Methods for rectifying projection-interferogram sequences of the computed-tomography imaging interferometer

Shufang He; Ningfang Liao; Xinquan Wang; Yu Lin; Qingmei Huang

doi:10.1117/12.791276

5 March 2008 Methods for rectifying projection-interferogram sequences of the computed-tomography imaging interferometer

Shufang He, Ningfang Liao, Xinquan Wang, Yu Lin, Qingmei Huang

Author Affiliations +

Proceedings Volume 6623, International Symposium on Photoelectronic Detection and Imaging 2007: Image Processing; 66230C (2008) https://doi.org/10.1117/12.791276
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

The Computed-Tomography Imaging Interferometer (CTII) is a novel imaging spectrometer, which combines the advantages of the conventional Fourier Transform Imaging Spectrometer (FTIS) and the ordinary Computed-Tomography Imaging Spectrometer (CTIS). CTII obtains multi-angle projection interferograms by rotating Dove prism placed in the collimating light beams. The image reconstruction is carried out by using computed-tomography reconstruction algorithm named Radon transform. However, in experiments, images reconstructed from the raw projection-interferogram sequences, are badly distorted. To solve this problem, we find when Dove prism is rotated, its rotation center is not coincident to the optic axis of CTII. Therefore, the raw projection-interferogram sequences have a few deviations to the ideal sequences. And then we find the deviations follow certain law, so it is possible to rectify the raw projection-interferogram sequences. In this paper, two methods, the Linear rectification method and the Cosine rectification method are proposed. The Linear rectification method uses an image processing method, gets the dither value at each rotation angle, and rectifies the raw images. The Cosine rectification method supposes the dither follows cosine change; the detail is presented in this paper. Finally, the reconstruction images are presented. The reconstruction results show these two rectification methods are feasible and effective.

Citation Download Citation

Shufang He, Ningfang Liao, Xinquan Wang, Yu Lin, and Qingmei Huang "Methods for rectifying projection-interferogram sequences of the computed-tomography imaging interferometer", Proc. SPIE 6623, International Symposium on Photoelectronic Detection and Imaging 2007: Image Processing, 66230C (5 March 2008); https://doi.org/10.1117/12.791276

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KEYWORDS

Prisms

CT reconstruction

Spectroscopy

Interferometers

Fourier transforms

Image processing

Reconstruction algorithms

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