A Vision Alignment Method Based on Improved Genetic Algorithm for IC Packaging
In order to improve the speed and accuracy of vision alignment for IC packaging, genetic algorithm and Otsu method are applied to vision alignment. According to the features of the image in IC packaging, an improved self-adaptive genetic algorithm combined with Otsu method is proposed in this paper, and the moment invariants method is used to carry out the remaining steps of vision alignment. Finally, experiments are undertaken by using a kind of IC chip, results show that the positioning error is less than 2μm, and the positioning time is less than 60ms.
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
S. W. Liu et al., "A Vision Alignment Method Based on Improved Genetic Algorithm for IC Packaging", Advanced Materials Research, Vols. 189-193, pp. 4177-4181, 2011