Image orientation maps

What is the most common开发者_JAVA百科 way to get 4 Orientaton maps at 0, 45, 90 and 135 angles from Image. I want to apply orientation kernels. Is that good solution ?

for 0 orientation -1 -1 -1 2 2 2 -1 -1 -1

for 45 orientation -1 -1 2 -1 2 -1 2 -1 -1

for 90 orientation -1 2 -1 -1 2 -1 -1 2 -1

for 135 orientation 2 -1 -1 -1 2 -1 -1 -1 2

Cheers, roboto

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Presuming that these are indeed 3x3 kernels, and that by "orientation maps" you mean crude indication of orientation on the smallest scale - yes, this'll do.

If you are not sure what exactly you want, your best shot is to implement these kernels, take a look a the results on a couple of examples, and decide whether you like what you see, and if not, why - and then come back here if you want to.