Technical Application Note 004

Carridademo Region file Documentation

Revision:4.6.1
Date:2022-05-13
Contact:support@carrida-technologies.com
Copyright:2018-2022 Carrida Technologies GmbH, Ettlingen, Germany
Author:Carrida Support

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Table of Contents

1   Introduction

Region files are files that contain state/country specific information. This information can for example be the size and the font of letters and numbers, plate dimensions, format etc. Region file packages contain different countries and the full list of supported countries/states can be found in Supported countries documentation.

Hint

Hint Sign To obtain a new region file, contact Carrida support. You can also download region files from the Carrida homeoage carrida-technologies.com.

Using a suitable region file will improve the accuracy of the plate recognition according to the country/state parameter. You should always use a Carrida classifier file which supports the country or state in which you want to read license plates.

The "world" classifier file is provided as a default feature. It is suited to read license plates containing Latin letters (A-Z) and Arabic numerals (0-9). It does not contain state or region specific recognition information. For that reason, you will see the state recognition result as "WORLD" with "0%" recognition confidence.


Illustrated in the image below are two different readings of the same vehicle. The image on the left is using the world region file, and the image on the right is using a suitable European region file. The next section below describes how you can add new Carrida regions files to the Carridademo software on Windows.


./images/TAN0005-01.png

2   Uploading region files

Relevant region files are provided together with Carridademo software. They are located in a zip file. Follow the steps described below to properly add the file to the demo program.

Step 1

i1

Folders containing region files are provided in zip format. Once the folder is unzipped (as shown in image A) it should contain the files shown in the image B. For this example usa region files are used, the name differentiates by the requested area.


Step 2


i2

Select and copy the .ini file and the data folder (image A). Go to C:\CarridaTechnologies\ Carrida_X_X_X\carridademo and paste the items in the folder. This should create a new .ini file in the Carridademo folder and a .dat file in the data folder. In this example X_X_X is a placeholder for the software version number.


When the region file is copied correctly, the data file should contain the world_001.dat file and your new .dat file.

Note

Note Sign

The Carrida folder name will be different depending on the version installed.

3   Using region files

After copying the region files, open respectively restart Carridademo. You can find the Region file field in the right part of the GUI:


./images/TAN0005-04.png

Click on the arrow to open a drop down list and the newly added region file should appear. Selecting it on this list will automatically set it as a default region file. In case you have loaded multiple region files, switch between them by choosing a name from the list, it will then be set as default.

Note

Note Sign Only one region file can be active at the time.

If for some reason the required region file did not appear in the list, make sure that the program was restarted, or repeat the previous upload of the file.


To view included countries of operating region files, click on the Information button (i) right to the region file field.