Gloss is an attribute of visual appearance that originates from the geometrical distribution of the light reflected by the surface. We used the maximum likelihood difference scaling (MLDS) procedure (L.T. Maloney & J. N. Yang, 2003) to estimate gloss scales over an extended range. Observers' judgments were obtained for a series of 10 black, coated samples for two directions of illumination, in binocular and monocular vision. The results showed a nonlinear relation between gloss percept and instrumental specular gloss values. Sensitivity is higher at extreme scale values than in the middle. In binocular vision, the sensitivity to gloss is higher than in monocular vision exclusively for high gloss levels. Lastly, we found that gloss difference scales, when expressed in terms of the samples rather than the photometric characteristics, vary little with the direction of illumination. Gloss scaling thus seems to be independent of the geometrical variations of the luminous flux at the surface of the sample. By analogy with the term "color constancy," we call this property "gloss constancy."
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机译:光泽度是视觉外观的一种属性,它源于表面反射的光的几何分布。我们使用最大似然差标度(MLDS)程序(L.T. Maloney&J. N. Yang,2003)来估计扩展范围内的光泽度。对于双眼和单眼视觉中两个照明方向的一系列10个黑色涂层样品,获得了观察员的判断。结果表明光泽感与仪器的镜面光泽值之间存在非线性关系。极端标度值处的灵敏度高于中间值。在双目视觉中,仅对高光泽度而言,对光泽的敏感性高于单眼视觉中的敏感性。最后,我们发现,以样品而不是光度特性表示的光泽度差异等级随照明方向的变化很小。因此,光泽度缩放似乎与样品表面的光通量的几何变化无关。与术语“色彩恒定”类似,我们将此属性称为“光泽恒定”。
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