Computational adaptation model and its predictions for color induction of first and second orders

Spitzer, Hedva; Barkan, Yuval

doi:10.1016/j.visres.2005.08.002

Cited by 27 publications

(45 citation statements)

References 47 publications

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“…The effect of collinear facilitation (chromatic and achromatic) appear to be with an opposing mechanism rather than a related effect that consists of the induction effect and an adaptation mechanism (Dahari and Spitzer, 1996;Spitzer and Barkan, 2005). These two opposing processes enhance a patch (or an object) through the difference in the composition of its intensity, color or texture from its context, on the one hand, and facilitate its contours on the other hand.…”

Section: Discussionmentioning

confidence: 99%

“…In this way, the three different pairs of colors defined three different chromatic contrast channels. The stimuli were chosen to consist of color pairs that are complementary, in order to test whether the effect of chromatic collinear facilitation is similar or opposite to the effect of chromatic color induction, where the induced color is complementary to its chromatic inducer (Krauskopf et al, 1986;Semo et al, 1998;Spitzer and Barkan, 2005;Webster and Mollon, 1995). To include this question in the current study, we were obliged to choose a color space that would enable us to choose these complementary colors easily, and therefore we chose CIE XYZ, which is defined by luminance rather than luminance perception.…”

Section: Stimulimentioning

confidence: 99%

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Chromatic collinear facilitation, further evidence for chromatic form perception

2006

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Collinear facilitation of contrast detection of achromatic stimuli has been studied over the past decade by different groups. We measured collinear facilitation of chromatic contrast detection under equal-luminance (photometric quantity) and under isoluminance (minimum motion technique) conditions, as two different controls. The facilitation was tested for chromatic contrast detection of a foveal Gabor signal flanked by two high chromatic-contrast Gabor signals. The results indicated a significant facilitation in the presence of spatial adjacent collinear chromatic contrast signals, when the flankers were located at a short distance, across all observers for three chromatic channels. The facilitation was compared to a non-collinear flanker configuration. The results indicated no facilitation effect at the opposing phase configuration, at a short flanker distance, whereas a small facilitation was observed with a configuration at a longer flanker distance. The findings suggest that the performance and specificity of chromatic collinear facilitation is not impaired with regard to achromatic mechanisms.

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Section: Discussionmentioning

confidence: 99%

Section: Stimulimentioning

confidence: 99%

Chromatic collinear facilitation, further evidence for chromatic form perception

2006

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“…The second stage of the model describes the calculations of local and remote contrast, based on the multi-scale SORF responses. The third stage describes the adaptation of the second order (contrast-contrast induction) (Chubb, Sperling, & Solomon, 1989;Spitzer & Barkan, 2005;Xing & Heeger, 2001). This adaptation mechanism plays a role as a contrast gain control and is expressed by the adapted responses of the SORF cells.…”

Section: Modelmentioning

confidence: 99%

“…In the current scope, when only brightness contrast-contrast induction is examined, the brightness first-order adaptation is not modeled for the sake of simplicity. Accordingly the effect of brightness simultaneous contrast is not processed here since it is related to the adaptation of the first order (Spitzer & Barkan, 2005).…”

Section: Response Of the Second-order Opponent Receptive Fieldmentioning

confidence: 99%

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Brightness contrast–contrast induction model predicts assimilation and inverted assimilation effects

2008

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In classical assimilation effects, intermediate luminance patches appear lighter when their immediate surround is comprised of white patches and appear darker when their immediate surround is comprised of dark patches. With patches either darker or lighter than both inducing patches, the direction of the brightness effect is reversed and termed as "inverted assimilation effect." Several explanations and models have been suggested, some are relevant to specific stimulus geometry, anchoring theory, and models that involve high level cortical processing (such as scission, etc.). None of these studies predicted the various types of assimilation effects and their inverted effects. We suggest here a compound brightness model, which is based on contrast-contrast induction (second-order adaptation mechanism). The suggested model predicts the various types of brightness assimilation effects and their inverted effects. The model is composed of three main stages: (1) composing post-retinal second-order opponent receptive fields, (2) calculations of local and remote contrast, and (3) adaptation of the second-order (contrast-contrast induction). We also utilize a variation of the Jacobi iteration process to enable elegant edge integration in order to evaluate the model is performance.

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Chromatic adaptation to illumination investigated with adapting and adapted color

Phuangsuwan

Ikeda

2017

Color Research & Application

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The state of chromatic adaptation was investigated by using the two‐room technique. This technique involves a subject in a room who looks a white board in a separate test room through a window and judges the color of the window using the elementary color naming method. When the subject room is illuminated with a colored light and the test room with a white light, the window appears to be a very vivid color, for which the apparent hue depends on the color of the subject room. The color is referred to as the adapted color. The subject also evaluated the appearance of the illumination color of the subject room, which is called the adapting color. Two types of illuminating light in the subject room, fluorescent lamps with 7 colors and LED lamps with 19 colors, were employed. The adapting and the adapted colors were plotted on a polar diagram that was used in the opponent color theory, from which the hue angles were obtained. The hue angle difference between the two colors did not appear to be 180° except for one pair of adapting and the adapted colors, which implies that chromatic adaptation does not follow the opponent color concept. An improvement was achieved to explain the results by introducing complementary colors relation between the adapting and adapted color.

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Computational adaptation model and its predictions for color induction of first and second orders

Cited by 27 publications

References 47 publications

Chromatic collinear facilitation, further evidence for chromatic form perception

Chromatic collinear facilitation, further evidence for chromatic form perception

Brightness contrast–contrast induction model predicts assimilation and inverted assimilation effects

Chromatic adaptation to illumination investigated with adapting and adapted color

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