CGAL users discussion list

[Laurent Saboret <>]

Hi Mario,

Please check that you use the latest version of TAUCS:
* on Windows, the recommend way is to use CGAL installer and select the option to download TAUCS (precompiled)
* on Unix, you need to download taucs_full.tgz from https://gforge.inria.fr/frs/?group_id=52 (in section "TAUCS 3.5"), then compile and install it

When TAUCS is installed, you should run again cmake and make (or compile in Visual Studio).

Best regards,
Laurent Saboret


Le 14/09/2011 19:39, Mario Ynocente Castro a écrit :

Hi everyone, i'm testing a method for Poisson Image Editing. However I'm getting the following error : taucs_ccs_ops.c:185: taucs_dccs_permute_symmetrically: Assertion `A->flags & 8 || A->flags & 16' failed.

I've tested  the same method in Visual Studio (seems like it uses a previous version of taucs though), everything seems to

be working in the same way, except for Lmatrix->get_taucs_matrix(), in that version it takes totalpixel as a parameter.

void PoissonImageEditing(float* Fdx, float* Fdy, float* result, int width, int height){

int x,y,index;

int totalpixel = width*height;

//No mask, compute the image from gradient

TaucsMatrix* Lmatrix = new TaucsMatrix(totalpixel, totalpixel, false);

double* Bvector = new double[totalpixel];

memset(Bvector, 0, totalpixel*sizeof(double));

for(y = 0, index = 0; y < height; y++){

for(x = 0; x < width; x++, index++){

//This is second derivative equation

int c = 0;

if( x > 0 ){

Lmatrix->set_coef(index, index-1, -1);

Bvector[index] += Fdx[index];

c++;

}

if( x < width-1 ){

Lmatrix->set_coef(index, index+1, -1);

Bvector[index] -= Fdx[index+1];

c++;

}

if( y > 0 ){

Lmatrix->set_coef(index, index-width, -1);

Bvector[index] += Fdy[index];

c++;

}

if( y < height-1 ){

Lmatrix->set_coef(index, index+width, -1);

Bvector[index] -= Fdy[index+width];

c++;

}

if(c > 0){

Lmatrix->set_coef(index, index, c);

}

}

}

char* solve [] = {"taucs.factor.LU=true", NULL};

int error_code;

    

double* tempResult = new double[totalpixel];

memset(tempResult, 0, totalpixel*sizeof(double));

taucs_ccs_matrix* tm = (taucs_ccs_matrix*)Lmatrix->get_taucs_matrix();

printf("Solve Matrix: %d\n", totalpixel);

error_code = taucs_linsolve( tm, NULL, 1, tempResult, Bvector, solve, NULL);

if(error_code != TAUCS_SUCCESS){

printf("Solver Failed\n");

}

for(index = 0; index < totalpixel; index++){

tempResult[index] += 0.5f;

if(tempResult[index] < 0) tempResult[index] = 0;

if(tempResult[index] > 1) tempResult[index] = 1;

result[index] = (float)(tempResult[index]);

}

delete Lmatrix;

delete [] Bvector;

delete [] tempResult;

}

--
Mario Ynocente Castro
Undergraduate Student of System Engineering
National University of Engineering, Peru