Double-feedback error diffusion based frequency-modulation screening method

一种误差扩散、双反馈的技术，应用在图像通信、电气元件等方向，能够解决网点层次易丢失、降低纹理等问题，达到解决容易丢失、降低纹理的效果

Inactive Publication Date: 2005-09-14
BEIJING FOUNDER ELECTRONICS CO LTD +1
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Problems solved by technology

This method can effectively solve the problem that the dot level is easily lost when the resolution of the output device is low, and at the same time reduce the texture caused by the random distribution characteristics, so it can output a high-quality halftone image with full layers

Method used

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  • Double-feedback error diffusion based frequency-modulation screening method
  • Double-feedback error diffusion based frequency-modulation screening method
  • Double-feedback error diffusion based frequency-modulation screening method

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0037] In order to achieve the above purpose, the present invention is based on the original error diffusion frequency modulation hanging network method, and adopts a double feedback mechanism. The specific implementation scheme includes the following steps:

[0038] Such as figure 1 As shown, in the method described in the present invention, diffusion in multiple directions is used.

[0039] (1) First scan and input the original image, and perform threshold value comparison operation T on the final input pixel g″(m, n) of the original image after preliminary processing, and the result of the operation is converted into the corresponding pixel b(m, n) of the halftone image n);

[0040] When scanning the original pixel data here, in order to avoid the interference phenomenon caused by the scanning direction and the randomly distributed dot frequency, which i...

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Abstract

This invention relates to an error diffusion FM latticing method based on double feedback, which applies a double feedback technology based on the basic algorithm of error diffusion to combine the traditional FM lattice with the AM lattice to reach the effect of mixed doubling the lattice. This method can solve the problem of loosing lattice point hierarchies when the resolution of an output device is rather low and reduce veins brought with the random distribution property at the same time so as the output high quality semi-color tone images with saturated hierarchies.

Description

technical field [0001] The invention belongs to a method for generating halftone dots in the field of image hard copy reproduction, and in particular relates to an error diffusion frequency modulation hanging network method based on double feedback. Background technique [0002] The hard copy reproduction of images mainly involves the hanging net plate-making technology of printers and high-end printing plate-making equipment. The hanging network technology used for image hard copy reproduction is also called digital image halftone technology. Digital image halftone technology can be divided into two categories, namely amplitude modulation hanging network and frequency modulation hanging network. The amplitude modulation hanging net is also known as the gathering point orderly dithering technology, which is characterized in that the dyeing points of the generated halftone image are aggregated in pairs adjacent to each other in geometric positions, thus forming clusters of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/40H04N1/405
CPCH04N1/4055H04N1/4052
Inventor 李海峰杨斌马世雄
Owner BEIJING FOUNDER ELECTRONICS CO LTD
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