| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for ameliorating poor image quality and poor registration of multiple scanned portions encountered in small scanners moved by hand over a document. <P>SOLUTION: An off-page condition or invalid sensor position data is detected by checking errors from an initial transformation parameter. If an abnormally large error is encountered, a sensor reading (position data) may be invalid or the sensor may have been off-page. Then, the invalid sensor data is identified and removed. Finally, the transformation parameters are re-estimated using valid sensor position data only. A weighted least-square minimization is used by considering a sensor lift situation. If a sensor is lifted, the weight for the error related to the sensor will be set to a small weight or zero. Also considered are geometric properties of sensor locations in weighting the sensor error. A confidence measurement of the sensor data and associated errors is performed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
