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Foveated imaging demonstration

D. V. Wick, T. Martinez, S. R. Restaino, and B. R. Stone

Open Access Open Access

Abstract

A wide field-of-view (FOV), theoretically diffraction-limited imaging system is demonstrated using a single positive lens (a singlet), a reflective liquid crystal spatial light modulator (SLM), a turning mirror and a CCD camera. The SLM is used to correct the off-axis aberrations that would otherwise limit the useful FOV of our system. Foveated imaging refers to the variation in spatial resolution across the image caused by using the SLM in this manner.

©2002 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Optical layout for foveated imaging system with up to a 25° field-of-view

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Fig. 2.
Fig. 2. Foveated imaging experiment

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Fig. 3.
Fig. 3. Images of checkerboard transparency. For each image, the left edge corresponds to a 25° field angle in x and the right edge to a 10 ° field angle in x (see Fig. 1). The voltages schemes applied to the SLM are (a) none, (b) correction at 10° in x (0° in y), and (c) correction at 25° in x (0° in y)

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Fig. 4.
Fig. 4. Images of a 25 μm pinhole at a 25° field angle (a) uncorrected, (b) corrected, and (c) corrected with camera gain reduced by a factor of four to avoid saturation.

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