| US 7,468,815 B2 | ||
| Optical data processing using photo-detector array and framing marks on optical media | ||
| Darwin Mitchel Hanks, Fort Collins, Colo. (US) | ||
| Assigned to Hewlett-Packard Development Company, L.P., Houston, Tex. (US) | ||
| Filed on Sep. 30, 2004, as Appl. No. 10/955,703. | ||
| Prior Publication US 2006/0072401 A1, Apr. 06, 2006 | ||
| Int. Cl. H04N 1/387 (2006.01) | ||
| U.S. Cl. 358—3.28 [358/1.2] | 16 Claims |
| 1. An optical processing system, comprising:
a photodetector array to obtain an image of light modulated by reflection off a data track defined on optical media, wherein
the image comprises at least one framing mark and at least one data region; and
a post-processor configured to:
analyze the image and to recognize the at least one framing mark and data within the at least one data region;
derive a scaling factor by measurement of at least one framing mark and comparing the measurement to dimensions of known framing
marks; locate data within the image based on a direction from a location of a
recognized framing mark and a distance based on the scaling factor, wherein a relative size and location of framing marks
and data regions is predetermined;
focus the image, if distortion of the recognized framing marks in the image is indicated by differences from an expected appearance
of the framing marks, by repositioning lenses based on a function of the scaling factor; and
read the located data from the image.
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