Variable optical sampling rate dependent on requested scan resolution
AssigneeHewlett-Packard Company
InventorsSteven L. Webb, Greg A. Degi
Life of this patent
Estimating the term…
Abstract
A method of determining an exposure time for a photosensor based on a desired resolution along a scan direction and a desired resolution in a cross direction may comprise the steps of determining an initial exposure time based on the desired resolution in the cross direction; determining a minimum resolution in the scan direction based on the initial exposure time; comparing the minimum resolution in the scan direction to the desired resolution in the scan direction; and increasing the initial exposure time if the minimum resolution in the scan direction is greater than the desired resolution in the scan direction.
Claims20
A method of determining an exposure time for a photosensor based on a desired resolution along a scan direction and a desired resolution in a cross direction, comprising the steps of:
- determining an initial exposure time based on the desired resolution in the cross direction;
- determining a minimum resolution in the scan direction based on said initial exposure time;
- comparing said minimum resolution in the scan direction to the desired resolution in the scan direction;
- and
- increasing said initial exposure time to an increased exposure time and redetermining a minimum resolution in the scan direction based on said increased exposure time and recomparing said minimum resolution in the scan direction to the desired resolution in the scan direction until either:
- a) said minimum resolution in the scan direction is not greater than the desired resolution in the scan direction or b) said increased exposure time is equal to a predetermined maximum exposure time.
A method of scanning an object at a desired resolution along a scan direction and a desired resolution in a cross direction, comprising the steps of:
- determining an initial exposure time for a scanner photosensor based on the desired resolution in the cross direction;
- determining a minimum resolution in the scan direction based on said initial exposure time;
- comparing said minimum resolution in the scan direction to the desired resolution in the scan direction;
- increasing said initial exposure time to an increased exposure time, redetermining a minimum resolution in the scan direction based on said increased exposure time and recomparing said minimum resolution in the scan direction to the desired resolution in the scan direction until either:
- a) said minimum resolution in the scan direction is not greater than the desired resolution in the scan direction or b) said increased exposure time is equal to a predetermined maximum exposure time;
- determining an effective resolution in the cross direction based on said increased exposure time;
- determining a scan line sweep rate based on said increased exposure time and the desired resolution in the scan direction;
- and
- scanning the object at said increased exposure time and at said scan line sweep rate.
Dependencies are inferred from the claim text.