Abstract: A chrominance signal can be separated from a composite color television signal without misdetection in correlation detection even when the chrominance signal level is small by calculating vertical correlation values, comparing them with the threshold value corresponding to the chrominance signal level and judging if there is correlation or not. A chrominance signal separating apparatus includes a cascade connection of delay devices, where each delay device delays an input signal by 1H period. Comb filters separate a luminance signal and a chrominance signal from the composite color television signal by inputting two signals from the input and the output of each delay device which have a 1H period time difference. The output of one of the delay devices is regarded as a reference signal. A correlation detecting circuit calculates correlation values between the reference signal and a signal at the vertical vicinity of the reference signal on the screen.

Abstract: A luminance and color signal isolation device having a horizontal nonlinear luminance signal dector which is detecting a luminance signal from a synthesis picture signal as an input without having any change to the horizontal direction; and a vertical nonlinear luminance signal dector which is detecting the luminance signal with the synthesis picture signal as an input without having any change to the vertical direction. A color signal detector detects a color signal from the synthesis picture signal; and a delay device which delays the synthesis picture signal for a certain time in order to be in synchronism with the output signal of the color signal detector. A subtractor subtracts an output signal of the color signal detector from the output signal of the delay device; and a control signal generator detects any change of the synthesis picture signal to the vertical or horizontal direction and also generates control signals of CS11 and CS12.

Abstract: A filter is used for separating luminance and color signals from a composite color television signal in which the frequency of the color signal is multiplexed over the high-frequency region of the luminance signal. When a picture is detected with respect to its motion under frame correlation, and if that motion is relatively small, the separation of luminance and color signals is performed based on interframe correlation. If the motion is relatively large, the separation of luminance and color signals is made based on interfield correlation. The luminance and color signal separation based on the interfield correlation is attained from a correlation with signals in fields spaced forwardly and rearwardly away from the subject field by one field. This is accomplished by selecting a calculation having the highest among a plurality of calculations for an objective sample point and a plurality of sample points located about the objective sample point.

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 (Y) and chrominance (C) signals separating filter includes a movement detecting circuit which partially detects a movement of an image utilizing a correlation between frames; an inter-frame YC separating circuit which performs a separation utilizing the inter-frame correlation when the movement detecting circuit detects a still image, and outputs intra-frame YC separated C signals and intra-frame YC separated Y signals; an intra-frame YC separating circuit which partially detects a correlation between fields or between frames and a correlation in a field when the movement detecting circuit detects a moving image, performs a separation utilizing the correlations, and outputs intra-frame YC separated C signals and intra-frame YC separated Y signals; a C signal mixing circuit which mixes the inter-frame YC separated C signals and the intra-frame YC separated C signals in accordance with an output of the movement detecting circuit and outputs movement adaptive YC separated C signals; and a Y signal mi

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: The luminance signal-color signal separating circuit obtains signals of three lines by a 1H delaying circuit. Further, by unit delaying circuits, signals at three points are obtained in each line. Thus, signals at nine points continued vertically and horizontally are input into a color signal detecting circuit which determines an oblique correlation of the signals at these nine points to thereby obtain the degree of the color. The color signal detecting circuit obtains a color signal output having had the oblique luminance component removed by the operation of the color signal component from a three-line color separating circuit and the degree of the color.

Abstract: A method and circuit for preventing the deterioration of picture quality in a video processor is disclosed in which, when an input color video signal is input, a clock signal for a combfilter is locked with a phase-locked loop (PLL) by a burst signal and when a monochrome video signal without the burst signal is input, the clock signal is locked by the output (quasi-burst signal) of a voltage-controlled oscillator of the PLL circuit, before the lapse of one horizontal period, so that the clock signal is constantly locked by a multiple (4 fsc) of the burst signal regardless of the presence or absence of the burst signal of the input video signal. According to a color/mono signal discriminating result, either the burst signal or the quasi-burst signal is selected as a reference signal so that the reference signal is locked to provide a clock signal having a constant phase and frequency, thereby preventing aliasing due to clock variations when the monochrome signal is input and thus improving picture quality.

Abstract: A color separator (12) for a digital television receiver (10). The incoming television signal is directed to two different paths in the color separator (12). Along a first path, the luminance component is separated by an analog Y separator (12a) and then sampled by an A/D converter (12b) at a rate that will provide a desired number of samples per display line. Along a second path, the composite signal is sampled by an A/D converter (12c) at a rate appropriate for digital color separation, and then the chrominance samples are separated using a digital C separator (12d). A scaling unit (12e) then scales the chrominance samples to provide a desired number of samples per line.

Abstract: A composite video signal is separated into a luminance signal and a color signal according to spectrum distributions thereof.

Abstract: A digital multiband filter separates luma data and chroma data from a digitized composite video signal. A multiband filter receives a digital composite video input signal and provides a low-pass response at a first predetermined frequency containing the luma data, a band-pass response between second and third predetermined frequencies containing the chroma data, and a high-pass response. A notch filter rejects the band-pass response from the multiband filter while passing the luma data. A delay circuit delays the multiband output signal to match the delay through the notch filter. A junction circuit subtracts the low-pass response provided from the delayed multiband signal to isolate the chroma data. An alternate embodiment replaces the notch filter with a band-pass filter to provide a band-pass response with the chroma data at its output. The band-pass response is subtracted from the delayed multiband signal for providing the luma data.

Abstract: An assembler and splitter of a Weston PAL (W-PAL) video signal has filter functions F.sub.1, F.sub.2 at the assembler for the luminance and chrominance components and corresponding functions F.sub.3, F.sub.4 at the splitter. The transfer functions are defined as F.sub.1 =(L.sub.2 +L.sub.1)/2+(L.sub.2 -L.sub.1)z-.sup.1 /2, F.sub.2 =-(H.sub.1 -H.sub.2)/2+(H.sub.1 +H.sub.2)z.sup.-1 /2, F.sub.3 =(L2-L.sub.1)/2+(L.sub.2 +L.sub.1)z.sup.-1 /2, F.sub.4 =(H.sub.1 +H2)/2-(H.sub.1 -H.sub.2)z.sup.-1 /2 and wherein H.sub.1 (f)=L.sub.2 (2fsc-f) and H.sub.2 (f)=L.sub.1 (2fsc-f). Thus the filters are non-sharp cut and are compatible with normal PAL.

Abstract: A filter for separating a color signal and a luminance signal from a composite color television signal in which the frequency of said color signal is multiplexed in a high-frequency region of the luminance signal. In response to the movement of a picture, an appropriate filter is selected from a filter utilizing interframe correlation, a filter utilizing interfield correlation and a filter utilizing the infield correlation. A plurality of filters utilizing filed correlation are prepared and a color signal and a luminance signal are separated by the processing of a principal pixel, which is an object of processing, and pixels different from each other. A filter is selected in accordance with the correlation state between the principal pixel and the pixels therearound.

Abstract: A video signal processing circuit is incorporated in an IC for camcorder in which a camera signal outputted from a CCD image sensor is processed in a digital manner such that luminance and color signals can be outputted. In the IC, a vertical interpolation circuit produces two kinds of vertically interpolated data on the basis of a digital camera signal of one channel within an image area being set by an electronic zoom function. A YC separation circuit receives the two kinds of vertically interpolated data, and an output of the YC separation circuit is applied a horizontal interpolation circuit or an RGB composition circuit. If the YC separation output is applied to the horizontal interpolation circuit, the same outputs two kinds of horizontally interpolated data upon which three primary color signals are composed by the RGB composition circuit.

Abstract: A motion detecting circuit for a video signal processor having a filter arrangement for separating the video signal into the low and high frequency components, a first detecting circuit for detecting a low frequency luminance moving signal, a second detecting circuit for detecting a high frequency luminance moving signal, a third detecting circuit for detecting a chrominance moving signal, a first threshold circuit for generating a low band luminance motion digit signal, a second threshold circuit for generating a high band luminance motion digit signal, a control circuit coupled for generating a control signal in response to the low and high band luminance motion digit signals, a gate circuit for selectively transmitting the chrominance moving signal in response to the control signal and a selector for selectively outputting the one of the low frequency luminance moving signal and the chrominance moving signal having the high signal intensity.

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 delay 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: The present invention relates to a video memory in a digital image processing device, and more particularly to a data read device for a video memory capable of reading plural types of data recorded together in a predetermined ratio as recorded beforehand in an initial memory. In particular, luminance signal data and chrominance signal data are recorded intermingled with one another in a video memory in proportion to a ratio determined by the composite image signal. The circuitry of the present invention then separates the luminance signal data and the chrominance signal data, so that signal processing can be executed. As a result, since the data can be recorded in a mixed fashion and then separated, video memory space is used more efficiently.

Abstract: Apparatus that is self-contained with video equipment, such as a video camera or video record/playback device, and which generates video signal adjustment data for use by video signal processing circuits that are included in such video equipment. An input video signal is coupled to luminance and/or chroma digital signal processing circuits which are supplied with luminance or chroma adjustment control data, respectively, for subjecting the input video signal to predetermined luminance or chroma adjustment operations, thereby producing adjusted digital luminance and chroma signals, respectively. At least one of the adjusted digital luminance and chroma signals is sampled at preselected times; and the sampled digital signals are used by an adjustment control data generator for generating the luminance and/or chroma adjustment control data that are supplied to the luminance and/or chroma digital signal processing circuits.

Abstract: A circuit for a video camera for color separation and contour correction which can perform color separation and contour correction of a signal from a charge coupled device image sensor specifically utilizing two 1H (1 horizontal period) delay elements. The circuit adds a 2H delayed chrominance signal from a delay unit and a current input chrominance signal. This sum is then decreased by one-half. The circuit separates red and blue components of the chrominance signals decreased by half and from the 1H delayed chrominance signal from the delay unit. Next, vertical and horizontal contour correcting signals are generated in response to the 1H delayed chrominance signal from the delay unit and in response to the output of an amplifying unit. Thus, the present invention uses two 1H delay elements to perform color separation as well as contour correction to thereby simplify the overall circuit design.