| 摘要 |
SCENE BALANCE CALIBRATION OF DIGITAL SCANNER A digital imagery capture and storage mechanism controls the operation of a high resolution digital film scanner such that the scanner scans the image twice, the first scan being used to gather data to calibrate the scanner, and the second scan being used to capture and store a high resolution image. The scanner carries out a low resolution mode, prescan of the color photographic image frame, thereby obtaining a low spatial resolution digitized image. This low resolution digitized image is then analyzed by a scene balance mechanism to determine how the response characteristic of the scanner's imaging pixel array sees the image and encodes its spatial content. The output of this analysis, which represents the color balance content of the digitized image, is used to adjust the sensitivity range of the scanner, so that, during a subsequent high resolution scan of the image, the essential subject matter of the image will fall within the linear portion of the response range of the scanner's imaging pixel array. The high resolution digitized image is then processed by the scene balance mechanism to map the image data into a digitized image having a reduced encoding resolution corresponding to that of an attendant framestore.
|
