본 연구는 배경의 밝기와 색상 자극의 크기에 따라 인지될 수 있는 색의 차이가 있을 수 있다는 가정아래, 배경의 밝기를 차등적으로 적용하여 $2^{\circ}$와 $10^{\circ}$에 해당하는 자극의 크기를 비교하는 실험을 진행하였다. 실험결과, 배경의 밝기 및 실험 자극으로 사용된 Munsell 색상 속성의 조합에 따라 동일한 색상임에도 불구하고 colour를 각기 다르게 인지할 수 있다는 경향성을 볼 수 있었다. 실험 결과를 바탕으로 차후 대형 화면의 크기에서 모바일 크기의 화면으로 입력 영상이 전환 될 때 발생할 수 있는 색상 인지의 차이에 대해 본 실험 결과를 반영함으로써 모바일에서 가장 큰 이슈 중 하나인 전력 효율성이 반영 가능하며 2D 뿐만 아니라 3D나 홀로그램영상처리 시 효과적인 입체 영상 재현 및 화질에도 기여할 수 있다.
본 연구는 배경의 밝기와 색상 자극의 크기에 따라 인지될 수 있는 색의 차이가 있을 수 있다는 가정아래, 배경의 밝기를 차등적으로 적용하여 $2^{\circ}$와 $10^{\circ}$에 해당하는 자극의 크기를 비교하는 실험을 진행하였다. 실험결과, 배경의 밝기 및 실험 자극으로 사용된 Munsell 색상 속성의 조합에 따라 동일한 색상임에도 불구하고 colour를 각기 다르게 인지할 수 있다는 경향성을 볼 수 있었다. 실험 결과를 바탕으로 차후 대형 화면의 크기에서 모바일 크기의 화면으로 입력 영상이 전환 될 때 발생할 수 있는 색상 인지의 차이에 대해 본 실험 결과를 반영함으로써 모바일에서 가장 큰 이슈 중 하나인 전력 효율성이 반영 가능하며 2D 뿐만 아니라 3D나 홀로그램 영상처리 시 효과적인 입체 영상 재현 및 화질에도 기여할 수 있다.
This study, under the assumption that there may be a difference in colours recognized depending on background lightness and colour stimulus size, applied background lightness in a differential way and conducted an experiment by comparing the sizes of stimuli equivalent to $2^{\circ}$ and ...
This study, under the assumption that there may be a difference in colours recognized depending on background lightness and colour stimulus size, applied background lightness in a differential way and conducted an experiment by comparing the sizes of stimuli equivalent to $2^{\circ}$ and $10^{\circ}$. Based on the results, by reflecting the results of this experiment as a difference in colour recognition, which may occur when the input image is converted from a large-sized screen to a mobile-sized screen, power efficiency, one of the biggest issues, can be reflected in mobile devices and may contribute to effective three-dimensional image reproduction and image quality in 3-D or hologram as well as 2-D images.
This study, under the assumption that there may be a difference in colours recognized depending on background lightness and colour stimulus size, applied background lightness in a differential way and conducted an experiment by comparing the sizes of stimuli equivalent to $2^{\circ}$ and $10^{\circ}$. Based on the results, by reflecting the results of this experiment as a difference in colour recognition, which may occur when the input image is converted from a large-sized screen to a mobile-sized screen, power efficiency, one of the biggest issues, can be reflected in mobile devices and may contribute to effective three-dimensional image reproduction and image quality in 3-D or hologram as well as 2-D images.
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문제 정의
In other words, assuming that the degree of colour recognition might differ as content flows from the existing light-emitting display TV to mobile devices and the size of the colour stimulus differs, this study will examine the impacts of background lightness on the size of the colour stimulus.
This study aims to examine the tendency depending on background lightness and colour stimulus size. Based on the preceding research result that there was a tendency for the attributes of physically similar colours to be recognized differently as the size of the colour stimulus was changed, the study attempts to examine the difference in the degree of colour recognition on a light-emitting display.
제안 방법
The R, G and B values of the target colour for which the colour has been corrected were inferred using the Piecewise Linear interpolation assuming constant chromaticity coordinates (PLCC model) as CIE XYZ tristimulus values. Additionally, the inferred values of CIE XYZ tristimulus were transformed to CIECAM02, the characteristics of colour recognition were compared and analysed and the display used for the experiment was calibrated in the D65 environment using X-Rite i1 Pro2.
This study aims to examine the tendency depending on background lightness and colour stimulus size. Based on the preceding research result that there was a tendency for the attributes of physically similar colours to be recognized differently as the size of the colour stimulus was changed, the study attempts to examine the difference in the degree of colour recognition on a light-emitting display.
In order to adjust the target colour for each attribute of the reference colour, they were allowed to adjust it so that it looks the same as the reference colour using the slide bar for each attribute – H (Hue), S (Chroma) and V (Lightness) – using the HSV colour space; select one background lightness out of the selected background lightnesses; and, if they finished colour matching of 30 colours (10 types of colour x 3 steps of lightness), the experiment was converted to a different background lightness for evaluation.
In other words, with 10 typical Munsell Colours (Hue)x 3 kinds of lightness (V) applicable to the 10 representative Munsell Colours x 3 kinds of background lightness, an experiment was conducted, in which the colour was adjusted in the stimulus in a size of 2° (target colour) compared with a stimulus in a size of 10° (reference colour).
Ten representative colours (5.0R, 5.0YR, 5.0Y, 5.0GY, 5.0G, 5.0BG, 5.0B, 5.0PB, 5.0P and 5.0RP) were selected as the colours used in the experiment among the colours in the Munsell Colour Specification System, and XYZ, the measures of physical colour of each selected colour were used after being modified to the values of CIE XYZ tristimulus corresponding to the D65 light source. As shown in Table 1, the Munsell Value (V) of each colour selected for the experiment was set to 5, 6 and 7, that is, three steps, and the Munsell Chroma (C) was set to a fixed value of 8.
The C light source (X=98.07, Y=100, Z=118.25), the basic light source value of the Munsell Data, was changed to the values of XYZ tristimulus to which the D65 light source (X=95.047, Y=100, Z=108.883) was applied, and this is the same as the set light source value of the display to be used in the experiment.
Therefore, under the assumption that background lightness as well as the size of the stimulus might be another variable that causes a difference in colour recognition, this study used the experimental method of colour matching, which corrects a target colour to a reference colour by comparing the reference colour with the target colour on a light-emitting display. The R, G and B values of the target colour for which the colour has been corrected were inferred using the Piecewise Linear interpolation assuming constant chromaticity coordinates (PLCC model) as CIE XYZ tristimulus values. Additionally, the inferred values of CIE XYZ tristimulus were transformed to CIECAM02, the characteristics of colour recognition were compared and analysed and the display used for the experiment was calibrated in the D65 environment using X-Rite i1 Pro2.
In order to adjust the target colour for each attribute of the reference colour, they were allowed to adjust it so that it looks the same as the reference colour using the slide bar for each attribute – H (Hue), S (Chroma) and V (Lightness) – using the HSV colour space; select one background lightness out of the selected background lightnesses; and, if they finished colour matching of 30 colours (10 types of colour x 3 steps of lightness), the experiment was converted to a different background lightness for evaluation. The subjects were allowed to have sufficient time to adjust the target colour to the reference colour, and the experiment was conducted after sufficient adaptation was made so that they could adjust themselves to the dark room environment before the experiment. When the background lightness was changed, the same adaptation was applied so that change in lightness would not cause any bias.
Therefore, under the assumption that background lightness as well as the size of the stimulus might be another variable that causes a difference in colour recognition, this study used the experimental method of colour matching, which corrects a target colour to a reference colour by comparing the reference colour with the target colour on a light-emitting display. The R, G and B values of the target colour for which the colour has been corrected were inferred using the Piecewise Linear interpolation assuming constant chromaticity coordinates (PLCC model) as CIE XYZ tristimulus values.
This study analysed, through a psychophysical experiment, the characteristic of visual perception as sensitive to the lightness of light depending on background lightness as well as the size of the colour stimulus. Unlike the result of the preceding research that found the colour is recognized as lighter and more colourful as the size of the colour stimulus increases, this study found a tendency in which the attributes of the colour may be recognized differently depending on background lightness and the contrast ratio between the background lightness and the reference colour lightness, regardless of the size of the stimulus.
To this end, it will be necessary to conduct not only an additional experiment that classifies the background lightness in a more differential way from the reference colour and specifies the difference clearly, but also an experiment on a variety of experimental stimuli. This will serve as a basis to investigate and reveal the visual characteristics of the recognition of colours in addition to the size of the stimuli based on an experiment adding other elements of environment variables as well as background lightness.
To infer the colour values corrected by each subjet on the display with the measures of physical colours, it is necessary to analyse the characteristics of the display used in the experiment accurately and infer the values to analyse the differences in colour recognition more accurately. Thus, with the Munsell colours used in the experiment, the differences between the inferred colour values were examined using the measures of substantial physical colours and the PLCC model. Generally, Monitor Device Characterization models can be summarized by drawing a formula of interaction between the normalized Digital-to-Analog Converter (DAC) of each of the R, G and B channels and the corresponding normalized luminance.
To infer the colour values corrected by each subjet on the display with the measures of physical colours, it is necessary to analyse the characteristics of the display used in the experiment accurately and infer the values to analyse the differences in colour recognition more accurately. Thus, with the Munsell colours used in the experiment, the differences between the inferred colour values were examined using the measures of substantial physical colours and the PLCC model.
In future studies, an experiment should be conducted in which an algorithm is implemented so that it can be applied to the difference in colour recognition, which may occur when there is a conversion of the input image from a large-sized screen to a mobile sized screen. To this end, it will be necessary to conduct not only an additional experiment that classifies the background lightness in a more differential way from the reference colour and specifies the difference clearly, but also an experiment on a variety of experimental stimuli. This will serve as a basis to investigate and reveal the visual characteristics of the recognition of colours in addition to the size of the stimuli based on an experiment adding other elements of environment variables as well as background lightness.
대상 데이터
The display used in this experiment was an LCD Monitor with a screen size of 22 inches and the maximum screen resolution of 1680 x 1050. The characteristics of the calibrated display are shown in the graph below.
81cm) was made, with 10° as a reference colour and 2° as a target colour, which the subject could directly control with a colour that looked the same as the reference colour. The viewing distance between the display and the subject was set to 50cm, and with 10 subjects with normal vision, the experiment was conducted in a dark room.
성능/효과
As The experimental result showed that the relatively bigger the size of the stimulus, the lighter and more colourful the recognized colour became, while, the difference in the degree of colour recognition according to the change in background lightness played a significant role as another variable in addition to the size of the stimulus. Experimental result data were analysed using Coefficient Variation (CV), and the formula is as follows:
It was found that, for J equivalent to lightness in CIECAM02, the lower the background lightness, the lighter the target colour as perceived relative to the reference colour, while for C equivalent to Chroma in CIECAM02, the lighter the background, the less colourful the reference colour is perceived relative to the target colour. This means that not only the bigger the size of the colour stimulus, the more different the colour becomes recognized, but also even if the size of the colour stimulus is relatively small, the colour may be recognized as more colourful or lighter depending on the background lightness corresponding to the surrounding environment.
참고문헌 (16)
Backhaus W., Kliegl R., Werner J. S., "Color vision : perspectives from different disciplines", New York, Walter de Gruyter & Co., 1998.
Bartleson C. J., "Predicting corresponding colors with changes in adaptation", In Color Research & Application, 1979.
Fairchild M. D., "Color Appearance Models", New York, Addison-Wesley, 1998.
Fairchild M. D., "A model of incomplete chromatic adaptation", Proc. the 22nd Session of the CIE, 1991.
Fairchild M. D., "Formulation and testing of an incomplete-chromatic adaptation model", In Color Research & Application, 1991.
CIE TC1-34 Final Report, The CIE 1997 Interim Color Appearance Model (Simple Version), 1998.
MacAdam D. L., "Color Measurement", New York, Springer-Verlag Berlin Heidelberg, 1981.
Breneman E. J., "Corresponding chromaticities for different states of adaptation to complex visual fields", In Journal of Optical Society of America, 1987.
Moroney N., Fairchild M. D., Hunt R. W. G., Li C., Luo M. R., & Newman T., "The CIECAM02 color appearance model", In The 10th Color imaging conference, 2002.
Li C. J., Luo M. R., Hunt R. W. G., Moroney N., Fairchild M. D., & Newman T., "The performance of CIECAM02", In IS&T/SID CIC 10, 2002.
Abramov I., Gordon J., & Chan H., "Color appearance across the retina : effects of a white surround", In Journal of Optical Society of America, 1992.
Tedford W. H., Bergquist S. L., & Flynn W. E., "The Size Color Illusion", In Journal of General Psychology, 1977.
Warden C. J., Flynn E. L., "The Effect of Color on Apparent Size and Weight", In The America Journal of Psychology, 1926.
Billger M., "Evaluation of Color Reference Box as an Aid for Identification Color Appearance in Rooms", In Color research and Application, 2000.
Kutas G., Bodorogi G. P., & Shanda J., "Color Size Effect", In 10th Congress of the International Color Association, 2004.
Xiao K., Luo M. R., Li C., Cui G., Park D. S., "Investigation of Color Size Effect for Color Appearance Assessment", In Color research and Application, 2011.
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