计算机工程与应用 ›› 2013, Vol. 49 ›› Issue (13): 125-127.

• 图形图像处理 • 上一篇    下一篇

改进的频域内亚像素级旋转角估计方法

张永亮,刘  哲,郝珉慧,张鹤妮   

  1. 西北工业大学 理学院,西安 710129
  • 出版日期:2013-07-01 发布日期:2013-06-28

Improved frequency domain approach for rotation angle estimation

ZHANG Yongliang, LIU Zhe, HAO Minhui, ZHANG Heni   

  1. School of Science, Northwestern Polytechnical University, Xi’an 710129, China
  • Online:2013-07-01 Published:2013-06-28

摘要: 亚像素级配准是超分辨率重构的前提,其中旋转角估计的准确程度对重构效果有直接影响。针对传统的频域内旋转角估计在小角度估计不精确的缺点,提出了用部分幅值进行配准的改进算法。实验结果表明,改进算法对小角度旋转角估计比传统算法效果好。

关键词: 超分辨率重构, 频域, 旋转角估计, 频谱图

Abstract: Sub-pixel image registration is an essential part of super-resolution image reconstruction algorithms. Unfortunately, when the rotation angel between input images is small, the conventional frequency domain algorithms cannot obtain an accurate estimation. Thus, an improved approach is proposed by taking into account both the high frequency and low frequency coefficients. The numerical results show that the proposed algorithm has a better performance in estimating the small rotation angles.

Key words: super resolution, frequency domain, rotation estimation, spectrogram