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Method for reproducing high dynamic range image on paper media based on digital inkjet printing

A high dynamic range, digital printing technology, applied in printing, image communication, copy/marking methods, etc., can solve the problem of halo, excessive loss of details, etc., to eliminate the halo phenomenon and improve the effect of visual perception

Inactive Publication Date: 2017-07-18
QILU UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although tone mapping uses the method of global mapping and local mapping to solve some problems, there are still phenomena such as excessive loss of details and halos caused by over-compression of the dynamic range.

Method used

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  • Method for reproducing high dynamic range image on paper media based on digital inkjet printing
  • Method for reproducing high dynamic range image on paper media based on digital inkjet printing
  • Method for reproducing high dynamic range image on paper media based on digital inkjet printing

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Embodiment 1

[0038] Such as figure 1 Shown, overall flow process of the present invention comprises the following steps:

[0039] Step 1, measure the properties of the paper medium, select 6 paper samples, numbered 1#, 2#, 3#, 4#, 5# and 6#, the optical properties are whiteness, opacity; the physical properties are quantitative, smoothness , stiffness and porosity. The specific implementation method of this step adopts the existing method, which will not be repeated here.

[0040] Step 2, according to figure 2 The flow shown is to use the 7-color ink of the inkjet digital printing machine to make the paper characteristic file. Paper linearization is completed through digital proofing software and printers, and paper characterization files are generated. Paper characterization files record the matching relationship between the current printer, ink and paper, and the combination of the three color information. restoring ability, such as image 3 and Figure 4 .

[0041] Step 3, read ...

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Abstract

The invention discloses a method for reproducing a high dynamic range image on paper media based on digital inkjet printing. The method comprises the following specific steps of measuring to obtain a dynamic range and coloration characteristics of the inkjet printing paper media; computing to obtain intensity information I0 of the high dynamic range image; processing the intensity information I0 of the high dynamic range image to obtain a brightness layer L1 and a detail layer D1; carrying out filtering processing on the brightness layer L1 to obtain a brightness layer L2 and a detail layer D2; carrying out filtering processing on the brightness layer L2 to obtain a brightness layer L3 and a detail layer D3; compressing the brightness layers through compression functions; respectively adopting enhancement coefficients to carry out enhancement processing on the detail layers according to the coloration characteristics of the paper media; and carrying out reverse summation on each layer of processed image according to the attributes of the inkjet printing paper media in order to obtain a printing output image. According to the method, the high dynamic range image is directly reproduced on the paper media, so that a problem of excessive loss of image levels is avoided, the image detail information is enhanced, and the requirements for reproducing the high dynamic range image on the paper media are met.

Description

technical field [0001] The invention belongs to the technical field of digital printing image processing and reproduction, and in particular relates to a high dynamic range image paper medium reproduction method based on inkjet digital printing. Background technique [0002] A high dynamic range image is a scene-related image with a dynamic range generally exceeding 1000:1, which can record most of the scene perceived visually. High dynamic range images are increasingly used in fields such as high-definition movies, game special effects, telemedicine, remote sensing satellites, and printing and reproduction. However, at present, high dynamic range images themselves cannot be directly reproduced on low dynamic range media, especially paper media. [0003] The reproduction of high dynamic range images by existing paper media is much smaller than the perceivable dynamic range of the human eye, and is also smaller than the range of reproduction of high dynamic range images by L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/032H04N1/32H04N1/407H04N1/409B41M5/00
CPCH04N1/32251B41M5/00H04N1/032H04N1/4078H04N1/409
Inventor 李效周赵洋
Owner QILU UNIV OF TECH
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