Method for evaluating quality of printer image halftone outputting algorithm

A technology for quality evaluation and print output, applied in image communication, electrical components, etc., to solve the problem of inability to output halftone results, such as linearity evaluation

Inactive Publication Date: 2014-02-19
WUHAN UNIV
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Problems solved by technology

However, after the halftone result is printed out, none of these digital image eva

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  • Method for evaluating quality of printer image halftone outputting algorithm
  • Method for evaluating quality of printer image halftone outputting algorithm
  • Method for evaluating quality of printer image halftone outputting algorithm

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Embodiment Construction

[0026] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0027] The present invention will be further described below by taking the halftone method to be evaluated as green noise halftone method with hysteresis coefficients of 1.5 and 3.0 respectively, the printer as Pantum2000 laser printer, and the measuring device as Eyeone colorimeter.

[0028] please see figure 1 , the technical scheme adopted in the present invention is: a kind of printer image halftone output algorithm quality evaluation method, it is characterized in that, comprises the following steps:

[0029] Step 1: See figure 2 , this embodiment first designs 20 gray color blocks, wherein, for the gray color blocks, 0 is used to represent black, and 1 is used to represent white, and the gray value increases from 0 to 0.95 with 0.05 as the growth step , paper white is 1.

[0030] Step 2: use the green noise halftone method with a hys...

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Abstract

The invention discloses a method for evaluating the quality of a printer image halftone outputting algorithm. The method comprises the steps of converting an output halftone image measurement value into a Munsell lightness value, performing linear fitting on the Munsell lightness value and a corresponding gray value, using four indexes including error term quadratic sum, root-mean-square errors, regression coefficient and adjusted regression coefficient to perform unitary linear recursive analysis, and accordingly analyzing the robustness of a halftone algorithm to the laser printer non-linear characteristic. By adopting the method, the purpose of evaluating the robustness of the halftone algorithm to the laser printer non-linear characteristic is achieved, and a basis is provided for further modification of the halftone algorithm and establishment of a printer model.

Description

technical field [0001] The invention belongs to the field of digital image processing, and relates to a method for checking output halftone results, in particular to a method for evaluating the quality of a printer image halftone output algorithm. Background technique [0002] Due to the nonlinear characteristics of the printer, when the halftone result obtained by the halftone algorithm is output, the output halftone result generally has a non-linear reproduction of the tone. Therefore, the halftone algorithm should be robust to the nonlinear characteristics of the printer. In order to evaluate the robustness of the halftone algorithm to laser printers, it is necessary to evaluate the linearity of the halftone results output by the printer, so as to provide a basis for further modification of the halftone algorithm and establishment of a printer model. [0003] The current halftone algorithm evaluation methods usually only use digital image evaluation methods such as mean ...

Claims

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Application Information

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IPC IPC(8): H04N1/405
Inventor 易尧华苏海袁媛刘菊华陈聪梅杨慧芳陈亮周罗岚申春辉丰立昱
Owner WUHAN UNIV
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