Comparison and Simulation of Subpixel Imaging Modes for Linear CCD

Abstract:

Subpixel technique of linear CCD is effective to enhance the spatial resolution without increasing the focal length of optics and reducing the pixel size. To compare image quality of two main subpixel imaging modes, quincunx sampling and four-point sampling, a method to quantitatively evaluate image quality of subpixel based on MTF was proposed. The MTF of quincunx and four-point sampling modes were derived. Analytical results shows that theoretical limiting resolution of quincunx sampling and four-point sampling is improved to 1.4 and 1.86 times respectively, and MTF values at Nyquist frequency of two modes are increased by 0.1106 and 0.1679, respectively. MTFA in (0, 0.5) of two subpixel imaging modes were calculated and results illustrates that four-point sampling offers much more improvement with image quality than quincunx sampling, at the cost of double amount of data. A model for simulating subpixel imaging using Matlab was established, and simulation results of spoke target verify the theoretical analysis.

• Periodical: Applied Mechanics and Materials (Volumes 236-237)
• Pages: 1032-1037
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.236-237.1032
• Online since: November 2012
• Authors: Ya Peng Li, Bin He, Ting Yu Liu
• Keywords: Image Qualit, Limiting Resolution, MTF, MTFA, Simulation, Subpixel

References

[1] D. Seguela, C. Fratter, and P. Munier, SPOT5 system, SPIE, vol. 3750, 1999, p.212–220.

DOI: 10.1117/12.363516

[2] Liu XinPing, Gao Zhan, and Deng Nianmao, Subpixel imaging method with area-array CCD sensors and experiment, Chinese Science Bulletin, vol. 45 No. 2, January (2000).

DOI: 10.1007/bf02884658

[3] Zhengping. Xu, Wenqi. Ge, Shouwang. Yang, Contrast research on interpolation and subpixel imaging in CCD geometric superresolution reconstruction, IEEE, 2009, pp.294-297.

DOI: 10.1109/primeasia.2009.5397387

[4] G. C. Holst, Imaging system fundamentals, Optical Engineering, vol. 50(5), 052601. May (2011).

[5] G. C Holst, CMOS/CCD Sensors and Camera Systems, JCD Publishing: Bellingham, Washington, (2007).

[6] C. Latry and B Rouge, Super resolution: quincunx sampling and fusion processing, IEEE, 2003, pp.315-317.

DOI: 10.1109/igarss.2003.1293761

[7] J. C. Feltz, and M. A. Karim, Modulation transfer function of charge-coupled devices, Applied. Optics, vol. 29, No. 5, 1990, pp.717-722.

DOI: 10.1364/ao.29.000717

[8] O. Hadar, D. Dogariu, and G. D. Boreman, Angular dependence of sampling MTF, Applied. Optics, vol. 38, 1999, pp.782-785.