SimpleLPR License Plate Recognition SDK

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Automatic recognition of Spanish license plates

SimpleLPR is a software component aimed at vehicle license plate recognition. It has a very simple application programming interface that allows applications to supply a path to an image and to get in return the detected license plate number and its position in the image.

It can be used from any COM enabled programming language such as C++, Java, Visual Basic .NET, C#, VB Script or JScript. Integration is simple and straightforward as demonstrated in the examples supplied with the SDK.

Typical successful detection rates range from 85% to 95% provided that license plates are in good condition, unoccluded and their characters are taller than 32 pixels.

The current version of SimpleLPR ONLY SUPPORTS SPANISH LICENSE PLATES. Square, trailer and diplomatic personnel license plates are also not supported.

SimpleLPR is shipped as COM server dll. To make it available for applications it must be first installed into the system registry. To register the component you can use the supplied register.bat batch script.

To check that the component has been properly registered click on the ".\samples\VBScript\Detect.vbs" file. A message box displaying the recognition results for the sample license plate picture should pop up.

To integrate SimpleLPR into your own application it is recommended that you first have a look at the samples included in the SDK. Examples are provided for the C#, C++ and VBScript programming languages.

Pictures can be supplied in either JPEG, TIFF or BMP formats.

• Windows 2000
• Windows 2000 Server
• Windows XP
• Windows Vista
• Windows 2003 Server
• Windows XP 64 (*)
• Windows 2003 Server 64 (*)
• Windows Vista 64 (*)

(*) Tested on these platforms. Native 64 bit module not provided.

• The current version PROVIDES SUPPORT FOR SPANISH LICENSE PLATES ONLY.
• Pictures must be in RGB colorspace. Either JPEG, TIFF or BMP formats are supported
• License plate pictures should be taken at a straight angle. For better results they should be also horizontal.
• License plate characters should be taller than 32 pixels and unoccluded.
• Assuming that the pictures comply with the above conditions, the success rate should be about 90%.

Here you can download an unlicensed copy of SimpleLPR for evaluation purposes.

Here you can obtain a licensed copy of SimpleLPR.

Registration

The unlicensed version is fully functional. Until registration it will pop up a dialog box each time the Analyze method gets called.

The licensed version costs 50€. Upon licensing the pop up dialog gets disabled. The license grants you rights to distribute a royalty free unlimited number of copies of SimpleLPR along with your application.

Future versions of SimpleLPR will target at supporting european license plates and improving the detection rate.

Owners of the licensed version of SimpleLPR can submit their questions/issues/bug reports/feedback to support@warelogic.com