/*############################################################################# * 文件名：fvs_direction.c * 功能：  指紋圖像方向圖計算 * modified by  PRTsinghua@hotmail.com#############################################################################*/#include "fvs.h"static FvsError_t OverlayDirection(FvsImage_t image, const FvsFloatField_t field){    FvsError_t nRet = FvsOK;    FvsInt_t w      = ImageGetWidth (image);    FvsInt_t h      = ImageGetHeight(image);    FvsInt_t pitch, dirp;    FvsFloat_t theta, c, s;    FvsByte_t* p;    FvsFloat_t* orientation;    FvsInt_t x, y, size, i, j, l;    size = 8;     (void)ImageLuminosity(image, 168);    pitch  = ImageGetPitch (image);    p      = ImageGetBuffer(image);    orientation = FloatFieldGetBuffer(field);    dirp        = FloatFieldGetPitch(field);    if (p==NULL || orientation==NULL)        return FvsMemory;    for (y = size; y < h-size; y+=size-2)    for (x = size; x < w-size; x+=size-2)    {        theta = orientation[x+y*dirp];        c = cos(theta);        s = sin(theta);                for (l = 0; l < size; l++)        {            i = (FvsInt_t)(x + size/2 - l*s);            j = (FvsInt_t)(y + size/2 + l*c);            p[i+j*pitch] = 0;        }    }    return nRet;}int main(int argc, char *argv[]){    FvsImage_t      image = ImageCreate();    FvsFloatField_t field = FloatFieldCreate();    if (argc!=3)    {        printf("Usage: fvs input.bmp output.bmp\n");        FloatFieldDestroy(field);        ImageDestroy(image);        return -1;    }    if ( (image!=NULL) && (field!=NULL) )    {        fprintf(stdout, "Opening file %s...\n", argv[1]);        (void)FvsImageImport(image, argv[1]);	(void)ImageSoftenMean(image, 3);        fprintf(stdout, "1/2 Determining the ridge direction\n");        (void)FingerprintGetDirection(image, field, 7, 8);        fprintf(stdout, "2/2 Creating a new image with the direction\n");        (void)OverlayDirection(image, field);        (void)FvsImageExport(image, argv[2]);        fprintf(stdout, "Cleaning up and exiting...\n");    }    FloatFieldDestroy(field);    ImageDestroy(image);    return 0;}