Image analysis – Image enhancement or restoration
Reexamination Certificate
2011-06-28
2011-06-28
Desire, Gregory M (Department: 2624)
Image analysis
Image enhancement or restoration
C348S143000, C348S578000, C382S103000, C382S199000, C382S203000
Reexamination Certificate
active
07970229
ABSTRACT:
Methods and apparatus are provided for visual background subtraction using one or more preprocessing modules. One or more effects are detected in a received image signal and one or more blocks are selectively enabled to preprocess the image signal to compensate for the detected one or more effects. Visual analysis is then performed on the preprocessed signal using background subtraction. A spatially-variant temporal smoothing of the image signal is also disclosed. The spatially-variant temporal smoothing can be achieved by the mixing of a new intensity value with a previous intensity time-average as determined by a weighting matrix. The mixing can be influenced by a dynamic bias term that is a real-time estimate of a variance at the pixel, such as a degree of change, and the weighting can be determined by a relative stability of an observed value compared to a stability of the time-average.
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Desire Gregory M
International Business Machines - Corporation
Ryan & Mason & Lewis, LLP
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