When using the probability matrix to pick from the candidate set, it is important that the candidate array be sorted in advance. Not doing so will fail to preserve the patterns distinctive of ordered dithering. A good approach is to sort the candidate colours by luminance, or the measure of a colour’s lightness4. When this is done, we effectively minimise the contrast between successive candidates in the array, making it easier to observe the pattern embedded the matrix.
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d = {"1": None}
(一)核材料,是指需要管制的核材料,包括铀—235及含铀—235的材料和制品,铀—233及含铀—233的材料和制品,钚—239及含钚—239的材料和制品,法律、行政法规规定的其他需要管制的核材料,不包括铀(钍)矿石及其初级制品。