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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <math.h>
#include "filters.h"
int value(int r, int g, int b) {
return MAX(r, MAX(g, b));
}
int isRed(unsigned char *src, int p) {
int b = src[p + 2];
int g = src[p + 1];
int r = src[p];
int max = MAX(g, b);
return ((r * 100 / (max + 2) > 160) & (max < 80));
}
void findPossible(unsigned char *src, unsigned char *mask, int iw, int ih,
short *rect) {
int recX = rect[0], recY = rect[1], recW = rect[2], recH = rect[3];
int y, x;
for (y = 0; y < recH; y++) {
int sy = (recY + y) * iw;
for (x = 0; x < recW; x++) {
int p = (recX + x + sy) * 4;
int b = src[p + 2];
int g = src[p + 1];
int r = src[p];
mask[x + y * recW] = (
mask[x + y * recW] > 0 && (value(r, g, b) > 240) ? 1 : 0);
}
}
}
void findReds(unsigned char *src, unsigned char *mask, int iw, int ih,
short *rect) {
int recX = rect[0], recY = rect[1], recW = rect[2], recH = rect[3];
int y, x;
for (y = 0; y < recH; y++) {
int sy = (recY + y) * iw;
for (x = 0; x < recW; x++) {
int p = (recX + x + sy) * 4;
mask[x + y * recW] = ((isRed(src, p)) ? 1 : 0);
}
}
}
void dialateMaskIfRed(unsigned char *src, int iw, int ih, unsigned char *mask,
unsigned char *out, short *rect) {
int recX = rect[0], recY = rect[1], recW = rect[2], recH = rect[3];
int y, x;
for (y = 1; y < recH - 1; y++) {
int row = recW * y;
int sy = (recY + y) * iw;
for (x = 1; x < recW - 1; x++) {
int p = (recX + x + sy) * 4;
char b = (mask[row + x] | mask[row + x + 1] | mask[row + x - 1]
| mask[row + x - recW] | mask[row + x + recW]);
if (b != 0 && isRed(src, p))
out[row + x] = 1;
else
out[row + x] = mask[row + x];
}
}
}
void dialateMask(unsigned char *mask, unsigned char *out, int mw, int mh) {
int y, x;
for (y = 1; y < mh - 1; y++) {
int row = mw * y;
for (x = 1; x < mw - 1; x++) {
out[row + x] = (mask[row + x] | mask[row + x + 1]
| mask[row + x - 1] | mask[row + x - mw]
| mask[row + x + mw]);
}
}
}
void stuff(int r, int g, int b, unsigned char *img, int off) {
img[off + 2] = b;
img[off + 1] = g;
img[off] = r;
}
void filterRedEye(unsigned char *src, unsigned char *dest, int iw, int ih, short *rect) {
int recX = rect[0], recY = rect[1], recW = rect[2], recH = rect[3];
unsigned char *mask1 = (unsigned char *) malloc(recW * recH);
unsigned char *mask2 = (unsigned char *)malloc(recW*recH);
int QUE_LEN = 100;
int y, x, i;
rect[0] = MAX(rect[0],0);
rect[1] = MAX(rect[1],0);
rect[2] = MIN(rect[2]+rect[0],iw)-rect[0];
rect[3] = MIN(rect[3]+rect[1],ih)-rect[1];
findReds(src, mask2, iw, ih, rect);
dialateMask(mask2, mask1, recW, recH);
dialateMask(mask1, mask2, recW, recH);
dialateMask(mask2, mask1, recW, recH);
dialateMask(mask1, mask2, recW, recH);
findPossible(src, mask2, iw, ih, rect);
dialateMask(mask2, mask1, recW, recH);
for (i = 0; i < 12; i++) {
dialateMaskIfRed(src, iw, ih, mask1, mask2, rect);
dialateMaskIfRed(src, iw, ih, mask2, mask1, rect);
}
dialateMask(mask1, mask2, recW, recH);
dialateMask(mask2, mask1, recW, recH);
for (y = 3; y < recH-3; y++) {
int sy = (recY + y) * iw;
for (x = 3; x < recW-3; x++) {
int p = (recX + x + sy) * 4;
int b = src[p + 2];
int g = src[p + 1];
int r = src[p];
if (mask1[x + y * recW] != 0) {
int m = MAX(g,b);
float rr = (r - m) / (float) m;
if (rr > .7f && g < 60 && b < 60) {
dest[p + 2] = (0);
dest[p + 1] = (0);
dest[p] = (0);
} else {
if (mask2[x + y * recW] != 0) {
stuff(r / 2, g / 2, b / 2, dest, p);
} else
stuff((2 * r) / 3, (2 * g) / 3, (2 * b) / 3, dest, p);
}
} else
stuff(r, g, b, dest, p);
//dest[p + 2] = dest[p + 1] =dest[p]=src[p];
}
}
free(mask1);
free(mask2);
}
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