Information limits on neural identification of colored surfaces in natural scenes.
Information limits on neural identification of colored surfaces in natural scenes.
复制标题
关于自然场景中有色表面的神经识别的信息限制。
DOI：
10.1017/s0952523804213335
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发表时间：
2004-05
影响因子：
1.9
通讯作者：
Amano, K
中科院分区：
文献类型：
--
作者：
Foster, DH;Nascimento, SMC;Amano, K
如果场景中的表面要通过颜色来区分，那么理想情况下，它们在某种程度上的神经表征应该随照明颜色变化很小。考虑了四种可能的神经编码：来自场景中单个点的 von-Kries 尺度锥体响应、由点对反射的光产生的锥体响应的空间比率，以及通过锐化（对手锥体）响应获得的这些量。这些代码在识别表面方面的有效性通过信息论措施进行了量化。数据取自使用高光谱相机成像的 25 个农村和城市场景的样本，该样本提供了每个场景的每个 1344 × 1024 像素以 10 nm 间隔的表面反射率估计值。在计算机模拟中，场景分别由相关色温 4000 K、6500 K 和 25,000 K 的日光照明。在每个场景中随机采样点并根据每个代码进行识别。研究发现，在光源变化下保留的最大信息随代码的不同而变化，但对于特定的代码来说，它在不同的场景中都非常稳定。 25 个场景的标准偏差平均约为 1 位，这表明表面颜色的神经编码可以独立于任何特定范围的光源的位置进行优化。
If surfaces in a scene are to be distinguished by their color, their neural representation at some level should ideally vary little with the color of the illumination. Four possible neural codes were considered: von-Kries-scaled cone responses from single points in a scene, spatial ratios of cone responses produced by light reflected from pairs of points, and these quantities obtained with sharpened (opponent-cone) responses. The effectiveness of these codes in identifying surfaces was quantified by information-theoretic measures. Data were drawn from a sample of 25 rural and urban scenes imaged with a hyperspectral camera, which provided estimates of surface reflectance at 10-nm intervals at each of 1344 × 1024 pixels for each scene. In computer simulations, scenes were illuminated separately by daylights of correlated color temperatures 4000 K, 6500 K, and 25,000 K. Points were sampled randomly in each scene and identified according to each of the codes. It was found that the maximum information preserved under illuminant changes varied with the code, but for a particular code it was remarkably stable across the different scenes. The standard deviation over the 25 scenes was, on average, approximately 1 bit, suggesting that the neural coding of surface color can be optimized independent of location for any particular range of illuminants.
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影响因子：
1.8
作者：
FOSTER, DH;SNELGAR, RS
通讯作者：
SNELGAR, RS
影响因子：
1.8
作者：
FOSTER, DH
通讯作者：
FOSTER, DH
DOI：
10.1364/josaa.20.001673
发表时间：
2003-09-01
影响因子：
1.9
作者：
Ripamonti, C;Westland, S
通讯作者：
Westland, S
DOI：
10.1073/pnas.141505198
发表时间：
2001-07-03
影响因子：
11.1
作者：
Foster, DH;Nascimento, SMC;Foster, JS
通讯作者：
Foster, JS
DOI：
10.1098/rspb.1994.0103
发表时间：
1994-08-22
影响因子：
4.7
作者：
FOSTER, DH;NASCIMENTO, SMC
通讯作者：
NASCIMENTO, SMC