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Method and device for image transformation, method and device for image identification

A transforming device and image technology, applied in the field of image processing, can solve the problems of many candidate matching pairs, image recognition errors, and high text similarity, and achieve the effects of avoiding too many corners, accurate results, and small amount of calculation.

Active Publication Date: 2015-11-25
BEIJING KUANGSHI TECH +1
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Problems solved by technology

When the above image transformation method is applied to the printed document image, due to the large number of corner points and high similarity of the text, there are many candidate matching pairs, which significantly increases the amount of calculation and easily causes the transformation to fail.
[0006] The calculation amount of image transformation directly affects the calculation amount of image recognition, and if the image transformation fails, it is likely to cause errors in image recognition

Method used

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Embodiment Construction

[0032] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] Words are a system of symbols used by humans to communicate, and a written form of recording thoughts and events. Text is formed by simple graphics, which were closer to pictures in the early days and closer to geometric lines now. For example, the Latin alphabet is composed of simple lines, arcs and dots. Chinese characters are mainly composed of straight lines, so they are called "square Chinese characters". Images conta...

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Abstract

The invention discloses a method and a device for image transformation, and a method and a device for image identification. The method for image transformation comprises steps of performing character pre-identification on an image to be transformed which contain characters, generating candidate matching pairs between the image to be transformed and an template image based on the character pre-identification result of the image to be transformed and a text area of the template image, choosing a self-consistent candidate matching pair from the candidate matching pairs and generating a geometry transformation from the image to be transformed to the template image according to the self-consistent candidate matching pair, transforming the image to be transformed according to the geometry transformation, and enabling the size and direction of the characters in the image to be transformed to be identical to that of the template image. The method and the device for image transformation are small in calculation and high in accuracy. The method and the device for the image identification can obtain a good identification effect due to the fact that the character turns straight under the premise that the calculation amount is small.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image transformation method, an image recognition method and devices corresponding to the two. Background technique [0002] Image transformations are beneficial preprocessing steps for many image processing operations, such as image recognition operations. When the orientation of the image to be recognized is as figure 1 When the timing is not shown, the performance of the image recognition operation will inevitably decrease, or the image recognition algorithm will become complicated to increase the calculation time. Therefore, beneficially, before image recognition, the image to be recognized is first converted to figure 2 positive direction shown. Here, "positive" means correct and not crooked. [0003] Several methods exist to perform image transformation operations. [0004] In one class of methods, the image bounding box is known to be a rectangle. Image transforma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/20G06K9/00
CPCG06T3/20G06V30/40
Inventor 周舒畅姚聪巩运青
Owner BEIJING KUANGSHI TECH
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