Computer graphics processing and selective visual display system – Display peripheral interface input device
Reexamination Certificate
2011-06-28
2011-06-28
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
C345S166000, C345S173000, C345S175000, C382S260000, C382S261000, C382S262000, C382S263000, C382S264000, C382S265000
Reexamination Certificate
active
07969410
ABSTRACT:
Apparatus and method of optically detecting click events are described. Images of a contact surface are captured at respective capture times. The captured images are convolved with a two-dimensional circularly symmetric spatial bandpass filter to produce corresponding filtered images each including a set of pixels with respective pixel value magnitudes. Based on the pixel value magnitudes of the corresponding filtered images, each of the capture times is assigned to one of an in-contact time class during which the contact surface is determined to be in-contact with a user's finger and an out-of-contact time class during which the contact surface is determined to be out-of-contact with the user's finger. A select signal indicating that the contact surface has been touched to make a selection is generated based on a click event predicate defining at least one condition on the time classes respectively assigned to successive ones of the capture times.
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Avago Technologies General IP ( Singapore) Pte. Ltd.
Elnafia Saifeldin
Hjerpe Richard
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