Road traffic sign detecting method based on phase symmetry

A technology for road traffic and sign detection, applied in image data processing, instrument, character and pattern recognition, etc., can solve the problems of lack of convincing and acceptance of experimental results.

Inactive Publication Date: 2016-08-24
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, most of the existing detection methods are limited to one or several types of traffic sign detection, and the expe...

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  • Road traffic sign detecting method based on phase symmetry
  • Road traffic sign detecting method based on phase symmetry
  • Road traffic sign detecting method based on phase symmetry

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Embodiment Construction

[0058] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. The road traffic sign detection method based on phase symmetry, the specific steps are described in the attached figure 1 Shown:

[0059] Step (1): Red and blue normalization preprocessing

[0060] 1-1. Perform weighted calculation on the red and blue channel values ​​of the RGB input image, perform red and blue processing on the image, and obtain a single-channel image Ω RB ,specific:

[0061] For each pixel in the RGB input image (road acquisition image) x={x R ,x G , x B}, according to the formulas (1) and (2) to carry out the weighted calculation of the R channel and the B channel of the RGB input image. Among them, R' is the weighted R channel value, and B' is the weighted B channel;

[0062] R ′ = m a x ( 0 ...

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Abstract

The invention discloses a road traffic sign detecting method based on phase symmetry. The flows of the method comprise red-blue standardization pretreatment, phase symmetry detection, morphological filtering, and maximally stable extremal region (MSER) feature detection. Specifically, the method comprises: performing color pre-segmentation on an image by a red-blue standardization method according to the characteristic red or blue of a traffic sign; computing a highlight prominent traffic sign candidate region by using phase symmetry according to the symmetry of the external shape of the traffic sign; and extracting a sign candidate region from a phase symmetry energy diagram by using MSER features. The method is suitable for detection of road traffic signs in complex natural environment and has better detection effects. Further, compared with a conventional detection method just based on color or shape information, the method has better robustness in complex road scenarios by using the color and shape characteristics of the traffic signs.

Description

technical field [0001] The invention mainly relates to the field of traffic sign recognition, in particular to a phase symmetry-based detection method for road traffic signs, which is applicable to the detection of road traffic signs in complex natural environments. Background technique [0002] Road traffic sign recognition is an important part of road environment perception technology in automobile automatic driving and assisted driving systems. It mainly captures road scene information through vehicle imaging systems, detects and recognizes traffic signs from them, and converts the obtained road traffic information Feedback to the driver in time to help the driver take appropriate countermeasures, thereby effectively reducing the occurrence of traffic accidents and improving driving safety and comfort. However, in natural scenes, factors such as drastic changes in lighting conditions, severe weather conditions, and interference from the surrounding environment have brough...

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Application Information

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IPC IPC(8): G06K9/00G06T7/40
CPCG06T2207/20104G06V20/54
Inventor 徐向华王淑丹
Owner HANGZHOU DIANZI UNIV
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