An image-computable psychophysical spatial vision model.
An image-computable psychophysical spatial vision model.
复制标题
图像可计算的心理物理空间视觉模型
DOI:
10.1167/17.12.12
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发表时间:
2017
影响因子:
1.8
通讯作者:
Wichmann F. A.
中科院分区:
文献类型:
--
作者:
Schütt;Wichmann F. A.
A large part of classical visual psychophysics was concerned with the fundamental question of how pattern information is initially encoded in the human visual system. From these studies a relatively standard model of early spatial vision emerged, based on spatial frequency and orientation-specific channels followed by an accelerating nonlinearity and divisive normalization: contrast gain-control. Here we implement such a model in an image-computable way, allowing it to take arbitrary luminance images as input. Testing our implementation on classical psychophysical data, we find that it explains contrast detection data including the ModelFest data, contrast discrimination data, and oblique masking data, using a single set of parameters. Leveraging the advantage of an image-computable model, we test our model against a recent dataset using natural images as masks. We find that the model explains these data reasonably well, too. To explain data obtained at different presentation durations, our model requires different parameters to achieve an acceptable fit. In addition, we show that contrast gain-control with the fitted parameters results in a very sparse encoding of luminance information, in line with notions from efficient coding. Translating the standard early spatial vision model to be image-computable resulted in two further insights: First, the nonlinear processing requires a denser sampling of spatial frequency and orientation than optimal coding suggests. Second, the normalization needs to be fairly local in space to fit the data obtained with natural image masks. Finally, our image-computable model can serve as tool in future quantitative analyses: It allows optimized stimuli to be used to test the model and variants of it, with potential applications as an image-quality metric. In addition, it may serve as a building block for models of higher level processing.
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影响因子:
5.4
作者:
Goris, Robbe L. T.;Putzeys, Tom;Wichmann, Felix A.
通讯作者:
Wichmann, Felix A.
影响因子:
2.5
作者:
Cavanaugh, JR;Bair, W;Movshon, JA
通讯作者:
Movshon, JA
影响因子:
1.8
作者:
K. May;J. Solomon
通讯作者:
K. May;J. Solomon
影响因子:
1.8
作者:
Holmes, DJ;Meese, TS
通讯作者:
Meese, TS
DOI:
10.1364/josaa.2.001508
发表时间:
1985-01-01
影响因子:
1.9
作者:
PELLI, DG
通讯作者:
PELLI, DG