System and method for correcting scan position errors in an imaging system
AssigneeECRM Incorporated
InventorsM. Niland, David Connor, Donald Troxel, John Connolly
Life of this patent
Estimating the term…
Abstract
Embodiments of the invention provide systems and methods for correcting scan position errors in an imaging system. In one embodiment of the present invention, the method includes determining an image beam velocity error as a function of a position within a scan line of an image, and using the image beam velocity error to determine a plurality of pixel clock frequencies to be respectively applied to a plurality of positions within the scan line.
Claims20
A method of correcting scan position errors in an imaging system comprising a direct digital synthesizer (DDS) unit, comprising:
- (a) computing a nominal frequency tuning word used by the DDS unit;
- (b) determining a number of corrections per scan line of an image;
- (c) determining a next correction position;
- (d) determining an image beam velocity error for the next correction position;
- (e) determining a corrected frequency tuning word;
- (f) utilizing the corrected frequency tuning word to determine a pixel clock frequency for the next correction position.
A method of correcting scan position errors in an imaging system, comprising:
- determining an image beam velocity error as a function of a position within a scan line of an image;
- and
- using the image beam velocity error to determine a plurality of frequency tuning words used to generate a plurality of pixel clock frequencies to be respectively applied to a plurality of positions within the scan line.
A system for correcting scan position error in an imaging system, comprising:
- firmware for:
- computing a nominal frequency tuning word used to control a rate of accumulation in a phase accumulator of a direct digital synthesizer (DDS) unit;
- determining a number of corrections per scan line of an image;
- determining a next correction position;
- determining an image beam velocity error for the next correction position;
- and
- determining a corrected frequency tuning word;
- wherein the DDS unit utilizes the corrected frequency tuning word to determine a pixel clock frequency for the next correction position.
A system for correcting scan position errors in an imaging system, comprising:
- firmware for determining a plurality of image beam velocity errors as a function of a plurality of respective positions within a scan line of an image;
- and
- a direct digital synthesizer unit for utilizing data representative of the plurality of the image beam velocity errors to determine a plurality of pixel clock frequencies to be respectively applied to the plurality of respective positions within the scan line.
Dependencies are inferred from the claim text.