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A Flattening Method for Curved Writing Based on Datum Line

A baseline, written technology, applied in image data processing, instruments, calculations, etc., can solve problems such as troublesome image acquisition, and achieve the effects of simple operation, high speed, and simple deployment process.

Inactive Publication Date: 2017-07-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the surface flattening technologies that exist today require the combination of images from multiple angles of the curved surface to obtain the 3D information of the image and then flatten the image. Curved written correction has become the goal pursued by people

Method used

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  • A Flattening Method for Curved Writing Based on Datum Line
  • A Flattening Method for Curved Writing Based on Datum Line
  • A Flattening Method for Curved Writing Based on Datum Line

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Embodiment Construction

[0033] The present invention will be described below in conjunction with the accompanying drawings and embodiments.

[0034] In the present invention, the bounding box of each font on the curved writing is regarded as a parallelogram, and the upper and lower borders are parallel. Regardless of whether the writing is enlarged, reduced or bent, the midline of the upper and lower borders can be regarded as the midline of the text line. Therefore, the center line of the text line is used to locate the reference line. The positioned reference line divides the curved writing into several parts, and then flattens the curved writing in different regions, and finally realizes the flattening of the curved writing based on a single image, and has a good flattening effect. Specifically include the following steps:

[0035] 1) Acquisition of curved surface images, such as figure 1 shown.

[0036] 2) Perform grayscale transformation on the surface image and perform binarization. Then, a...

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PUM

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Abstract

The invention relates to a method for flattening curved writing based on reference lines, comprising: collecting curved surface images of curved writing; preprocessing the curved surface images to obtain connected areas of each text line; obtaining the reference line and reference line equation of each text line ;Detect the longest straight line among all the reference lines in curved writing; rotate the image clockwise by the corresponding angle, so that the direction of image flattening becomes horizontal, and obtain a new reference line equation; image flattening. The invention has the advantages of fast speed and good effect.

Description

[0001] Technical field [0002] The invention belongs to the technical field of digital image processing and relates to a method for flattening curved writing. Background technique [0003] With the continuous progress and development of modern technology and the widespread popularity of electronic products, more and more people choose to read and study on electronic platforms. However, there are only paper versions of a large number of documents, which requires a large number of paper documents to be digitized. Due to the portability and convenience of digital cameras, more and more people use digital cameras to collect images of documents. Due to the large thickness of some documents, they cannot be completely flattened, so most of the collected images will appear similar to the phenomenon that the middle of the cylinder is convex and the two sides are concave. Post-processing requires flattening curved written images for readability and recognition. Most of the surface f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/00
Inventor 肖夏田健飞
Owner TIANJIN UNIV