Framing method for license plate in RGB format

A vehicle license plate and image positioning technology, applied in character and pattern recognition, instruments, computer components, etc., can solve the problems of general effect, increase of unstable factors of license plate positioning, and affect the performance of license plate recognition system, etc., and achieve the goal of improving accuracy Effect

Inactive Publication Date: 2013-08-28
SHANGHAI DIANJI UNIV
View PDF1 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of the background of the vehicle and the influence of different lighting conditions, the instability of the license plate location increases

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Framing method for license plate in RGB format
  • Framing method for license plate in RGB format
  • Framing method for license plate in RGB format

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The specific implementation manner of the vehicle license plate image positioning method in RGB format of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] See attached figure 1 , the license plate image positioning method of the present invention includes the following steps.

[0030] Step 1: Convert the license plate image from RGB space to HSV space ( figure 1 in step S01).

[0031] For this step, please refer to "Achievement of RGB and HSV Color Space Conversion Algorithm Based on FPGA" edited by Yuan Fenjie, Zhou Xiao, Ding Jun, etc. (Electronic Devices, 2010, 33(4):493-497.), which uses the following image application formula Convert an image from RGB space to HSV space.

[0032] The formula for hue H in HSV space is:

[0033] 0°,max=min

[0034] max=R,G≥B

[0035] max=R,G

[0036] max=G

[0037] max=B

[0038] The formula for saturation S is:

[0039] 0,max=0

[0040] ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to the technical field of vehicle license plate recognition, and discloses a framing method for a license plate in an RGB format. The framing method includes the following steps of converting a license plate image from RGB space to HSV space, separating an HSV component of the image from the image, conducting homomorphic filtering on an luminance component V, converting the image HSV component from the HSV space to an RGB component in the RGB space, determining a luminance threshold value of the RGB component, scanning the license plate image in a line direction and a row direction, recording pixel points of colors dropping into a luminance threshold value range, determining lines and rows where a license plate range is located according to pixel points in each line and pixel points in each row, and displaying pixel points of the lines and rows where the license plate range is located. According to the framing method for the license plate in the RGB format, preprocessing is conducted on a vehicle image with a poor light condition, excessively bright or excessively dark or shaded influence caused by uneven illumination, polarized light, side light, highlight and the like on the vehicle image can be eliminated, and the accuracy rate of license plate location is improved.

Description

technical field [0001] The invention relates to the technical field of vehicle license plate recognition, in particular to a method for locating a vehicle license plate image in an RGB format. Background technique [0002] With the rapid development of social economy and the sharp increase of the number of cars, new challenges are brought to traffic control, safety management and toll management. The license plate is the unique "identity" of the vehicle. Therefore, the research on license plate recognition has become a hot issue in intelligent transportation systems. At present, the following types of algorithms are mainly used for license plate location at home and abroad: methods based on edge detection, methods based on color features, methods based on mathematical morphology, methods based on neural networks, methods based on genetic algorithms, etc. Due to the complexity of the background where the vehicle is located and the different lighting conditions, the unstable ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06K9/60
Inventor 胡之惠陈布雨杨宇李渊范光宇
Owner SHANGHAI DIANJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap