Читать книгу Deeper into the Darkness онлайн

113 страница из 184

In photogrammetry, the camera operator very slowly pans over sections of the wreck or an individual object. Each one of the hundreds of frames that make up the moving picture images would be taken from a slightly different angle. Once the underwater imagery was downloaded topside into powerful laptops, specialist computer software takes frame captures from the video footage and produces a basic point cloud within a few hours of processing. The point cloud image of the wreck begins to appear on the screen as literally thousands of points – but as the processing goes on, the points become more defined and the shape of the wreck begins to appear. Further computer processing of the point cloud raw data is then carried out whereby the software triangulates between recognisable points of data in each frame and is able to refine the raw image to give a lifelike 3D image that a viewer can ‘fly’ around on a computer and explore in detail. We aimed to make the 3D photogrammetry model available online for the public good so that maritime archaeologists, historians and other interested folk can study it in detail in the future, without having to physically dive it. I will be interested to see what information can be brought out by such specialists from our work in due course.