Method of generating threshold matrix and recording medium storing data of threshold matrix

A threshold matrix and recording medium technology, applied in the field of threshold matrix, can solve problems such as loss of regularity, and achieve the effect of suppressing ripples and particles

Active Publication Date: 2006-04-12
DAINIPPON SCREEN MTG CO LTD
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Problems solved by technology

Furthermore, in the technique of Document 2 in which a plurality of light-tone-side dot centers and a plurality of dark-tone-side dot centers are arranged, since the regularity of arranging a plurality of dark-tone-side dot centers around one light-side dot center is lost, So noticeable graininess appears in the resulting image

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  • Method of generating threshold matrix and recording medium storing data of threshold matrix
  • Method of generating threshold matrix and recording medium storing data of threshold matrix
  • Method of generating threshold matrix and recording medium storing data of threshold matrix

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Embodiment Construction

[0033] figure 1 is a view showing the structure of the image recording system 1 according to the preferred embodiment of the present invention. The image recording system 1 includes a computer 11 and an image recording device 12; the image recording device 12 receives a signal from the computer 11 and records halftone dots on a printing plate as a halftone dot recording medium using beams from multiple lasers or the like. The image recording device 12 may be another recording mode printing device such as an electrophotographic or inkjet printing device using a photosensitive drum or printing paper as a halftone halftone dot recording medium, respectively.

[0034] The computer 11 has a configuration of a general computer system in which a CPU 101 for performing various calculations, a ROM 102 for storing basic programs, and a RAM 103 for storing various information are connected to a bus. On the bus, also be connected suitably by interface (I / F): image memory 104, be used for...

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Abstract

The present invention provides method of generating threshold matrix and recording medium storing data of threshold matrix. In a matrix area (720), a plurality of highlight-side dot centers (731) and a plurality of shadow-side dot centers (741) are regularly arranged and a plurality of reference points (751) are set while being distributed almost uniformly. Each of the dot centers (731, 741) is rotated about a nearest reference point (751). Threshold values of the matrix area (720) are determined so that halftone dot areas should be changed around a plurality of highlight-side dot centers (731) after being rotated in accordance with the variation in gray level on the highlight side and a halftone dot area (i.e., joined dot areas) should be changed around a plurality of shadow-side dot centers after being rotated in accordance with the variation in gray level on the shadow side. In a halftone dot image generated by using the matrix area which is thus generated, it is possible to suppress moire and graininess.

Description

technical field [0001] The present invention relates to a threshold value matrix for generating a halftone dot image representing a grayscale raw image. Background technique [0002] In many cases, halftone dots are used to create printing plate data from grayscale (ie, continuous tone) raw image data. In commonly used AM (amplitude modulation) screening, the grayscale representation is performed by changing the size of the dots instead of changing the number of dots that make up the halftone dot image, but since the dots are regularly arranged, So when a periodic image is generated by using halftone dots, moiré appears in the generated halftone dot image. Then, people have proposed the technology that is used to reduce moiré effect, for example in U.S. Patent No.6,128,099 (document 1), a plurality of dot centers (dot centers) are randomly arranged; One highlight-side dot center and multiple shadow-side dot centers are randomly distributed. [0003] On the other hand, in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/405
CPCH04N1/4055
Inventor 浅井浩竹本康弘
Owner DAINIPPON SCREEN MTG CO LTD
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