| 改进的Wallis变换在特征提取中的应用 |
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| 引用本文： | 杜艺,吴秀山,林祥国.改进的Wallis变换在特征提取中的应用[J].山东科技大学学报(自然科学版),2010,29(6). |
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| 作者姓名： | 杜艺 吴秀山 林祥国 |
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| 作者单位： | 中国测绘科学研究院北京四维远见信息技术有限公司;泰安瑞星工程咨询有限公司;中国测绘科学研究院摄影测量与遥感研究所; |
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| 基金项目： | 国家自然科学基金项目，中国博士后基金项目，中央级公益性科研院所基本科研业务费专项资金项目 |
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| 摘 要： | 经典的Wallis变换能在增强原始影像局部反差的同时压制噪声,但它在运算过程中需要对影像进行分块,并对每一块进行独立的处理,这会导致块效应现象。提出了一种双线性插值的Wallis变换方法,视觉分析表明,它有效避免了块效应现象,并将改进的方法应用于Blob特征提取。对比实验证明,由于块效应现象,经典的Wallis变换会在特征提取时提取不少伪Blob特征;而改进后的方法显著减少了提取的伪Blob特征,保证了提取特征的准确性。
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| 关 键 词： | Wallis变换 LoG算子 特征提取 Blob特征 |
Application of Improved Wallis Transformation in Feature Extraction |
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| DU Yi,WU Xiu-shan,LIN Xiang-guo.Application of Improved Wallis Transformation in Feature Extraction[J].Journal of Shandong Univ of Sci and Technol: Nat Sci,2010,29(6). |
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| Authors: | DU Yi WU Xiu-shan LIN Xiang-guo |
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| Institution: | DU Yi1,WU Xiu-shan2,LIN Xiang-guo3(1.Beijing Siweiyuanjian Info Technology Co.Ltd.,Chinese Academy of Surveying and Mapping,Beijing 100039,China,2.Tai'an Ruixing Engineering Consulting Co.Ltd.,Tai'an,Shandong 271000,3.Institute of Photogrametry and Remote Sensing,Beijing 100830,China) |
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| Abstract: | Classic Wallis transformation method was capable of enhancing the local contrasts of raw images as well as suppressing the image noises,but it needed the division of the raw image into blocks and processed each block independently,leading to block effect phenomenon.An improved Wallis transformation was presented,in which the bilinear interpolation was adopted to avoid the block effect,and this improvement could be proved by visual analysis.Subsequently,the improved method was employed to extract Blob featur... |
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| Keywords: | Wallis transformation LoG operator feature extraction Blob feature |
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