/home/christophe/src/fulguro/trunk/apps/python/example5/example5.py

#!/usr/bin/env python
## @example example5.py
# 

##############################################################################
# Example for testing Quasi Distance Transformation on Gray Level Images     #
##############################################################################



from fulguro import *

### PROCEDURES #########################################################
def benchmark(function,nbiter,*args):
    import time
    t=time.time()
    for i in range(nbiter):
        function(*args)
    t2=time.time()
    return ((t2-t)*1000)/nbiter



def quasiDistance(im_indicatrice, im_associe, imin, connexity):
    nhb = FLGR_Data2D(imin.spp,imin.type,connexity)
    imw1 = FLGR_Data2D(imin)
    imw2 = FLGR_Data2D(imin)
    imtemp1 = FLGR_Data2D(imin)

    flgr2d_copy(imw1,imin)
    flgr2d_clear_all(im_indicatrice)
    flgr2d_clear_all(im_associe)

    vol1 = flgr2d_measure_volume(imw1)[0]
    vol2 = vol1+1
 
    i=0

    while vol2>vol1:
        i += 1
        vol2 = vol1
         
        flgr2d_erode(imw2, imw1, nhb)
        flgr2d_arith_sub(imw1, imw1, imw2)

        flgr2d_replace(imtemp1,imw1,">=",im_associe,i,0);
 
        flgr2d_arith_sup(im_indicatrice, imtemp1, im_indicatrice)
        flgr2d_arith_sup(im_associe, imw1, im_associe)

        flgr2d_copy(imw1,imw2)
        
        vol1 = flgr2d_measure_volume(imw1)[0]
    #print i
    #flgr2d_replace(im_indicatrice, im_indicatrice, "==", i, 0, im_indicatrice)
 

def descente(imout,imin,connexity):
    nhb = FLGR_Data2D(imin.spp,imin.type,connexity)
    imw1 = FLGR_Data2D(imin)
    imw2 = FLGR_Data2D(imin)
    imtemp1 = FLGR_Data2D(imin)
    imtemp2 = FLGR_Data2D(imin)
  
    flgr2d_copy(imw1,imin)

    vol1 = flgr2d_measure_volume(imw1)[0]
    vol2 = vol1 + 1

    i=0
        
    while vol2>vol1:
        i = i + 1
        vol2 = vol1
        
        flgr2d_erode(imw2, imw1, nhb)
        flgr2d_arith_sub(imtemp1,imw1,imw2)
        flgr2d_arith_add(imtemp2,imw2,1)

        #flgr2d_replace(imw1, imtemp1, ">=", 2, imtemp2, imw1)
        flgr2d_arith_inf(imw1,imtemp2,imw1)

        vol1 = flgr2d_measure_volume(imw1)[0]

    flgr2d_copy(imout,imw1)


##################################################################
### MAIN #########################################################
##################################################################

imin = flgr2d_load_pgm('../../images/gray/cameraman.pgm')
imqdist1 = FLGR_Data2D(imin)
imresidu = FLGR_Data2D(imin)
imqdist2 = FLGR_Data2D(imin)


#flgr2d_arith_invert(imin,imin)

print "Quasi distance time : ",benchmark(quasiDistance,20,imqdist1,imresidu,imin,FLGR_8_CONNEX),"ms"

print "Descente time : ",benchmark(descente,20,imqdist2,imqdist1,FLGR_8_CONNEX),"ms"

flgr2d_save_pgm(imqdist1,"quasidistance_perche_fulguro")
flgr2d_save_pgm(imqdist2,"quasidistance_fulguro")

flgr2d_save_pgm(imresidu,"quasidistance_residu_fulguro")

flgr_display(imin,"imin",
             imqdist2,'quasidistance',
             imresidu,'residu')

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