Adaptive frame comb filter system
First Claim
Patent Images
1. An adaptive frame comb filter system for comb filtering video signals, comprising:
- a source of video signals;
a frame comb filter coupled to said source for generating at a first output port, a first output signal corresponding to the sum of non-delayed and frame delayed signals, and generating at a second output port a second output signal corresponding to the difference of non-delayed and frame delayed signals;
means coupled to the second output port for extracting relatively low frequency interframe motion-induced signals and relatively high frequency interframe motion-induced signals;
means responsive to said relatively low frequency interframe motion-induced signals for generating a control signal on the occurrence of such signals;
means including means for combining said relatively low frequency and relatively high frequency interframe motion-induced signals with said first output signal to produce a substantially motion-corrected first output signal and including means responsive to said control signal for selectively coupling at least said relatively high frequency interframe motion-induced signals to said combining means only when said relatively low frequency motion-induced signals occur.
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Abstract
A frame comb filter system having circuitry to minimize motion-induced artifacts in the reproduced image includes a line comb filter to extract a relatively high frequency luminance correction signal from frame comb filtered chrominance signal. This luminance correction signal, however, includes undesirable signal components due to vertical chrominance transitions even in the absence of motion. The system therefore includes circuitry to selectively recombine the high frequency luminance correction signal with frame comb filtered luminance signal only when motion occurs.
60 Citations
11 Claims
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1. An adaptive frame comb filter system for comb filtering video signals, comprising:
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a source of video signals; a frame comb filter coupled to said source for generating at a first output port, a first output signal corresponding to the sum of non-delayed and frame delayed signals, and generating at a second output port a second output signal corresponding to the difference of non-delayed and frame delayed signals; means coupled to the second output port for extracting relatively low frequency interframe motion-induced signals and relatively high frequency interframe motion-induced signals; means responsive to said relatively low frequency interframe motion-induced signals for generating a control signal on the occurrence of such signals; means including means for combining said relatively low frequency and relatively high frequency interframe motion-induced signals with said first output signal to produce a substantially motion-corrected first output signal and including means responsive to said control signal for selectively coupling at least said relatively high frequency interframe motion-induced signals to said combining means only when said relatively low frequency motion-induced signals occur. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An adaptive frame comb filter system for separating chrominance and luminance components from a composite video signal, comprising:
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a source of composite video signal; a frame comb filter having a luminance output port and a chrominance output port; a low-pass filter coupled to said chrominance output port, having an output port and having a transfer function which attenuates a signal having frequencies in the range of frequencies normally occupied by the chrominance signal; an interline comb filter having an input port coupled to said chrominance output port and having an output port from which a signal occurring in the spectral bands normally occupied by the luminance signal is available; a detector coupled to said low-pass filter for generating a control signal when signal produced from said low-pass filter exceeds a predetermined level; signal combining means having a first input port coupled to said luminance output port, having a second input port, and having an output port at which substantially motion-corrected luminance signal is available; and multiplexing means responsive to said control signal for coupling the output port of said interline comb filter to the second input port of said signal combining means and coupling a zero-valued reference thereto in the absence of said control signal. - View Dependent Claims (8, 9, 10, 11)
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Specification