Values of N passed to sub_divide seem wrong

[ajeb78]

In bm3d.cpp, lines 272, 304, 307 and 341 seem to do the following:

• chop the image into pieces with border 2 * nWien
• reassemble the image based on subimages with borders 2 * nHard
• chop the image into subimages with borders 2 * nHard
• reassemble the image based on subimages with borders 2 * nWien

Shouldn't the values of N for chopping the image up and reassembling it be the same? In practice it doesn't matter because nWien and nHard are both defined as the same value, but if one value was changed it seems the result would not be good. I think the parameters on those lines should respectively be 2 * nHard, 2 * nHard, 2 * nWien, 2 * nWien.