Apparatus and method for detecting motion in a video signal
First Claim
1. A method for detecting motion in a video signal, the method comprising the steps of:
- identifying differences between a current image frame and a reference image frame;
calculating a difference profile representing the differences between the current image frame and the reference image frame; and
generating a motion detection signal if the difference profile exceeds a threshold.
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Accused Products
Abstract
A system detects motion in a video signal by identifying differences between a current image frame and a reference image frame. A difference profile is calculated that represents the differences between the current image frame and the reference image frame. A motion detection signal is generated by the system if the difference profile exceeds a threshold. In one configuration, the system replaces the reference image frame with each successive current image frame. In other configurations, the system replaces the reference image frame with the current image frame if the difference profile exceeds the threshold. The system generates difference data associated with the differences between the current image frame and the reference image frame. This difference data can be partitioned into multiple blocks. An average value is calculated for each block of difference data. Upon generation of a motion detection signal, the system may be configured to record the current image frame if the difference profile exceeds the threshold.
164 Citations
28 Claims
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1. A method for detecting motion in a video signal, the method comprising the steps of:
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identifying differences between a current image frame and a reference image frame; calculating a difference profile representing the differences between the current image frame and the reference image frame; and generating a motion detection signal if the difference profile exceeds a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A motion detector comprising:
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a digitizer coupled to receive a video signal and generate a current image frame; a storage device coupled to the digitizer and configured to store the current image frame and a reference image frame; a first circuit coupled to the storage device and configured to identify differences between the current image frame and the reference image frame; and a second circuit coupled to the first circuit and configured to generate a motion detection signal if a difference profile representing the differences identified by the first circuit exceeds a threshold. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A computer software product including a medium readable by a processor, the medium having stored thereon:
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a first sequence of instructions which, when executed by the processor, causes the processor to identify differences between a current image frame and a reference image frame; a second sequence of instructions which, when executed by the processor, causes the processor to calculate a difference profile representing the differences between the current image frame and the reference image frame; and a third sequence of instructions which, when executed by the processor, causes the processor to generate a motion detection signal if the difference profile exceeds a threshold. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A motion detector comprising:
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means for identifying differences between a current image frame and a reference image frame; means for calculating a difference profile representing the differences between the current image frame and the reference image frame; and means for generating a motion detection signal if the difference profile exceeds a threshold. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification