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An adaptive order-statistic noise filter for gamma-corrected image sequences

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3 Author(s)
Kleihorst, R.P. ; Philips Res. Lab., Eindhoven, Netherlands ; Lagendiik, R.L. ; Biemond, J.

Original video signals are often corrupted by a certain amount of noise originating from the camera electronics. As a result of the gamma correction in cameras, the observed noise is signal dependent. We present a spatio-temporal order-statistic (OS) noise filter that takes into account the gamma correction in the camera. The calculation of the filter coefficients requires higher-order order-statistics (HOOS) of the noise process. We make use of a range test (RT) to determine locally from which neighboring signal values an estimate should be formed. The noise filter that we arrive at is adaptive and computationally efficient

Published in:

Image Processing, IEEE Transactions on  (Volume:6 ,  Issue: 10 )