Application of the light field for a simulation to evaluate the MTF of optical lens systems using rendering

Shuma Horiuchi; Manabu Yamamoto

doi:10.1117/12.2023580

25 September 2013 Application of the light field for a simulation to evaluate the MTF of optical lens systems using rendering

Shuma Horiuchi, Manabu Yamamoto

Author Affiliations +

Proceedings Volume 8841, Current Developments in Lens Design and Optical Engineering XIV; 884118 (2013) https://doi.org/10.1117/12.2023580
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

The modulation transfer function (MTF) in lens systems can be simulated using rendering. Here, the MTF is obtained by rendering test charts with bar target patterns after they are passed through an optical imaging system. The benefit of this method is that it can be applied to shift-variant systems, to which it is difficult to apply the point spread function (PSF), and that it enables the comparison of theoretical results to experimental results when test charts are imaged through an optical imaging system. However, the number of sampled rays must be increased to suppress the variance in the resulting radiance distribution, and the computation time increases proportionally with the number of analyzed spatial frequencies. This report proposes the recording of the light field of light rays, which is a function describing light rays at the entrance pupil. Focused images are compiled for each test chart based on the recorded light field. The time necessary for compilation is significantly shorter than for ray tracing in a lens; therefore, the radiance distribution can be rapidly obtained when the spatial frequency is changed. The methodology to record the light field and the data format are outlined in this report.

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Shuma Horiuchi and Manabu Yamamoto "Application of the light field for a simulation to evaluate the MTF of optical lens systems using rendering", Proc. SPIE 8841, Current Developments in Lens Design and Optical Engineering XIV, 884118 (25 September 2013); https://doi.org/10.1117/12.2023580

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KEYWORDS

Modulation transfer functions

Ray tracing

Spatial frequencies

Imaging systems

Point spread functions

Monte Carlo methods

Optical imaging

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