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Estimate gridsize better. Fixes #112

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This commit is contained in:
Jaap Haitsma 2021-08-25 14:40:31 -04:00
parent 891550cd82
commit 064ebd5b87
1 changed files with 11 additions and 7 deletions
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18
lib/identify.c
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@ -648,9 +648,11 @@ static void find_leftmost_to_line(void *user_data, int y, int left, int right)
}
}
static double distance(struct quirc_point a, struct quirc_point b)
static double length(struct quirc_point a, struct quirc_point b)
{
return sqrt((a.x - b.x)*(a.x - b.x) + (a.y - b.y)*(a.y - b.y));
double x = fabs(a.x - b.x) + 1;
double y = fabs(a.y - b.y) + 1;
return sqrt(x * x + y * y);
}
/* Estimate grid size by determing distance between capstones
*/
@ -662,17 +664,19 @@ static void measure_grid_size(struct quirc *q, int index)
struct quirc_capstone *b = &(q->capstones[qr->caps[1]]);
struct quirc_capstone *c = &(q->capstones[qr->caps[2]]);
double ab = distance(b->corners[0], a->corners[3]);
double capstone_ab_size = (distance(b->corners[0], b->corners[3]) + distance(a->corners[0], a->corners[3]))/2.0;
double ab = length(b->corners[0], a->corners[3]);
double capstone_ab_size = (length(b->corners[0], b->corners[3]) + length(a->corners[0], a->corners[3]))/2.0;
double ver_grid = 7.0 * ab / capstone_ab_size;
double bc = distance(b->corners[0], c->corners[1]);
double capstone_bc_size = (distance(b->corners[0], b->corners[1]) + distance(c->corners[0], c->corners[1]))/2.0;
double bc = length(b->corners[0], c->corners[1]);
double capstone_bc_size = (length(b->corners[0], b->corners[1]) + length(c->corners[0], c->corners[1]))/2.0;
double hor_grid = 7.0 * bc / capstone_bc_size;
double grid_size_estimate = (ver_grid + hor_grid) / 2;
int ver = (int)((grid_size_estimate - 17.0 + 2.0) / 4.0);
qr->grid_size = 4*((int)(grid_size_estimate - 17.0 + 2.0) / 4) + 17;
qr->grid_size = 4*ver + 17;
}
/* Read a cell from a grid using the currently set perspective