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Neugebauer equation correction method based on tristimulus values

A tri-stimulus value, Newcastle technology, applied in image data processing, instruments, calculations, etc., can solve the problems of complex Newcastle equation correction and low precision, and achieve accurate prediction of unknown colors, high equation accuracy, and practical value. high effect

Active Publication Date: 2017-08-11
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for revising the Nusseltberg equation based on three stimulus values, which optimizes the Neusselberger equation, improves the precision of the Neusselberger equation, and solves the problem of complicated and low-precision correction of the existing Neusselberger equation. question

Method used

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  • Neugebauer equation correction method based on tristimulus values
  • Neugebauer equation correction method based on tristimulus values
  • Neugebauer equation correction method based on tristimulus values

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Embodiment

[0059] Taking the dot area ratios of 20%, 50%, and 80% as examples, the correction process of the Neusselberger equation based on the XYZ tristimulus values ​​will be described in detail.

[0060] (1) According to the requirements of "G7 Printing Color Standardization" to print the standard documents that meet the requirements, use the X-RITE528 spectrodensitometer to measure the different dot areas of the standard documents: 5%, 10%, 20%, 30%, 40%, 50%, 60% %, 70%, 80%, 90%, 95%, 100% of the actual measured density value D, the actual measured dot area ratio a and the actual measured tristimulus value XYZ.

[0061] (2) Select the actual measured density value D at the dot area ratio of 20%, 50%, and 80% in (1), and then substitute the actual measured density value D into the Marie Davis formula to calculate the calculated dot area ratio a 0 . Compare the dot area ratio a at 20%, 50%, and 80% actually measured by the density meter with the dot area ratio a at 20%, 50%, and 8...

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Abstract

The invention discloses a Neugebauer equation correction method based on tristimulus values. First, the consistency between the actually measured dot area rate and the dot area rate calculated by the Marie Davis formula is compared. Then, the calculated dot area rate is substituted into the Neugebauer equation to verify the consistency of the XYZ tristimulus values. In the case of inconsistence, the inverse calculation of the Neugebauer equation is performed to obtain the dot area rate, and the dot gain curve is further made. Finally, the curve is fitted to obtain afitting function and the correction of the Neugebauer equation is completed. The correction method is simple in calculation, high in calculation accuracy and high in equation precision, can accurately predict the unknown color and achieve replacement of the big color target with the small color target in the printing color separation, and has high practical values.

Description

technical field [0001] The invention belongs to the technical field of color separation of printed matters, and in particular relates to a method for correcting the Neusselberger equation based on tristimulus values. Background technique [0002] The Neusselberger equation is a print color rendering equation established based on the printing dot model and Grassmann's color mixing law. The equation is as follows: [0003] [0004] [0005] [0006] In today's era of digital plate making and digital printing, the Neusselberger equation has more important practical value and has become one of the most basic formulas for calculating the color of printed matter. In the color management software, the Neusselberger equation is an important means to establish the color characteristic description file of the output device. The Neusselberger equation not only clarifies the coloring mechanism of printed matter from the perspective of chromatics, but also provides a method of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/90
CPCG06T2207/10024G06T2207/30144
Inventor 郭凌华孙栗媛张欣亚
Owner SHAANXI UNIV OF SCI & TECH
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