An extended method and system to estimate noise variancestandard deviation from a video sequence

摘要

An extended method and an extended system for estimating noise variance(standard deviation) from a video sequence are provided to remove an image structure by calculating a local difference if movement does not exist or little movement exists between two continuous frames, thereby acquiring a substantial estimation result. A method for estimating a video noise comprises the following steps of: calculating temporal local statistics of a current frame and the past filtered frame; estimating distribution of the temporal local statistics; and estimating the video noise from the estimated distribution. The above step includes the following steps of: calculating noise standard deviation as a function of the estimated distribution; and calculating noise variance as a function of the estimated distribution.