Correction method for large-scale scanner consisting of multiple linear array photoelectric sensor

Abstract

The invention relates to a corrector method of a wide-format scanner consisting of a plurality of linear array photoelectric sensors, and belongs to the field of picture scanning technique. The inventive method comprises placing a calibration card at the juncture site of the two adjacent linear array photoelectric sensors A and B, and simultaneously scanning the calibration card to obtain two scanning pictures; calculating the overlapping length of the two scanning picture in the horizontal direction to obtain the number Ai of overlapped pixels between the two adjacent linear array photoelectric sensors, thereby realizing the connection of the linear array photoelectric sensors A and B in the horizontal direction; using the Bi as the boundary point between the two adjacent linear array photoelectric sensors to obtain the pixel serial numbers of the linear array photoelectric sensors A and B, calculating the displacements in the vertical direction to obtain a displacement difference Ci in the vertical direction, thereby ensuring equal displacements of the linear array photoelectric sensors A and B in the vertical direction. The inventive method realizes the real-time calculation of connection site by using the software algorithm, and can greatly reduce the requirement for processing accuracy during the production process of the wide-format scanner and thereby reduce the costs of production and transportation of equipment.

Description

technical field [0001] The present invention relates to a kind of correction method of the large format scanner that is made up of a plurality of linear array photoelectric sensors, relate in particular to a plurality of linear array charge-coupled devices (hereinafter referred to as CCD) or a plurality of linear array contact image sensors (hereinafter referred to as CIS) ) and a correction method for a large-format scanner, belonging to the technical field of image scanning. Background technique [0002] A scanner is an opto-mechanical-electrical integration device that converts physical drawings into digital images. Large format scanners are usually required to cover a width above A0 (84.1 cm, about 33.1 inches). The photoelectric sensor line array CCD / CIS generally only covers A4 width (21 cm, about 8.27 inches). Therefore, if it is required to cover a width above A0, multiple CCDs / CISs need to work at the same time for horizontal splicing, that is, splicing a group of...

AI Technical Summary

Problems solved by technology

However, as the resolution of CCD / CIS devices increases to 600 or even 1200DPI, users’ requirements for manuscript scanning quality continue to increase. The method of simply relying on the accuracy of machining to ensure the splicing of multiple CCD / CIS devices can no longer meet the needs. A method that can automatically calculate the stitching position between devices is needed to achieve this function

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