29.12.2014

Number plate recognition project report

License Plate Recognition is special type of OCR and therefore the definition of License Plate Recognition should clearly reflect that it is indeed an OCR.
We do share this view: License Plate Recognition actually means a software that is able to read the license plate text from a digital image of a vehicle.
The input of the LPR Software is a digital image, while the output is the raw plate text in ASCII. All other software or software modules of an LPR system (GUI, video capturing, image saving and loading, database searches, data transfers, etc.) are not considered to be part of a License Plate Recognition Software. Let's see here what the main steps of license plate recognition are, what a license plate recognition software usually has to go through. As first step, the LPR algorithm should determine the locations of the license plate candidates if any. If there is a plate, it has to be as precisely localised (located) as possible and then extracted from the image for further processing.


Segmentation becomes difficult when the plate is not clear, the characters are touching each other, there are screws or strong light-effects (like shadows) on the plate, etc. The output of each character recognition process is the ASCII code of the given character image.
The License Plate Recognition Software therefore should have an Application Programming Interface (API). The API is a series of functions that application programs can use to make the license plate recognition software do the painful work of recognition.
It provides an interface between the processes of the application and the core image recognition tasks of license plate recognition. In order to work with the API - to develop applications using the functions offered by the API - software developers need proper documentation, sample codes and program tools for the API.
The collection of this documentation, set of programs and tools are called Software Development Kit (SDK).


The License Plate Recognition Software Development Kit thus should include everything developers need to write, build, test, and deploy license plate recognition enabled applications. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Your use of this website constitutes acknowledgement and acceptance of our Terms & Conditions.



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