Green noise halftone algorithm based on minimum developing error laser printer model

A laser printer and half-tone technology, applied in image communication, electrical components, etc., can solve the problems of finding the optimal parameters of the printer model, and the change of gray scale that does not conform to human vision

Inactive Publication Date: 2014-03-05
WUHAN UNIV
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the density value and reflectivity do not conform to the gray scale change of human eyes, the optimal parameters of the printer model canno

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
  • Green noise halftone algorithm based on minimum developing error laser printer model
  • Green noise halftone algorithm based on minimum developing error laser printer model
  • Green noise halftone algorithm based on minimum developing error laser printer model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0071] In the following, Pantum2000 laser printer is used as the target printer, Zhiguan brand high-white copy paper is used for printing output, the measuring device is Eyeone colorimeter, and lena test chart is used as the image to be processed as an example, and the ordinary green noise halftone algorithm is used as a comparison. The present invention is further described by scanning halftone printout images using a 1200 dpi high-resolution scanner.

[0072] please see figure 1 , figure 2 , the technical scheme adopted in the present invention is: a kind of green noise halftone algorithm based on the minimum color rendering error laser printer model, it is characterized in that, comprises the following steps:

[0073] Step 1: Obtain the corresponding optimal parameters by calculating the minimum color rendering error of the test image T 1 , T 2 Combination; its specific implementation includes the following sub-steps:

[0074] Step 1.1: See Figure 4 , draw 600 × 60...

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 discloses a green noise halftone algorithm based on a minimum developing error laser printer model, and belongs to halftone screen dot generating methods in the field of image hard copy copying. Due to the fact that a printer has dot gain and dot loss nonlinear warp, and the nonlinear warp needs to be simulated by using the printer models. Currently, density or the reflecting rate are commonly used by the printer model for converting a measuring result, and due to the fact that the density and the reflecting rate do not conform to the linear changes of the gray level of human vision, the parameters of the printer model can be decided through multiple times of printing amount. According to the green noise halftone algorithm based on the minimum developing error laser printer model, printing output results are converted into Munsell lightness values, the optical parameters of the printer model are calculated, and the laser printer model with the maximum developing error is obtained and applied to the green noise halftone algorithm. Only one time of the printing measurement is needed, and the printer model corresponding to the generated optimal parameters well restrains the nonlinear warp of the printer.

Description

technical field [0001] The invention belongs to the field of digital image processing, and relates to a halftone processing method, in particular to a green noise halftone algorithm based on a minimum color rendering error laser printer model. Background technique [0002] Due to the lack of physical diffusion of toner and insufficient electrostatic charge adsorption capacity, the printer will experience dot gain and dot loss, which are also known as printer nonlinear distortion. The nonlinear distortion of the printer will cause the gray level of the output image to merge, and the relative light and shade relationship changes. In order to suppress the nonlinear distortion of the printer, researchers at home and abroad have established a printer model by simulating the characteristics of the printer's printing points and the printing mechanism of the printer. [0003] The current printer model usually converts the measured value into a density value or reflectance, and dete...

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
IPC IPC(8): H04N1/405H04N1/52H04N1/58
Inventor 易尧华苏海袁媛刘菊华苗敏婧陈聪梅杨慧芳陈亮周罗岚申春辉
Owner WUHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap