Detecting visual gestural patterns

Abstract

A processing device and method are provided for capturing images, via an image-capturing component of a processing device, and determining a motion of the processing device. An adaptive search center technique may be employed to determine a search center with respect to multiple equal-sized regions of an image frame, based on previously estimated motion vectors. One of several fast block matching methods may be used, based on one or more conditions, to match a block of pixels of one image frame with a second block of pixels of a second image. Upon matching blocks of pixels, motion vectors of the multiple equal-sized regions may be estimated. The motion may be determined, based on the estimated motion vectors, and an associated action may be performed. Various embodiments may implement techniques to distinguish motion blur from de-focus blur and to determine a change in lighting condition.

Description

[0001]This application is a continuation application of, and claims the benefit of priority under 35 U.S.C. §120 to, copending U.S. patent application Ser. No. 11 / 859,800, filed in the U.S. Patent and Trademark Office on Sep. 24, 2007.BACKGROUND[0002]Existing portable processing devices may permit a user to provide input via a joystick, menu options, a keypad, a small keyboard, or a D-pad. The portable processing devices may be small in size and may have small display screens. For example, if a portable processing device displays a document on a small display screen, only a portion of the document may be displayed at any one time. To view an undisplayed portion of the document, a navigation command may be input to the portable processing device to cause the displayed document to be scrolled to the undisplayed portion of the document. Providing input to scroll displayed content on a small display screen of a portable processing device may be tedious and cumbersome.SUMMARY[0003]This S...

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