Motion detection apparatus
AssigneesSanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
InventorSatoyuki Ishii
Life of this patent
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Abstract
A motion detection apparatus which extracts a 1-frame differential signal from a video signal, separates the 1-frame differential signal into a vertical low frequency signal having a frequency which is lower than a predetermined frequency with respect to the vertical direction of a frame of the video signal and a vertical high frequency signal having a frequency which is equal to or higher than the predetermined frequency, separates, from the vertical low frequency signal and the vertical high frequency signal, signals having different frequency bands with respect to the horizontal direction of a frame of the video signal, respectively, and combines these separated signals.
Claims9
A motion detection apparatus, comprising:
- a video signal;
- a frame delay unit which delays the video signal by one frame;
- a subtractor which outputs a difference between the video signal and the video signal which is delayed in the frame delay unit;
- a first vertical frequency filter which separates and outputs, from a signal output from the subtractor, a predetermined frequency band with respect to a vertical direction of a frame of the video signal;
- a second vertical frequency filter which separates and outputs, from a signal output from the subtractor, a frequency band which is lower than the predetermined frequency band of the first vertical frequency filter with respect to the vertical direction of a frame of the video signal;
- a first horizontal low pass filter which separates and outputs, from a signal output from the first vertical frequency filter, a predetermined frequency band with respect to a horizontal direction of a frame of the video signal;
- a second horizontal low pass filter which separates and outputs, from a signal output from the second vertical frequency filter, a frequency band which is broader than the predetermined frequency band of the first horizontal low pass filter with respect to the horizontal direction of a frame of the video signal;
- and a combiner unit which combines the signal output from the first horizontal low pass filter and the signal output from the second horizontal low pass filter and outputs a combined signal.
A motion detection apparatus, comprising:
- a video signal;
- a frame delay unit which delays the video signal by one frame;
- a subtractor which outputs a difference between the video signal and the video signal which is delayed in the frame delay circuit;
- a first vertical frequency filter which separates and outputs, from a signal output from the subtractor, a predetermined frequency band with respect to a vertical direction of a frame of the video signal;
- a second vertical frequency filter which separates and outputs, from a signal output from the subtractor, a frequency band, which is lower than the predetermined frequency band of the first vertical frequency filter with respect to the vertical direction of a frame of the video signal;
- a first horizontal low pass filter which separates and outputs, from a signal output from the first vertical frequency filter, a predetermined frequency band with respect to a horizontal direction of a frame of the video signal;
- a second horizontal low pass filter which separates and outputs, from a signal output from the second vertical frequency filter, a frequency band which is broader than the frequency band of the first horizontal low pass filter with respect to the horizontal direction of a frame of the video signal;
- a first nonlinear transform unit which nonlinearly transforms the signal output from the first horizontal low pass filter;
- a second nonlinear transform unit which nonlinearly transforms the signal output from the second horizontal low pass filter;
- and a combiner unit which combines the signal output from the first nonlinear transform unit and the signal output from the second nonlinear transform unit and outputs a combined signal.
Dependencies are inferred from the claim text.