A super-resolution technique with motion estimation considering atmospheric turbulence

Hu He; Lisimachos P. Kondi

doi:10.1117/12.603918

19 May 2005 A super-resolution technique with motion estimation considering atmospheric turbulence

Hu He, Lisimachos P. Kondi

Proceedings Volume 5789, Passive Millimeter-Wave Imaging Technology VIII; (2005) https://doi.org/10.1117/12.603918
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

Image registration is a crucial part of the success of the super-resolution algorithms. In real applications, atmospheric turbulence is an important factor that brings further degradation to the low-resolution image sequence (video frames), besides other degradations such as global motion due to movement of the optical device, blurring due to the point spread function of the lens, and blurring due to the finite size of the detector array. In this paper, the degradation of the atmospheric turbulence to the low-resolution images is modeled as per-pixel motion in the high-resolution plane and is assumed to be spatially local and temporally quasi-periodic. The registration is a two-stage process: first, the global motion between frames is estimated using the phase-correlation method to remove "jitter" and stabilize the sequence; then, an optical flow method with quasi-periodic constraint is used to estimate the per-pixel motion. A threshold is used to separate the relatively larger object movement from per-pixel atmospheric turbulence. After registration, the shift map of each frame is obtained, along with a prototype of the high-resolution image. A maximum a posteriori (MAP) based super-resolution algorithm is therefore applied to reconstruct the high-resolution image. Experiments using synthetic images are conducted to verify the validity of the proposed method. Finally, conclusions are drawn.

Citation Download Citation

Hu He and Lisimachos P. Kondi "A super-resolution technique with motion estimation considering atmospheric turbulence", Proc. SPIE 5789, Passive Millimeter-Wave Imaging Technology VIII, (19 May 2005); https://doi.org/10.1117/12.603918

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