In chapter four, according to analyzing of the composing, working process and fact-requirement for chart recognition module, this module is divided into several sub-modules.

第四章分析了图表识别模块的组成以及工作流程，结合实际需求对图表识别模块进行了划分。

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Then the thesis states design decision on controller software system and the flow chart or the calculating description on sub-process of key module.

然后阐述了控制器软件系统设计方案，并给出关键模块子程序流程图或算法描述。

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