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despeckle.h
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despeckle.h
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/*
https://github.com/heptagonhust/bicubic-image-resize/issues/9
*/
#ifndef DESPECKLE_H_
#define DESPECKLE_H_
#include <stdbool.h>
#include <math.h>
#define DESPECKLE_VERSION "1.0"
#ifdef DESPECKLE_STATIC
#define DESPECKLEAPI static
#else
#define DESPECKLEAPI extern
#endif
#ifdef __cplusplus
extern "C" {
#endif
DESPECKLEAPI void Despeckle (unsigned char *src, int height, int width, int channels, int radius, float coef, unsigned char *res);
#ifdef __cplusplus
}
#endif
#ifdef DESPECKLE_IMPLEMENTATION
typedef struct
{
unsigned char c[4];
}
pixel;
typedef struct
{
float c[4];
}
pixelf;
static pixel PixelCopy(pixel p, int channels)
{
int d;
pixel r;
for (d = 0; d < channels; d++)
{
r.c[d] = p.c[d];
}
return r;
}
static float PixelDist (pixel pA, pixel pB, int channels)
{
int d;
float dist = 0.0f;
for(d = 0; d < channels; d++)
{
dist += (pB.c[d] - pA.c[d]) * (pB.c[d] - pA.c[d]);
}
return dist;
}
static float PixelCross (pixel pA, pixel pB,pixel pC, pixel pD, int channels)
{
int d;
float cross = 0.0f;
for(d = 0; d < channels; d++)
{
cross += (pB.c[d] - pA.c[d]) * (pD.c[d] - pC.c[d]);
}
return cross;
}
static pixel PixelMean9 (pixel pA, pixel pB,pixel pC, pixel pD, pixel pE, pixel pF, pixel pG, pixel pH, pixel pI, int channels)
{
int d, sum;
pixel mean;
for(d = 0; d < channels; d++)
{
sum = pA.c[d] + pB.c[d] + pC.c[d] + pD.c[d] + pE.c[d] + pF.c[d] + pG.c[d] + pH.c[d] + pI.c[d];
sum += 4;
sum /= 9;
mean.c[d] = sum;
}
return mean;
}
static pixelf PixelGrad (pixel p1, pixel p2, pixel p3, pixel p4, int channels)
{
int d;
pixelf pR;
for(d = 0; d < channels; d++)
{
pR.c[d] = p1.c[d];
pR.c[d] += p2.c[d];
pR.c[d] -= p3.c[d];
pR.c[d] -= p4.c[d];
}
return pR;
}
static pixelf PixelDelta (pixelf px, pixelf py, pixelf pz, float dx, float dy, float dz, int channels)
{
int d;
pixelf pR;
for(d = 0; d < channels; d++)
{
pR.c[d] = (py.c[d] * dx + px.c[d] * dy - 0.5f * pz.c[d] * dz);
}
return pR;
}
static pixel PixelAlign (pixel p0, pixel pM, pixelf pd, float coef, int channels)
{
int d;
float sum;
pixel pR;
for(d = 0; d < channels; d++)
{
sum = p0.c[d];
if ((pM.c[d] > 128 && pd.c[d] > 0.0f) || (pM.c[d] < 128 && pd.c[d] < 0.0f))
{
sum += (coef * pd.c[d]);
sum += 0.5f;
sum = (sum < 0.0f) ? 0.0f : (sum < 255.0f) ? sum : 255.0f;
}
pR.c[d] = (int) sum;
}
return pR;
}
static pixel PixelGet (unsigned char *image, int height, int width, int channels, int y, int x)
{
int d;
pixel p;
size_t k;
y = (y < 0) ? 0 : (y < height) ? y : (height - 1);
x = (x < 0) ? 0 : (x < width) ? x : (width - 1);
k = ((width * y) + x) * channels;
for (d = 0; d < channels; d++)
{
p.c[d] = image[k + d];
}
return p;
}
static void PixelSet (unsigned char *image, int height, int width, int channels, int y, int x, pixel p)
{
int d;
size_t k;
y = (y < 0) ? 0 : (y < height) ? y : (height - 1);
x = (x < 0) ? 0 : (x < width) ? x : (width - 1);
k = ((width * y) + x) * channels;
for (d = 0; d < channels; d++)
{
image[k + d] = p.c[d];
}
}
DESPECKLEAPI void Despeckle (unsigned char *src, int height, int width, int channels, int radius, float coef, unsigned char *res)
{
int j, y, x;
pixel pA, pB, pC, pD, pE, pF, pG, pH, pI, pM, pR;
float dIy, dIx, dIxy, dI;
pixelf gy, gx, gxy, gd2;
for (j = 0; j < radius; j++)
{
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
pA = PixelGet(src, height, width, channels, y - 1, x - 1);
pB = PixelGet(src, height, width, channels, y - 1, x);
pC = PixelGet(src, height, width, channels, y - 1, x + 1);
pD = PixelGet(src, height, width, channels, y, x - 1);
pE = PixelGet(src, height, width, channels, y, x);
pF = PixelGet(src, height, width, channels, y, x + 1);
pG = PixelGet(src, height, width, channels, y + 1, x - 1);
pH = PixelGet(src, height, width, channels, y + 1, x);
pI = PixelGet(src, height, width, channels, y + 1, x + 1);
dIy = PixelDist(pH, pB, channels);
dIx = PixelDist(pF, pD, channels);
dIxy = PixelCross(pB, pH, pD, pF, channels);
dI = dIy + dIx;
pM = PixelMean9(pA, pB, pC, pD, pE, pF, pG, pH, pI, channels);
if (dI > 0.0f)
{
dIx /= dI;
dIy /= dI;
dIxy /= dI;
gy = PixelGrad(pB, pH, pE, pE, channels);
gx = PixelGrad(pD, pF, pE, pE, channels);
gxy = PixelGrad(pC, pG, pA, pI, channels);
gd2 = PixelDelta(gy, gx, gxy, dIx, dIy, dIxy, channels);
pR = PixelAlign(pE, pM, gd2, coef, channels);
}
else
{
pR = pM;
}
PixelSet(res, height, width, channels, y, x, pR);
}
}
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
pR = PixelGet(res, height, width, channels, y, x);
PixelSet(src, height, width, channels, y, x, pR);
}
}
}
}
#endif /* DESPECKLE_IMPLEMENTATION */
#endif /* DESPECKLE_H_ */