MPI_ImageProcessing

Simple implementation of a MPI parallel program for very basic image processing algorithm with C and MPI. The input are files representing the output from a very simple edge-detection algorithm applied to a greyscale image. The objective is to do the reverse operation and construct the initial image given the edges.

Compile with:

  > gcc mpi_image_processing.c pgmio.h pgmio.c -lmsmpi -o mpi_image_processing.exe

Run with:

  > mpiexec -n 4 mpi_image_processing.exe

where -n x sets the number of processes

Setup for windows:

1. Install MinGW
2. Install MS-MPI
3. Adapt MS-MPI for MinGW

• Create the libmsmpi64.a library with the MinGW64 tools gendef and dlltool

  > gendef msmpi.dll                                  # generate msmpi.def
  > dlltool -d msmpi.def -D msmpi.dll -l libmsmpi.a   # generate the (static) library file libmsmpi.a
  

• Copy the new library to where g++ looks for them, e.g. /mingw64/lib
• Modify the header file mpi.h. Add #include <stdint.h> above typedef __int64 MPI_Aint
• Copy the modified header file mpi.h to the default include folder e.g. /mingw64/include

For more details see:

• http://www.math.ucla.edu/~wotaoyin/windows_coding.html
• dev-cafe/autocmake#85