
Proceedings Paper
Using MTF data to simulate lens performanceFormat | Member Price | Non-Member Price |
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Paper Abstract
In many situations it is desirable to obtain an image that visually describes measured lens MTF data. Since the
sharpness of a camera lens changes continuously across the field of view, the characteristics of the lens need to
be determined at many positions within the image. In short, the proposed simulation method consists of two
parts. First, the point-spread function (PSF) at a limited number of field positions is constructed using Zernike
polynomials. The polynomial coefficients at a specified field position are determined by fitting the calculated
MTF for these PSFs to the measured MTF data. The other part interpolates Zernike coefficients for all other
relevant positions within the image. In this way it is possible to find a sufficiently accurate PSF at any arbitrary
field point. By utilizing a generalized non-translational invariant summation of PSFs, the sharpness at any field
point in the image can be simulated. This system also has the advantage that the sharpness at different focusing
positions can be determined quite easily. It is also a fairly simple matter to include effects such as distortion and
vignetting. In the present paper, examples of simulations are shown and advantages as well as drawbacks of the
method are discussed.
Paper Details
Date Published: 3 March 2008
PDF: 12 pages
Proc. SPIE 6817, Digital Photography IV, 68170O (3 March 2008); doi: 10.1117/12.759370
Published in SPIE Proceedings Vol. 6817:
Digital Photography IV
Jeffrey M. DiCarlo; Brian G. Rodricks, Editor(s)
PDF: 12 pages
Proc. SPIE 6817, Digital Photography IV, 68170O (3 March 2008); doi: 10.1117/12.759370
Show Author Affiliations
Henrik Eliasson, Sony Ericsson Mobile Communications (Sweden)
Published in SPIE Proceedings Vol. 6817:
Digital Photography IV
Jeffrey M. DiCarlo; Brian G. Rodricks, Editor(s)
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