/**********************************************************************
* TBLOB::bounding_box()
*
* Compute the bounding_box of a compound blob, defined to be the
* bounding box of the union of all top-level outlines in the blob.
**********************************************************************/
TBOX TBLOB::bounding_box() const {
if (outlines == nullptr) return TBOX(0, 0, 0, 0);
TESSLINE* outline = outlines;
TBOX box = outline->bounding_box();
for (outline = outline->next; outline != nullptr; outline = outline->next) {
box += outline->bounding_box();
}
return box;
}
float Tesseract::blob_noise_score(TBLOB *blob) {
TBOX box; // BB of outline
inT16 outline_count = 0;
inT16 max_dimension;
inT16 largest_outline_dimension = 0;
for (TESSLINE* ol = blob->outlines; ol != NULL; ol= ol->next) {
outline_count++;
box = ol->bounding_box();
if (box.height() > box.width()) {
max_dimension = box.height();
} else {
max_dimension = box.width();
}
if (largest_outline_dimension < max_dimension)
largest_outline_dimension = max_dimension;
}
if (outline_count > 5) {
// penalise LOTS of blobs
largest_outline_dimension *= 2;
}
box = blob->bounding_box();
if (box.bottom() > kBlnBaselineOffset * 4 ||
box.top() < kBlnBaselineOffset / 2) {
// Lax blob is if high or low
largest_outline_dimension /= 2;
}
return largest_outline_dimension;
}