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Text Image Enhancement Method and System Based on Stroke Operator

A text image and enhancement system technology, applied in the field of image processing, can solve the problems of affecting the visual effect of the image, increasing the background noise, and large image compression rate, and achieving the effect of enhancing the reading effect, simple technical implementation, and small amount of calculation.

Active Publication Date: 2011-12-07
SHANGHAI ZHANGMEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a handheld reader, limited by the screen resolution, the compression rate of the image will be greater, the strokes will be partially weakened, and the background noise will be more obvious, which will seriously affect the visual effect of the image.

Method used

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  • Text Image Enhancement Method and System Based on Stroke Operator
  • Text Image Enhancement Method and System Based on Stroke Operator
  • Text Image Enhancement Method and System Based on Stroke Operator

Examples

Experimental program
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Embodiment 1

[0039] Such as figure 1 As shown, the present embodiment provides a text image enhancement method based on a stroke operator, comprising the following steps:

[0040] Step 1: Use the stroke operator to perform stroke detection on the image to be processed to form a stroke feature map, and binarize the stroke feature map to obtain a binary stroke map;

[0041] Step 2: Enhancing corresponding stroke points in the image to be processed according to the stroke point information of the binary stroke map to obtain a stroke enhancement map;

[0042] Step 3: performing an expansion operation on the binary stroke image to generate a stroke mask image;

[0043] Step 4: Using the stroke mask map to protect the thin stroke area in the stroke enhancement map, and denoise the remaining parts.

[0044] It should be noted that Step 2 and Step 3 are parallel operations, and there is no sequence of execution.

[0045] Attached below Figures 1 to 5 Steps 1 to 4 of this embodiment are descri...

Embodiment 2

[0071] Such as Figure 6 As shown, the present embodiment provides a text image enhancement system based on stroke operators, including:

[0072] The image binarization unit 11 is used to use the stroke operator to perform stroke detection on the image to be processed to form a stroke feature map, and binarize the stroke feature map to obtain a binary stroke map;

[0073] The stroke enhancement unit 12 is configured to enhance the corresponding stroke points in the image to be processed according to the stroke point information of the binary stroke map to obtain a stroke enhancement map;

[0074] A stroke mask unit 13, configured to perform an expansion operation on the binary stroke map to generate a stroke mask map;

[0075] The background denoising unit 14 uses the stroke mask map to protect the fine stroke area in the stroke enhancement map, and performs denoising processing on the rest.

[0076] To sum up, the stroke operator-based text image enhancement system provided...

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Abstract

The invention provides a method and a system for enhancing a text image based on a stroke operator. The stroke operator is introduced into image enhancement processing, strokes and background can be intelligently distinguished through the stroke operator, the stroke is deepened, and the background is denoised, so that the aim of enhancing a reading effect can be effectively fulfilled; moreover, the stroke operator, binarization and expansion operation are adopted, so the calculation amount is small, the performance is good, and the real-time requirement can be met; moreover, the technology is easy to implement, technical barriers are avoided, the method and the system are low in cost and risk and have a wide application range, can be used for image enhancement in a handheld reader, and can also be used for the image preprocessing step for optical character recognition.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a text image enhancement method and system based on a stroke operator. Background technique [0002] Image enhancement refers to enhancing the useful information in the image, with the purpose of improving the visual effect of the image. Image enhancement can be divided into two categories: frequency domain methods and spatial domain methods. The frequency domain method regards the image as a two-dimensional signal, and performs signal enhancement based on two-dimensional Fourier transform. The frequency domain method includes low-pass filtering method and high-pass filtering method. The low-pass filtering method can remove the noise in the picture, and the high-pass filtering method can enhance high-frequency signals such as edges to make blurred pictures clear. However, both noise and text strokes are high-frequency signals, which are difficult to take into account, and the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 程豪
Owner SHANGHAI ZHANGMEN TECH
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