GitHub - yuanshuoastro/hist_parallel: Parallelized histogram function

Branches Tags

Name		Name	Last commit message	Last commit date
Latest commit History 3 Commits
Makefile		Makefile
README.txt		README.txt
Timer.h		Timer.h
eout.ppm		eout.ppm
eqout.ppm		eqout.ppm
eqpout.ppm		eqpout.ppm
equalize		equalize
equalize.cpp		equalize.cpp
equalize_parallel		equalize_parallel
equalize_parallel.cpp		equalize_parallel.cpp
hist_parallel		hist_parallel
hist_parallel.cpp		hist_parallel.cpp
histogram		histogram
histogram.cpp		histogram.cpp
moon-small-copy.ppm		moon-small-copy.ppm
moon-small-copy.ppm.hist		moon-small-copy.ppm.hist
moon-small.ppm		moon-small.ppm
moon-small.ppm.hist		moon-small.ppm.hist
moonout.ppm		moonout.ppm
ppmb_io.a		ppmb_io.a
ppmb_io.c		ppmb_io.c
ppmb_io.h		ppmb_io.h
ppmb_io.o		ppmb_io.o
so.ppm		so.ppm

Repository files navigation

To compile:

  make

To run:

  ./histogram file.ppm

  ./equalize file.ppm file.ppm.hist outfile.ppm

You can use any image viewer (like eog) to view the ppm files.

Examples:

  ./histogram moon-small.ppm

  ./equalize moon-small.ppm moon-small.ppm.hist moon-small-equal.ppm

Note, after parallelization, you'll need to support a command line like below:

  ./histogram file.ppm 4

  ./equalize file.ppm file.ppm.hist outfile.ppm 4

where 4 is the number of threads to use.


ACKNOWLEDGEMENTS

moon-small.ppm, phobos.ppm, moon-large.ppm and earth.ppm are courtesy
NASA, the latter two from the Project Apollo Archive.

so.ppm is from a StackOverflow question
(https://dsp.stackexchange.com/questions/3372/relation-between-histogram-equalization-and-auto-levels),
hopefully as fair use.

PPMB_IO is (c) John Burkardt, and is used under the LGPL.

300px-Unequalized_Hawkes_Bay_NZ.ppm is from Wikipedia.

flood.ppm is from University of Regina.