Texture-based license plate detection

First, the common license plate detection

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1. A method of vehicle license plate location based on edge detection

The vehicle license plate location process based on edge detection

Advantages: The method has high positioning accuracy, short reaction time, can effectively remove noise suitable for the image containing multiple license plates, and the positioning speed is very fast in the case of multi-license plate images.

Disadvantage: The case of severe fading of the license plate, because the detection of the edge of the character strokes will lead to failure, in the absence of external interference and plate tilt, the location of the area than the license plate slightly larger

2. The method of license plate location based on color segmentation

The license plate location process based on color segmentation

The correct rate of the algorithm is high, but the calculation speed is slower when the area color is similar to the nearby color because of the neural network method.

3. The method of vehicle license plate location based on wavelet analysis

The license plate location process based on wavelet transform

The method has good positioning effect and high segmentation accuracy in the case of small noise, and its disadvantage is that the speed is slow and the probability of mis-locating is increased when the noise is large.

4. License plate location based on genetic algorithm

License plate location process based on genetic algorithm

The speed of license plate location is greatly influenced by the number of iterations in the genetic algorithm.

5. License plate location method based on mathematical morphology

The process of license plate location based on mathematical morphology

Based on the mathematical morphology, the regional location method of license plate cannot accurately determine the position of the left and right boundary, so it must be accurately located with other positioning methods.

6. License plate location method based on texture feature analysis of gray image

License plate location process based on texture feature analysis of gray image

the algorithm has good effect on the plate tilt or deformation and the uneven illumination, weak or strong, but it is sensitive to the noise, and the background complex image can be combined with the vertical projection method to obtain the real license plate area, which can effectively solve the complicated background license plate location .

Second, texture-based license plate detection algorithm theory

Third, the algorithm effect

Texture-based license plate detection