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Multiple-order half-tone image forming method and device from input digital image

A digital video, halftone technique used in the field of video colorization systems

Inactive Publication Date: 2004-08-25
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The aforementioned conventional techniques are mainly used for coloring of one-bit image representation, Figure 7 It is its actual grayscale image (grayscale values ​​from top to bottom are 255, 224, 192, 160, 128, 96, 64, 32, 0), and if it is to be applied to form a multi-level (Mulii-level) When halftone images are used, the number of bits representing image pixels must be expanded. In known technologies, such as "Method for printing N-tone images with multi-level technology" in US5689586, "Multiple-level technology" in US5416481 The analog-to-digital converter with step halftone current input" and the "method and system for forming a multi-step halftone image from an input digital image" of US5905490 have disclosed the technology on how to form a multi-step halftone image. Both are extended based on a one-bit sequential mixing algorithm, so they are still not immune to the problem of visually detectable halftone patterns

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  • Multiple-order half-tone image forming method and device from input digital image

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Embodiment Construction

[0024] For a preferred embodiment of the method and device for forming a multi-level halftone image from an input digital image of the present invention, please refer to figure 1 As shown, it is the pixel value I of the input digital image 11 at the point of coordinates (x, y) xy With a plurality of thresholds Th of a multiple threshold device 13 i (1≤i≤N) compared to convert the pixel value B that forms the multi-level halftone image xy , and the pixel value I of the input digital image xy and corresponding to the pixel value B of the halftone image xy Subtract to obtain a difference e xy ,that is:

[0025] e xy =I xy -B xy . (1)

[0026] The difference e xy are called errors, and these represent the difference between past errors e xy And input an error filter (Error Filter) 12 to carry out Σ ( k , l ) h kl ...

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Abstract

The half-tone image forming method includes calculating the pixel value difference between the input digital image and the corresponding half-tone image, processing in an error filter to correct the pixel value of the input digital image, comparing the corrected value to at least two critical values corresponding to the pixel value of a half-tone image separately, determining the nearest clinical value and obtaining the pixel value of the half-tone image corresponding to the nearest clinical value. Thus, all the pixels in the input digital image are converted to pixels in half-tone image and high quality half-tone image is obtained simply.

Description

technical field [0001] The present invention relates to the technical field of image coloring systems, especially a method and device for forming multi-level halftone images from input digital images. Background technique [0002] Halftone (Halftone) method is a step often used in printing photos. Its purpose is to convert grayscale images into binary (Binary) images, that is, each pixel (Pixel) of the image is represented by a bit (Bit). represent, for example in Image 6 In the general image coloring system shown, a continuous-tone digital image (Continuous-tone Digital Image) is processed by a display preprocessor 61 (Display Preprocessor) to convert it into a binary discrete space image (Binary Discrete -space Image)b[x, y], this binary discrete spatial image can be used as the input of the physical reconstruction function (Physical Reconstruction Function) provided by binary display devices (Binary Display Device) such as liquid crystal displays or printers. Generate a...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 陈立明
Owner SUNPLUS TECH CO LTD