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Array AOI system error correction algorithm design and implementation

Author: DuZuo
Tutor: WuJianJie
School: Huazhong University of Science and Technology
Course: Software Engineering
Keywords: Array automated optical inspection systems Calibration Fixture Linear correction Motion vector correction
CLC: TP274
Type: Master's thesis
Year: 2011
Downloads: 18
Quote: 0
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Abstract


Array automated optical inspection systems, although breaking the traditional automatic optical inspection system detection accuracy is low, slow and other issues, but also the emergence of new problems , theoretical precision can reach very high , but in practice can not reach the theoretical accuracy . The traditional way is not suitable for array calibration automatic optical inspection systems , and dynamic array optical detection system detection accuracy of the existing calibration methods can not reach the theoretical requirements , the need to improve the existing correction scheme . To this end, the existing array for automatic optical inspection system in the original calibration method based on the design of the new program correction to improve its accuracy. Automatic optical inspection system for correcting the problems benchmark , based on the existing algorithms to add a new algorithm, by reference fixture correction to correct the error . Fixture design process, for each defect correction scheme , the design of new algorithms and to eliminate errors fixture , to solve the previous calibration process is not found in the magnification correction plate and the problem of perspective . Final application fixture school correction data obtained when at rest Saotu maximum error is only one pixel . For mechanical motion error , design is based on chi-square distribution of the linear correction algorithm, automatic mechanical movement in the detection process correcting errors. By fixture linear error correction and compensation, the puzzle effect with the effect of greatly improved , to the automatic optical detection array theoretical precision , solder paste inspection machine and plate inspection machine has been used in the actual production . Solder joint inspection machine exists for the placement error , the design of the motion vector based on motion compensation correction algorithm . According to H.264, motion compensation algorithms used to carry out the appropriate modifications to calculate the offset and angle elements . For the average detector elements with good results. After the above error correction algorithm , the array type automatic optical inspection system detection accuracy achieved the desired accuracy.

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