A feasibility study on the three-dimensional reconstruction of high voltage and lightning descharge channels using digital images

摘要

The work presented extends and contributes to research in the visualisation ofuddischarge channels with an expectation to extend to lightning channels. Althoughudprevious work in this area has produced three-dimensional (3D) information ofuddischarge channels, there has not been a method to visualise the channel andudthe characteristics of its shape in a 3D environment. In the research presented,udphotographed discharge channels are reconstructed in a virtual interactive 3D envi-udronment.udIt is found that single-channelled discharges produce models that correctly follow theudinferred channel paths from the photograph datasets. Single-channelled dischargesudhave also been veri ed in the controlled laboratory environment, providing con -uddence in the two-image reconstruction algorithm. The algorithm is shown to failudfor an angular separation of cameras less than 15 , which produces thicker channeludsegments. It is further shown that branched discharge channels can produce modelsudthat correctly follow the channel paths. If images are not accurately normalisedudfor lens correction and slight camera tilts, missing segments and duplication ofudreconstructed branches are evident in the models. Furthermore, it is shown thatudthe algorithm also fails for image perspectives with angular separations less thanud15 , additional redundant branches are produced in addition to thicker channeludsegments.