Abstract
The Cramer-Rao Bound(CRB) analysis can be used in the transform parameters estimation of multi-scale object matching,and the noise estimation is of crucial importance since the CRB is very sensitive to the input noise.A group of high pass digital filters were constructed by several finite difference operators with different orders,and the image was processed with these operators and the variance was estimated separately from the filtered data with Inter-Quartile Range(IQR) method.Then,by median filter concept,noise variance was approximated by the median of the estimated variances.The supposed approach to noise estimation is simple and effective,which has been verified by the experiments.
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