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A method of digital halftoning

A halftone and tone technology, applied in the field of digital halftone of printed images, which can solve the problems of poor smoothness of flat tones, high dot gain, high plate wear, etc.

Pending Publication Date: 2022-02-08
易客发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these techniques are also characterized by other issues such as print stability, poor smoothness of flat tones, high dot gain over long print runs and high plate wear

Method used

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  • A method of digital halftoning
  • A method of digital halftoning
  • A method of digital halftoning

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Embodiment Construction

[0017] The present invention is a method for digitally halftoning a continuous tone image into a halftone raster image having halftone cells, wherein each halftone cell has a shape; wherein the method comprises: utilizing a threshold array in said halftone The step of generating halftone dots in a cell, the thresholding array is used to determine non-image pixels and image pixels in the halftone cell, and wherein the non-image pixels represent a first closed contour (200) and the image pixels represent a first closed contour (200) Two closed contours (100); and wherein said first closed contour (200) and / or second closed contour (100) has a deformed shape from the shape of said halftone cell. The shape is preferably not a regular polygon. The shape preferably has one or more sides that are not straight (=it does not represent a line). The closed contour is sometimes referred to as a 'profile'.

[0018] In the highlights of a halftone raster image, the halftone dots from this...

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Abstract

A method of digital halftoning a continuous tone image into a halftone raster image having halftone cells wherein each halftone cell has a shape; wherein the method comprises the step generating a halftone dot in said halftone cell with a threshold array for determining non-image pixels and image pixels in said halftone cell and wherein said non-image pixels represent a first closed contour and image pixels represent a second closed contour; wherein said first closed contour and / or second closed contour has a morphologic image processed shape from the shape of said halftone cell and wherein the halftone cells are arranged according to a periodic tessellation using a tile wherein each halftone cell has one or more edges which is not straight.

Description

technical field [0001] The present invention relates to the field of digital halftoning methods for printing images, in particular by means of lithographic or flexographic printing machines. Background technique [0002] Presses and digital printers 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 illusion of a continuous tone image with the aid of a halftone raster image (also called a "screen") made up of pixels (also called "micro-dots") that Either "on" (image pixels) or "off" (non-image pixels), which correspond to image and background regions of the image, respectively. [0003] These pixels are usually arranged in 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 of the halftone cell, also known as dot percentage. A halftone cell ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/405
CPCH04N1/4055H04N1/4092
Inventor R·巴尔特斯
Owner 易客发有限公司