Optical shaft encoder unit G D B addresses up to 8 Mbyte

An optical shaft encoder for OEM applications has been launched by BEI Motion Systems. The Model Ml 5 IS, according to UK distributor Muirhead Vactric, the first .optical shaft encoder to be made available in modular form.

Unlike conventional kit-form types, constructed using shims, set screws and epoxies and then aligned with an oscilloscope, the Ml 5 is completely self-contained with no separate photohead, disc-hub assembly or cover. It can be fitted, claims Muirhead, in less than 1 min and needs no alignment.

Standard bore sizes range from 0.1 25 in to 0.5 in (imperial) and 5 mm to 10 mm (metric) with nonstandard sizes available. Reliable performance is claimed over the temperature range 0-80°C. (BEI Motion Systems Co., 1755B

Video memory up to 8 Mbyte may be addressed by the EF68483 graphic display processor (GDP).

The processor, scheduled by Thomson for UK release this June, will be bus compatible with 68000, 68008, 8086 and 8088 microprocessors.

The device is designed to address 16 pages of 2048 x 2048 pixels, arranged as four banks of four pages. Two banks are for colour bit maps, one for character generation and the fourth for marking

M 15 optical shaft encoder purposes. The drawing and other graphics

Costa Meadows Drive, San commands available include

Marcos, CA 92069, USA. UK vector, arc, circle, line pattern,

distributor.. Muirhead Vactric programmable pixels (4- or 8-bit)

Components L td, 154 Croydon and filtering. (Thomson Ltd. Road. Beckenham. Kent BR3 4DE. Rinawav House, Bell Road, Danes UK. Tel: Or-650 4888. Telex., 27796 Murvac G) 0

:9 ACADEMIC PRESS .@

COMPUTING STRUCTURES FOR IMAGE PROCESSING M.J.B. Duff 19X.7. 232/,p.. $3.~.OOlf22.00 (UK only), ISBN: 0.12.223340.9

This collection of papers was presented at a workshop on Multicomputers and Image Processing held in Abingdon, England in May lYX2. The book, like the workshop, is devoted to a review and evaluation of new architectures, algorithms and applications of new systems for image processing. Its aim is to compare and assess some of the new image processing methodologies currently being developed and to provide an up to date summary of recent research in the field.

CONTENTS: A Surgery of Bit-Serial Array Processor Circuits, T.J. Fountain. A Comparison of the CLlP4, DAP and MPP Processor- Arrrry ImpI~~mc~r7trrtion.s. F.A. Gerritsen. Parallel Architectures Adapr- ed IO In7rrgc Processing. and their Limits, J.-L. Basille, S. Castan, and M.A. Razz. Towards an Evaluation of utl Imuge Processing System, V. Cantoni, C. Guerra, and S. Levialdi. lmuge Processing-Its Milieu, Ifs Nature, and Corwtraints 017 the Design of Special Architectures for its Implc~mc~r~tutir,rl. E.R. Davies. Faull Tolerunce in Highly Parallel Mesh Cot7r7rc~tctl Prowssor.~, A.P. Reeves. Pyramid Multi-Computer Struc- /urr.s. and Aqmenred l’yramid.s, L. Uhr. Inteructive Image Processing in a Multi- liser Environment, R.P.W. Duin. Algorithms for Median Filtering of In7uge.s on a l’vramid Machine, S.L. Tanimoto. VA P - An Array Processor A rchirecrure Using Cu.ccuded Look- Up Tables, Hj. Keller, A. Favre, and A. Comazzi. LlPP- Proposa1.s for the Design of an Image Prowssor Arruy, P.E. Danielsson and T. Ericsson. The Diff4: A Second (;cnertriion Slide Analy.ver. M.D. Graham. Progress in Image Prow\ tiny f,anguagcs, K. Preston, Jr. Index. ,‘rr< c, wh,<,c, 10 < ha,r,q:p wi~h,ml Tao,,< c

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96 image and vision computing