Method for calculating frequency shifts for scan line...

Details Method for calculating frequency shifts for scan line... Method for calculating frequency shifts for scan line...

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03

G

G03G 15/05 (2006.01) G02B 26/12 (2006.01) G06F 3/12 (2006.01) H04N 1/053 (2006.01) H04N 1/113 (2006.01) H04N 1/12 (2006.01)

Patent

CA 2327009

The pixel clock of a raster output scanning (ROS) system modulates an emitted light beam to provide pixel placement along a scan line. A method calculates the pixel clock frequency shifts to correct non-linearity of the scan line in a ROS. A data smoothing polynomial is calculated for the non-linearity of the pixels along the scan line. The needed frequency shift based on the polynomial to the first or higher orders is calculated and stored in a frequency shift look-up table. The calculated frequency shift from the frequency shift lookup table modifies the nominal pixel clock frequency to correct for the measured scan linearity of the ROS by modulation of the light beam.

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