1 July 1990 Line illumination system and detector for film digitization
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Abstract
A film digitizer employing a linear CCD imager can provide substantial performance improvements over a flatbed or drum scanner by measuring many film pixels simultaneously. If it is required, however, to retain the full quality of the image on the film, careful design of the illumination system, optics, and electronics is important. This paper will describe the application of a diffuse illumination system and a three-color CCD imager in a high-resolution film digitizer. The imager provides up to 8000 pixels per scan line and dynamic range (peak signal-to-darknoise) of 5000. This technology permits use of a novel means for holding the film, simplifying the task of mounting the film on the scanner. A brief description will be given of the analog electronics, digital electronics, and software procedures used to convert raw CCD output to accurate film density.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James R. Milch, James R. Milch, } "Line illumination system and detector for film digitization", Proc. SPIE 1242, Charge-Coupled Devices and Solid State Optical Sensors, (1 July 1990); doi: 10.1117/12.19455; https://doi.org/10.1117/12.19455
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