二维EMD应用在图像边缘特征提取中的仿真研究

Simulation Research of Applying Two-dimensional Empirical Mode Decomposition on Image Feature Extraction

图像边缘特征提取是图像处理理论和应用研究的主要内容之一,传统的特征提取方法简单易行,但提取的图像精度不高。为此,提出了一种基于二维EMD及Riesz变换的双重复合图像边缘特征提取方法。首先通过二维EMD将图像分解成多层IMF分量,然后利用Riesz变换的局部"高保真性",替代Hilbert变换进行各分量的局部特性分析,给出更高分辨率的图像边缘特征提取算法。最后,仿真分析验证了该算法的可行性和有效性。

The edge feature extraction of image is one of the research fields of image processing theory and application. The traditional methods of image feature extraction are simple and proficient, but the accurate performance of the feature extracted is not even higher. As such, a new method for extracting image edge feature was proposed by using the two-dimensional Empirical Mode Decomposition （2-D EMD） and Riesz Transform. Firstly, the image was decomposed to multi-level Intrinsic Mode Function （IMF） by 2-D EMD, and then the Riesz Transform with stronger local preserving ability was used for analyzing their local properties instead of the Hilbert Transform, by which the edge feature extraction with higher resolution was carried on. Finally, simulation shows that the proposed method is feasible and valid.