| 基于非下采样contourlet变换的图像边缘检测新方法 |
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| 引用本文： | 肖易寒,席志红,海涛,郭亮.基于非下采样contourlet变换的图像边缘检测新方法[J].系统工程与电子技术,2011,33(7):1668-1672. |
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| 作者姓名： | 肖易寒 席志红 海涛 郭亮 |
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| 作者单位： | 哈尔滨工程大学信息与通信工程学院， 黑龙江 哈尔滨 150001 |
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| 基金项目： | 国家自然科学基金，中央高校基本科研业务费专项资金资助课题 |
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| 摘 要： | 非下采样contourlet变换(nonsubsampled contourlet transform, NSCT)由于其平移不变性使得检测出的边缘定位准确。但是传统的基于非下采样contourlet变换的边缘检测结果中仍存在伪边缘，这是固定阈值选取不当所致。采用双阈值对高频子带中的模极大值进行筛选，用得到的两个矩阵进行补偿链接可以减少伪边缘。由于NSCT系数的结构特点，低频子带中也存在丰富的边缘信息，再用Canny算子对低频子带进行检测。仿真结果表明，基于双阈值的模极大值方法检测的高频子带细节丰富、定位准确、纹理清晰，Canny算子检测的低频图像边缘，轮廓完整连续，融合后的图像有效地抑制了噪声，消除了伪边缘。
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| 关 键 词： | 边缘检测 非下采样contouriet变换 模极大值 双阈值 Canny算子 |
Image edge detection based on nonsubsampled contourlet transform |
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| XIAO Yi-han,XI Zhi-hong,HAI Tao,GUO Liang.Image edge detection based on nonsubsampled contourlet transform[J].System Engineering and Electronics,2011,33(7):1668-1672. |
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| Authors: | XIAO Yi-han XI Zhi-hong HAI Tao GUO Liang |
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| Institution: | College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China |
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| Abstract: | Due to the shift-invariance,nonsubsampled contourlet transform(NSCT) can accurately detect the edge orientation.However,traditional NSCT still reflects on pseudo-edge in the test result because of the improper selected fixed threshold.The dual-threshold is adopted to filter the modulus maximum in the high-frequency sub-band,and two matrices are obtained as link compensation in order to decrease the pseudo-edge.Owing to the structural characteristics of NSCT coefficient,there is also ample edge information i... |
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| Keywords: | image edge detection nonsubsampled contourlet transform(NSCT) modulus maximum dual-threshold Canny operator |
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