Cognex Corporation

Oracle America, Inc.

Jane Alice Loizeaux

Nigel John Foster

James H Waldo

Yian Leng Chang

Daniel Joseph Ellard

Robert F Sproull

Michael P Warres

Timothy J Blackman

Keith Benjamin Thompson

Location-independent references include a live reference containing a location of a remote object and a universally unique identifier (UUID) which provides a unique global reference to that remote object. If a method call to the remote object using the live reference fails, the UUID is used to obtain a new reference to the remote object and the new reference is then used to make another method call. A new reference can be obtained from an identifier directory that contains a mapping between UUIDs and location-independent references. When a remote object is first created, or when a remote object is moved from one location to another, the remote object registers with any and all such directories that it can find in its environment. These registrations are leased; that is, if they are not occasionally refreshed by the remote object which registered them, they are dropped from the directory.

Method and apparatus for generating and using location-independent distributed object references

In at least one embodiment, an apparatus for determining one or more affinity groups in a distributed network is provided. A first distributed computing device is operably coupled to a plurality of clients for enabling electronic interactive activities therebetween. The first distributed computing device is configured to detect at least one network interaction among the plurality of clients. The first distributed computing device is further configured to generate at least one weighted value based on the number of detected network interactions. The first distributed computing device is further configured to establish an affinity group comprising at least one client from the plurality of clients based on the at least one weighted value.

System and method for determining affinity groups and co-locating the affinity groups in a distributing network

A ball grid array inspection and location method and apparatus includes a raw feature finding processor which uses a feature finding algorithm to find ball features (irrespective of number) and generate a list of raw features as an X and Y location for each feature located. An angle estimation processor receives the list of raw features, a user estimated orientation angle, and ball-to-ball pitch information and determines an estimated grid angle. An on-grid check processor receives the estimated grid angle, the list of raw features and the ball-to-ball pitch information and produces a set or list of on-grid features in the form of a list X and Y translation parameters for each feature/ball found on-grid. A correspondence processor receives the list of on-grid features and model grid information and searches for correspondence between the two dimensional array of found grid features and the two dimensional array of model grid features to yield a direct mapping of respective two dimensional spatial relationships between model features and found features, which is used to determine the spatial relationship between model space and physical space in order to position/align balls of the device in physical space in accordance with model balls in model space. A least square fit is effected to refine position of the device in terms of its translation and rotation.

Method and apparatus for locating ball grid array packages from two-dimensional image data

Method and apparatus for locating ball grid array packages from

The invention provides a two-phase method for identifying sets of collinear points in data points, e.g., derived from an image. During a first phase, the 'angle-finding' phase, the angular orientation of the lines defined by the sets of points is estimated. During a second phase, the 'line-finding' phase, sets of collinear points aligned at that angle are identified. The invention has application, for example, in finding parallel and perpendicular point sets in an image.

Machine vision methods for identifying collinear sets of points from an

Growing community of inventors

Lowell, MA, United States of America

Jane Alice Loizeaux