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 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 color television system including an encoding device in which the chrominance and high-frequency luminance are sub-sampled in time. In the decoder, the high-frequency of the color television signal of the first and second fields are added thereby eliminating cross-luminance and the demodulated, low-frequency color difference signals are added thereby eliminating cross-color.

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 quadrature modulated luminance/color signal separating device applied in a color television receiver. The most suitable luminance/color signal separation is performed by determining sizes of interference components in gross, fine, and superfine structures, thereby solving cross-color, cross-luminance and deterioration of resolution generated in fixed luminance/color signal separation. According to the present device, a control signal properly corresponding to a composite video signal can be generated using a control signal generated in a spectrum distribution adaptive system, and consistency of control signal can be kept by introducing a concept of IIR filter into the control signal. Also, luminance/color signal separation suitable for human visual characteristic can be done, and the luminance/color separating function in a 2-dimensional region can be improved by interference elimination function.

Abstract: An input of a charge coupled device (CCD) delay element is an additional signal of a reproduced luminance signal and a reproduced chrominance signal, while an output of the CCD delay element is separated by an LPF and a BPF into a delayed luminance signal and a delayed chrominance signal, thereby constituting a comb filter by using the input signal before an addition and delayed/reproduced signals. Accordingly, it is unnecessary to provide a filter for limiting a band width, which is inserted into a main signal path. Furthermore, since it is possible to constitute a comb filter which does not narrow a signal band width of the reproduced luminance signal and the reproduced chrominance signal, there can be provided a comb filter for removing a cross-talk and noises and which does not narrow a signal band width of the luminance signal and the chrominance signal.

Abstract: Cross talk between luminance and chrominance is eliminated in a Weston Clean PAL codec by replacing the band pass filter used in a conventional codec with a high pass filter (L) and introducing a compensating low pass filter (X) into the chrominance path, the filters being chosen such that L=4F'*(1-F') and X(f)=(F'(f):(1-F'(f)) where F'=F(2fsc-f) and L is a low pass (5.5 MHz) filter 248 applied before transmission in the PAL channel.

Abstract: A Y/C separation circuit includes a first adder by which a carrier-multiplexed composite video signal is produced by multiplexing a color sub-carrier signal which is in synchronization with a color burst signal on a composite video signal during a vertical blanking period. The carrier-multiplexed composite video signal inputted to a 1H delay line and outputted from the 1H delay line. The carrier-multiplexed composite video signals at the input and the output of the 1H delay line are inputted to a second adder, and a subtracter, respectively. A luminance signal component and a chrominance signal component are respectively outputted from the second adder and the subtracter.

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: Horizontal and vertical peaking signals are separated from a video signal by combining variously delayed responses to the video signal. A cross-fader combines the separated horizontal and vertical peaking signals in proportions determined by a cross-fader control signal. A correlator responds to ones of the variously delayed responses to the video signal for generating an output signal representative of the relative degrees of vertical and horizontal correlation in the video signal. The correlator output signal addresses a read-only memory that supplies the cross-fader control signal. The adaptively generated peaking signal is suitable for adjustably peaking a luminance component extracted from the video signal, where that video signal is a composite signal also including a chrominance component.

Abstract: A comb filter circuit (1) with a usual comb filter (3) contains a circuit to detect line-parallel color edges. To that effect, envelope curves (Sf2, Sf3) are created from the addition signal (Sb) and the subtraction signal (Sc) of the delayed and the undelayed color signal (Si) on the input side of envelope curve demodulators (23, 15), and a control signal (St) is created in a comparator circuit (38) by comparing the envelope curves, which adjusts the signal portions of the transmitted and delayed color signal on the input side, and transmits them with an adjustable electronic fader control (40) to the signal output (29) of the comb filter circuit. To ensure trouble-free control even under operating conditions, during which a large portion of cross talk signals are scanned, an additional comb filter (31) is connected to the signal path of the subtraction signal (Sc), which eliminates most of the cross talk portions on this signal path.

Abstract: In a video signal transmission/reception system based on interlace scanning, video signals picked up by the sequential scanning are limited in vertical frequency band by filters (3a), (3b) and (3c) and transmitted as an interlace scanning video signal. Then, a signal of a predetermined vertical frequency band is extracted from the signal thus transmitted and a motion detection is carried out on the basis of the thus extracted signal.

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 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: Cross color from composite television signals is suppressed by averaging baseband chrominance samples spaced a certain number of frames apart, or when motion is detected in the television signals, by averaging baseband chrominance samples spaced a certain number of lines apart. Cross color suppression when motion is detected may be improved by low-pass filtering the line-spaced chrominance sample average. Both NTSC and PAL implementations are presented.

Abstract: An encoding apparatus and method for encoding color television signals which improves the quality of a display image by selecting the most effective passband of a motion and pattern adaptive 3-D filter according to the shape of a pattern or the still and motion image signals, which prevents mixing of a luminance signal and a chrominance signal at an encoding site to obtain the highest resolution for the display image.

Abstract: A luminance/chrominance separator includes a high pass filter for separating a high-frequency signal from a composite video signal, an adder for finding a sum signal indicative of a sum of signals before and after one horizontal period with respect to the high-frequency signal, a subtracter for finding a difference between the signals before and after one horizontal period, and a selection circuit for selecting smaller one of the sum and difference signal in absolute value, wherein an output of the selection circuit is used to suppress any leakage of luminance and chrominance signals into the output of a comb filter.

Abstract: A digital image signal processing circuit for use in a VTR with camera has a signal input terminal to which an image pickup output signal or a video signal is supplied, an analog to digital converter for producing a digital image pickup output signal based on the image pickup output signal or a digital video signal based on the video signal, a digital signal processing portion including first, second and third digital signal processing circuit blocks, a system controller for conducting the change of operation, the change of circuit configuration or the change of circuit coefficient in each of the first, second and third digital signal processing circuit blocks, and signal output terminals from which recording luminance and carrier chrominance signals produced by the digital signal processing portion are derived.

Abstract: An image signal treatment apparatus prevents degradation of picture quality which can occur because of various interferences phenomena arising from causes such as a hanging dot and its motion. The inventive apparatus performs proper correlation by taking into account the motion components of a composite image signal during Y/C signal separation. The inventive apparatus separates the luminance and chrominance signals of the composite image signal according to the motion components with respect to the composite image signal during separation. The apparatus is provided with filters which output luminance and chrominance signals by filtering the composite image signal horizontally, vertically and temporally. Motion detection circuitry outputs detection coefficients by detecting vertical and horizontal motion of the composite image signal. Mixers are provided to mix the luminance and chrominance signals outputted from the filters according to the detection coefficients of the respective motion detection circuitry.