I review the Liskov and Wing subtype deenition that takes into consideration the problem of subtyping in the presence of mutable objects. I then show how this notion of subtyping is relevant to the design of the TOM object repository whose main application today is a data type conversion service accesssible through the Web.

The Extended Gaussian Image (EGI) of an object records the variation of surface area with surface orientation, uniquely representing convex objects. The inversion problem for polyhedra (from an EGI to a description in terms of vertices and faces) has been solved, by an iterative algorithm [Little, 1983]. The algorithm depends upon the mixed volume, a geometric construction linking the areas and...

In this paper, based on the possibility distribution and semantic measure of fuzzy data, an extended object-oriented database model to handle imperfect as well as complex object in the real-world is introduced. Some major notions in object-oriented databases such as objects, classes, object-classes, relationships, subclass/superclass and multiple inheritances are extended under fuzzy informatio...

In this paper, a novel image moments based model for shape estimation and tracking of an object moving with a complex trajectory is presented. The camera is assumed to be stationary looking at a moving object. Point features inside the object are sampled as measurements. An ellipsoidal approximation of the shape is assumed as a primitive shape. The shape of an ellipse is estimated using a combi...

Visual appearance of natural objects is profoundly affected by viewing conditions such as viewpoint and illumination. Human subjects can nevertheless compensate well for variations in these viewing conditions. The strategies that the visual system uses to accomplish this are largely unclear. Previous computational studies have suggested that in principle, certain types of object fragments (rath...

We present a model-based object recognition metric integrated with the control system of a mobile robot. The metric draws on the information-theoretic framework of string processing. Object models and images are viewed as sequences of binary strings whose local pairwise similarities contribute to global matches. We present and analyze the results of evaluating the metric on several trash collec...

An OO designer typically starts with a high-level idea of the interactions between the key objects in the system. As the design progresses, the designer refines these interactions by identifying the exact operations of each object that other objects will invoke and the order of invocations, or by introducing new objects with appropriate operations to mediate the required interactions between ex...