Variable-length license plate character segmentation method based on hybrid tilt correction and projection method

A technology of tilt correction and character segmentation, applied in the field of computer vision, can solve the problem of difficulty in segmentation of license plate characters, and achieve the effect of weakening the adhesion between characters and background, optimizing the binarization result, and improving the accuracy.

Inactive Publication Date: 2017-03-22
HUNAN VISION SPLEND PHOTOELECTRIC TECH
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Problems solved by technology

These situations bring difficulties to license plate character segmentation

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  • Variable-length license plate character segmentation method based on hybrid tilt correction and projection method
  • Variable-length license plate character segmentation method based on hybrid tilt correction and projection method
  • Variable-length license plate character segmentation method based on hybrid tilt correction and projection method

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Embodiment Construction

[0048] Taking the license plate image as an example, the present invention will be further described in detail in conjunction with the accompanying drawings.

[0049] figure 1 It is the overall flowchart of the embodiment of the present invention.

[0050] This embodiment is a method for segmenting license plate characters of variable length based on hybrid tilt correction and projection method, which specifically includes the following steps:

[0051] Step S1 uses a fast and effective mixed tilt license plate correction method to perform horizontal and vertical tilt correction on the license plate;

[0052] The parking of the vehicle has a certain randomness, which causes a certain inclination in the captured license plate image, which will seriously affect the segmentation and recognition of characters. Only by comprehensively eliminating the horizontal and vertical inclinations can the influence of license plate inclination on character segmentation be eliminated.

[0053...

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Abstract

The invention, which relates to the computer vision field, provides a variable-length license plate character segmentation method based on hybrid tilt correction and a projection method. The method comprises the following steps that: horizontal license plate correction is carried out by using rotation invariance of a singular value of an image matrix and vertical license plate correction is carried out based on a Radon transform and horizontal shearing principle, thereby completing hybrid tilt correction of the license plate effectively and rapidly; various optimization pretreatment is carried out before license plate character segmentation, wherein image gray processing based on a weighted average method, elimination of license plate background non-character interference regions at the left side and the right side of the license plate based on license plate left-right boundary positioning, improved binary processing operation by combination of a global threshold value, a local threshold and an RGB color image, and binary image optimization based on a morphological method are carried out for optimization pretreatment; character image segmentation is carried out by using H-S connected domain analysis and projection methods; and then pseudo characters are eliminated by using a hue average statistical method of HSV space.

Description

technical field [0001] The invention relates to the field of computer vision, in particular to a method for segmenting license plate characters of indefinite length based on a hybrid tilt correction and projection method. Background technique [0002] Intelligent transportation system has become the mainstream direction of traffic management development. As a vehicle license plate recognition technology (License Plate Recognition, LPR) to realize traffic management automation, it has emerged at the historic moment. LPR system is widely used in electronic toll stations, parking lot vehicle management and other occasions. The license plate recognition system mainly consists of license plate image acquisition and preprocessing, license plate area location and extraction, license plate character segmentation and recognition, and other components. Among them, the license plate character segmentation processes the extracted license plate picture, divides it into individual charact...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06K9/34
CPCG06V30/1478G06V10/26G06V20/625
Inventor 陈蓉付东奇
Owner HUNAN VISION SPLEND PHOTOELECTRIC TECH
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