346 lines
12 KiB
C
346 lines
12 KiB
C
/*******************************************************************************
|
|
|
|
License:
|
|
This software was developed at the National Institute of Standards and
|
|
Technology (NIST) by employees of the Federal Government in the course
|
|
of their official duties. Pursuant to title 17 Section 105 of the
|
|
United States Code, this software is not subject to copyright protection
|
|
and is in the public domain. NIST assumes no responsibility whatsoever for
|
|
its use by other parties, and makes no guarantees, expressed or implied,
|
|
about its quality, reliability, or any other characteristic.
|
|
|
|
Disclaimer:
|
|
This software was developed to promote biometric standards and biometric
|
|
technology testing for the Federal Government in accordance with the USA
|
|
PATRIOT Act and the Enhanced Border Security and Visa Entry Reform Act.
|
|
Specific hardware and software products identified in this software were used
|
|
in order to perform the software development. In no case does such
|
|
identification imply recommendation or endorsement by the National Institute
|
|
of Standards and Technology, nor does it imply that the products and equipment
|
|
identified are necessarily the best available for the purpose.
|
|
|
|
*******************************************************************************/
|
|
|
|
/***********************************************************************
|
|
LIBRARY: LFS - NIST Latent Fingerprint System
|
|
|
|
FILE: DETECT.C
|
|
AUTHOR: Michael D. Garris
|
|
DATE: 08/16/1999
|
|
UPDATED: 10/04/1999 Version 2 by MDG
|
|
UPDATED: 03/16/2005 by MDG
|
|
|
|
Takes an 8-bit grayscale fingerpinrt image and detects minutiae
|
|
as part of the NIST Latent Fingerprint System (LFS).
|
|
|
|
***********************************************************************
|
|
ROUTINES:
|
|
lfs_detect_minutiae_V2()
|
|
|
|
***********************************************************************/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <lfs.h>
|
|
#include <log.h>
|
|
|
|
/*************************************************************************
|
|
#cat: lfs_detect_minutiae_V2 - Takes a grayscale fingerprint image (of
|
|
#cat: arbitrary size), and returns a set of image block maps,
|
|
#cat: a binarized image designating ridges from valleys,
|
|
#cat: and a list of minutiae (including position, reliability,
|
|
#cat: type, direction, neighbors, and ridge counts to neighbors).
|
|
#cat: The image maps include a ridge flow directional map,
|
|
#cat: a map of low contrast blocks, a map of low ridge flow blocks.
|
|
#cat: and a map of high-curvature blocks.
|
|
|
|
Input:
|
|
idata - input 8-bit grayscale fingerprint image data
|
|
iw - width (in pixels) of the image
|
|
ih - height (in pixels) of the image
|
|
lfsparms - parameters and thresholds for controlling LFS
|
|
|
|
Output:
|
|
ominutiae - resulting list of minutiae
|
|
odmap - resulting Direction Map
|
|
{invalid (-1) or valid ridge directions}
|
|
olcmap - resulting Low Contrast Map
|
|
{low contrast (TRUE), high contrast (FALSE)}
|
|
olfmap - resulting Low Ridge Flow Map
|
|
{low ridge flow (TRUE), high ridge flow (FALSE)}
|
|
ohcmap - resulting High Curvature Map
|
|
{high curvature (TRUE), low curvature (FALSE)}
|
|
omw - width (in blocks) of image maps
|
|
omh - height (in blocks) of image maps
|
|
obdata - resulting binarized image
|
|
{0 = black pixel (ridge) and 255 = white pixel (valley)}
|
|
obw - width (in pixels) of the binary image
|
|
obh - height (in pixels) of the binary image
|
|
Return Code:
|
|
Zero - successful completion
|
|
Negative - system error
|
|
**************************************************************************/
|
|
int lfs_detect_minutiae_V2(MINUTIAE **ominutiae,
|
|
int **odmap, int **olcmap, int **olfmap, int **ohcmap,
|
|
int *omw, int *omh,
|
|
unsigned char **obdata, int *obw, int *obh,
|
|
unsigned char *idata, const int iw, const int ih,
|
|
const LFSPARMS *lfsparms)
|
|
{
|
|
unsigned char *pdata, *bdata;
|
|
int pw, ph, bw, bh;
|
|
DIR2RAD *dir2rad;
|
|
DFTWAVES *dftwaves;
|
|
ROTGRIDS *dftgrids;
|
|
ROTGRIDS *dirbingrids;
|
|
int *direction_map, *low_contrast_map, *low_flow_map, *high_curve_map;
|
|
int mw, mh;
|
|
int ret, maxpad;
|
|
MINUTIAE *minutiae;
|
|
|
|
/******************/
|
|
/* INITIALIZATION */
|
|
/******************/
|
|
|
|
/* If LOG_REPORT defined, open log report file. */
|
|
if((ret = open_logfile()))
|
|
/* If system error, exit with error code. */
|
|
return(ret);
|
|
|
|
/* Determine the maximum amount of image padding required to support */
|
|
/* LFS processes. */
|
|
maxpad = get_max_padding_V2(lfsparms->windowsize, lfsparms->windowoffset,
|
|
lfsparms->dirbin_grid_w, lfsparms->dirbin_grid_h);
|
|
|
|
/* Initialize lookup table for converting integer directions */
|
|
/* to angles in radians. */
|
|
if((ret = init_dir2rad(&dir2rad, lfsparms->num_directions))){
|
|
/* Free memory allocated to this point. */
|
|
return(ret);
|
|
}
|
|
|
|
/* Initialize wave form lookup tables for DFT analyses. */
|
|
/* used for direction binarization. */
|
|
if((ret = init_dftwaves(&dftwaves, dft_coefs, lfsparms->num_dft_waves,
|
|
lfsparms->windowsize))){
|
|
/* Free memory allocated to this point. */
|
|
free_dir2rad(dir2rad);
|
|
return(ret);
|
|
}
|
|
|
|
/* Initialize lookup table for pixel offsets to rotated grids */
|
|
/* used for DFT analyses. */
|
|
if((ret = init_rotgrids(&dftgrids, iw, ih, maxpad,
|
|
lfsparms->start_dir_angle, lfsparms->num_directions,
|
|
lfsparms->windowsize, lfsparms->windowsize,
|
|
RELATIVE2ORIGIN))){
|
|
/* Free memory allocated to this point. */
|
|
free_dir2rad(dir2rad);
|
|
free_dftwaves(dftwaves);
|
|
return(ret);
|
|
}
|
|
|
|
/* Pad input image based on max padding. */
|
|
if(maxpad > 0){ /* May not need to pad at all */
|
|
if((ret = pad_uchar_image(&pdata, &pw, &ph, idata, iw, ih,
|
|
maxpad, lfsparms->pad_value))){
|
|
/* Free memory allocated to this point. */
|
|
free_dir2rad(dir2rad);
|
|
free_dftwaves(dftwaves);
|
|
free_rotgrids(dftgrids);
|
|
return(ret);
|
|
}
|
|
}
|
|
else{
|
|
/* If padding is unnecessary, then copy the input image. */
|
|
pdata = (unsigned char *)malloc(iw*ih);
|
|
if(pdata == (unsigned char *)NULL){
|
|
/* Free memory allocated to this point. */
|
|
free_dir2rad(dir2rad);
|
|
free_dftwaves(dftwaves);
|
|
free_rotgrids(dftgrids);
|
|
fprintf(stderr, "ERROR : lfs_detect_minutiae_V2 : malloc : pdata\n");
|
|
return(-580);
|
|
}
|
|
memcpy(pdata, idata, iw*ih);
|
|
pw = iw;
|
|
ph = ih;
|
|
}
|
|
|
|
/* Scale input image to 6 bits [0..63] */
|
|
/* !!! Would like to remove this dependency eventualy !!! */
|
|
/* But, the DFT computations will need to be changed, and */
|
|
/* could not get this work upon first attempt. Also, if not */
|
|
/* careful, I think accumulated power magnitudes may overflow */
|
|
/* doubles. */
|
|
bits_8to6(pdata, pw, ph);
|
|
|
|
print2log("\nINITIALIZATION AND PADDING DONE\n");
|
|
|
|
/******************/
|
|
/* MAPS */
|
|
/******************/
|
|
|
|
/* Generate block maps from the input image. */
|
|
if((ret = gen_image_maps(&direction_map, &low_contrast_map,
|
|
&low_flow_map, &high_curve_map, &mw, &mh,
|
|
pdata, pw, ph, dir2rad, dftwaves, dftgrids, lfsparms))){
|
|
/* Free memory allocated to this point. */
|
|
free_dir2rad(dir2rad);
|
|
free_dftwaves(dftwaves);
|
|
free_rotgrids(dftgrids);
|
|
free(pdata);
|
|
return(ret);
|
|
}
|
|
/* Deallocate working memories. */
|
|
free_dir2rad(dir2rad);
|
|
free_dftwaves(dftwaves);
|
|
free_rotgrids(dftgrids);
|
|
|
|
print2log("\nMAPS DONE\n");
|
|
|
|
/******************/
|
|
/* BINARIZARION */
|
|
/******************/
|
|
|
|
/* Initialize lookup table for pixel offsets to rotated grids */
|
|
/* used for directional binarization. */
|
|
if((ret = init_rotgrids(&dirbingrids, iw, ih, maxpad,
|
|
lfsparms->start_dir_angle, lfsparms->num_directions,
|
|
lfsparms->dirbin_grid_w, lfsparms->dirbin_grid_h,
|
|
RELATIVE2CENTER))){
|
|
/* Free memory allocated to this point. */
|
|
free(pdata);
|
|
free(direction_map);
|
|
free(low_contrast_map);
|
|
free(low_flow_map);
|
|
free(high_curve_map);
|
|
return(ret);
|
|
}
|
|
|
|
/* Binarize input image based on NMAP information. */
|
|
if((ret = binarize_V2(&bdata, &bw, &bh,
|
|
pdata, pw, ph, direction_map, mw, mh,
|
|
dirbingrids, lfsparms))){
|
|
/* Free memory allocated to this point. */
|
|
free(pdata);
|
|
free(direction_map);
|
|
free(low_contrast_map);
|
|
free(low_flow_map);
|
|
free(high_curve_map);
|
|
free_rotgrids(dirbingrids);
|
|
return(ret);
|
|
}
|
|
|
|
/* Deallocate working memory. */
|
|
free_rotgrids(dirbingrids);
|
|
|
|
/* Check dimension of binary image. If they are different from */
|
|
/* the input image, then ERROR. */
|
|
if((iw != bw) || (ih != bh)){
|
|
/* Free memory allocated to this point. */
|
|
free(pdata);
|
|
free(direction_map);
|
|
free(low_contrast_map);
|
|
free(low_flow_map);
|
|
free(high_curve_map);
|
|
free(bdata);
|
|
fprintf(stderr, "ERROR : lfs_detect_minutiae_V2 :");
|
|
fprintf(stderr,"binary image has bad dimensions : %d, %d\n",
|
|
bw, bh);
|
|
return(-581);
|
|
}
|
|
|
|
print2log("\nBINARIZATION DONE\n");
|
|
|
|
/******************/
|
|
/* DETECTION */
|
|
/******************/
|
|
|
|
/* Convert 8-bit grayscale binary image [0,255] to */
|
|
/* 8-bit binary image [0,1]. */
|
|
gray2bin(1, 1, 0, bdata, iw, ih);
|
|
|
|
/* Allocate initial list of minutia pointers. */
|
|
if((ret = alloc_minutiae(&minutiae, MAX_MINUTIAE))){
|
|
return(ret);
|
|
}
|
|
|
|
/* Detect the minutiae in the binarized image. */
|
|
if((ret = detect_minutiae_V2(minutiae, bdata, iw, ih,
|
|
direction_map, low_flow_map, high_curve_map,
|
|
mw, mh, lfsparms))){
|
|
/* Free memory allocated to this point. */
|
|
free(pdata);
|
|
free(direction_map);
|
|
free(low_contrast_map);
|
|
free(low_flow_map);
|
|
free(high_curve_map);
|
|
free(bdata);
|
|
return(ret);
|
|
}
|
|
|
|
if((ret = remove_false_minutia_V2(minutiae, bdata, iw, ih,
|
|
direction_map, low_flow_map, high_curve_map, mw, mh,
|
|
lfsparms))){
|
|
/* Free memory allocated to this point. */
|
|
free(pdata);
|
|
free(direction_map);
|
|
free(low_contrast_map);
|
|
free(low_flow_map);
|
|
free(high_curve_map);
|
|
free(bdata);
|
|
free_minutiae(minutiae);
|
|
return(ret);
|
|
}
|
|
|
|
print2log("\nMINUTIA DETECTION DONE\n");
|
|
|
|
/******************/
|
|
/* RIDGE COUNTS */
|
|
/******************/
|
|
if((ret = count_minutiae_ridges(minutiae, bdata, iw, ih, lfsparms))){
|
|
/* Free memory allocated to this point. */
|
|
free(pdata);
|
|
free(direction_map);
|
|
free(low_contrast_map);
|
|
free(low_flow_map);
|
|
free(high_curve_map);
|
|
free_minutiae(minutiae);
|
|
return(ret);
|
|
}
|
|
|
|
|
|
print2log("\nNEIGHBOR RIDGE COUNT DONE\n");
|
|
|
|
/******************/
|
|
/* WRAP-UP */
|
|
/******************/
|
|
|
|
/* Convert 8-bit binary image [0,1] to 8-bit */
|
|
/* grayscale binary image [0,255]. */
|
|
gray2bin(1, 255, 0, bdata, iw, ih);
|
|
|
|
/* Deallocate working memory. */
|
|
free(pdata);
|
|
|
|
/* Assign results to output pointers. */
|
|
*odmap = direction_map;
|
|
*olcmap = low_contrast_map;
|
|
*olfmap = low_flow_map;
|
|
*ohcmap = high_curve_map;
|
|
*omw = mw;
|
|
*omh = mh;
|
|
*obdata = bdata;
|
|
*obw = bw;
|
|
*obh = bh;
|
|
*ominutiae = minutiae;
|
|
|
|
/* If LOG_REPORT defined, close log report file. */
|
|
if((ret = close_logfile()))
|
|
return(ret);
|
|
|
|
return(0);
|
|
}
|
|
|