a composite video signal inputted therein into a digital composite video signal, an adjacent signal detection circuit for detecting from the composite video signal from the analog/digital converter a target composite video signal from which luminance and color signals are to be separated and vertically and horizontally composite video signals, two-dimensional, horizontal and vertical pseudo median filtering circuits for outputting first to third luminance signals, respectively, a control signal generation circuit for generating horizontal and vertical control signals, a luminance signal selection circuit for selecting one of the first to third luminance signals in response to the horizontal and vertical control signals and outputting the selected luminance signal as the final luminance signal, a delay unit for delaying the target composite video signal by a predetermined time period for a timing matching with t

Abstract: A logical comb filter comprises a first delay circuit receiving an input composite video signal called a succeeding signal for delaying the received succeeding signal by one scan line period so as to output a main signal composed of the delayed succeeding signal, and a second delay circuit receiving the main signal for delaying the received main signal by one scan line period so as to output a preceding signal composed of the delayed main signal. An addition circuit is connected at its first input to receive the main signal. A selection and control circuit receives the succeeding signal, the main signal and the preceding signal for supplying the succeeding signal to a second input of the addition circuit when the relation of the main signal>(is greater than) the succeeding signal>the the preceding signal or the relation of the preceding signal>the succeeding signal>the main signal is satisfied.

Abstract: A color image processing system includes a color television camera monitoring an object to provide a video signal comprising three primary color components, and a color determination section which defines particular hue, chroma, and brightness regions. The video signal from the camera is analyzed at the color determination section in such a manner as to determine the video signal denotes the particular hue, chroma, and brightness when the three primary color components are found to fall within the particular hue, chroma, and brightness regions, respectively. Thus determined video signal is extracted as forming individual color signals indicating filtered images of the object with regard to the particular hue, chroma, and the brightness, respectively.