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Add API to access minutiae

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This commit is contained in:
Daniel Drake
2007-11-19 00:27:27 +00:00
parent fa742a2142
commit 887e0e6acf
3 changed files with 65 additions and 16 deletions
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48
libfprint/img.c
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@@ -398,8 +398,10 @@ API_EXPORTED struct fp_img *fp_img_binarize(struct fp_img *img)
int r = fpi_img_detect_minutiae(img);
if (r < 0)
return NULL;
if (!img->binarized)
if (!img->binarized) {
fp_err("no minutiae after successful detection?");
return NULL;
}
}
ret = fpi_img_new(imgsize);
@@ -410,3 +412,47 @@ API_EXPORTED struct fp_img *fp_img_binarize(struct fp_img *img)
return ret;
}
/** \ingroup img
* Get a list of minutiae detected in an image. A minutia point is a feature
* detected on a fingerprint, typically where ridges end or split.
* libfprint's image processing code relies upon comparing sets of minutiae,
* so accurate placement of minutia points is critical for good imaging
* performance.
*
* The image must have been \ref img_std "standardized" otherwise this function
* will fail.
*
* You cannot pass a binarized image to this function. Instead, pass the
* original image.
*
* Returns a list of pointers to minutiae, where the list is of length
* indicated in the nr_minutiae output parameter. The returned list is only
* valid while the parent image has not been freed, and the minutiae data
* must not be modified or freed.
*
* \param img a standardized image
* \param nr_minutiae an output location to store minutiae list length
* \returns a list of minutiae points. Must not be modified or freed.
*/
API_EXPORTED struct fp_minutia **fp_img_get_minutiae(struct fp_img *img,
int *nr_minutiae)
{
if (img->flags & FP_IMG_BINARIZED_FORM) {
fp_err("image is binarized");
return NULL;
}
if (!img->minutiae) {
int r = fpi_img_detect_minutiae(img);
if (r < 0)
return NULL;
if (!img->minutiae) {
fp_err("no minutiae after successful detection?");
return NULL;
}
}
*nr_minutiae = img->minutiae->num;
return img->minutiae->list;
}