Avid Technology Limited

Synapix, Inc.

Cadence Design Systems, Inc.

Philip R Moorby

John Stoddard Robotham

Philip Mason

Jean-Pierre Schott

Paul B Madden

Paul DiLascia

A method for feature tracking across a plurality of related image frames by developing a dense array of features and their paths as a deformable, regularly spaced grid, with vectors for each nodal feature point in the grid being derived through a process related to optical flow. The resulting dense feature array can be applied to techniques such as tracking two-dimensional shapes across frames, estimating three-dimensional paths of selected feature points, estimating three-dimensional camera paths from multiple feature points, or recovering estimated three-dimensional scene structure (including estimated depths of object surfaces) from feature tracking data.

Feature tracking using a dense feature array

A technique for converging upon a computer-based model of a real world or synthetic scene. The computer model makes use of abstraction-based data objects as well as image-based data objects. A correlation mesh provides links between related image-based and abstraction-based objects. An initial step in a process analyzes an input image stream and user inputs to derive initial image-based objects and abstraction-based objects for the scene model. Subsequent steps in the process allow user inputs to refine the image-based objects, abstraction-based objects and/or the correlation mesh. As a result, refinements to the image-based object model of the scene can improve the abstraction-based model of the scene, and refinements to the abstraction-based object model can improve the image-based model.

Adaptive modeling and segmentation of visual image streams

A computer system, having a graphical user interface for authoring and playing a multimedia presentation having one or more multimedia events, displays a representation of a story, including a representation of a start position, indicating the beginning of the multimedia presentation, a representation of an end position, indicating the end of the multimedia presentation, and a representation of a unidirectional path line connecting the start position and the end positions. The representation of at least one icon, associated with a source of multimedia material, may be linked to the path line. The link, called a call spot, represents a call to the multimedia, allowing icons to be shared by many presentations or to be shown at different times in the same presentation. The multimedia presentation starts at the start position, plays the multimedia material represented by the at least one icon, and then continues along the unidirectional path line and completes at the end position.

Computer system for authoring a multimedia composition using a visual

Icon for a display screen

The method and apparatus for generating a reference video sequence of images includes performing a grid analysis of each of the frames of the video sequence, assigning a color value to that frame, calculating the difference in total color value between frames in the video sequence, establishing a threshold value for transitions and dropping those frames whose transitions from frame to frame are below the threshold value. The reference video analysis may be performed on a single user system or over a network system including a number of workstations.

Method and apparatus for compressing and analyzing video and for

Disclosed is a system and method for simulating and detecting timing errors in digital circuit designs. The system consists of a logic simulator connected to various storage registers, a sequencer, and a randomizer, for simulating component functionality within the digital circuit design at sequential time increments using stored parametric data. The method includes selecting, for each component in a digital circuit design, a specific timing constraint from a range of possible timing constraint values, using a psuedo-random selection algorithm. The digital circuit is then simulated through a number of periods using this timing constraint. When an adequate number of periods have been simulated, a new set of timing constraints are selected. Timing requirement violations are detected and reported to a user.

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Boxford, MA, United States of America

Philip R Moorby