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Method for calibrating maximum gray equivalent substitution range of metamerism

A metamerism and maximum grayscale technology, applied in image data processing, structured data retrieval, instruments, etc., can solve problems such as color errors

Pending Publication Date: 2021-04-13
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metameric objects can cause extreme color errors in print production

Method used

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  • Method for calibrating maximum gray equivalent substitution range of metamerism
  • Method for calibrating maximum gray equivalent substitution range of metamerism
  • Method for calibrating maximum gray equivalent substitution range of metamerism

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Embodiment Construction

[0033] Implementing any technical solution of the embodiments of the present application does not necessarily need to achieve all the above advantages at the same time.

[0034] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the embodiments of the present application shall fall within the protection scope of the embodiments of the present application.

[0035] The specific implementation of the embodiment of the present application will be further described below in conjunct...

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Abstract

The embodiment of the invention provides a method for calibrating the maximum gray equivalent substitution range of metamerism. The method comprises the steps of converting a CMYK image source into an RGB image source; determining channel data of each color in the CMYK image source and the RGB image source; generating full-sample data according to the extracted channel data of each color; performing sparse processing on the full sample data to obtain sparse sample data; extracting metamerism data from the sparse sample data, carrying out gray equivalent substitution algorithm processing on discrete distribution points in the metamerism data, and then carrying out dynamic fitting on the discrete distribution points and the extracted metamerism data to obtain a space fitting curve; and performing error detection on the space fitting curve to calibrate the maximum gray equivalent substitution range of the metamerism data. According to the embodiment of the invention, color errors generated by printing color duplication are reduced.

Description

technical field [0001] The embodiments of the present application relate to technical fields such as image processing technology and printing anti-counterfeiting, and in particular to a method for calibrating the equivalent replacement range of the maximum gray scale of metamerism. Background technique [0002] Both RGB and CMYK are color representation spaces related to devices (such as scanners and monitors). For example, even if different scanners scan the same image, they will get different output files; for another example, different monitors display the same image. There will also be different display effects. [0003] Among them, for the CMYK color space applied to the printing field, based on the three color materials of cyan (C), magenta (M) and yellow (Y), the dots on the four-color printing plates of C, M, Y, and K are transferred to Printing ink to the substrate to get the color and tone of the desired image. In the CMYK color space, each CMYK value corresponds...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/90G06F16/25G06F16/22G06F16/242G06F16/248G06F30/20
CPCG06T7/001G06T7/90G06F16/25G06F16/2228G06F16/2433G06F16/248G06F30/20G06T2207/10024G06T2207/30144Y02P90/30
Inventor 曹鹏吕光武
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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