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面向手绘军标图形的旋转自由识别方法

DOI: 10.11834/jig.20140316

Keywords: 手绘图形,军标图形,旋转自由识别,旋转角估计

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Abstract:

目的在笔式态势标绘应用中,识别手绘点状军标图形面临着图形类别多、图形类别之间相似度高、绘制方向可变等挑战。针对这些困难提出一个面向手绘军标图形的旋转自由识别方案,以识别图形类别和方向角为目标。方法首先通过旋转不变的粗分类缩小候选类别范围,然后估计待识别图形与模板图形间的方向夹角并将二者旋转对齐,最后用细化区分方法识别高相似度的图形类别。采用一种结合图形采样点空间分布和局部方向信息的方向Zernike矩特征描述图形样本,通过匹配方向Zernike矩可实现粗分类和旋转角估计。结果实验结果表明本文方法的分类准确率和角度估计精度均明显优于基于传统Zernike矩的识别方法。结论该方法可有效应用于对在线手绘军标图形进行旋转自由识别的场合。

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