Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Large breadth scanning color aberration correcting method based on complex frequency spectrum chrominance principle

A complex spectrum, large format technology, applied in the field of color chromatic aberration correction of large format scanning based on complex spectrum chromaticity theory, can solve the problems of manual correction, inability to reflect the pure physical color information of objects, and unsatisfactory correction effect, so as to improve the The effect of the scan effect

Active Publication Date: 2014-03-26
中国印刷科学技术研究所
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The linear array CCD used in large-format scanning uses color filters to obtain the RGB three-color information of the scanned image. The color information obtained in this way can only reflect the reflection of the spectral bands transmitted by the three color filters of the scanned object, and cannot It cannot reflect the spectral reflectance information of the entire visible spectrum well, so it is easy to have a deviation between the scanned color and the real color during the scanning process, and the scanned color needs to be corrected
[0003] At present, the calibration of scanned colors at home and abroad is to establish the corresponding relationship between the real color and the scanned color through the CIELab chromaticity space, and the CIELab chromaticity value is based on the human visual matching experiment results: CIE1931 standard chromaticity observer spectrum On the tristimulus value, calculated on this basis, cannot reflect the pure physical color information of the object
At present, the CIELab chromaticity space used in the color correction of large-format scanning has more human factors in it, and the correction effect is not ideal. It is often necessary to manually correct the scanned image in the later stage.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Large breadth scanning color aberration correcting method based on complex frequency spectrum chrominance principle
  • Large breadth scanning color aberration correcting method based on complex frequency spectrum chrominance principle
  • Large breadth scanning color aberration correcting method based on complex frequency spectrum chrominance principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The above and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

[0025] The ColorChecker produced by X-Rite is used as the calibration guide table for reflective scanners, such as figure 2 , the guide table has 24 solid color blocks, marked as 1~24 from left to right and then from top to bottom. According to RGB to distinguish, the RGB data of each color block is as follows image 3 , taking Purple No. 10 as an example, use a spectrophotometer to measure the spectral reflectance of the Dark Skin color block, and calculate the complex spectral brightness L=26.45, complex spectral hue H=302.21, and complex spectral reflectance of the color block according to the spectral reflectance of the color. Spectrum color saturation S=21.62, the method of obtaining complex spectral parameters of color blocks through spectral reflectance calculation refers to patent CN...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a large breadth scanning color aberration correcting method based on a complex frequency spectrum chrominance principle, and provides a method for effectively correcting large breadth scanning color aberration. The large breadth scanning color aberration correcting method based on the complex frequency spectrum chrominance principle comprises the steps of firstly, obtaining spectral reflectance of color lumps of a reflecting type scanner correcting guide list through measurement, calculating complex frequency spectrum HLS values of all the color lumps, establishing a corresponding relation of a color value RGB and the complex frequency spectrum HLS of the same color lump, scanning the reflecting type scanner correcting guide list by using a large breadth scanner, obtaining the actual scanning color information R'G'B' of each color lump of the reflecting type scanner correcting guide list through the large breadth scanner, calculating complex frequency spectrum color characteristic values H'L'S' according to the corresponding relations, correcting colors according to the differences between the complex frequency spectrum values HLS and the complex frequency spectrum color characteristic values H'L'S' to obtain the complex frequency spectrum H''L''S'' values after the correction of the large breadth scanner, and obtaining color values R''G''B'' corrected and output through the complex frequency spectrum H''L''S'' are corrected, namely, the color values R''G''B'' are the color values of large breadth scanning colors.

Description

technical field [0001] The invention relates to the technical field of printing, in particular to a method for correcting color chromatic aberration of large-format scanning based on complex spectrum chromaticity theory. Background technique [0002] The linear array CCD used in large-format scanning uses color filters to obtain the RGB three-color information of the scanned image. The color information obtained in this way can only reflect the reflection of the spectral bands transmitted by the three color filters of the scanned object, and cannot The spectral reflectance information of the entire visible spectrum cannot be well reflected, so during the scanning process, it is easy to have a deviation between the scanned color and the real color, and the scanned color needs to be corrected. [0003] At present, the calibration of scanned colors at home and abroad is to establish the corresponding relationship between the real color and the scanned color through the CIELab c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/60G01J3/46
Inventor 庞也驰李志杰虞朝阳褚庭亮陈彦
Owner 中国印刷科学技术研究所
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products