| 摘要 |
A circuit for calculating a light reflected component with high accuracy. The circuit for calculating a reflected component of light reflected from an object having a rough surface comprises a means for storing the reflectance of an object in relation to the value phi or the value of cos phi, letting a surface normal vector be denoted by a vector N, a light source incidence unit vector be denoted by a vector L, a line-of-sight unit vector be denoted by V, a half vector of the light source incidence vector L and the line-of-sight vector V be denoted by H and defining the inner products as N.L=cos theta, N.V=cos gamma, V.H=cos phi, N.H=cos beta; a means for storing a luminance distribution in relation to the value of beta or the value of cos beta; a means for acquiring information on the reflectance term (F80 (phi)) of the reflected component according to the value of phi or the value of cos phi from the reflectance storing means; a means for acquiring information on the luminance distribution term (D'(beta)) of the reflected component according to the value of beta or the value of cos beta from the luminance distribution storing means; a means for acquiring information on max[0.5 cos theta cos phi, 0.5 cos phi cos gamma, cos theta cos beta cos gamma] which is the maximum value out of 0.5 cos theta cos phi, 0.5 cos phi cos gamma, cos theta cos beta cos gamma; a means for determining the reciprocal of the max[0.5 cos theta cos phi, 0.5 cos phi cos gamma, cos theta cos beta cos gamma] and acquiring information on the geometrical attenuation factor term G'(beta,theta,gamma,phi) of the reflected component; and a means for acquiring information on the reflected component from the information on the luminance distribution term (D'(beta)) and information on the geometrical attenuation factor term G'(beta,theta,gamma,phi).
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