An Improved Fourier-Mellin Transform-Based Registration Used in TDI-CMOS

An Improved Fourier-Mellin Transform-Based Registration Used in TDI-CMOS
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TDI-CMOS 中基于傅里叶梅林变换的改进配准

DOI:
10.1109/access.2021.3075235
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发表时间:
2021
期刊:
影响因子:
3.9
通讯作者:
Qu Hongsong
Qu Hongsong
中科院分区:
计算机科学3区
文献类型:
--
作者:
Feng Qinping;Tao Shuping;Liu Chunyu;Qu Hongsong

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时间延迟积分(TDI)是机载相机中用于补偿图像运动的常见成像模式。提出了一种改进的基于傅里叶-梅林变换(FMT)的配准方法,可用于实现基于配准的TDI。该方法首先通过比较不同噪声强度下FMT谱的标准差-列曲线的变化,分析噪声对FMT谱的影响,然后根据FMT谱中各列的变化量设计一种特殊的滤波器WCSDF,最大程度地降低噪声对配准过程的影响。最后提出了一种改进的基于FMT的配准方法,形成了一个基于配准的TDI框架。在计算机模拟中,所提出的方法显示出显着的改善,在鲁棒性噪声(噪声水平高达40)。与现有方法相比,该方法计算复杂度低,易于硬件实现,能够估计出较强的微弱噪声图像间的相对位移,生成的TDI图像在信息熵、平均梯度和空间频率响应等指标上具有较高的质量。
Time-delayed integration (TDI) is a common imaging mode used in airborne cameras to compensate for image motion. The paper presents an improved Fourier-Mellin transform (FMT)-based registration method, which can be used to realize the registration-based TDI. It first analyzes the noise influences on the FMT spectrum by comparing the curve changes in the standard-deviation versus column plots under the various intensity of noise, then designs a special filter called WCSDF according to the amount of variation of each column in the FMT spectrum, which can reduce the noise affection on registration process to the larger extent. And an improved FMT-based registration method is finally proposed to form a framework of registration-based TDI. In computer simulations, the proposed method shows a significant improvement in robustness to noise (noise level up to 40). Compared with the existing method, its low computational complexity makes the method easy to be implemented in hardware and can estimate the larger relative shifts among dim noisy images, moreover, the TDI images generated by the proposed framework have higher quality in the index of information entropy, average gradient, and spatial frequency response.
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