相位相关法及其在偏振图像配准中的应用研究

分析了遥感偏振探测的原理和与遥感强度探测相比所具有的优越性,指出了偏振图像的特点。采用偏振测量方法,可以获得地物的偏振信息,有助于增强对地物的探测能力,但是对图像像元不对准有很高的敏感性,为了得到可靠的偏振信息,配准的精度应该至少到达0．1个像素。介绍了一种基于傅立叶变换的配准方法：相位相关法,并把该方法应用于偏振图像配准中。相位相关法根据傅立叶变换的平移性质,能够解决具有平移关系的图像配准问题,实验证明该方法具有对噪声和图像灰度变化不敏感的优点。

Phase Correlation Algorithm and Its Application in Registration of Polarization Images

The principle of polarization remote sensing detection and advantages contrast to intensity remote sensing detection are analyzed.The characteristics of polarization images are pointed out.Using polarization measurement,the polarization information of natural scenes helping to enhance the capacity of natural scenes detection can be obtained,but it is highly sensitive to misregistration.The registration accuracy should be at least 0.1 pixel in order to yield credible polarization information.A Fourier transform-based registration technique,the phase correlation method,is introduced.It is applied to register polarization images.According to the translation property of Fourier transform,the phase correlation algorithm can register images that are translated with respect to one another.The experimental results show that the method has many advantages, such as insensitive to noise and uniform variations of intensity.