Restauration of Defocussed Images of Glass/Water-Edges and Chromium/Glass-Edges in Scanning Acoustic Microscopy (SAM)
The following experiments will show the effect of linear filter processing on scanning acoustic micrographs controlled by Linfoot image quality criteria. For calculation micrographs of a glass/water-edge (amplitude object) and a chromium-on-glass-edge (phase object) were taken at defocusses of z=0 to z=-95 µm in 5µ steps by a Leitz ELSAM using a 400 MHz lens without V(z) effect. It will be shown that image processing in SAM is successfull and that the results are in agreement with a discussion of Linfoot image quality criteria.
KeywordsPoint Spread Function Digital Image Processing Fourier Plane Phase Filter Optical Transfer Function
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- H. Block, G.Heygster, S.Boseck, Determination of the OTF of a reflection scanning acoustic microscope (SAM) by a hair crack in glass at different ultrasonic frequencies, Optik 82, 4 (1989) 147 – 154Google Scholar
- E. Reuber, W. Kunath, H.Block, B. Schmidt, S. Boseck, Improvements in the use of synthetic holograms for high resolution micrographs of a 100 kilovolt electron microscope, Scanning Microscopy Supplement 2 (1988), 68 – 70Google Scholar
- X. Shen, S. Boseck, Description of Elastic Discontinuities with the SAM 19th International Symposium on Acoustical Imaging, April 3–5, 1991, Bochum, GermanyGoogle Scholar