色调
底纹
色阶
知觉
方向(向量空间)
亮度
混合(物理)
彩色视觉
光谱颜色
有色的
光学
计算机视觉
感知
数学
人工智能
颜色模型
计算机科学
物理
几何学
色空间
心理学
图像(数学)
计算机图形学(图像)
材料科学
复合材料
神经科学
量子力学
作者
Daniel Holtmann-Rice,S. Zucker
出处
期刊:Journal of Vision
[Association for Research in Vision and Ophthalmology (ARVO)]
日期:2014-08-22
卷期号:14 (10): 462-462
摘要
In recent work, we demonstrated a strong interaction between color flows and luminance flows in the perception of complex shaded surfaces: When shading spatially covaries with spectral information, the shape from shading percept is strongly suppressed (an example of the color-shading effect). In explaining this phenomenon, we suggested a role for double-opponent orientation-selective operators. These operators can be interpreted as signaling spatial derivative information in the red-green and blue-yellow chromatic planes. Here we investigate the conditions under which these red-green and blue-yellow double-opponent flows align in orientation. We demonstrate theoretically that this alignment occurs when gradients of hue and chroma are themselves locally aligned. In this case, the double-opponent operators signal directions of constant hue ("iso-hue"). This situation arises for example in mixing between two colors, e.g., along a gradient. However, we show that the flows generically diverge when mixing between three or more color sources: In this case, directions of iso-hue and iso-chroma emerge as linear combinations of iso-RG and iso-BY directions. These observations facilitate the construction of stimuli that can identify whether directions of iso-hue play a causal role in the color-shading effect, or whether the effect can be explained solely in terms of covariation between red-green or blue-yellow double-opponent flows and the shading isophote structure. Meeting abstract presented at VSS 2014
科研通智能强力驱动
Strongly Powered by AbleSci AI