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1 January 1987 A Cross-Power Spectral Method For Improved Measurement Of Film Noise Power Spectra
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A cross-power spectral method is described for the separation of the scanning system noise spectrum from the film noise spectrum in a film measuring system. This method provides a more accurate way to measure the true film noise spectrum. The spectral separation is done in two steps: (1) Two samples are taken at each sample position on the film to produce a pair of independently sampled data arrays. (2) The cross-power spectrum is then computed from this pair of arrays using the fast Fourier transforin(FFT) technique. Since film noise and scanner noise are uncorrelated, it is shown that this cross-power spectrum is an estimate of the film noise spectrum. The use of this technique is demonstrated using simulated film data.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Y. Lee and P. L. P. Dillon "A Cross-Power Spectral Method For Improved Measurement Of Film Noise Power Spectra", Proc. SPIE 0767, Medical Imaging, (1 January 1987);


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