Independence of color and luminance edges in natural scenes
Independence of color and luminance edges in natural scenes
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DOI：
10.1017/s0952523808080796
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发表时间：
2009-01-01
影响因子：
1.9
通讯作者：
Gegenfurtner, Karl F.
中科院分区：
文献类型：
--
作者：
Hansen, Thorsten;Gegenfurtner, Karl F.
形式视觉传统上被认为主要是处理消色差信息。以往对自然场景中色彩和亮度统计的研究表明，亮度和色度边缘并不是相互独立的，任何色度边缘都很可能与亮度边缘同时出现。在这里，我们计算了700多张来自自然场景的校准彩色图像的亮度和色彩边缘的联合统计。我们发现等亮度边缘在自然场景中是存在的，而且并不比纯亮度边缘少。大多数边缘结合了亮度和颜色信息，但程度不同，因此亮度和颜色边缘在统计上是相互独立的。独立性随着视觉加工的连续阶段而增加，从视锥细胞通过感受器后颜色对抗通道到边缘。结果表明，在自然和人工视觉系统中，彩色边缘对比度是一个独立的信息源，可以与其他线索线性结合，以实现物体的正确分割。色彩视觉可能是为了响应自然场景统计而进化的，以获得这种独立的信息。
Form vision is traditionally regarded as processing primarily achromatic information. Previous investigations into the statistics of color and luminance in natural scenes have claimed that luminance and chromatic edges are not independent of each other and that any chromatic edge most likely occurs together with it luminance edge of similar strength. Here we computed the joint statistics of luminance and chromatic edges in over 700 calibrated color images from natureal scenes. We found that isoluminant edges exist in natural scenes and were not rarer than pure luminance edges. Most edges combined luminance and chromatic information but to varying degrees Such that luminance and chromatic edges were statistically independent of each other. Independence increased along Successive stages of visual processing from cones via postreceptoral color-opponent channels to edges. The results show that chromatic edge contrast is an independent source of information that can be linearly combined with other cues for the proper segmentation of objects in natural and artificial vision systems. Color vision may have evolved in response to the natural scene statistics to gain access to this independent information.