MJ [49] Upsampling

Question:

you have an img data as an array, output the data for upsampling. For example, 
[1, 2, 3, 4, 5, 6] as width 3(2 rows) ==> upsample 2 times would be [1 1 2 2 3 3 1 1 2 2 3 3 4 4 5 5 6 6 4 4 5 5 6 6]
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Ref
[1] http://www.mitbbs.com/article_t/JobHunting/33110511.html