Motion detector for chrominance signal in TV receiver
First Claim
1. A motion detector for a chrominance signal for use with a TV receiver for detecting a motion of a chrominance signal contained in a video signal and generating a chrominance signal motion detection signal, comprising:
- a first input terminal adapted to be supplied with a digitalized video signal containing a luminance signal and a chrominance signal;
a frame memory connected to said first input terminal and supplied with said digitalized video signal from said first input terminal, for delaying said video signal by one frame period and generating a delayed video signal;
a first comb-type filter including a first 1 horizontal period delay element and a first adder, connected to said first input terminal, and supplied with said digitalized video signal from said first input terminal, for removing a luminance signal contained in said digitalized video signal and selecting a first chrominance signal;
a second comb-type filter including a second 1 horizontal period delay element and a second adder, connected to said frame memory, and supplied with said delayed video signal from said frame memory, for removing a luminance signal contained in said delayed video signal therefrom and generating a second chrominance signal;
a subtracter connected to said first comb-type filter and said second comb-type filter, supplied with said first chrominance signal from said first comb-type filter and said second chrominance signal from said second comb-type filter, for generating a difference signal between said first and second chrominance signals;
a first absolute value conversion circuit connected to said subtracter and supplied with said difference signal from said subtracter, for generating an absolute value difference signal; and
a smoother circuit connected to said first absolute value conversion circuit and supplied with said absolute value difference signal from said first absolute value conversion circuit, for smoothing a digital difference signal and generating said smoothed difference signal as a chrominance signal motion detection signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A motion detector for a chrominance signal which is used with a TV receiver equipped with a video signal motion detector. This motion detector for a chrominance signal has a delay element for delaying the chrominance signal of a video signal by 1 frame period, a subtractor for subtracting the output signal of the delay element from the input signal thereof, an absolute value conversion circuit to which the output signal from the subtractor is inputted, and a smoother circuit to which the output signal from the absolute value conversion circuit is supplied. If the chrominance signals of video signals on two consecutive frames are the same, the output signal of the subtractor becomes zero. If the chrominance signals of video signals on two consecutive frames are different, the output signal of the substractor takes a positive or negative value. The negative value signal is converted into a positive value signal by the absolute value conversion circuit. A signal is outputted from the smoother circuit only when the chrominance signals of video signals on two consecutive frames are different. This outputted signal is a chrominance signal motion detection signal. The luminance signal contained in a video signal is removed from the video signal using a comb-type filter.
16 Citations
10 Claims
-
1. A motion detector for a chrominance signal for use with a TV receiver for detecting a motion of a chrominance signal contained in a video signal and generating a chrominance signal motion detection signal, comprising:
-
a first input terminal adapted to be supplied with a digitalized video signal containing a luminance signal and a chrominance signal; a frame memory connected to said first input terminal and supplied with said digitalized video signal from said first input terminal, for delaying said video signal by one frame period and generating a delayed video signal; a first comb-type filter including a first 1 horizontal period delay element and a first adder, connected to said first input terminal, and supplied with said digitalized video signal from said first input terminal, for removing a luminance signal contained in said digitalized video signal and selecting a first chrominance signal; a second comb-type filter including a second 1 horizontal period delay element and a second adder, connected to said frame memory, and supplied with said delayed video signal from said frame memory, for removing a luminance signal contained in said delayed video signal therefrom and generating a second chrominance signal; a subtracter connected to said first comb-type filter and said second comb-type filter, supplied with said first chrominance signal from said first comb-type filter and said second chrominance signal from said second comb-type filter, for generating a difference signal between said first and second chrominance signals; a first absolute value conversion circuit connected to said subtracter and supplied with said difference signal from said subtracter, for generating an absolute value difference signal; and a smoother circuit connected to said first absolute value conversion circuit and supplied with said absolute value difference signal from said first absolute value conversion circuit, for smoothing a digital difference signal and generating said smoothed difference signal as a chrominance signal motion detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification