Method for automatically registering scanned document images

A document image, automatic registration technology, applied in image analysis, image data processing, instruments, etc., can solve the problems of complex algorithm complexity, insufficient use of scanned document images, speed can not meet the requirements of applications, etc., to achieve reproduction High rate, improve the effect of automatic processing efficiency

Inactive Publication Date: 2010-10-27
INST OF AUTOMATION CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The various methods proposed above are very complicated in terms of algorithm complexity, such as Hough transform, Fourier-Mellin transform, etc., which require image transformation, increase calculation consumption, cannot meet the application requirements in terms of speed, and do not make full use of scanned document i

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  • Method for automatically registering scanned document images
  • Method for automatically registering scanned document images
  • Method for automatically registering scanned document images

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Embodiment Construction

[0050] Various details involved in the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention, rather than limiting it in any way.

[0051] We apply the method of the present invention to the automatic registration system for filling and painting cards. The algorithm is developed under the computer Windows XP 2002 system, combined with C language and matlab development environment. The following describes the implementation process of document image automatic registration, the experimental data is the filling card image obtained by the scanner, and the resolution of the scanner is 200dpi.

[0052] by Figure 4 , Figure 5 For example, Figure 4 scan document images as standard, Figure 5 is the scanned document image to be matched, Figure 5 yes Figure 4 In the filled scan...

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Abstract

The invention discloses a method for automatically registering scanned document images, which comprises the following five steps: detection by using improved characteristic points, the coarse estimation of a rotation parameter, the coarse matching of characteristic points, the elimination of the erroneous matching characteristic points, and precise matching. Concretely, the five steps comprise: detecting the characteristic points of a standard scanned document image and a scanned document image to be matched by using the improved characteristic-point detection algorithm; estimating the primary rotation angle of the scanned document image to be matched relative to the standard scanned document image according to the positions of the characteristic points; calculating matched characteristic point pairs of the characteristic points in the standard scanned document image and the scanned document image subjected to primary rotation by using a normalized correlation algorithm; eliminating the erroneous matching by using an improved random sample consensus robust algorithm; and calculating the matching parameter between the standard scanned document image and the coarsely-rotated scanned document image to be matched according to the positions of the precise matching point pairs searched from an eight neighborhood, and making the parameter act on the coarsely-rotated scanned document image to be matched so as to obtain the registered image.

Description

technical field [0001] The invention belongs to the technical field of pattern recognition and information processing, relates to the processing of scanned images, and in particular provides a specific implementation scheme for automatic registration of scanned document images. Background technique [0002] Image matching refers to analyzing the characteristics of the overlapping parts of two images, and aligning the two images obtained under different circumstances. Usually, there are scale, rotation, and translation transformations between the two images. The matching process is to obtain parameters for these transformations. In people's daily work and life, scanners help people easily obtain images of documents. In most cases, it is necessary to realize automatic processing of documents, such as image segmentation, text extraction and recognition, etc., but the working process of scanners Rotation and translation (scales are negligible) are inevitably introduced in , whi...

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Application Information

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IPC IPC(8): G06T7/00G06K9/46
Inventor 马龙肖柏华王春恒李敏华
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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