In optical imaging, the resolution of the imaging system is not only limited by the aperture and imperfection of the lens, but also by the CCD nonzero pixel size and separation between the two consecutive pixels. We deal only with the geometric superresolution and assume that the size of the CCD pixels is much smaller in comparison with the separation between the pixels. The separation between the pixels limits the resolution of the CCD camera. Our object is to address this problem. In the proposal, we focus on exceeding the geometric resolution with a new approach in which no moving element of the imaging system is used, but only a mask is placed at the Fourier transform plane. This mask encodes the input data. The encoded image is captured by the CCD. The captured image is then Fourier transformed and a decoding mask is used to nullify the effect of undersampling by the CCD. Mathematical modeling and simulation in one dimension are presented.
© 2010 Optical Society of America
Original Manuscript: January 5, 2010
Revised Manuscript: April 14, 2010
Manuscript Accepted: April 18, 2010
Published: May 21, 2010
Vol. 5, Iss. 10 Virtual Journal for Biomedical Optics
Mohammad Sohail and Asloob A. Mudassar, "Geometric superresolution by using an optical mask," Appl. Opt. 49, 3000-3005 (2010)