| 摘要 |
A method and system for compensating for motion blur in optical navigation adds a correction offset to an image navigation value to adjust for varying velocities along a moving web. Reference and comparison images are acquired at different times from a moving web. The instant velocities of the web are determined for the acquisition times for the reference and comparison images, wherein the reference image velocity and the comparison image velocity may not be the same. An optical navigation value is computed representative of the movement of the web from the reference image to the comparison image. Based on the determined velocities and the image acquisition time, the blur distances for the two images can be calculated. A navigation error correction value is computed as one-half the difference between the reference blur distance and the comparison blur distance. A compensated navigation value is computed by adding the error correction value to the computed navigation value to compensate for varying web velocities. |
