i REVIEWERS WANTED 1 Send your name and we'll send you a copy of the book. The Mental Representation of Grammatical Relations, Joan Br('~nan, Editor, MIT Press. Issues in the Implementation of Digital Feedback Compensators Paul Moron<a,, MIT Press. Although the title of Volume 2 suggests four sections, the book itself is divided into three major parts: Understanding Vision, Manipulation and Productivity Technology, and Computer Design and Symbol Manipulation. In the remainder of this review I will give a synopsis of each paper in Volume 2. Section I: Understanding Vision consists of six articles. The first three of those pursue the research direction led by late D. Marr. Marr's work attempts to understand vision in the context of biological systems. The rest of the articles in this section concentrate on B.K.P. Horn's research which is motivated by a need to understand how light is reflected from surfaces. [] D. Mart opens this section with this paper "Representing and Computer Visual Information." In this article (which is nearly 60 pages) Marr surveys work in vision from a perspective which attaches to the representation problems greater importance. An overall framework suggests the use of three levels of representation: the primal
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