Deflection correction method for paper outline

Abstract

The invention discloses a skew correction method for a paper contour. The skew correction method comprises the following steps: S1, acquiring a scanning image of paper; S2, performing graying processing on the scanned image to obtain a grayscale image; S3, performing binary conversion on the grayscale image to obtain a binary image; S4, performing contour extraction on the binary image to obtain acontour of the binary image; S5, calculating the minimum bounding rectangle of the extracted contour; S6, affine transformation is conducted on the scanned image according to the minimum enclosing rectangle, and the corrected image is obtained. The paper contour is positioned by using the minimum enclosing rectangle, the influence of some incomplete and special-shaped paper on paper contour positioning can be effectively avoided, affine transformation processing is used after contour extraction, deviation rectification and cutting can be performed on the scanned image at the same time, the image processing efficiency is improved, and the high-quality and corrected scanned image can be rapidly acquired.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a skew detection and deviation correction method for paper outlines. Background technique [0002] When scanning paper with a scanner, the outline of the paper is often skewed. With the continuous development of digital applications, images scanned by scanners are not only used for image data storage, but also for extended applications such as image information identification, extraction, and modification. A skewed paper image may adversely affect the accuracy and efficiency of the extended application, so we need to detect the skew of the scanned paper image and perform skew correction. [0003] In the traditional solution, relying on the mechanical structure to ensure the scanning angle of the paper, but can only solve the paper skew problem relatively roughly. For the paper skew caused by mechanical failure or higher-precision pixel-level skew correction, related sol...

AI Technical Summary

Problems solved by technology

[0003] In the traditional solution, relying on the mechanical structure to ensure the scanning angle of the paper, but can only solve the problem of paper skew relatively roughly. For mechanical failure paper skew or higher-precision pixel-level skew correction, related solutions cannot solve it well.

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