Degree of Metamerism

Nimeroff, I.; Yurow, J. A.

doi:10.1364/josa.55.000185

Cited by 42 publications

(20 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the CIE color domain, the use of a color distance metric ΔE ab is well known. The weighted Nimeroff 's index [33] is used in the color industry as a measure of metamerism in the CIE domain [34] and is defined in [33] as…”

Section: Observer Metamerismmentioning

confidence: 99%

See 1 more Smart Citation

Metrics and statistics of frequency of occurrence of metamerism in consumer cameras for natural scenes

Prasad

Wenhe

2015

J. Opt. Soc. Am. A

View full text Add to dashboard Cite

This paper presents metrics and statistics of frequency of occurrence of metamerism in three consumer cameras, viz., Canon 1D Mark III, Nikon D40, and Sony α7, using spectral and RGB images of natural scenes. Both sensor metamerism and observer metamerism of the cameras' sensors are studied. We use the concept of dissimilarity of two spectral power distributions in the spectral domain and the RGB domain for studying the occurrence sensor metamerism. Specifically, we use angular difference and digital equivalence approaches for this purpose. For studying the occurrence observer metamerism, we use the weighted Nimeroff's index for dissimilarity in the spectral domain with respect to the CIE color space along with the conventionally used CIE LAB color difference for dissimilarity in the CIE color space. The statistics of the frequency of occurrence of metamerism are generated on a dataset of 423 spectral images of indoor scenes in 5 illumination conditions and outdoor scenes in natural illumination conditions. Experiments show that about 18%-22% of the pixels in the images are metameric in the sense of angular difference. It is also observed that 1%-4% of the colors that would have appeared similar to human eyes are reproduced as distinct colors in the cameras. Dataset and details can be found at https://sites.google.com/site/dilipprasad/source-codes.

show abstract

Section: Observer Metamerismmentioning

confidence: 99%

“…We have chosen W 0 0.01 heuristically according to Fig. 1 of [33]. ΔE ab is computed as the difference in the LAB color values of two pixels [35].…”

Section: Observer Metamerismmentioning

confidence: 99%

Metrics and statistics of frequency of occurrence of metamerism in consumer cameras for natural scenes

Prasad

Wenhe

2015

J. Opt. Soc. Am. A

View full text Add to dashboard Cite

show abstract

“…This variation in the eye's sensitivity at different wavelengths can be included by weighting the spectral differences with spectral sensitivity curves (x y z λ λ λ , , ) of our eyes (cones) -commonly known as colour matching functions. Such an index proposed by Nimeroff and Yurow (1965) is as follows (Equation [5.16]):…”

Section: General Indices Of Metamerismmentioning

confidence: 99%

Metamerism and shade sorting

Choudhury

2015

Principles of Colour and Appearance Measurement

View full text Add to dashboard Cite

“…Though much research has been carried out relating to the metamerism [13]- [17], we propose a metric to evaluate the image quality metamerism calculated from the spectral information, color information, and texture information. At first, we describe about the color metamerism.…”

Section: Definition Of the Metricmentioning

confidence: 99%

Detection of image quality metamers based on the metric for unified image quality

Miyata

Tsumura

2012

SPIE Proceedings

View full text Add to dashboard Cite

In this paper, we introduce a concept of the image quality metamerism as an expanded version of the metamerism defined in the color science. The concept is used to unify different image quality attributes, and applied to introduce a metric showing the degree of image quality metamerism to analyze a cultural property. Our global goal is to build a metric to evaluate total quality of images acquired by different imaging systems and observed under different viewing conditions. As the basic step to the global goal, the metric is consisted of color, spectral and texture information in this research, and applied to detect image quality metamers to investigate the cultural property. The property investigated is the oldest extant version of folding screen paintings that depict the thriving city of Kyoto designated as a nationally important cultural property in Japan. Gold colored areas painted by using high granularity colorants compared with other color areas in the property are evaluated based on the metric, then the metric is visualized as a map showing the possibility of the image quality metamer to the reference pixel.

show abstract

Degree of Metamerism

Cited by 42 publications

References 5 publications

Metrics and statistics of frequency of occurrence of metamerism in consumer cameras for natural scenes

Metrics and statistics of frequency of occurrence of metamerism in consumer cameras for natural scenes

Metamerism and shade sorting

Detection of image quality metamers based on the metric for unified image quality

Contact Info

Product

Resources

About