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Low-contrast character image enhancement method

A character image, low-contrast technology, applied in the field of low-contrast character image enhancement, low-contrast character image enhancement based on wavelet transform, to achieve the effect of improving contrast

Pending Publication Date: 2021-08-13
SHIJIAZHUANG VOCATIONAL TECH INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is an enhancement method proposed f

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  • Low-contrast character image enhancement method

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Embodiment Construction

[0017] combined with Figure 1-3 The specific operation of the present invention will be described.

[0018] The invention is an enhancement method proposed for low-contrast character images in complex lighting environments. The idea of ​​the character image enhancement method is to obtain each component of the image through wavelet decomposition, use Gamma correction to adjust the contrast between the character and the background for the low-frequency component, and use the median filter to remove the existing salt and pepper noise for the high-frequency component. A new image is obtained through image reconstruction, and the image is subjected to secondary median filtering to obtain an enhanced character image.

[0019] A kind of low-contrast character image enhancement method of the present invention comprises the following steps:

[0020] (1) Character image wavelet decomposition;

[0021] (2) Gamma correction of the low-frequency component of the character image;

[0...

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Abstract

The invention discloses a low-contrast character image enhancement method, which is used for realizing low-contrast character image enhancement and comprises the following steps: 1, carrying out wavelet decomposition on a character image; 2, performing Gamma correction on a low-frequency component of the character image; 3, filtering the high-frequency component median of the character image; 4, reconstructing each component image of the character image; and 5, carrying out secondary median filtering on the reconstructed character image. According to the method, the image is decomposed into a high-frequency part containing noise and a low-frequency part containing main information through wavelet transform, the contrast ratio of the low-frequency part is improved through Gamma correction, salt and pepper noise existing in the high-frequency part is filtered out through median filtering, all components are subjected to wavelet reconstruction, and a new image is obtained; the enhancement of the low-contrast character image is completed through secondary median filtering, so that the contrast of the characters and the background in the low-contrast character image and the overall display effect of the image are effectively improved.

Description

technical field [0001] The invention relates to a low-contrast character image enhancement method, in particular to a wavelet transform-based low-contrast character image enhancement method, which belongs to the field of image enhancement. Background technique [0002] Information acquisition through images is more and more widely used in various industries, but the quality of the obtained original images is often uneven, and it needs to be processed to accurately extract information from them. The original images collected at industrial sites often have low contrast, and it is necessary to enhance the collected original images to improve the visual effect of the images so as to obtain key information from the images. [0003] Special steel bars are indispensable materials for construction, machinery, automobiles and other industries. my country, as the largest country in steel production, has an annual output of special steel bars of more than 15 million tons. There are va...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/009G06T5/006G06T5/001G06T2207/20032G06T2207/20064G06T2207/20172
Inventor 张诺谭寒冰马宝秋袁保立
Owner SHIJIAZHUANG VOCATIONAL TECH INST
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