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finder.c
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finder.c
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#include <stdio.h>
unsigned w, h;
unsigned char f[4000][4000];
unsigned runs[4000];
unsigned iabs(int a)
{
if (a < 0)
return -a;
return a;
}
#if 0
int despeckle(int max)
{
int x, y;
for (x = 1; x < max - 1; x++) {
if (runs[x] != 1)
continue;
if (runs[x - 1] == 1)
continue;
if (runs[x + 1] == 1)
continue;
runs[x - 1] += 1 + runs[x + 1];
max -= 2;
for (y = x; y < max - 1; y++)
runs[y] = runs[y + 2];
x--;
}
return max;
}
#endif
int isfinder(int x)
{
int a, b, c, d, e, m;
a = runs[x];
e = runs[x + 4];
if (iabs(a - e) > (a + e) / 4)
return 0;
b = runs[x + 1];
d = runs[x + 3];
if (iabs(b - d) > (b + d) / 4)
return 0;
c = runs[x + 2];
m = a + e + (b + d) / 2;
if (iabs(c - m) > (c + m) / 4)
return 0;
#if 0
m = runs[x - 1] + runs[x + 5]; // 4 module border
if (m < c + b)
return 2;
#endif
return 1;
}
void readimage()
{
char buf[512];
unsigned x, y;
int cx;
scanf("%2s", buf);
scanf("%u %u", &w, &h);
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
for (;;) {
cx = getchar();
if (cx < 0)
break;
if (cx == '1') {
f[y][x] = 1;
break;
}
if (cx == '0') {
f[y][x] = 0;
break;
}
}
}
}
void horizontalruns()
{
unsigned x, y;
unsigned r, b, i, m;
// horizontal runs
for (y = 0; y < h; y++) {
b = 0, r = 0, i = 0;
runs[i] = 0;
for (x = 0; x < w; x++) {
if ((1 & f[y][x]) == b) {
r++;
continue;
}
b = 1 & f[y][x];
runs[i++] = r;
runs[i] = 0;
r = 1;
}
runs[i++] = r; // last
runs[i++] = 1; // edge
if (i < 6)
continue;
#if 0
i = despeckle(i);
if (i < 6)
continue;
#endif
r = 0;
for (x = 1; x < i - 4; x += 2) {
r += runs[x] + runs[x - 1];
if (!isfinder(x))
continue;
m = runs[x + 2];
for (b = 0; b < m; b++)
f[y][r + runs[x + 1] + b] |= 2;
}
}
}
void verticalruns()
{
unsigned x, y;
unsigned r, b, i, m;
// vertical runs
for (y = 0; y < w; y++) {
b = 0, r = 0, i = 0;
runs[i] = 0;
for (x = 0; x < h; x++) {
if ((1 & f[x][y]) == b) {
r++;
continue;
}
b = 1 & f[x][y];
runs[i++] = r;
runs[i] = 0;
r = 1;
}
runs[i++] = r;
runs[i++] = 1;
if (i < 6)
continue;
#if 0
i = despeckle(i);
if (i < 6)
continue;
#endif
r = 0;
for (x = 1; x < i - 4; x += 2) {
r += runs[x] + runs[x - 1];
if (!isfinder(x))
continue;
m = runs[x + 2];
for (b = 0; b < m; b++)
f[r + runs[x + 1] + b][y] |= 4;
}
}
}
void lrdilate()
{
unsigned x, y, b, c;
for (y = 0; y < h; y++)
for (x = 0; x < w - 1; x++) {
if (y > 0 && f[y - 1][x] == 7)
continue;
if (f[y][x] == 7 && f[y][x + 1] & 1) {
b = 0;
c = 0;
// find height and adjacent black
while (f[y + b][x] == 7 && y + b < h) {
if (f[y + b][x + 1] & 1)
c++;
b++;
}
// black adjacent? - despeckle
if (c < b)
continue;
for (c = 0; c < b; c++)
f[y + c][x + 1] |= 6;
}
}
}
void rldilate()
{
unsigned x, y, b, c;
for (y = 0; y < h; y++)
for (x = w; x > 1; x--) {
if (y > 0 && f[y - 1][x] == 7)
continue;
if (f[y][x] == 7 && f[y][x - 1] & 1) {
b = 0;
c = 0;
// find height and adjacent black
while (f[y + b][x] == 7 && y + b < h) {
if (f[y + b][x - 1] & 1)
c++;
b++;
}
// black adjacent? - despeckle
if (c < b)
continue;
for (c = 0; c < b; c++)
f[y + c][x - 1] |= 6;
}
}
}
void tbdilate()
{
unsigned x, y, b, c;
for (y = 0; y < h - 1; y++)
for (x = 0; x < w; x++) {
if (x > 0 && f[y][x - 1] == 7)
continue;
if (f[y][x] == 7 && f[y + 1][x] & 1) {
b = 0;
c = 0;
// find height and adjacent black
while (f[y][x + b] == 7 && x + b < w) {
if (f[y + 1][x + b] & 1)
c++;
b++;
}
// black adjacent? - despeckle
if (c < b)
continue;
for (c = 0; c < b; c++)
f[y + 1][x + c] |= 6;
}
}
}
void btdilate()
{
unsigned x, y, b, c;
for (y = h; y > 1; y--)
for (x = 0; x < w; x++) {
if (x > 0 && f[y][x - 1] == 7)
continue;
if (f[y][x] == 7 && f[y - 1][x] & 1) {
b = 0;
c = 0;
// find height and adjacent black
while (f[y][x + b] == 7 && x + b < w) {
if (f[y - 1][x + b] & 1)
c++;
b++;
}
// black adjacent? - despeckle
if (c < b)
continue;
for (c = 0; c < b; c++)
f[y - 1][x + c] |= 6;
}
}
}
int main()
{
readimage();
horizontalruns();
verticalruns();
lrdilate();
tbdilate();
rldilate();
btdilate();
unsigned x, y;
printf("P2\n%u %u\n255\n", w, h);
for (y = 0; y < h; y++)
for (x = 0; x < w; x++) {
#if 0
printf("%d ", f[y][x]);
continue;
#endif
if (f[y][x] == 7)
printf("%d ", 255);
else
#if 0
printf("%d ", (7 & f[y][x]) << 4);
#else
printf("%d ", 128 - ((1 & f[y][x]) << 6));
#endif
}
}