07176905 is referenced by 70 patents and cites 22 patents.

Electronic devices having image-based data input systems are described. In one aspect, an electronic device includes a window, multiple indicia, an image sensor, and a data input processor. The window has a contact surface with an input region. The multiple indicia are viewable in the input region of the contact surface. The image sensor is constructed and arranged to produce image signals corresponding to images of the input region. The data input processor is coupled to the image sensor and is operable to produce input signals based on image signals produced by the image sensor and a mapping between areas of the input region images and locations of the input indicia.

Title
Electronic device having an image-based data input system
Application Number
10/368717
Publication Number
7176905 (B2)
Application Date
February 19, 2003
Publication Date
February 13, 2007
Inventor
Ramakrishna Kakarala
Santa Clara
CA, US
Dietrich W Vook
Menlo Park
CA, US
Xuemei Zhang
Mountain View
CA, US
Russell M Iimura
Sunnyvale
CA, US
Izhak Baharav
San Jose
CA, US
Assignee
Agilent Technologies
CA, US
IPC
G09G 5/00
View Original Source