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Threshold matrix generation method, threshold matrix generation apparatus, and recording medium

一种阈值矩阵、矩阵的技术，应用在阈值矩阵领域，能够解决网点图像出现粒状物等问题，达到适当平滑化操作的效果

Active Publication Date: 2006-07-12
DAINIPPON SCREEN MTG CO LTD
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Problems solved by technology

[0005] However, in the case of the methods of Documents 1 and 2, large clusters formed by connecting adjacent points and small clusters as a plurality of isolated points are irregularly mixed within the range of gray levels where point connection occurs, This can cause graininess in the resulting dot image

Method used

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  • Threshold matrix generation method, threshold matrix generation apparatus, and recording medium
  • Threshold matrix generation method, threshold matrix generation apparatus, and recording medium
  • Threshold matrix generation method, threshold matrix generation apparatus, and recording medium

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Embodiment Construction

[0031] figure 1 is a view showing the structure of the image recording system 1 according to the first preferred embodiment of the present invention. The image recording system 1 includes a computer 11 and an image recording device 12, and the image recording device 12 receives a signal from the computer 11 and records halftone dots on a printing plate serving as a halftone dot recording medium by using beams from multiple lasers or the like. The image recording device 12 may be a printing device of another recording mode such as an electrophotographic printing device using a photosensitive drum or printing paper as a dot recording medium, respectively, or an inkjet printer.

[0032] The computer 11 has a configuration of a general-purpose 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 all connected to a bus. Through the interface (I / F) as appropriate, the followin...

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Abstract

In a threshold matrix generation part implemented by a computer, a tint image in a specified gray level is generated from temporary lighting order set in a matrix area, and a smoothing operation is performed on the tint image, to generate a grayscale evaluation image. The lighting order is modified by changing ordinal numbers in the lighting order of respective positions included in specified areas in the matrix area which correspond to areas around boundaries of halftone dot areas in the tint image on the basis of values of corresponding pixels in the evaluation image. With this operation, when the smoothing operation is performed on a tint image in the specified gray level generated in accordance with a modified lighting order, a variation among values of pixels included in the specified areas becomes smaller than a variation among values of pixels included in the specified areas in a case where the smoothing operation is performed on the tint image in the specified gray level generated in accordance with an unmodified lighting order. Then, threshold values are determined in the matrix area with reflecting the modified lighting order, to generate the threshold matrix which is possible to suppress graininess in a generated halftone dot image.

Description

technical field [0001] The present invention relates to a threshold value matrix which is compared with the gray scale original image during the process of generating a dot image representing the gray scale original image. Background technique [0002] In many cases of making print data or printing plate data from grayscale images, a creation method of halftone dot images is used as a halftoning method. Known types of point shapes are square, chain, ellipse, circle, etc. In the general-purpose AM (Amplitude Modulation) halftone method, gray scale display is performed by changing the size of dots constituting a halftone image instead of changing the number of dots. However, since these points are regularly arranged, each point is connected to the adjacent point at the specified gray level (the gray level of the specified tone value) almost at the same time, and even if the change of the gray level is required to be continuous, the gray level Changes in degree levels also ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/405
CPCH04N1/4051H04N1/4055
Inventor 浅井浩中野雅之竹本康弘
Owner DAINIPPON SCREEN MTG CO LTD
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