Rationalizing the coefficients of popular biorthogonal wavelet filters

Many wavelet filters found in the literature have irrational coefficients a nd thus require infinite precision implementation. One of the most popular filter pairs is the "9/7" biorthogonal pair of Cohen, Daubechies, and Feauv eau, which is adopted in the FBI finger-print compression standard. We pres ent here a technique to rationalize the coeffcients of wavelet filters that will preserve biorthogonality and perfect reconstruction. Furthermore, mos t of the zeros at z = -1 will also be preserved. These zeros are important for achieving regularity. The rationalized coefficients filters have charac teristics that are close to the original irrational coefficients filters. T hree popular pairs of filters, which include the "9/7" pair, will be consid ered.