With regard to the groundbreaking contributions made by Kak and his collaborators: In 1989, Chen and Kakpublished 3D-POLY that is still the fastest algorithm for recognizing 3D objects in depth maps. In 1992, Kosaka and Kak published FINALE, which is considered to be a computationally efficient and highly robust approach to vision-based navigation by indoor mobile robots. In 2003, a group of researchers that included Kak developed a tool for content-based image retrieval that was demonstrated by clinical trials to markedly improve the performance of radiologists. This remains the only clinically evaluated system for content-based image retrieval for radiologists.

A talk by Avinash Kak (available as a PDF file) that is making the rounds on the internet is titled (provocatively/amusingly) Why Robots Will Never Have Sex. This talk is supposed to be a rejoinder to those who believe that robots/computers will someday take over the world.[1]

The SART algorithm (Simultaneous Algebraic Reconstruction Technique) proposed by Andersen and Kak in 1984 has had a major impact in CT imagingapplications where the projection data is limited. As a measure of its popularity, researchers have proposed various extensions toSART: OS-SART, FA-SART, VW-OS-SART, SARTF, etc. Researchers have also studied how SART can best be implemented ondifferent parallel processing architectures. SART and its proposed extensions are used in emission CT in nuclear medicine, for dynamic CT, for holographic tomography, etc. Convergenceof the SART algorithm was theoretically established in 2004 by Ming Jiang and Ge Wang in their paper "Convergence of the simultaneous algebraic reconstruction technique (SART)" published in the IEEE Transactions on Image Processing, Vol. 12, August 2003, pp. 957—961.

His book Principles of Computerized Tomographic Imaging, now re-published as a classic in Applied Mathematics by SIAM (Society of Industrial and Applied Mathematics), is widely used in courses dealing with modern medical imaging. It is one of the most frequently cited books in the literature on image reconstruction. His other co-authored book Digital Picture Processing is also considered to be a classic and has been one of the most widely referenced sources in literature dealing with digital image processing and computer vision. (The citation counts atGoogle Scholar [2]show how frequently these classics are citedin the technical literature.)

His more recent books are a part of his Object Trilogy Project[3] The first book of the trilogy,Programming with Objects: A Comparable Presentation of Object-Oriented Programming with C++ and Java, presents a comparative approach to the teaching and learning of two large object-oriented languages, C++ and Java. The second book, Scripting with Objects: A Comparative Presentation of Object-Oriented Scripting with Perl and Python, does the same with Perl and Python. The last, Designing with Objects is presumably currently in the works.