6533b85cfe1ef96bd12bc6f5

RESEARCH PRODUCT

A 3D multispectral integrated acquisition system : acquisition, data coding and compression

subject

description

We have developed an integrated system permitting the simultaneous acquisition of the 3D shape and the spectral spectral reflectance of scanned object surfaces. We call this system a 3D multispectral scanner because it combines within a stereopair, a multispectral video camera and a structured light projector. We see several application possibilities for a such acquisition system but we want to highlight applications in the field of digital archiving and broadcasting for heritage objects. In the manuscript we first introduce the acquisition system and its necessary calibrations and treatments needed for his use. Then, once the acquisition system is functional, data that are generated are rich in information, heterogeneous (mesh + reflectance, etc.) and in particular require lots of memory space. This fact makes data storage and transmission problematic, especially for applications like on line virtual museum. For this reason we study the different possibilities of representation and coding of data acquired by this system to adopt the most appropriate one. Then we examinate the most appropriate strategies to compress such data, without lost the generality on other data (satellite type). We perform a benchmark of compression strategies by providing an evaluation framework and improvements on existing conventional strategies. This first study will allow us to propose an adaptive approach that will be most effective for compression and particularly in the context of the compression strategy that we call Full-3D.