Spatial frequency and visual discomfort
Spatial frequency and visual discomfort
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DOI：
10.1016/j.visres.2011.06.002
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发表时间：
2011-08-01
期刊：
影响因子：
1.8
通讯作者：
Hibbard, Paul B.
中科院分区：
文献类型：
--
作者：
O'Hare, Louise;Hibbard, Paul B.
通过添加集中在不同空间频率的多余能量，可以改变由噪声滤波后的图像，使其振幅谱约为1/f。研究了这种操作对视觉不适判断的影响。具有1/f振幅谱的视觉噪声（典型的自然图像）被认为比在狭窄的空间频带内对比度能量相对增加的任何图像更舒适。以0.375-1.5周期/度空间频率为中心的峰值始终被认为比更高空间频率的峰值更不舒服。这一发现对于偏心度的细微差异是稳健的，当刺激在空间频率上的感知对比度相匹配时。这些发现与一种观点是一致的，即偏离自然图像的统计数据可能会导致不适，因为视觉系统被优化为用自然场景的特定统计数据对图像进行编码。(C) 2011 Elsevier Ltd.版权所有。
Images created from noise filtered to have an approximately 1/f amplitude spectrum were altered by adding excess energy concentrated at various spatial frequencies. The effects of this manipulation on judgements of visual discomfort were studied. Visual noise with a 1/f amplitude spectrum (typical of natural images) was judged more comfortable than any image with a relative increase in contrast energy within a narrow spatial frequency band. A peak centred on 0.375-1.5 cycles/degree of spatial frequency was consistently judged as more uncomfortable than a peak at a higher spatial frequency. This finding was robust to slight differences in eccentricity, and when stimuli were matched for perceived contrast across spatial frequency. These findings are consistent with the idea that deviation from the statistics of natural images could cause discomfort because the visual system is optimised to encode images with the particular statistics typical of natural scenes. (C) 2011 Elsevier Ltd. All rights reserved.