Abstract
Recently it has become clear that a high resolution electron microscope (H.R.E.M.) can be controlled by a computer which "sees" the image via a TV camera connected to a digital framestore, and which "adjusts" the microscope imaging parameters via a D/A (Digital/Analog) control interface so as to optimize the image. The question therefore arises whether it will some day be possible to replace human microscope operators with inexpensive minicomputers capable of performing all the traditionally human tasks, but with much greater precision, repeatability, and speed.Fig. 1 shows a schematic of the computer control system for a JEM 200CX HREM under development at ASU. The TV camera is coupled via a 2:1 reducing fibre- optics bundle to a P22 phosphor screen as described previously. The DeAnza framestore has enough memory for up to four 512x512x8 bit images, and can perform various simple operations such as adding or subtracting two images at TV rates (on-line).
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