Character recognition method
A character recognition and character technology, which is applied in the field of optical character recognition, can solve problems such as unfavorable distinction and system recognition rate decline, and achieve the effect of improving character recognition rate, overcoming high similarity of features, and ensuring globalization
Active Publication Date: 2013-04-17
GRG BAKING EQUIP CO LTD
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For example, (x, y, f(x, y)) is used as the feature of a point P on the edge or skeleton, where x, y represent the coordinates of point P, and f(x, y) represents the brightness value, so the extracted features have Locality, if two characters have similar local shapes (such as Q and O), then the features extracted from the two characters have a great similarity, which is not conducive to distinguishing the two characters, resulting in a decline in the system recognition rate
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0028] combine figure 1 and figure 2 , this embodiment takes the recognition of two partially similar characters of B and P as an example to illustrate the character recognition method proposed by the present invention. The character recognition method includes:
[0029] Step 1: read in the character image; such as the banknote serial number area image;
[0030] Step 2: Image preprocessing, including three parts: image denoising, image rotation correction, image...
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The invention relates to a character recognition method, which comprises the following steps of: 1, read-in of a character image; 2, image preprocessing; 3, character cutting, 4, edge extraction, namely detecting edge points of each character by applying an edge detection operator; 5, characteristic extraction, namely expressing the characteristic of each edge point of each character by using a distance between the edge point and each of other edge points of the character and indicating the characteristics of the characters as characteristic vectors (P1k, P2k ellipsis PMk); 6, characteristic processing, namely mapping the characteristic vectors (P1k, P2k ellipsis PMk) into a matrix T, so that the characteristic vectors of all the characters are equal in dimensionality; and 7, template matching and recognition. Because the characteristic of each edge point of each character is expressed by using the distance between the edge point and each of other edge points of the character, the globality of the characteristics is ensured in terms of the whole character, the difference among characteristics of different characters is enlarged, and therefore the character recognition rate is increased.
Description
technical field [0001] The invention belongs to the field of optical character recognition and relates to an optical character recognition method. Background technique [0002] Character feature extraction is a crucial step in the character recognition process. Feature extraction can be regarded as the extraction of the key information of the original characters, so the features should reflect the differences between different characters as much as possible. In other words, the distance between the features of different types of characters should be as large as possible. If the features are not selected properly, no matter what kind of classifier is selected, it will not be able to achieve a good recognition rate. [0003] Recognizing a character usually extracts the edge of the character or extracts the skeleton of the character, and then extracts features on the edge or skeleton. Existing methods only consider the information of the current point itself when describing t...
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IPC IPC(8): G06K9/00G06K9/60G06V30/182G06V30/10
CPCG06T7/12G06T7/13G06V30/10G06V30/182G06T5/70
Inventor 梁添才王锟王卫锋刘思伟
Owner GRG BAKING EQUIP CO LTD