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#include "dcp_core.h"
void GuidedFilterColor(IplImage *q, IplImage *II, IplImage *p, double eps, int r)
{
int height = q->height;
int width = q->width;
int widthstep = II->widthStep;
int gwidthstep = p->widthStep;
int nch = II->nChannels;
int i, j;
int m, n;
int w;
int e = 0;
int st_row, ed_row;
int st_col, ed_col;
double sum_Ir, sum_Ig, sum_Ib;
double sum_Ir_square, sum_Ig_square, sum_Ib_square;
double sum_IrIg, sum_IgIb, sum_IrIb;
double sum_PiIr, sum_PiIg, sum_PiIb;
double sum_Pi;
double A, B, C, D, E, F, G, H, I, J, K, L;
double X, Y, Z;
double ak_r, ak_g, ak_b;
double bk;
double det;
double tmp_Ir, tmp_Ig, tmp_Ib;
double tmp_p, tmp_q;
double *v_ak_r = (double *)malloc(sizeof(double) * height * width);
double *v_ak_g = (double *)malloc(sizeof(double) * height * width);
double *v_ak_b = (double *)malloc(sizeof(double) * height * width);
double *v_bk = (double *)malloc(sizeof(double) * height * width);
int count = 0;
for (i = 0; i < height; i++)
{
for (j = 0; j < width; j++)
{
st_row = i - r, ed_row = i + r;
st_col = j - r, ed_col = j + r;
st_row = st_row < 0 ? 0 : st_row;
ed_row = ed_row >= height ? (height - 1) : ed_row;
st_col = st_col < 0 ? 0 : st_col;
ed_col = ed_col >= width ? (width - 1) : ed_col;
sum_Ir = sum_Ig = sum_Ib = 0;
sum_Ir_square = sum_Ig_square = sum_Ib_square = 0;
sum_IrIg = sum_IgIb = sum_IrIb = 0;
sum_PiIr = sum_PiIg = sum_PiIb = 0;
sum_Pi = 0;
w = 0;
for (m = st_row; m <= ed_row; m++)
{
for (n = st_col; n <= ed_col; n++)
{
tmp_Ib = *(uchar *)(II->imageData + (m) * widthstep + (n) * nch);
tmp_Ig = *(uchar *)(II->imageData + (m) * widthstep + (n) * nch + 1);
tmp_Ir = *(uchar *)(II->imageData + (m) * widthstep + (n) * nch + 2);
tmp_p = *(uchar *)(p->imageData + (m) * gwidthstep + (n));
sum_Ib += tmp_Ib;
sum_Ig += tmp_Ig;
sum_Ir += tmp_Ir;
sum_Ib_square += tmp_Ib * tmp_Ib;
sum_Ig_square += tmp_Ig * tmp_Ig;
sum_Ir_square += tmp_Ir * tmp_Ir;
sum_IrIg += tmp_Ir * tmp_Ig;
sum_IgIb += tmp_Ig * tmp_Ib;
sum_IrIb += tmp_Ir * tmp_Ib;
sum_Pi += tmp_p;
sum_PiIb += tmp_p * tmp_Ib;
sum_PiIg += tmp_p * tmp_Ig;
sum_PiIr += tmp_p * tmp_Ir;
w++;
}
}
A = (sum_Ir_square + w * eps) * sum_Ig - sum_Ir * sum_IrIg;
B = sum_IrIg * sum_Ig - sum_Ir * (sum_Ig_square + w * eps);
C = sum_IrIb * sum_Ig - sum_Ir * sum_IgIb;
D = sum_PiIr * sum_Ig - sum_PiIg * sum_Ir;
E = (sum_Ir_square + w * eps) * sum_Ib - sum_IrIb * sum_Ir;
F = sum_IrIg * sum_Ib - sum_IgIb * sum_Ir;
G = sum_IrIb * sum_Ib - (sum_Ib_square + w * eps) * sum_Ir;
H = sum_PiIr * sum_Ib - sum_PiIb * sum_Ir;
I = (sum_Ir_square + w * eps) * w - sum_Ir * sum_Ir;
J = sum_IrIg * w - sum_Ig * sum_Ir;
K = sum_IrIb * w - sum_Ib * sum_Ir;
L = sum_PiIr * w - sum_Pi * sum_Ir;
det = A * F * K + B * G * I + C * E * J - C * F * I - A * G * J - B * E * K;
X = D * F * K + B * G * L + C * H * J - C * F * L - D * G * J - B * H * K;
Y = A * H * K + D * G * I + C * E * L - C * H * I - D * E * K - A * G * L;
Z = A * F * L + B * H * I + D * J * E - D * F * I - B * E * L - A * H * J;
ak_r = X / det;
ak_g = Y / det;
ak_b = Z / det;
bk = (sum_PiIg - sum_IrIg * ak_r - (sum_Ig_square + w * eps) * ak_g - sum_IgIb * ak_b) / sum_Ig;
tmp_Ib = *(uchar *)(II->imageData + i * widthstep + j * nch);
tmp_Ig = *(uchar *)(II->imageData + i * widthstep + j * nch + 1);
tmp_Ir = *(uchar *)(II->imageData + i * widthstep + j * nch + 2);
tmp_q = ak_b * tmp_Ib + ak_g * tmp_Ig + ak_r * tmp_Ir + bk;
tmp_q = tmp_q > 255 ? 255 : (tmp_q < 0 ? 0 : tmp_q);
*(uchar *)(q->imageData + i * gwidthstep + j) = cvRound(tmp_q);
v_ak_b[count] = ak_b;
v_ak_g[count] = ak_g;
v_ak_r[count] = ak_r;
v_bk[count] = bk;
count++;
}
}
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
st_row = i - r, ed_row = i + r;
st_col = j - r, ed_col = j + r;
st_row = st_row < 0 ? 0 : st_row;
ed_row = ed_row >= height ? (height - 1) : ed_row;
st_col = st_col < 0 ? 0 : st_col;
ed_col = ed_col >= width ? (width - 1) : ed_col;
double ak_r, ak_g, ak_b, bk;
ak_r = ak_g = ak_b = bk = 0;
int number = 0;
for (int m = st_row; m <= ed_row; m++)
{
for (int n = st_col; n <= ed_col; n++)
{
ak_r += v_ak_r[(m) * width + n];
ak_g += v_ak_g[(m) * width + n];
ak_b += v_ak_b[(m) * width + n];
bk += v_bk[(m) * width + n];
number++;
}
}
ak_r /= number;
ak_g /= number;
ak_b /= number;
bk /= number;
tmp_Ib = *(uchar *)(II->imageData + i * widthstep + j * nch);
tmp_Ig = *(uchar *)(II->imageData + i * widthstep + j * nch + 1);
tmp_Ir = *(uchar *)(II->imageData + i * widthstep + j * nch + 2);
tmp_q = ak_b * tmp_Ib + ak_g * tmp_Ig + ak_r * tmp_Ir + bk;
tmp_q = tmp_q > 255 ? 255 : (tmp_q < 0 ? 0 : tmp_q);
*(uchar *)(q->imageData + i * gwidthstep + j) = cvRound(tmp_q);
}
}
free(v_ak_b);
free(v_ak_g);
free(v_ak_r);
free(v_bk);
}
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