Project IRENE Using optical scanning to digitize ethnographic field recordings on wax cylinders

Displaying and Reading Data: How to read a Depth image

The data taken during an optical scan is stitched together and displayed by a computer program. The program shows an overview of a large data set which can be a small portion of a cylinder, or an entire cylinder, and zoomed in view of the portion of the cylinder in the yellow rectangle. The software also displays a point by point profile of the data. Position on the vertical axis of the image corresponds to position in the rotational direction, around the circumference of the cylinder. Position on the horizontal axis of the image corresponds to position along the length of the cylinder and the grey scale value of the image corresponds to the height of the surface. White is highest on the surface and black is deepest into the surface. Displaying data in this way makes it easy to run image processing algorithms like edge finding and blob detection that enable producing sound and reducing the effect of blemishes.
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Exhibit Tags:
diagram, method, and image processing