Am Mittwoch, 17. September 2008 01:43:45 schrieb Brendan Simons:
On 16-Sep-08, at 4:50 AM, Stéfan van der Walt wrote:
I may be completely off base here, but you should be able to do this
*very* quickly using your GPU, or even just using OpenGL. Otherwise,
coding it up in ctypes is easy as
Hey Brendan
2008/9/17 Brendan Simons [EMAIL PROTECTED]:
I would love a c-types code snippet. I'm not very handy in c. Since
I gather numpy is row-major, I thought I up and down crops very
quickly by moving the start and end pointers of the array. For
cropping left and right, is there a
A Wednesday 17 September 2008, Brendan Simons escrigué:
[clip]
I would love a c-types code snippet. I'm not very handy in c. Since
I gather numpy is row-major, I thought I up and down crops very
quickly by moving the start and end pointers of the array. For
cropping left and right, is there
Hi everyone
I have a quick problem. I'm trying to write a routine to demosaic video data
extremely quickly. I thought my algorithm would make good use of my
processor's vector math units, but it isn't fast enough (it currently takes
about 300ms for each 8 megapixel frame) Maybe you can help
Hi Brendan
2008/9/16 brendan simons [EMAIL PROTECTED]:
#interpolate the green pixels from the bayer filter image ain
g = greenMask * ain
gi = g[:-2, 1:-1].astype('uint16')
gi += g[2:, 1:-1]
gi += g[1:-1, :-2]
gi += g[1:-1, 2:]
gi /= 4
gi += g[1:-1, 1:-1]
return gi
I may be completely
Brendan,
Not sure if I understand correctly what you want, but ...
Numpy vector operations are performed in C, so there will be an iteration
over the array elements.
For parallel operations over all pixels, you'd need a package that talks to
your GPU, such as pyGPU.
I've never tried it and if
Why would I need the GPU to do parallel operations? I thought most
modern processors have vector units. I just don't know if there's a
way to have my code use them.
I tried a quick test with pyopengl (as quick as can be done in that
crazy api), but I found adding two textures of the same
On 16-Sep-08, at 4:50 AM, Stéfan van der Walt wrote:
Hi Brendan
2008/9/16 brendan simons [EMAIL PROTECTED]:
#interpolate the green pixels from the bayer filter image ain
g = greenMask * ain
gi = g[:-2, 1:-1].astype('uint16')
gi += g[2:, 1:-1]
gi += g[1:-1, :-2]
gi += g[1:-1, 2:]
gi /=
Brendan Simons wrote:
Why would I need the GPU to do parallel operations? I thought most
modern processors have vector units. I just don't know if there's a
way to have my code use them.
Yes, modern CPU have vector units, but to use them efficiently, you have
to use assembly or specially
