Evaluation of Direct-View Imaging Devices
Image-intensifier devices have traditionally been evaluated by a somewhat subjective estimate of performance in terms of output picture quality, particularly limiting resolution of the output image as seen by a human observer, as a function of input image illumination. To translate these subjective impressions into quantitative data, both to spectify tube performance objectively and to identify the factors which govern performance as a guide to corrective measures, workers have agreed on several quantitative measurements of image-intensifier performance. Most important are measurements which determine the sensitivity, in terms of the brightness gain and the contrast degradation in the device due to background,* and the resolution performance of the device. Following Perrin,1 we believe limiting resolution is completely unsatisfactory as a measure of resolution performance, and have standardized on the modulation transfer function to describe image-intensifier resolution performance.
KeywordsSpatial Frequency Test Pattern Modulation Transfer Function Image Intensifier Output Image
Unable to display preview. Download preview PDF.
- 2.D. H. MacRae and R. E. J. Halliday, “An 8 × 10 Transparency Illuminator for Television,” JSMPTE 75, 246–247 (1966).Google Scholar
- 3.Igor Limansky, “A New Resolution Chart for Imaging Systems,” The Electronic Engineer (June 1968).Google Scholar
- 4.W. L. Wilcock, in Advances in Electronics and Electron Physics, Vol. 22, Academic Press, New York (1966), p. 535.Google Scholar