Detection of chromoluminance patterns on chromoluminance pedestals I: threshold measurements
Detection of chromoluminance patterns on chromoluminance pedestals I: threshold measurements
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DOI：
10.1016/s0042-6989(99)00227-8
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发表时间：
2000-01-01
期刊：
影响因子：
1.8
通讯作者：
Brainard, DH
中科院分区：
文献类型：
--
作者：
Chen, CC;Foley, JM;Brainard, DH
测量基座上图案的检测阈值：各种类型有可能深入了解介导图案视觉的机制。这项研究涉及色亮度图案，即亮度、色度或两者随空间变化的图案。 1 c/deg Gabor 图案（目标）的对比度阈值作为 Gabor 基座图案（TvC 函数）对比度的函数进行测量：其中与每个目标配对的基座在色彩空间中的各种方向上进行调制。对于大多数目标-基座对来说，TvC 功能先降低（促进），然后随着基座对比度的增加而增加。除了在基座对比度范围的上端发生促进的情况外，所有目标基座对的增加都超过了绝对对比度阈值（掩蔽）。 TvC 函数的具体形式随目标和基座的不同而变化很大，这与 Foley 提出的基座效应的一般模型一致 [Journal of the Optical Society of America A, 1994, 11(6)]。有两组目标基座对没有发生促进，但确实发生了掩蔽：其中目标是亮度调制的对，并且基座是单独等亮度的，以及基座是蓝色/黄色并且目标在除蓝色/黄色之外的任何方向的对中。 (C) 2000 Elsevier Science Ltd. 保留所有权利。
Measurement of the detection thresholds of patterns on pedestals: of various kinds has the potential of providing insight into the mechanisms that mediate pattern vision. This study is concerned with chromoluminance patterns, that is, patterns that vary over space in luminance, chromaticity, or both. Contrast thresholds for 1 c/deg Gabor patterns (targets) were measured as a function of the contrast of Gabor pedestal patterns (TvC functions),: where the pedestals paired with each target were modulated in a wide range of directions in color space. For most target-pedestal pairs, the TvC function decreased (facilitation) and then increased as pedestal contrast increased. The increase went above the absolute contrast threshold (masking) for all target-pedestal pairs except in cases where facilitation occurred at the upper end of the pedestal contrast range. The specific form of the TvC function varied greatly with the target and pedestal, consistent with a general, model of pedestal effects proposed by Foley [Journal of the Optical Society of America A, 1994, 11(6)]. There were two sets of target-pedestal pairs for which facilitation did not occur, but masking did occur: pairs in which the target was a luminance modulation:and the pedestals were individually isoluminant and pairs in which the pedestal was blue/yellow and the target was in any-of our directions except blue/yellow. (C) 2000 Elsevier Science Ltd. All rights reserved.