#Parallella FFT cross-correlation demo
##TODO
- Do calculations on device.
- Use FFT to calculate correlation.
- Don't reinitialize COPRTHR on every call to xcorr().
- ??? jpeg: Remove hack that scales images down to < 64x64 (?)
- FFTW implementation
##Generate data set Labeled Faces in the Wild
which mogrify || sudo apt-get install -qq imagemagick imagemagick-common
wget http://vis-www.cs.umass.edu/lfw/lfw.tgz
tar xfz lfw.tgz
cd lfw
find . -type f -exec mogrify -gravity southwest -background black \
-extent 256x256 -resize 64x64 -colorspace Gray '{}' ';'
##Dependencies
###libjpeg
###COPRTHR
Use this repo (parallellocalypse branch):
https://github.com/olajep/coprthr
./configure --enable-epiphany
make
sudo make install
This will install COPRTHR to /usr/local/browndeer
###COPRTHR-MPI
Binary here:
http://www.browndeertechnology.com/code/bdt-libcoprthr_mpi-preview.tgz
Blog post:
https://www.parallella.org/2015/04/09/threaded-mpi-for-the-epiphany-architecture
##Build program and library
make IMPL=coprthr
or (TODO)
make IMPL=fftw
This will generate a test program test-IMPL and a shared library
libfft-demo-IMPL.so. If you want to build for both targets, run once for
each implementation.
The library exports this xcorr function:
bool calculateXCorr(uint8_t *jpeg1, size_t jpeg1_size,
uint8_t *jpeg2, size_t jpeg2_size,
float *corr)