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The denominator in the above two expressions is the normalizing factor and is often omitted (as in Wiener filtering). When normalized, a crosscorrelation of 1 indicates a perfect match, values near zero indicate very little correlation, and negative values indicate that one of the wavelets is inverted. Normalized crosscorrelation is also called correlation coefficient. See also autocorrelation. Nonnormalized crosscorrelation can be accomplished by reversing one function in time and convolving: