(December 2009)

Remote Mixed Resolution Scans: Historical Cemetery in Lexington Kentucky

Updated 10-31-2010

In December 2009, Dr. Hassebrook constructed a battery operated Mixed Resolution scanner shown below:

The unit above can scan at any angle and is battery operated. It requires a tethered laptop to operate the system but gives immediate feedback to the operators. Chris Begley, Laurence Hassebrook and Walter Lundby tested the unit out on a historical site in Lexington Kentucky. It is important to see what the headstones say so we used two levels of depth enhancement, surface normal rendering which basically treats the surface like a metallic one and depth encoding that we developed for visualizing 3-D fingerprint ridges. The data is ordered in easiest to most difficult, in reading the text.

Above: One of the most historical stones. Sister Ann Spalding died in 1848. It should be noted that our team thought that the date was 1818 until we performed the scan. The thin front line of the four along with the angle of the primary groove differentiate the “4” from the “1”.

Above: A vertical stone dating to 1861 for Mary Ann.

Above: Horizontal stone. Note the far right where we viewed the relief from the back side so the letters stand out from the surface. This way, the least worn part of the text is the most exposed in 3-D space.

Above: The most difficult stone that we found is shown above. It starts out with “In Memory of” and gets more difficult to read from there. The problem with this one is there are grooves similar to that of lettering that clutters the stone. As you look at the renderings you may start to see the underlying text. Our conjecture is that this text is salvageable.

DATA

You will need to use the GL3DView.exe application to view and/or convert the data to other formats. The MAT5 format is an open format and the input C source code is available. In general the data is either 2 mega pixel or 8 mega pixel in size. We use WinZip with their special ZIPX mode for double the compression. We provide the original jpeg texture image, when available, along with the skinned data at different resolutions from the depth resolution (LR), and 2X (four times more pixels).

Scan 0: Original JPEG photo, 2MegaPixel(Low Res LR) MAT5, 8MegaPixel(2X) MAT5 (.zipx)

Scan 4: 2MegaPixel(Low Res LR) MAT5

Scan 5: Original JPEG photo, 2MegaPixel(Low Res LR) MAT5, 8MegaPixel(2X) MAT5 (.zipx)

Scan 6: Original JPEG photo, 2MegaPixel(Low Res LR) MAT5, 8MegaPixel(2X) MAT5 (.zipx)

Scan 7: 2MegaPixel(Low Res LR) MAT5

Scan 8: Original JPEG photo, 2MegaPixel(Low Res LR) MAT5, 8MegaPixel(2X) MAT5 (.zipx)