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基于行间留白的文档图像校正方法 被引量:4
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作者 罗晓萍 《计算机工程》 CAS CSCD 北大核心 2017年第4期277-280,286,共5页
基于2D图像处理的文档图像校正技术通常先进行单词或字符分割,会导致算法复杂、耗时。针对该问题,提出一种改进的校正算法。运用向上优先区域生长法搜索行间留白,实现行间分割得到弯曲行图像。对弯曲行图像采用改进二遍扫描法标记字符... 基于2D图像处理的文档图像校正技术通常先进行单词或字符分割,会导致算法复杂、耗时。针对该问题,提出一种改进的校正算法。运用向上优先区域生长法搜索行间留白,实现行间分割得到弯曲行图像。对弯曲行图像采用改进二遍扫描法标记字符四连通区域获得行基点,对行基点使用最小二乘法拟合三次多项式,并将多项式曲线拉直拼接出全图。OCR应用和对比实验结果表明,该算法可提高字符识别率,并且能得到较好的视觉效果。 展开更多
关键词 卷积 最小二乘多项式拟合 二遍扫描法 区域生长法 图像拉直
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Vehicle Detection Method with Sub-stretching Based on Light Contrast in Fog Road Image
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作者 Myung-yoon LEE Hern-soo HAHN Young-joon HAN 《Journal of Measurement Science and Instrumentation》 CAS 2011年第1期25-29,共5页
In this paper, detection of a vehicle from a road image with fog is focused to detect an vehicle from a foggy image. Because of the fog in the image, a shape of an object is vague. Therefore an obstacle may occur on t... In this paper, detection of a vehicle from a road image with fog is focused to detect an vehicle from a foggy image. Because of the fog in the image, a shape of an object is vague. Therefore an obstacle may occur on the vehicle detection. Thus, features from a foggy road image are surveyed through experinmlts, and a histogram is caloalated with the bright value. The stretching method is then applied with the specific weight as the centre to detect a vehicle smoothly. If the high density area, from the view point of histogram, is applied with the stretching method, the definition of the image can be increased. On this fact, this paper proposed a method to divide the histogram and to determine applicable range of the stretching method. The improved results by the proposed methods are proved with the camparison tests between the proposed and previous methods. 展开更多
关键词 forggy image road image sub-stretching HISTOGRAM
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