منابع مشابه
Spectral sharpening with positivity
Spectral sharpening is a method for developing camera or other optical-device sensor functions that are more narrowband than those in hardware, by means of a linear transform of sensor functions. The utility of such a transform is that many computer vision and color-correction algorithms perform better in a sharpened space, and thus such a space can be used as an intermediate representation for...
متن کاملSpectral sharpening by spherical sampling.
There are many works in color that assume illumination change can be modeled by multiplying sensor responses by individual scaling factors. The early research in this area is sometimes grouped under the heading "von Kries adaptation": the scaling factors are applied to the cone responses. In more recent studies, both in psychophysics and in computational analysis, it has been proposed that scal...
متن کاملDevice-Independent Color via Spectral Sharpening
Color sensors in scanners and color copiers are not colorimetric | RGB values are not a linear transformation away from device{independent XYZ tristimu-lus values. For a given set of targets or dyes one can readily nd a best linear transform or use interpolation. However, when the possible targets are unknown, a data-independent transform is needed. Here, we set out a very simple linear transfo...
متن کاملSpectral Sharpening and the Bradford Transform
The Bradford chromatic adaptation transform, empirically derived by Lam [1], models illumination change. Specifically, it provides a means of mapping XYZs under a reference source to XYZs for a target light such that the corresponding XYZs produce the same perceived colour. One implication of the Bradford chromatic adaptation transform is that colour correction for illumination takes place not ...
متن کاملSpectral positivity and Riemannian coverings
Let (M,g) be a complete non-compact Riemannian manifold. We consider operators of the form ∆g + V , where ∆g is the non-negative Laplacian associated with the metric g, and V a locally integrable function. Let ρ : (M̂ , ĝ) → (M,g) be a Riemannian covering, with Laplacian ∆ĝ and potential V̂ = V ◦ ρ. If the operator ∆ + V is non-negative on (M,g), then the operator ∆ĝ + V̂ is non-negative on (M̂, ĝ)...
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ژورنال
عنوان ژورنال: Journal of the Optical Society of America A
سال: 2000
ISSN: 1084-7529,1520-8532
DOI: 10.1364/josaa.17.001361