Experimental driven modelling of the color appearance of unrelated self-luminous stimuli: CAM15u

Withouck, Martijn; Smet, Kevin; Ryckaert, Wouter; Hanselaer, Peter

doi:10.1364/oe.23.012045

Cited by 30 publications

(67 citation statements)

References 23 publications

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“…This results in an increasing brightness with increasing saturation level. Note that the model does not explicitly incorporate an additional H-K term in the brightness expression as opposed to CAM97u (Hunt, 1991), CAM15u (Withouck et al, 2015b) and CAM18sl .…”

Section: Prediction Of the Helmholtz-kohlrausch Effectmentioning

confidence: 99%

“…However, the application of such CAMs on self-luminous stimuli faces some challenges, such as the ambiguity of the definition of the reference white and the underestimation of the Helmholtz-Kohlrausch effect . To overcome these challenges, a number of colour appearance models such as CAMFu (Fu et al, 2012), CAM15u (Withouck et al, 2015b) and CAM18sl have been established, to predict the perception of a self-luminous stimulus which is either unrelated or surrounded by a uniform and neutral background. All the aforementioned models generally assume a basic test scene which includes a uniform stimulus on a uniform background and surround.…”

Section: Introductionmentioning

confidence: 99%

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Applying an Image Colour Appearance Model for Simple Self-Luminous Scenes

Phung

Leloup

Smet

et al. 2019

PROCEEDINGS OF the 29th Quadrennial Session of the CIE

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Colour Appearance Models (CAM) usually assume a simple test scene of a uniform flat stimulus, background and surround. To consider the spatial information and extend the predictions of CAMs to more complex scenes, Image CAMs such as 'iCAM' are developed, which takes an image as the input and outputs the perceptual attributes per pixel. This paper presents the results of a study in which the performance of iCAM to predict the effects of various parameters on brightness perception, when applied to simple self-luminous scenes, is evaluated. The results show that iCAM can predict the effect of certain background luminance scenarios, however, the outcomes for unrelated stimuli do not match with the reference data. Furthermore, the impact of saturation and of stimulus size on brightness is not predicted by iCAM since both the Helmholtz-Kohlrausch and the stimulus size effect are not included in the model. Hence, a new image CAM for self-luminous scenes is needed.

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Section: Prediction Of the Helmholtz-kohlrausch Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Applying an Image Colour Appearance Model for Simple Self-Luminous Scenes

Phung

Leloup

Smet

et al. 2019

PROCEEDINGS OF the 29th Quadrennial Session of the CIE

Self Cite

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show abstract

“…The model can be used to predict the appearance of colors under various viewing conditions including a range of stimulus sizes, levels of illumination from scotopic to photopic, and related and unrelated stimuli. The model “CAM15u”, is derived to estimate the color appearance of an unrelated self‐luminous stimuli by utilizing the CIE 2006 cone fundamentals. This model is applicable to unrelated self‐luminous stimuli with an angular extent of 10° and a photopic, non‐glare‐inducing, luminance level.…”

Section: Color Appearance and Color Emotion Modelsmentioning

confidence: 99%

Hue and warm‐cool feeling as the visual resemblance criteria for iso‐CCT judgment

Kwak

2018

Color Research & Application

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The hue perception and ‘warm‐cool’ feelings were investigated, in response to various lighting settings, following the adaptation to either 3500K or 5000K to compare which one—between conventional iso‐Correlated Color Temperature (CCT) and a new one based on CIE u'v′ color space—is more compatible with the visual perception. Twenty participants evaluated hue and warm‐cool feelings for 48 test lighting settings, by observing an empty gray booth. The results showed that yellow‐blue and ‘warm‐cool’ feelings are closely located around the Planckian locus, while red‐green roughly follows the line orthogonal to the Planckian locus in CIE u'v′ color space, at both 3500 K and 5000 K settings. This suggests that u'v′ color space correlates better with human perception.

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“…The application of CIECAM02 to these types of stimuli encounters some challenges, such as the ambiguity of the reference white due to the fact that the spectral radiance of the stimulus and the background are totally independent. To overcome these challenges, CAM15u for unrelated self‐luminous stimuli and the more general CAM18sl for related self‐luminous stimuli have been proposed, although the effects of background size and stimulus size are not included in the latter model.…”

Section: Introductionmentioning

confidence: 99%

Assessing the application of an image color appearance model to basic self‐luminous scenes

Phung

Leloup

Smet

et al. 2019

Color Research & Application

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Image color appearance models (Image CAMs) have been developed to predict the perception of complex scenes and are mainly used for image rendering and video reproduction applications. Among these Image CAMs, iCAM is an Image CAM that takes an image as the input and provides the perceptual attributes for each pixel. On the other hand, nonimaging CAMs are widely used and validated, but they always assume a simple test scene of a uniform flat stimulus, a quasi‐neutral background, and a surround. This study presents an evaluation of the performance of iCAM when applied to these simple self‐luminous scenes in predicting the influence of background luminance, background size, saturation, and stimulus size on stimulus brightness. The results show that iCAM is capable of predicting the effect of background luminance and some background size scenarios. However, for unrelated self‐luminous stimuli (dark background), the model predictions do not match the reference data. An evaluation of the effect of the filter kernel size and its relation to the physiological mechanism of image processing inside the visual system has been investigated. Furthermore, the impact of saturation and stimulus size on brightness seems to be underestimated by the model, because the Helmholtz‐Kohlrausch and stimulus size effects are not included. Hence, these findings call for an enhanced Image CAM.

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Experimental driven modelling of the color appearance of unrelated self-luminous stimuli: CAM15u

Cited by 30 publications

References 23 publications

Applying an Image Colour Appearance Model for Simple Self-Luminous Scenes

Applying an Image Colour Appearance Model for Simple Self-Luminous Scenes

Hue and warm‐cool feeling as the visual resemblance criteria for iso‐CCT judgment

Assessing the application of an image color appearance model to basic self‐luminous scenes

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