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nbis: re-add step to remove perimeter points

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This step helps to drop false minutiae for short sensors and
it was accidentally dropped during NBIS update. Re-add this step
and add a patch to update script to ensure that it's not dropped
during next update.

Fixes: 9fb789dc78 ("nbis: Update to NBIS 5.0.0")
This commit is contained in:
Vasily Khoruzhick 2020-06-03 18:26:40 -07:00
parent 8626c64831
commit 297236b51a
5 changed files with 405 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
libfprint/nbis/include/lfs.h
View file

@ -260,6 +260,8 @@ typedef struct g_lfsparms{
int pores_steps_bwd;
double pores_min_dist2;
double pores_max_ratio;
int remove_perimeter_pts;
int min_pp_distance;
/* Ridge Counting Controls */
int max_nbrs;
@ -609,6 +611,9 @@ typedef struct g_lfsparms{
/* contour points to be considered a pore. */
#define PORES_MAX_RATIO 2.25
/* Points which are closer than this distance to scan perimeter will be removed */
#define PERIMETER_PTS_DISTANCE 10
/***** RIDGE COUNTING CONSTANTS *****/
@ -1123,6 +1128,9 @@ extern int remove_or_adjust_side_minutiae(MINUTIAE *, unsigned char *,
extern int remove_or_adjust_side_minutiae_V2(MINUTIAE *,
unsigned char *, const int, const int,
int *, const int, const int, const LFSPARMS *);
extern int remove_perimeter_pts(MINUTIAE *minutiae,
unsigned char *bdata, const int iw, const int ih,
const LFSPARMS *lfsparms);
/* results.c */
extern int write_text_results(char *, const int, const int, const int,

4
libfprint/nbis/mindtct/globals.c
View file

@ -150,6 +150,8 @@ LFSPARMS g_lfsparms = {
PORES_STEPS_BWD,
PORES_MIN_DIST2,
PORES_MAX_RATIO,
FALSE, /* not removing perimeter points by default */
PERIMETER_PTS_DISTANCE,
/* Ridge Counting Controls */
MAX_NBRS,
@ -234,6 +236,8 @@ LFSPARMS g_lfsparms_V2 = {
PORES_STEPS_BWD,
PORES_MIN_DIST2,
PORES_MAX_RATIO,
FALSE, /* not removing perimeter points by default */
PERIMETER_PTS_DISTANCE,
/* Ridge Counting Controls */
MAX_NBRS,

158
libfprint/nbis/mindtct/remove.c
View file

@ -195,6 +195,11 @@ int remove_false_minutia_V2(MINUTIAE *minutiae,
return(ret);
}
/* 11. Remove minutiae on image edge */
if((ret = remove_perimeter_pts(minutiae, bdata, iw, ih, lfsparms))) {
return (ret);
}
return(0);
}
@ -1329,6 +1334,159 @@ int remove_pointing_invblock_V2(MINUTIAE *minutiae,
return(0);
}
static void mark_minutiae_in_range(MINUTIAE *minutiae, int *to_remove, int x, int y,
const LFSPARMS *lfsparms)
{
int i, dist;
for (i = 0; i < minutiae->num; i++) {
if (to_remove[i])
continue;
dist = (int)sqrt((x - minutiae->list[i]->x) * (x - minutiae->list[i]->x) +
(y - minutiae->list[i]->y) * (y - minutiae->list[i]->y));
if (dist < lfsparms->min_pp_distance) {
to_remove[i] = 1;
}
}
}
/*************************************************************************
**************************************************************************
#cat: remove_perimeter_pts - Takes a list of true and false minutiae and
#cat: attempts to detect and remove those false minutiae that
#cat: belong to image edge
Input:
minutiae - list of true and false minutiae
bdata - binary image data (0==while & 1==black)
iw - width (in pixels) of image
ih - height (in pixels) of image
lfsparms - parameters and thresholds for controlling LFS
Output:
minutiae - list of pruned minutiae
Return Code:
Zero - successful completion
Negative - system error
**************************************************************************/
int remove_perimeter_pts(MINUTIAE *minutiae,
unsigned char *bdata, const int iw, const int ih,
const LFSPARMS *lfsparms)
{
int i, j, ret, *to_remove;
int *left, *left_up, *left_down;
int *right, *right_up, *right_down;
int removed = 0;
int left_min, right_max;
if (!lfsparms->remove_perimeter_pts)
return(0);
to_remove = calloc(minutiae->num, sizeof(int));
left = calloc(ih, sizeof(int));
left_up = calloc(ih, sizeof(int));
left_down = calloc(ih, sizeof(int));
right = calloc(ih, sizeof(int));
right_up = calloc(ih, sizeof(int));
right_down = calloc(ih, sizeof(int));
/* Pass downwards */
left_min = iw - 1;
right_max = 0;
for (i = 0; i < ih; i++) {
for (j = 0; j < left_min; j++) {
if ((bdata[i * iw + j] != 0)) {
left_min = j;
break;
}
}
if (left_min == (iw - 1))
left_down[i] = -1;
else
left_down[i] = left_min;
for (j = iw - 1; j >= right_max; j--) {
if ((bdata[i * iw + j] != 0)) {
right_max = j;
break;
}
}
if (right_max == 0)
right_down[i] = -1;
else
right_down[i] = right_max;
}
/* Pass upwards */
left_min = iw - 1;
right_max = 0;
for (i = ih - 1; i >= 0; i--) {
for (j = 0; j < left_min; j++) {
if ((bdata[i * iw + j] != 0)) {
left_min = j;
break;
}
}
if (left_min == (iw - 1))
left_up[i] = -1;
else
left_up[i] = left_min;
for (j = iw - 1; j >= right_max; j--) {
if ((bdata[i * iw + j] != 0)) {
right_max = j;
break;
}
}
if (right_max == 0)
right_up[i] = -1;
else
right_up[i] = right_max;
}
/* Merge */
left_min = left_down[ih - 1];
right_max = right_down[ih - 1];
for (i = 0; i < ih; i++) {
if (left_down[i] != left_min)
left[i] = left_down[i];
else
left[i] = left_up[i];
if (right_down[i] != right_max)
right[i] = right_down[i];
else
right[i] = right_up[i];
}
free(left_up);
free(left_down);
free(right_up);
free(right_down);
/* Mark minitiae close to the edge */
for (i = 0; i < ih; i++) {
if (left[i] != -1)
mark_minutiae_in_range(minutiae, to_remove, left[i], i, lfsparms);
if (right[i] != -1)
mark_minutiae_in_range(minutiae, to_remove, right[i], i, lfsparms);
}
free(left);
free(right);
for (i = minutiae->num - 1; i >= 0; i--) {
/* If the current minutia index is flagged for removal ... */
if (to_remove[i]){
removed ++;
/* Remove the minutia from the minutiae list. */
if((ret = remove_minutia(i, minutiae))){
free(to_remove);
return(ret);
}
}
}
free(to_remove);
return (0);
}
/*************************************************************************
**************************************************************************
#cat: remove_overlaps - Takes a list of true and false minutiae and

231
libfprint/nbis/remove-perimeter-pts.patch Normal file
View file

@ -0,0 +1,231 @@
diff --git nbis/include/lfs.h nbis/include/lfs.h
index f4f38d7..8b12e73 100644
--- nbis/include/lfs.h
+++ nbis/include/lfs.h
@@ -260,6 +260,8 @@ typedef struct g_lfsparms{
int pores_steps_bwd;
double pores_min_dist2;
double pores_max_ratio;
+ int remove_perimeter_pts;
+ int min_pp_distance;
/* Ridge Counting Controls */
int max_nbrs;
@@ -609,6 +611,9 @@ typedef struct g_lfsparms{
/* contour points to be considered a pore. */
#define PORES_MAX_RATIO 2.25
+/* Points which are closer than this distance to scan perimeter will be removed */
+#define PERIMETER_PTS_DISTANCE 10
+
/***** RIDGE COUNTING CONSTANTS *****/
@@ -1123,6 +1128,9 @@ extern int remove_or_adjust_side_minutiae(MINUTIAE *, unsigned char *,
extern int remove_or_adjust_side_minutiae_V2(MINUTIAE *,
unsigned char *, const int, const int,
int *, const int, const int, const LFSPARMS *);
+extern int remove_perimeter_pts(MINUTIAE *minutiae,
+ unsigned char *bdata, const int iw, const int ih,
+ const LFSPARMS *lfsparms);
/* results.c */
extern int write_text_results(char *, const int, const int, const int,
diff --git nbis/mindtct/globals.c nbis/mindtct/globals.c
index da10c15..79bc583 100644
--- nbis/mindtct/globals.c
+++ nbis/mindtct/globals.c
@@ -150,6 +150,8 @@ LFSPARMS g_lfsparms = {
PORES_STEPS_BWD,
PORES_MIN_DIST2,
PORES_MAX_RATIO,
+ FALSE, /* not removing perimeter points by default */
+ PERIMETER_PTS_DISTANCE,
/* Ridge Counting Controls */
MAX_NBRS,
@@ -234,6 +236,8 @@ LFSPARMS g_lfsparms_V2 = {
PORES_STEPS_BWD,
PORES_MIN_DIST2,
PORES_MAX_RATIO,
+ FALSE, /* not removing perimeter points by default */
+ PERIMETER_PTS_DISTANCE,
/* Ridge Counting Controls */
MAX_NBRS,
diff --git nbis/mindtct/remove.c nbis/mindtct/remove.c
index af5ab7d..7311f1c 100644
--- nbis/mindtct/remove.c
+++ nbis/mindtct/remove.c
@@ -195,6 +195,11 @@ int remove_false_minutia_V2(MINUTIAE *minutiae,
return(ret);
}
+ /* 11. Remove minutiae on image edge */
+ if((ret = remove_perimeter_pts(minutiae, bdata, iw, ih, lfsparms))) {
+ return (ret);
+ }
+
return(0);
}
@@ -1329,6 +1334,159 @@ int remove_pointing_invblock_V2(MINUTIAE *minutiae,
return(0);
}
+static void mark_minutiae_in_range(MINUTIAE *minutiae, int *to_remove, int x, int y,
+ const LFSPARMS *lfsparms)
+{
+ int i, dist;
+ for (i = 0; i < minutiae->num; i++) {
+ if (to_remove[i])
+ continue;
+ dist = (int)sqrt((x - minutiae->list[i]->x) * (x - minutiae->list[i]->x) +
+ (y - minutiae->list[i]->y) * (y - minutiae->list[i]->y));
+ if (dist < lfsparms->min_pp_distance) {
+ to_remove[i] = 1;
+ }
+ }
+}
+
+/*************************************************************************
+**************************************************************************
+#cat: remove_perimeter_pts - Takes a list of true and false minutiae and
+#cat: attempts to detect and remove those false minutiae that
+#cat: belong to image edge
+
+ Input:
+ minutiae - list of true and false minutiae
+ bdata - binary image data (0==while & 1==black)
+ iw - width (in pixels) of image
+ ih - height (in pixels) of image
+ lfsparms - parameters and thresholds for controlling LFS
+ Output:
+ minutiae - list of pruned minutiae
+ Return Code:
+ Zero - successful completion
+ Negative - system error
+**************************************************************************/
+int remove_perimeter_pts(MINUTIAE *minutiae,
+ unsigned char *bdata, const int iw, const int ih,
+ const LFSPARMS *lfsparms)
+{
+ int i, j, ret, *to_remove;
+ int *left, *left_up, *left_down;
+ int *right, *right_up, *right_down;
+ int removed = 0;
+ int left_min, right_max;
+
+ if (!lfsparms->remove_perimeter_pts)
+ return(0);
+
+ to_remove = calloc(minutiae->num, sizeof(int));
+ left = calloc(ih, sizeof(int));
+ left_up = calloc(ih, sizeof(int));
+ left_down = calloc(ih, sizeof(int));
+ right = calloc(ih, sizeof(int));
+ right_up = calloc(ih, sizeof(int));
+ right_down = calloc(ih, sizeof(int));
+
+ /* Pass downwards */
+ left_min = iw - 1;
+ right_max = 0;
+ for (i = 0; i < ih; i++) {
+ for (j = 0; j < left_min; j++) {
+ if ((bdata[i * iw + j] != 0)) {
+ left_min = j;
+ break;
+ }
+ }
+ if (left_min == (iw - 1))
+ left_down[i] = -1;
+ else
+ left_down[i] = left_min;
+ for (j = iw - 1; j >= right_max; j--) {
+ if ((bdata[i * iw + j] != 0)) {
+ right_max = j;
+ break;
+ }
+ }
+ if (right_max == 0)
+ right_down[i] = -1;
+ else
+ right_down[i] = right_max;
+ }
+
+ /* Pass upwards */
+ left_min = iw - 1;
+ right_max = 0;
+ for (i = ih - 1; i >= 0; i--) {
+ for (j = 0; j < left_min; j++) {
+ if ((bdata[i * iw + j] != 0)) {
+ left_min = j;
+ break;
+ }
+ }
+ if (left_min == (iw - 1))
+ left_up[i] = -1;
+ else
+ left_up[i] = left_min;
+ for (j = iw - 1; j >= right_max; j--) {
+ if ((bdata[i * iw + j] != 0)) {
+ right_max = j;
+ break;
+ }
+ }
+ if (right_max == 0)
+ right_up[i] = -1;
+ else
+ right_up[i] = right_max;
+ }
+
+ /* Merge */
+ left_min = left_down[ih - 1];
+ right_max = right_down[ih - 1];
+ for (i = 0; i < ih; i++) {
+ if (left_down[i] != left_min)
+ left[i] = left_down[i];
+ else
+ left[i] = left_up[i];
+
+ if (right_down[i] != right_max)
+ right[i] = right_down[i];
+ else
+ right[i] = right_up[i];
+ }
+ free(left_up);
+ free(left_down);
+ free(right_up);
+ free(right_down);
+
+ /* Mark minitiae close to the edge */
+ for (i = 0; i < ih; i++) {
+ if (left[i] != -1)
+ mark_minutiae_in_range(minutiae, to_remove, left[i], i, lfsparms);
+ if (right[i] != -1)
+ mark_minutiae_in_range(minutiae, to_remove, right[i], i, lfsparms);
+ }
+
+ free(left);
+ free(right);
+
+ for (i = minutiae->num - 1; i >= 0; i--) {
+ /* If the current minutia index is flagged for removal ... */
+ if (to_remove[i]){
+ removed ++;
+ /* Remove the minutia from the minutiae list. */
+ if((ret = remove_minutia(i, minutiae))){
+ free(to_remove);
+ return(ret);
+ }
+ }
+ }
+
+ free(to_remove);
+
+ return (0);
+}
+
/*************************************************************************
**************************************************************************
#cat: remove_overlaps - Takes a list of true and false minutiae and

3
libfprint/nbis/update-from-nbis.sh
View file

@ -195,3 +195,6 @@ patch -p0 < glib-mem-warning.patch
# Also fix some scan-build warnings, mostly by adding assertions
patch -p0 < fix-scan-build-reports.patch
# Add pass to remove perimeter points
patch -p0 < remove-perimeter-pts.patch