High-Level Vision

Object Recognition and Visual Cognition

High-Level Vision

Shimon Ullman focuses on the processes of high-level vision that deal with the interpretation and use of what is seen in the image.

In this book, Shimon Ullman focuses on the processes of high-level vision that deal with the interpretation and use of what is seen in the image. Les mer
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High-Level Vision

Shimon Ullman focuses on the processes of high-level vision that deal with the interpretation and use of what is seen in the image.

In this book, Shimon Ullman focuses on the processes of high-level vision that deal with the interpretation and use of what is seen in the image. In particular, he examines two major problems. The first, object recognition and classification, involves recognizing objects despite large variations in appearance caused by changes in viewing position, illumination, occlusion, and object shape. The second, visual cognition, involves the extraction of shape properties and spatial relations in the course of performing visual tasks such as object manipulation, planning movements in the environment, or interpreting graphical material such as diagrams, graphs and maps.

The book first takes up object recognition and develops a novel approach to the recognition of three-dimensional objects. It then studies a number of related issues in high-level vision, including object classification, scene segmentation, and visual cognition. Using computational considerations discussed throughout the book, along with psychophysical and biological data, the final chapter proposes a model for the general flow of information in the visual cortex.

Understanding vision is a key problem in the brain sciences, human cognition, and artificial intelligence. Because of the interdisciplinary nature of the theories developed in this work, High-Level Vision will be of interest to readers in all three of these fields.

Object recognition: shape-based recognition; what is recognition? why object recognition is difficult. Approaches to object recognition: invariant properties and feature spaces; parts and structural descriptions; the alignment approach; which is the correct approach?. The alignment of pictorial descriptions: using corresponding features; the use of multiple models for 3-D objects; aligning pictorial descriptions; transforming the image or the models? before and after alignment. The alignment of smooth bounding contours: the curvate method; accuracy of the curvature method; empirical testing. Recognition by the combination of views: modelling objects by view combinations; objects with sharp edges; using two views only; using a single view; the use of depth values; summary of the basic scheme; objects with smooth boundaries; recognition by image combinations; extensions to the view-combination scheme; psychophysical and physiological evidence; interim conclusions: recognition by multiple views. Classifications: classification and identification; the role of object classification; class-based processing; using class prototypes; pictorial classification; evidence from psychology and biology; are classes in the world or in our head? the organization of recognition memory. Image and model correspondence: feature correspondence; contour matching; correspondence-less methods; correspondence processes in human vision; model construction; compensating for illumination changes. Segmentation and saliency: is segmentation feasible? bottom-up and top-down segmentation; extracting globally salient structures; saliency, selection, and completion; what can bottom-up segmentation achieve? Visual cognition and visual routines: perceiving "inside" and "outside"; spatial analysis by visual routines; conclusions and open problems; the elemental operations; the assembly and storage of routines; routines and recognition. Sequence seeking and counter streams - a model for visual cortex: the sequence-seeking scheme; biological embodiment; summary. Appendices: alignment by feature; the curvature method; errors of the curvature method; locally affine matching; definitions.

The book is not a review or textbook; it is more an idiosyncratic, personal history of Ullman's own thoughts and contributions to the field. But these contributions are so varied and

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