Abstract
A 10-bit or 12-bit gray scale is provided in commercial laser film digitizers. The true contrast resolution on the digitized image within a laser spot area of 200 μm in diameter is limited by both the quantum mottle and instrumentation noise. In this report, we investigated the mean value, standard deviation, and adjacent pixel correlation coefficient on a calibrated step wedge film with two laser digitizers. The results were disappointing, because we found that the evaluated contrast information is inferior to the manufacturers’ specifications. On the output side, the brightnesses of different gray levels from a clinical monitor were measured with a narrow angle luminance probe and evaluated by a brief human perception study. In addition, the implications for teleradiology applications are discussed.
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Supported in part by the US Army Medical Research Acquisition Activity, Contract No. DAMD 17-86-C-6145.
The views, opinions, and/or findings contained in this document are those of the authors and should not be construed as an official Department of Army position, policy, or decision unless so designated by other documentation.
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Lo, SC.B., Gaskill, J.W., Mun, S.K. et al. Contrast information of digital imaging in laser film digitizer and display monitor. J Digit Imaging 3, 119–123 (1990). https://doi.org/10.1007/BF03170571
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DOI: https://doi.org/10.1007/BF03170571