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Scanned document image error correction method

A document image and document technology, applied in the field of inclination detection and correction, can solve the problems of difficulty in obtaining accurate angles, high computational complexity and low efficiency, and achieve the effect of satisfying real-time processing.

Inactive Publication Date: 2016-11-09
TIANJIN UNIV
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Problems solved by technology

This method has strong anti-interference ability, but the disadvantage is high computational complexity and low efficiency
In addition, if there are multiple writing directions such as horizontal, vertical, and oblique in the text (such as handwritten documents), it is difficult to obtain an accurate angle using this method

Method used

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  • Scanned document image error correction method
  • Scanned document image error correction method
  • Scanned document image error correction method

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Embodiment Construction

[0044] The method for rectifying the scanned document image in the present invention mainly includes three main steps: preprocessing, tilt angle detection and correction, text area centering and other main steps. figure 1 Shown is the flowchart of the proposed method. The following describes the detailed implementation process of each step:

[0045] 1. Grayscale color image

[0046] First judge the type of the scanned document image input, if the scanned document image input is a color image, first convert it to a grayscale image.

[0047] Use C to represent the input color scanned document image, and its red, green, and blue three-channel images are respectively represented by C R 、C G and C B express. Then the grayscale image corresponding to C (represented by I) is the minimum value of the three color sub-channel images, that is,

[0048] I(x,y)=min(C R (x,y),C G (x,y),C B (x,y)) (1)

[0049] 2. Smoothing filter

[0050] Documents may introduce noise during scann...

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Abstract

The invention relates to a scanned document image error correction method. The method comprises the following steps: converting into a gray-scale image; performing filtering; extracting an edge-point binary map; by means of projection analysis, scanning an inclination angle of a scanned document image; and according to Q, calculating boundary of a text area, accordingly, calculating an offset amount, and by means of translation operation, enabling the text area to be centered. According to the invention, through detecting inclination of the input scanned document image, inclination of an original document image is rectified, and a document image with better visual quality can be obtained.

Description

technical field [0001] The invention relates to scanning document image processing technology, in particular to scanning document image tilt detection and correction technology. Background technique [0002] Document images scanned by scanners often have a certain angle of inclination. The cause of the skew is mainly determined by the way the scanner feeds the paper. There are two common feeding methods: manual feeding and automatic feeding. Manual feeding means that the user holds the paper directly from the scanner's paper inlet, and manually adjusts the position of the paper. When scanning, the paper does not move, and the scanning head moves. This can ensure that the image does not tilt when scanning the document, and the scanning result is not obvious. deviation. However, manual feeding can only scan one original at a time, which is very inefficient. Automatic paper feeding refers to feeding paper to the scanning machine through a certain automatic mechanical device...

Claims

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Application Information

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IPC IPC(8): G06T3/60G06T5/00
CPCG06T3/608G06T2207/10008G06T2207/20032G06T5/70
Inventor 王建
Owner TIANJIN UNIV
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