All of the examples demonstrating ordered dithering so far have been produced using a specific type of threshold matrix commonly known as a Bayer matrix. In theory however any matrix could be used and a number of alternatives are available depending on your qualitative preference. Matrices also don’t have to be square or even rectangular; polyomino-based dithering matrices have been explored as well[6].
The machine that came out of this initiative was called ERMA, the Electronic
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Following its discovery, it was carefully lifted out of the earth in a soil block and scanned to work out where the items were positioned, before conservation began.