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本文对公文中的公章加盖过程进行了研究,分析了公章的透明迭加过程与油黑不足现象对目标定位的影响,并在此基础上提出实用的公章检测方法。在本方法中,通过公章的部分外圈圆弧的存在假设整体外圈圆环的存在,依据假设与实际图像之间的相似度来判断是否存在公章,如存在则进一步实现目标定位。文中也给出了在相应公章目标的相似度计算公式。
In this paper, we study the stamp affixing process in the official document, analyze the transparent superposition process of the official seal and the influence of oil black phenomenon on the target positioning, and put forward the practical method of official seal detection. In this method, the existence of the outer circle of the whole outer ring is assumed by the existence of some outer circle arcs of the official seal, and the presence or absence of the official seal is judged according to the similarity between the assumed and the actual image. If so, the target positioning is further realized. The article also gives the formula of similarity in the corresponding official seal.