Digitizing And Interfacing Of Nondigital Images

Norman A. Baily

doi:10.1117/12.967657

14 January 1982 Digitizing And Interfacing Of Nondigital Images

Norman A. Baily

Proceedings Volume 0318, 1st Intl Conf and Workshop on Picture Archiving and Communication Systems; (1982) https://doi.org/10.1117/12.967657
Event: 1st International Conference and Workshop on Picture Archiving and Communication Systems, 1981, Newport Beach, United States

Abstract

In discussing analog or non-digital images it is important to recognize that all images are generated by an interaction between quanta (either light, x or gamma rays, etc.) or particulate radiations, and a substance capable of responding to the interaction of these rays and that substance in such a way that an image can be generated. The intensity of the primary radiation and its spatial variation will then reflect the object being imaged. Therefore, the real difference between a digitized and an analog image lies in the method of recording this data. Many of the systems classified as digital make use of first-stage analog devices from which information is extracted and then transformed to a digitized format. In this paper we will discuss images which have not undergone such a transformation and which have been stored in analog form by an analog storage device. Such storage devices are usually photographic film, video disk, or video tape. It is from these analog storage media that subsequent digitization and/or processing by computer takes place. The choice of the methods of recording and digitization can greatly influence the signal to noise level and therefore the precision and accuracy of the computed results whether expressed as an image or in terms of numbers. Commonly used are video cameras, laser scanners, and photo-electronic scanners. The signal to noise level capabilities of these digitization modalities also influence both spatial and gray level resolutions achievable. In the case of radiological imaging most applications utilizing digitization have involved the use of video. The use of video for such applications has been reviewed recently.' In this paper we shall restrict our discussion to this modality.

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Norman A. Baily "Digitizing And Interfacing Of Nondigital Images", Proc. SPIE 0318, 1st Intl Conf and Workshop on Picture Archiving and Communication Systems, (14 January 1982); https://doi.org/10.1117/12.967657

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KEYWORDS

Video

Analog electronics

Spatial resolution

Calibration

Diagnostics

Telecommunications

Image resolution

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