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Digital halftoning with clustered microdots

A halftone and tone technology, which is applied in the field of digital halftone processing, can solve problems such as inability to implement a wide range of installation bases, complexity, etc.

Pending Publication Date: 2021-03-19
YIKEFA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method involves complex mathematics and therefore cannot be implemented in a broad installed base of prepress systems with limited data storage and / or processing capabilities

Method used

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  • Digital halftoning with clustered microdots
  • Digital halftoning with clustered microdots
  • Digital halftoning with clustered microdots

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0022] raster image

[0023] The raster image produced in the method of the invention is suitable for rendering a continuous tone image (CT), ie it creates the illusion of a continuous tone image (CT) on a printed copy. This requirement implies that the screen frequency (i.e. the number of halftone elements placed next to each other per length unit in the direction producing the maximum value) is above 40 lines per inch (LPI; 15.7 lines / cm), more preferably 60 LPI (23.6 lines / cm) or more, most preferably 100 LPI (39.4 lines / cm) or more. If the screen frequency is below 40 LPI, halftone dots become visible at a viewing distance (approximately 20 cm) also known as the read distance. Such low screen frequencies are commonly used in artistic screening, which is used for decorative purposes, such as patterned illustrations, where it is desired that the individual dots be visible to the naked eye. Therefore, raster images in which halftone dots are clearly visible at viewing dis...

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PUM

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Abstract

A method of reproducing a continuous-tone image with a printing press comprises the step of making a printing plate having a halftone raster image comprising regularly tiled halftone cells which consist of a grid of image pixels and non-image pixels; the halftone cells are obtained by digital halftoning with a single threshold array and at least a portion of the halftone cells in the raster imagecomprise multiple image clusters, image clusters being defined as mutually separated groups of more than 4 adjacent image pixels; the image clusters allow to obtain a printed image of the same image density with less ink than with conventional screens wherein the image pixels are grouped into a single cluster.

Description

technical field [0001] The invention relates to the field of digital halftoning methods for printing images, in particular by lithographic or flexographic printing presses. Background technique [0002] Printing presses and digital presses cannot vary the amount of ink or toner applied to specific image areas except through digital halftoning, also known as dithering or screening. Binary digital halftoning is the process of rendering the artifacts of a continuous tone image by means of a halftone raster image (also known as a "screen") consisting of either "on" (image pixels) It consists of pixels (also known as "microdots") that are either "off" (non-image pixels), ie, which correspond to the image and background regions of the image, respectively. [0003] These pixels are usually arranged as a grid in so-called halftone cells. The ratio of image pixels to non-image pixels in a halftone cell defines the relative image density and dot percentage of the halftone cell. A h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/405B41M1/04B41M1/06
CPCB41M1/04B41M1/06H04N1/4055B41C2210/08B41C1/10B41N1/00G06K15/1836G06K15/1881B41F33/0072B41M1/14
Inventor R·巴特尔斯
Owner YIKEFA CO LTD
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