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Halftone dot encoding

A halftone dot and encoding technology, applied in the field of image processing, can solve problems such as undesired binary patterns and reduced image quality

Inactive Publication Date: 2005-03-30
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the required binary resolution conversion step (combined with optional binary rotation) can lead to the creation of undesired (stress-laden) binary patterns, which significantly degrade picture quality

Method used

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Embodiment Construction

[0021] Disclosed is a method in an embodiment of halftone dot coding for engine dependent rendering. The method of the embodiments optimizes the asymmetric halftone dots by encoding the asymmetric halftone dots into a symmetrical resolution format; Binary resolution conversion algorithm to decode.

[0022] figure 1 The method for encoding halftone dots is described in , where a two-stage process is designed and implemented respectively. In the design phase 18, the halftone dot design 20 and dot encoding algorithm 24 are developed offline for a given printing press. The halftone dot design 20 is adapted to the characteristics of the (asymmetric) raster output scanner (ROS) electronics and marking engine. Next, these points are encoded 24 into Postscript TM Compatible symmetric formats. In the implementation part 26 of the method, the coded points are loaded into a digital front end (DFE). When the file is reproduced, the resulting binary 28 appears to encode a pattern of ...

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Abstract

There is disclosed in embodiments methods for halftone dot encoding for engine-dependent-rendering. The methods first carefully design an asymmetric halftone dot for a specific printer and then utilizes a halftone dot encoding algorithm, which encodes the asymmetric halftone dot into a symmetric format. The asymmetric halftone dot design is satisfies the requirements of raster output scanner electronics, as well as several engine dependent constraints. These include: rotation insensitivity, minimum dot size, minimum hole size, minimum appendage, and minimum cavity. The symmetric dot encoding allows perfect reconstruction of the binaries that may have been generated using the original asymmetric dot. This reconstruction is achieved using imbedded binary resolution conversion. In this way, this resolution conversion is acting as a decoder.

Description

technical field [0001] The invention, in embodiments, generally relates to image processing techniques. "In an embodiment" will be described in terms of electrophotographic applications such as xerographic imaging. However, the invention is applicable to other fields such as video image processing and lithography systems. Background technique [0002] In electronic imaging systems, an image, such as a page of a document, is described in a high-level image or page description language (PDL). Postscript TM is such a page description language well known in the art. To render an image, an image processor generates a binary image from a page description language description of the image. Binary images or bitmaps are in the form of marked / unmarked meshes or rasters. Producing a binary image from its page description language form is called raster image processing (RIP). In electrophotographic systems, a raster output scanner (ROS) controls the marking engine to determine the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00H04N1/387H04N1/405
CPCH04N1/4056H04N1/3877
Inventor D·J·利伯曼
Owner XEROX CORP
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