Interpreting The Noise Power Spectra Of Digitally Printed Images

Phillip C. Bunch; Richard Van Metter

doi:10.1117/12.968726

27 June 1988 Interpreting The Noise Power Spectra Of Digitally Printed Images

Phillip C. Bunch, Richard Van Metter

Proceedings Volume 0914, Medical Imaging II; (1988) https://doi.org/10.1117/12.968726
Event: Medical Imaging II, 1988, Newport Beach, CA, United States

Abstract

Digital laser film printers are now being used as one means of obtaining hardcopy output of digitally acquired radiographic images. The noise characteristics of these devices are therefore of interest as part of the imaging chain in diagnostic radiology. We report measurements of the noise power spectrum (NPS) of nominally uniform fields written by a digital laser film printer. These measurements were made using conventional long-slit one-dimensional auto-spectral methods, as well as with cross-spectral methods applied to spatially registered images. The resulting spectra are significantly more complex than those generally estimated for uniformly exposed film. This complexity is manifested in the combination of narrow line and continuous spectral components, and in the highly anisotropic nature of the spectra. Simple models, such as the addition of one-dimensional periodic patterns and isotropic noise, do not adequately describe our data. We describe and illustrate by simulation four kinds of noise which might occur in digitally printed images. These can be distinguished in practice by the observed dependence of the NPS on slit and block length. Behavior consistent with all four kinds of noise is observed in our experimental data.

Citation Download Citation

Phillip C. Bunch and Richard Van Metter "Interpreting The Noise Power Spectra Of Digitally Printed Images", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); https://doi.org/10.1117/12.968726

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