Orientation Disparity: A Cue for 3D Orientation?
Orientation Disparity: A Cue for 3D Orientation?
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DOI：
10.1162/neco.2009.08-08-848
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发表时间：
2009-09-01
影响因子：
2.9
通讯作者：
Knill, David C.
中科院分区：
文献类型：
--
作者：
Greenwald, Hal S.;Knill, David C.
方向视差，即倾斜表面上的纹理元素投射到两只眼睛时产生的方向差异，已被提议作为 3D 方向的双眼提示。由于方向差异与位置差异混淆，行为和神经生理学实验都没有成功地分离出它对倾斜估计的贡献，也没有确定视觉系统是否使用它。使用改进的视差能量模型，我们模拟了调整到方向视差的双眼视觉皮层神经元群体，并测量了活动模式中包含的费舍尔信息量。我们评估了方向差异对 3D 方向估计的潜在贡献，并界定了它作为可靠线索的刺激条件。我们的结果表明，方向差异是有关 3D 方向的有效信息来源，并且视觉系统可能具有对其敏感的机制，这似乎是合理的。尽管方向视差对于估计倾斜既不是必要的也不是充分的，但当与位置视差梯度和单眼透视线索的估计相结合时，它似乎可能很有用。
Orientation disparity, the difference in orientation that results when a texture element on a slanted surface is projected to the two eyes, has been proposed as a binocular cue for 3D orientation. Since orientation disparity is confounded with position disparity, neither behavioral nor neurophysiological experiments have successfully isolated its contribution to slant estimates or established whether the visual system uses it. Using a modified disparity energy model, we simulated a population of binocular visual cortical neurons tuned to orientation disparity and measured the amount of Fisher information contained in the activity patterns. We evaluated the potential contribution of orientation disparity to 3D orientation estimation and delimited the stimulus conditions under which it is a reliable cue. Our results suggest that orientation disparity is an efficient source of information about 3D orientation and that it is plausible that the visual system could have mechanisms that are sensitive to it. Although orientation disparity is neither necessary nor sufficient for estimating slant, it appears that it could be useful when combined with estimates from position disparity gradients and monocular perspective cues.