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].
A further 31 councils have secured agreements allowing for a later start date for their weekly food collections, so will not be viewed as missing the deadline.
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free_table[j] = h-next_free;