Naresh C Gupta

US Patent:

60725028, Jun 6, 2000

Filed:

Jun 25, 1997

Appl. No.:

8/882695

Inventors:

Naresh C. Gupta - Santa Clara CA

Assignee:

Adobe Systems Incorporated - San Jose CA

International Classification:

G06T 1120

US Classification:

345442

Abstract:

A system determines discontinuities on a drawn curve. Local tangent values for a curvilinear segment are generated by determining the most likely tangent value for all points on the segment and by acting on a sampling of points around the current point whose tangent is to be determined. A robust statistical estimator is then applied to all angle values generated for the sample set to determine the likely intended tangent direction of the current focal point. The system then selects points with significant changes in tangent values to determine curve discontinuities such that the corners of the segment can be derived.

US Patent:

60258500, Feb 15, 2000

Filed:

Mar 28, 1997

Appl. No.:

8/829447

Inventors:

Naresh C. Gupta - Santa Clara CA

Assignee:

Adobe Systems Incorporated - San Jose CA

International Classification:

G06T 1100
G09G 508

US Classification:

345442

Abstract:

A computer-implemented method identifies a boundary path of an object in a displayed raster image by sampling user input to define cursor positions in the raster image and to determine tunnel width parameters corresponding to the cursor positions. The boundary path is identified by applying a cost function that evaluates pixel values of pixels the raster image within limits defined by the tunnel width parameters and determines pixels defining the boundary path.

US Patent:

61009040, Aug 8, 2000

Filed:

Jun 25, 1997

Appl. No.:

8/882692

Inventors:

Naresh C. Gupta - Santa Clara CA

Assignee:

Adobe Systems Incorporated - San Jose CA

International Classification:

G06F 1724

US Classification:

345442

Abstract:

A system generates a smoothed curve from a noisily drawn, multi-segmented curve by solving a smoothing function for a transposed curve which fits between end-points of the drawn curve. The transposed curve has an energy value related to the length of the transposed curve. The energy value has two components: a distortion factor and a smoothing factor. Numerical analysis methods are applied to evaluate the smoothing function and to identify the transposed curve with the lowest energy. The transposed curve with the lowest energy value is selected as the smoothed curve.