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Image color quantization and dithering method and system

A color quantization and color technology, applied in the field of image processing, can solve problems such as inconsistency in optimization goals, image quality effects need to be improved, etc., and achieve high image quality effects

Active Publication Date: 2020-09-25
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In traditional technology, quantization and dithering are two separate processes, the optimization goals are inconsistent, and the result is not optimal. Therefore, the image quality effect obtained after color quantization and dithering still needs to be improved

Method used

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  • Image color quantization and dithering method and system
  • Image color quantization and dithering method and system
  • Image color quantization and dithering method and system

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0029] Such as figure 1 As shown, in one embodiment, a method for image color quantization and dithering is provided, which can be applied to various electronic devices, especially display devices and printing devices that only support a small number of colors, and can implement the input image Express 24-bit true-color images (more than 16 million colors) with a small number of colors (such as 256 colors or less), while maintaining similarity to the original true-color images. The method includes:

[0030] Step 102, calculating the input image to obtain a visual saliency map.

[0031] A visual...

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Abstract

The invention relates to a method for image color quantification and dithering. The method includes: calculating an input image to obtain a visual saliency map; constructing an objective function based on the visual saliency parameters of pixels in the visual saliency map; The input image is subjected to alternating median segmentation and clustering algorithms to obtain the initial color panel; by optimizing the objective function to alternately update the pixel label map and color panel, the final pixel label map and color panel are obtained. Using this method, the image quality after color quantization can be improved. In addition, a system for image color quantization and dithering is also provided.

Description

technical field [0001] The invention relates to image processing technology, in particular to an image color quantization and dithering method and system. Background technique [0002] Color quantization is a technology capable of expressing 24-bit true-color images (more than 16 million colors) with a small number of colors (eg, 256 colors or less) while maintaining similarity to original true-color images. Color quantization ultimately needs to obtain color plates and pixel marker maps. Wherein, the color board includes K colors in the final image, and the pixel marker map indicates which color in the color board is selected for each pixel. Color quantization technology is widely used in display devices and printing devices that only support a small number of colors, and it is also a common preprocessing step for other image processing technologies. [0003] Traditional color quantization methods are based on clustering, which often introduce obvious false edges, such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/40
CPCG06T2207/20112G06T5/73
Inventor 徐昆黄飞跃王巨宏管刚黄浩智胡事民
Owner TSINGHUA UNIV