depau/libfprint
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

Allow drivers to specify custom bz3 match threshold

Browse source 
aes4000 detects fewer minutiae and hence returns lower scores.
This commit is contained in:
Daniel Drake 2007-11-09 14:57:42 +00:00
parent e3451158e9
commit 71e4bb39ec
3 changed files with 12 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
libfprint/drivers/aes4000.c
View file

@ -220,6 +220,9 @@ struct fp_img_driver aes4000_driver = {
.img_width = 96,
.enlarge_factor = 3,
/* temporarily lowered until image quality improves */
.bz3_threshold = 9,
.init = dev_init,
.exit = dev_exit,
.capture = capture,

1
libfprint/fp_internal.h
View file

@ -127,6 +127,7 @@ struct fp_img_driver {
int img_width;
int img_height;
unsigned int enlarge_factor;
int bz3_threshold;
/* Device operations */
int (*init)(struct fp_img_dev *dev, unsigned long driver_data);

9
libfprint/imgdev.c
View file

@ -186,12 +186,16 @@ int img_dev_enroll(struct fp_dev *dev, gboolean initial, int stage,
return FP_ENROLL_COMPLETE;
}
#define BOZORTH3_DEFAULT_THRESHOLD 40
static int img_dev_verify(struct fp_dev *dev,
struct fp_print_data *enrolled_print)
{
struct fp_img_dev *imgdev = dev->priv;
struct fp_img_driver *imgdrv = fpi_driver_to_img_driver(dev->drv);
struct fp_img *img;
struct fp_print_data *print;
int match_score = imgdrv->bz3_threshold;
int r;
r = fpi_imgdev_capture(imgdev, 0, &img);
@ -209,11 +213,14 @@ static int img_dev_verify(struct fp_dev *dev,
return FP_VERIFY_RETRY;
}
if (match_score == 0)
match_score = BOZORTH3_DEFAULT_THRESHOLD;
r = fpi_img_compare_print_data(enrolled_print, print);
fp_print_data_free(print);
if (r < 0)
return r;
if (r >= 40)
if (r >= match_score)
return FP_VERIFY_MATCH;
else
return FP_VERIFY_NO_MATCH;