Threshold value matrix creating method, image output system, storage medium, gradation reproducing method, threshold value matrix, image processing method, image processing apparatus, image forming ap

A technology of threshold value matrix and generation method, applied in the fields of threshold value matrix generation, image output system, storage medium, grayscale reproduction, threshold value matrix, image processing, image processing device, image forming device and printer driver, which can solve the problem of difficult structure Problems such as image forming device and calculation processing load are heavy

Inactive Publication Date: 2004-12-22
RICOH KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But when the matrix becomes too large, it is difficult to construct an image forming device using a dithering method that allows high-speed processing
The computational processing load required to generate the mask becomes especially large

Method used

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  • Threshold value matrix creating method, image output system, storage medium, gradation reproducing method, threshold value matrix, image processing method, image processing apparatus, image forming ap
  • Threshold value matrix creating method, image output system, storage medium, gradation reproducing method, threshold value matrix, image processing method, image processing apparatus, image forming ap
  • Threshold value matrix creating method, image output system, storage medium, gradation reproducing method, threshold value matrix, image processing method, image processing apparatus, image forming ap

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Embodiment Construction

[0096] FIG. 2 is a flowchart generally illustrating an embodiment of a method for generating a threshold matrix according to the present invention. FIG. 3 illustrates the threshold matrix generated by this embodiment and its basic layout.

[0097] In FIG. 2 , steps S1 to S5 perform a process of generating the basic layout 1 shown in FIG. 3 . In addition, steps S6 and S7 perform processing of generating threshold value matrices 2 , 3 , and 4 shown in FIG. 3 based on the common basic layout 1 . These processes can be realized by software using a general-purpose computer having a known structure. The present invention also includes a program for causing a computer to perform these processes and a computer-readable storage medium storing the program.

[0098] In Figure 3, matrix 2 is for small dots, among them, hue 0.4 is for 100% small dots without segmentation image, hue 1.4 is for 100% maximum size dots without segmentation image, the grayscale value assigned to small dots is...

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Abstract

A threshold matrix creating method creates threshold value matrixes for quantizing multi-level image data into three or more valued data in order to represent halftone by ON and OFF states of a plurality of kinds of dots. The method includes a first stage which determines a threshold value layout order of the threshold value matrixes for binarizing the multi-level image data in order to represent the halftone by ON and OFF states of one kind of dot, and a second stage which creates each of threshold value matrixes for quantizing the multi-level image data into three or more valued data, according to the threshold value layout order determined by the first stage.

Description

technical field [0001] The present invention generally relates to a threshold value matrix generation method, an image output system, a storage medium, a gradation reproduction method, a threshold value matrix, an image processing method, an image processing device, an image forming device, and a printer driver, and particularly relates Size, different hue or brightness, or the ON and OFF states of dots of different sizes and hue or brightness to display halftones, while quantizing multilevel (or multivalued) image data into three or more values Threshold matrix for the data. Background technique [0002] Methods of generating halftone images through digital image processing can generally be classified into two categories, namely, dither methods and error diffusion (or dispersion) methods. The dithering method requires relatively little computational processing and enables high-speed processing. Therefore, the dithering method is suitable for situations where the image qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/40H04N1/405
CPCH04N1/4058H04N1/4051H04N1/4057H04N1/40087
Inventor 平野政德吉田雅一
Owner RICOH KK
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