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Self calibrating scanner with single or multiple detector arrays and single or multiple optical systems
| Details |
Inventors: Leberl, Franz W.; Jorde, Christian; Gruber, Michael;
Assignee: Vexcel Imaging GmbH (AT)
Primary Examiner: Coles, Sr.; Edward L.
Assistant Examiner: Wallerson; Mark
Attorney, Agent or Firm:
A system for scanning and digitizing large images using a reseau for accuracy without obscuring the image to be scanned. The system uses two separate CCD photoreceptor arrays which are fixed in a rigid position with respect to each other and any accompany lenses and mirrors. In one embodiment, a first CCD photoreceptor array is used to scan the image while the second CCD photoreceptor array simultaneously scans the reseau. In a second embodiment, a single CCD photoreceptor array is used to first scan the reseau and then to scan the image. One illumination source illuminates the reseau while second illumination source illuminates the image. The arrangement of the lens(es) and the photoreceptor arrays allows the determination of any displacement of the scanner along the X-axis, Y-axis, and Z-axis, as well as the determination of any rotation of the scanner around the X-axis, Y-axis, or Z-axis. The position and attitude of the scanner, as determined by scanning the reseau, is used to correct any errors in the resulting image that are caused by displacement or rotation of the scanner. A large image can be scanned in separate but overlapping swaths, the overlap being used to align the swaths to create a final seamless digital image from the assembled swaths. |
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DETAILED DESCRIPTION Accordingly, it is a general object of the present invention to provide a system for image scanning and digitizing using a reseau for accuracy, but without obscuring the image to be scanned.
A more specific object of this invention is to provide an image scanner and digitizer that uses a reseau for accuracy, while eliminating reseau marks from the object image and their effects of distorting the scanned object image.
Another object of the present invention is to provide a high speed, yet highly accurate image scanner and digitizer that can scan and digitize large area object images at lower cost than would otherwise be possible if the photoreceptor must be positioned by a mechanically precise mechanism.
Another object of the present invention is to provide a highly accurate image scanner using linear photoreceptor arrays without a need to position the linear photoreceptor arrays very precisely.
Additional objects, advantages, and novel features of the invention shall be set forth in part in the description that follows, and in part will become apparent to those skilled in this art upon examination of the following or may be learned by the practice of the invention.
The objects and the advantages may be realized and attained by means of the instrumentalities and in combinations particularly pointed out in the appended claims.
In accordance with the invention, two photoreceptor arrays are provided with optics systems for scanning--one array scanning the object image and the other array scanning a reseau which is placed outside the imaging view of the object image scanner.
The reseau marks are not detected by the object image scanner and the object image is not detected by the reseau scanner.
The reseau marks are used to determine the scanner's position (X, Y, Z) and attitude (tip .
psi.
, roll .
omega.
, yaw .
alpha.
) accurately and precisely and to correct errors in the scanner's movements.
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Optical Systems 
