no code implementations • 27 Jan 2022 • Yuteng Zhu, Graham D. Finlayson
According to our method, if we wish to measure color under a D65 light, we relight the scene with a modulated D65 spectrum where the light modulation mimics the effect of color prefiltering in the prior art.
no code implementations • 29 Sep 2020 • Yuteng Zhu, Graham D. Finlayson
In this paper, we present the detailed mathematical derivation of the gradient and Hessian matrix for the Vora-Value based colorimetric filter optimization.
no code implementations • 24 Jun 2020 • Graham Finlayson, Yuteng Zhu
In this paper we begin by observing that the function defining the Vora-Value is equivalent to the Luther-condition optimization if we use the orthonormal basis of the XYZ color matching functions, i. e. we linearly transform the XYZ sensitivities to a set of orthonormal basis.
no code implementations • 13 May 2020 • Yuteng Zhu, Graham D. Finlayson
The Luther condition states that if the spectral sensitivity responses of a camera are a linear transform from the color matching functions of the human visual system, the camera is colorimetric.
no code implementations • 26 Apr 2020 • Yuteng Zhu
Previously, a method has been developed to find the best colour filter for a given camera which results in the new effective camera sensitivities that best meet the Luther condition.
no code implementations • 27 Mar 2020 • Graham D. Finlayson, Yuteng Zhu
When we place a colored filter in front of a camera the effective camera response functions are equal to the given camera spectral sensitivities multiplied by the filter spectral transmittance.
