激光与光电子学进展, 2018, 55 (1): 011007, 网络出版: 2018-09-10
基于Shearlet变换的扫描文档图像倾斜检测 下载: 1085次
Skew Detection of Scanned Document Image Based on Shearlet Transform
图像处理 Shearlet变换 多尺度分析 扫描电子文档 倾斜检测 image processing Shearlet transform multi-scale analysis scanned electronic documents skew detection
摘要
针对含有文本、图像、表格和公式等复杂扫描电子文档的倾斜校正问题,提出了一种基于Shearlet(剪切波)变换与多尺度分析的复杂文档图像倾斜检测方法,利用剪切波变换的局部性和方向性,可以得到各个方向的能量值,能量最高的两个分量分别对应于横画与竖画的方向,根据这两个方向可以较准确地检测出扫描文档图像中文字行的方向并进一步确定扫描文档图像的倾斜角度。实验结果表明,该方法可以避免扫描文档中图像、表格等的干扰,具有较好的抗噪声能力,对于具有复杂内容的文档图像有较高的检测准确率。
Abstract
For the skew correction of complex scanned electronic documents with text, images, tables and formulas, a new skew detection method is proposed based on Shearlet transform and multi-scale analysis. Based on the localization and directionality of Shearlet transform, energy in all directions can be obtained. The two components with the highest energy can correspond to the horizontal and vertical directions, respectively. According to these two directions, the direction of the text line in the scanned document can be accurately detected and the skew angle of document image can be further determined. The experimental results show that the proposed method can avoid the interference of images, tables, and so on in scanned documents, and has a good anti-noise ability. The proposed method is of higher detection accuracy for document images with complex content.
张新红, 张一凡, 张帆. 基于Shearlet变换的扫描文档图像倾斜检测[J]. 激光与光电子学进展, 2018, 55(1): 011007. Zhang Xinhong, Zhang Yifan, Zhang Fan. Skew Detection of Scanned Document Image Based on Shearlet Transform[J]. Laser & Optoelectronics Progress, 2018, 55(1): 011007.