Software pattern recognition applied to nanodiffraction patterns from a STEM instrument

Author(s):  
G.Y. Fan ◽  
J.M. Cowley

In recent developments, the ASU HB5 has been modified so that the timing, positioning, and scanning of the finely focused electron probe can be entirely controlled by a host computer. This made the asynchronized handshake possible between the HB5 STEM and the image processing system which consists of host computer (PDP 11/34), DeAnza image processor (IP 5000) which is interfaced with a low-light level TV camera, array processor (AP 400) and various peripheral devices. This greatly facilitates the pattern recognition technique initiated by Monosmith and Cowley. Software called NANHB5 is under development which, instead of employing a set of photo-diodes to detect strong spots on a TV screen, uses various software techniques including on-line fast Fourier transform (FFT) to recognize patterns of greater complexity, taking advantage of the sophistication of our image processing system and the flexibility of computer software.

1993 ◽  
Author(s):  
Zebin Wei ◽  
Huien Zhang ◽  
Min Zhou ◽  
Yisong Zou ◽  
Shanfeng Hou

Author(s):  
William Krakow ◽  
R.A. Baron

A time shared television digital image processing system has been developed for on-line electron microscopy and uses a large mainframe computer (IBM 3033). The system consists of a TV frame store (Grinnell GMR275 full color processor) capable of storing five-512x512x8 bit deep monochrome pictures and four-5 12x512x1 bit graphic overlays. The frame store has many standard features such as: an an 8 bit video digitizer, zoom and pan controls, graphic cursors, image analyzers, arithmetic and boolean processors, alpha numeric generators, lookup tables and so on. A high speed interface has been developed to connect between the host computer and the frame store and can bidirectionally transmit data at 1 Mbit/sec rates over coaxial cable (see Fig. 1). The processor can be controlled from any terminal within the research center. At present a digital switch box has been constructed which will allow up to ten video inputs to be individually assessed from microscopes at remote sites. Also, up to ten full color video ouputs (RGB) from the processor are switchable under computer control.


2000 ◽  
Vol 48 (8) ◽  
pp. 1154-1159 ◽  
Author(s):  
Satoru WATANO ◽  
Tetsuya NUMA ◽  
Kei MIYANAMI ◽  
Yoshifumi OSAKO

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