Analog VLSI Implementation of Neural Systems by Christopher R. Carroll (auth.), Carver Mead, Mohammed Ismail

By Christopher R. Carroll (auth.), Carver Mead, Mohammed Ismail (eds.)

This quantity includes the complaints of a workshop on Analog built-in Neural structures held might eight, 1989, in reference to the foreign Symposium on Circuits and structures. The shows have been selected to surround the total variety of themes presently less than examine during this intriguing new self-discipline. Stringent popularity necessities have been put on contributions: (1) every one description was once required to incorporate precise characterization of a operating chip, and (2) each one layout used to be to not were released formerly. in numerous circumstances, the prestige of the undertaking was once now not identified till a couple of weeks prior to the assembly date. for this reason, probably the most fresh cutting edge paintings within the box was once provided. simply because this self-discipline is evolving quickly, every one undertaking is particularly a lot a piece in development. Authors have been requested to dedicate massive consciousness to the shortcomings in their designs, in addition to to the extraordinary successes they accomplished. during this manner, different employees can now steer clear of stumbling into a similar traps, and evolution can continue extra swiftly (and much less painfully). The chapters during this quantity are awarded within the similar order because the corresponding shows on the workshop. the 1st chapters are occupied with fmding recommendations to complicated optimization difficulties less than a predefmed set of constraints. the 1st bankruptcy stories what's, to the simplest of our wisdom, the 1st neural-chip layout. In every one case, the physics of the underlying digital medium is used to symbolize a value functionality in a usual method, utilizing purely nearest-neighbor connectivity.

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And Malik, J. (1988). A network for multiscale image segmentation. Proc. 1988 IEEE Int. Symp. on Circuits and Systems, Espoo, Finland, June, pp. 2565-2568. , Gamble, E. , and Little, J. J. (1988). Parallel integration of vision modules. Science 242:436-440. Poggio, T. and Koch, C. (1985). Ill-posed problems in early vision: from computational theory to analogue networks. Proc. R. Soc. Lond. B 226:303-323. , and Koch, C. (1985). Computational vision and regularization theory. Nature 317:314-319.

6. V (V) Figure 5 Measured I-V curves that show the effect of continuously varying from the saturating characteristic to that of the fuse curve. VB was set to 4V and VA was varied from OV to 2V. When VA = 0, the resulting I-V curve is identical to that of Mead's saturating resistor. the fuse I-V curve. Setting VA = 0 gives I A = 0 disabling the absolute-value circuit, and giving the fuse a saturating I-V relationship (Fig. 2B). Integration of the I-V curves in Fig. 5 gives the family of co-content curves shown in Fig.

We previously demonstrated a 48 by 48 pixel circuit implementing smooth surface interpolation (Luo, Koch and Mead, 1988). This work can be extended to include 2nd order or thin-plate surface interpolation (Harris, 1989), where the energy functional embodies the discretized square of the '\7 2 operator. Computer simulations have shown that detection of discontinuities in surface orientation, such as occurring along creases, is feasible in problems such as edge detection and surface interpolation (Blake and Zisserman, 1987; Liu and Harris, 1989) and can be incorporated into our thin-plate interpolation circuits (Harris, 1989).

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