Sparse high‐degree polynomials for wide‐angle lenses
Sparse high‐degree polynomials for wide‐angle lenses
复制标题
广角镜头的稀疏高次多项式
DOI:
10.1111/cgf.12952
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发表时间:
2016
影响因子:
2.5
通讯作者:
und Carsten Dachsbacher
中科院分区:
文献类型:
--
作者:
Emanuel Schrade;Johannes Hanika;und Carsten Dachsbacher
Rendering with accurate camera models greatly increases realism and improves the match of synthetic imagery to real‐life footage. Photographic lenses can be simulated by ray tracing, but the performance depends on the complexity of the lens system, and some operations required for modern algorithms, such as deterministic connections, can be difficult to achieve. We generalise the approach ofpolynomial optics, i.e. expressing the light field transformation from the sensor to the outer pupil using a polynomial, to work with extreme wide angle (fisheye) lenses and aspherical elements. We also show how sparse polynomials can be constructed from the large space of high‐degree terms (we tested up to degree 15). We achieve this using a variant oforthogonal matching pursuitinstead of a Taylor series when computing the polynomials. We show two applications: photorealistic rendering using Monte Carlo methods, where we introduce a new aperture sampling technique that is suitable for light tracing, and an interactive preview method suitable for rendering with deep images.
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影响因子:
2.5
作者:
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通讯作者:
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影响因子:
2.5
作者:
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DOI:
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发表时间:
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期刊:
The Visual Computer
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DOI:
10.1201/9781003059325-13
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期刊:
Signal Process.
影响因子:
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作者:
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