This paper first briefly introduces basic of computer vision and the background knowledge of using images of Convergent Beam Electrical Diffraction (CBED) patterns to conclude the structure symmetry of microscopic crystal. After that the various types of image symmetry are presented. Then modern research results on this area are given a systemic review. Finally the author gives his own method The question is converted into some optimization problem via proper symmetry measure function, the genetic algorithm is applied to search the best solution of image symmetry, and diffraction groups and point groups can be confirmed thereafter. All algorithms are realized in the software system. The automatic and quantitative analysis of structure symmetry of microscopic crystal is done with the same results as established knowledge.
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