Window detection

Details Window detection Window detection

2005-07-05

2005-07-05

Brier, Jeffery (Department: 2672)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S589000

Reexamination Certificate

active

06914611

ABSTRACT:
Apparatus for identifying the four coordinates of a window on a visual display monitor, include a device for obtaining digital data corresponding to pixels of an image to be displayed on the monitor, a memory arranged to receive the digital data, a comparator arranged to compare the values of data for horizontally and vertically adjacent pixels, a generator for generating a gradient value indicative of the difference in luminance of adjacent pixels—in the horizontal and in the vertical directions, a memory for storing the gradient values, a detector for detecting a unique configuration in the gradient values to identify the three coordinates of one edge of the window, and a device for checking in the direction perpendicular to the identified edge for a corresponding unique configuration, to determine the fourth coordinate of the window.

REFERENCES:
patent: 6535221 (2003-03-01), Allen et al.
patent: WO9921355 (1999-04-01), None
Foley et al., “Computer Graphics: Principles and Practice”, 1996, Addison-Wesley Publishing Company, Inc., pp. 585-586.
Shen, F. & Wang, H., “A lcal edge detector used for finding corners”, School of Electrical and Electronic Engineerin, Nanyang Technological University, Singapore.

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