Computing method for complex frequency spectrum chromaticity diagram and color characteristic value
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A technology of color characteristics and numerical calculation, which is applied in the direction of color measurement device, spectrometry/spectrophotometry/monochromator, radiation pyrometry, etc., and can solve the problem of inconvenient solution of tristimulus value
Inactive Publication Date: 2008-01-23
庞多益 +1
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Simply put, in the range of visible light, the complex spectral chromaticity diagram of the two-dimensional plane is used to replace the tri-stimulus value in the three-dimensional space widely used now, to describe and analyze the color, and to solve the inconvenience of the tri-stimulus value. Problems solved (such as color balance problems, color difference calculation problems)
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[0031] 1. Transform the spectral function s(λ)·ρ(λ) or s(λ)·τ(λ) into a complex spectral function r(θ)
[0032] Transform the spectral function s(λ)·ρ(λ) or s(λ)·τ(λ) measured by a spectrophotometer that measures visible light (wavelength between 390nm and 780nm), and the method of transformation is based on ν = c λ , that is, transform the independent variable wavelength λ into frequency ν in the spectral function. On the complex spectral chromaticity diagram, the frequency range of visible light is from ν at the red end 0 2ν to the purple end 0 , the frequencies of this one octave are evenly distributed on the 360° complex plane in polar coordinates. So the calculation to convert frequency ν to angle θ is . Among them, θ is the angle corresponding to the frequency on the complex spectral chromaticity diagram, ν is the frequency of visible light, and ν 0 It is the frequency at the red end of visible light...
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Abstract
The invention provides a calculating method for a complex frequency spectrum chromatic diagram and color characteristic values, which pertains to the field of chromatometry for measuring and calculating the chroma of visible light. Wherein, a spectrum function s(Lambada) is multiplied by Rho (Lambada) or s(Lambada) is multiplied by Tau (Lambada) got by a spectrophotometer of visible light is transformed into a vector function of complex frequency spectrum Eta (Theta), the monochromic light of each frequency is a color vector. By integrating, such color characteristic values as color intensity C, color hue H, color balance Ba, color saturation level S and color brightness L are obtained for the color light. Taking above as a platform, the composition of two different colors can be predicated, so as to predicate their composition efficiency Eta c and balancing efficiency Eta ba, also color-difference (Delta L and Delta c) calculation can be carried out for two similar colors. In addition, the derivation of the complex frequency spectrum chromatic diagram and color characteristic values can also be used for color decomposition, color composition, color measurement, color transferring, and color-mating calculation, etc. The invention is applicable for such fields as photography, picture taking, color TV, color picture developing, printing, dyeing, painting, coating, illumination, identification and transmitting of color signals, color matching of clothes and determining of decoration colors, etc.
Description
Technical field: [0001] Where there is light, there is color. All fields involving the reception, measurement, modulation, transmission, synthesis, and restoration of light and color, such as photography, photography, color TV, color expansion, printing (including color copying, color inkjet, color printing, etc.), printing and dyeing, paint, coating, Many fields of modern science and technology such as lighting, identification and transmission of color signals, color matching of clothing, determination of decorative colors, design of color advertisements, artificial vision, etc., are all application fields of the present invention. Background technique: [0002] Grating CCD visible light spectrophotometry technology, fiber optic light guide technology, computer software technology. Invention content: [0003] Perform a series of data conversion and data processing on the spectral function measured by the visible light spectrophotometer, and obtain the color characteristi...
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