United States Department of Transportation
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Evaluation of Proposed Standard Data Format and Compression Algorithms for 2D/3D Pavement Surface Image
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2019-12-01
[PDF-2.41 MB]
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Abstract:This report summarizes the work under FHWA contract DTFH6117P00139 to critically evaluate the standard data format for two-dimensional/three-dimensional (2D/3D) pavement surface images. First, the standard data format was clarified as a container-codec format, which meets the state of the practice of using 2D/3D images for pavement condition evaluation. Thus, it is convenient for the following implementation and application to support state highway agencies’ operation. Meanwhile, other existing data formats, e.g., OpenCRG, can also be included as an image codec, which provides flexibility for future extension to meet data users’ different needs. Second, the original 2D/3D standard data format was refined by providing additional description to further clarify the standard image representation, sensor system identification, range data registration, and other refinements. The refined 2D/3D standard data format was reviewed by several state highway agencies, 3D sensing technology vendors, and service providers. Third, to assess the refined 2D/3D standard data format, preliminary testing was performed in cooperation with a state highway agency and a 3D sensing technology vendor. The testing results showed that a data transfer using the refined standard data format can be successfully performed without loss of information. Thus, the 2D/3D data collected by a vendor can be stored in the standard data format and extracted by a state highway agency to perform pavement condition evaluation. Fourth, the compression algorithms evaluated in the original report were verified. The verification results showed some deviation from those in the original contract due to the absence of detailed parameter settings in the original report. Finally, a set of rules was recommended for a state highway agency to verify the data compliance of the standard data format, and recommendations were made for implementation of the standard data format.
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