Design And Implementation Splicing Auxiliary Debugging System Of Multi-CCD Large Format Scanner

As a type of wide drawings high-precision digital input equipment, multi-CCDlarge-format scanners have a wide range of applications in military, mapping and otherspecial areas. Just because of requirements in large format and high precision, splicingproblem of multi-CCD in the production debugging of this kind of scanners comes outinevitably. Mechanical splicing precision of multi-CCD determines the whole accuracyof these scanners. The traditional manual adjustment of manufacturers is not onlytime-consuming and laborious, but also low-precision. Specific to the productiondebugging of one scanner, this paper designs and implements a computer-aided tuningsystem for the mechanical splicing debugging of multi-CCD.Based on the analysis of mechanical splicing debugging of multi-CCD, this paperanalyses functional requirements of the debugging system, designs the implementationof the whole system, and determines functions and implementations of modules such asimage display, image preprocessing, control point positioning and deviation for theprocess of splicing debugging. On the foundation of analysis and comparisons ofvarious grayscaling and denoising algorithms, to address the phenomenon of large colordeviation and dim image, this paper adopts such methods as median filter and Zhangthinning in the image preprocessing module to obtain clear and significant-featureimages. For the grid image after preprocessing, traditional template positioningalgorithm and sub-pixel algorithm for grid control point identification are used in thispaper, in order to satisfy the different needs of coarse alignment and fine calibration.After the control point positioning of the grid image, this paper realizes themeasurement and display of related deviation information according to differentdemands in the joint debugging link. Finally, the splicing aided alignment system isimplemented. Through simulation test, design requirements are achieved.The implementation of multi-CCD large-format scanner splicing system, not onlyreduces the work intensity and improves the production efficiency in the productiondebugging of the scanner, but also ensures the debugging precision of the equipment. Ithas a certain reference value to the design and implementation of the on-line automaticauxiliary adjusting system for related equipments.