Scene Dependent Resolution In Digital Imaging Systems

N. Ramanathan

doi:10.1117/12.933067

4 November 1981 Scene Dependent Resolution In Digital Imaging Systems

N. Ramanathan

Proceedings Volume 0314, Digital Radiography; (1981) https://doi.org/10.1117/12.933067
Event: Conference on Digital Radiography, 1981, Palo Alto, United States

Abstract

An imaging system resolution is characterized usually by the Point Spread Function (PSF) and less stringently by a Line Spread Function (LSF). Since no practical system can realize a widthless PSF, such as a Dirac Delta Function, the neighbouring pixels contribute to the grey level of the pixel in question. Then it follows that the contrast in any pixel is modulated by the sum of components of the grey level of the adjacent pixels, the degree of modulation depending on the nature of the PSF and the grey level of the surrounding pixels. Consequently, the system resolution is scene dependent and hence, to some degree, specific to a clinical procedure. Clinical significance of this approach is indicated. Causes of scene dependent artefacts are considered. Method of estimation of this effect in digital imaging systems is suggested. The implications to the choice and application of the electronic imaging system chain, on the basis of the scene dependent component analysis, are discussed. The consequences of this component to digital image subtraction procedures are outlined.

Citation Download Citation

N. Ramanathan "Scene Dependent Resolution In Digital Imaging Systems", Proc. SPIE 0314, Digital Radiography, (4 November 1981); https://doi.org/10.1117/12.933067

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