fourier-mellin transform meaning in English
傅里叶
Examples
- The feature parameter extraction methods of the underwater target are studied which can improve the performance of the underwater acoustic countermeasure equipments . several feature extraction methods such as the scale invariance feature extraction , target pole extraction fourier - mellin transform etc are investigated by computer simulations . the experimental results demonstrated the efficiency of these feature extraction methods in the applications of underwater target recognition
对多种特征提取方法如目标相对不变尺度特征提取、目标极点特征提取、目标信号的傅里叶?梅林变换特征提取等进行了仿真研究，结果表明了这些特征参数提取方法的有效性，具有良好的应用前景。 - First , resistance to geometrical distortion was obtained by using moment normalization ; second , we focus on the phase of fourier - mellin transform . before detecting watermark , synchronization could be retrieved by using the phase information . to eliminate the influence of pixel value distortion generated during print / scan process , a dft - based robust watermark algorithm was designed , which could successfully detect watermark from a severe distorted image
另一种思路是根据图像经过旋转、缩放、平移后，其傅立叶?梅林变换域只有相位受到影响的特点，从其相位中提取几何失真信息，然后再进行相应的失真补偿，从而消除几何失真的影响；对于打印扫描过程产生的像素值失真，本文也提出了一种基于dft的鲁棒性算法，能在较严重的图像失真情况下，成功检测水印。