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E2CAV, Software Tool to Estimate the Local Pavement Thickness using Computer Vision
E2CAV is a software tool which consolidates data information from two sub-systems. The first one, it is a image acquisition system based on a videoscope. And the another one, it is a vertical motion system which introduces the videoscope probe into a hole on the asphalt pavement. E2CAV has three software modules: configuration, image acquisition and report generation. The configuration module calibrates the videoscope camera, and the pixel / distance ratio. The image acquisition module synchronizes the vertical motion unit to capture images from the videoscope; afterwards, a mosaic is built, and it is used to detect the changes in texture using Gabor filters; then, the resulting images are post-processed in order to find the asphalt pavement layer thickness. And, the report module generates a PDF report of the pavement local thickness estimation. Actually, E2CAV is a registered software legally recognized by the Interior Ministry of Colombia. This document can be downloaded here.
The E2CAV configuration module is show in the figure at left. Here, users are able to do the following process:To modify the vertical motion unit parameters.
To communicate the PC with the vertical motion unit, and interchange the data parameters.
To define the texture segmentation method, either Gabor filters or Otzu.
To setup the parameters of the texture segmentation method selected.
Generating a PDF report with all information of the field test.
Once the configuration parameters are set, it is important to calibrate the videoscope camera in order to get its intrinsic parameters, and the pixel / distance ratio. This is done using the Acquisition module as depicted in the first two pictures at right.The calibration procedure to get the camera intrinsic parameters is done just one time; however, the pixel / distance ratio is important to compute each time a new hole on the pavement is done.
Once these tasks are finished, the acquisition module allows the user to perform the field test as follows:
The user must connect to the vertical motion unit.
The user request to the vertical motion unit upload the videoscope probe to the top.
The user can perform the acquisition procedure automatically, or manually.
When the automatic process is selected, the E2CAV tool and the vertical motion unit capture the image data according with the parameters specified in the configuration module.
On the other hand, the user can perform motion steps and capture the corresponding image.
When the images are captured, they are rectified and the mosaic is computed. Which is used to estimate the local pavement thickness using the texture segmentation method selected.
All intermediate steps of the image processing process are available.
At the end, the user can generate a report including all data of the field test.
This software was developed for industrial and service use. If you like to perform a field test, please contact me:
Prof. Bladimir Bacca Cortes Ph.D.
Address: Cra. 100, Street 13, Universidad del Valle, Melendez, Building 354, Office 1001.
Tel: +5723212100 Ext. 7656
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