134 lines
5.1 KiB
C
134 lines
5.1 KiB
C
/*******************************************************************************
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License:
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This software was developed at the National Institute of Standards and
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Technology (NIST) by employees of the Federal Government in the course
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of their official duties. Pursuant to title 17 Section 105 of the
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United States Code, this software is not subject to copyright protection
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and is in the public domain. NIST assumes no responsibility whatsoever for
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its use by other parties, and makes no guarantees, expressed or implied,
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about its quality, reliability, or any other characteristic.
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Disclaimer:
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This software was developed to promote biometric standards and biometric
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technology testing for the Federal Government in accordance with the USA
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PATRIOT Act and the Enhanced Border Security and Visa Entry Reform Act.
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Specific hardware and software products identified in this software were used
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in order to perform the software development. In no case does such
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identification imply recommendation or endorsement by the National Institute
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of Standards and Technology, nor does it imply that the products and equipment
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identified are necessarily the best available for the purpose.
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*******************************************************************************/
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/***********************************************************************
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LIBRARY: LFS - NIST Latent Fingerprint System
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FILE: XYTREPS.C
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AUTHOR: Michael D. Garris
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DATE: 09/16/2004
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Contains routines useful in converting minutiae in LFS "native"
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representation into other representations, such as
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M1 (ANSI INCITS 378-2004) & NIST internal representations.
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***********************************************************************
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ROUTINES:
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lfs2nist_minutia_XTY()
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lfs2m1_minutia_XTY()
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***********************************************************************/
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#include <lfs.h>
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#include <defs.h>
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/*************************************************************************
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**************************************************************************
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#cat: lfs2nist_minutia_XYT - Converts XYT minutiae attributes in LFS native
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#cat: representation to NIST internal representation
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Input:
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minutia - LFS minutia structure containing attributes to be converted
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Output:
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ox - NIST internal based x-pixel coordinate
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oy - NIST internal based y-pixel coordinate
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ot - NIST internal based minutia direction/orientation
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Return Code:
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Zero - successful completion
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Negative - system error
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**************************************************************************/
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void lfs2nist_minutia_XYT(int *ox, int *oy, int *ot,
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const MINUTIA *minutia, const int iw, const int ih)
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{
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int x, y, t;
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float degrees_per_unit;
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/* XYT's according to NIST internal rep: */
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/* 1. pixel coordinates with origin bottom-left */
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/* 2. orientation in degrees on range [0..360] */
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/* with 0 pointing east and increasing counter */
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/* clockwise (same as M1) */
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/* 3. direction pointing out and away from the */
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/* ridge ending or bifurcation valley */
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/* (opposite direction from M1) */
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x = minutia->x;
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y = ih - minutia->y;
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degrees_per_unit = 180 / (float)NUM_DIRECTIONS;
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t = (270 - sround(minutia->direction * degrees_per_unit)) % 360;
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if(t < 0){
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t += 360;
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}
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*ox = x;
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*oy = y;
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*ot = t;
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}
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/*************************************************************************
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**************************************************************************
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#cat: lfs2m1_minutia_XYT - Converts XYT minutiae attributes in LFS native
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#cat: representation to M1 (ANSI INCITS 378-2004) representation
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Input:
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minutia - LFS minutia structure containing attributes to be converted
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Output:
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ox - M1 based x-pixel coordinate
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oy - M1 based y-pixel coordinate
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ot - M1 based minutia direction/orientation
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Return Code:
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Zero - successful completion
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Negative - system error
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**************************************************************************/
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void lfs2m1_minutia_XYT(int *ox, int *oy, int *ot, const MINUTIA *minutia)
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{
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int x, y, t;
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float degrees_per_unit;
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/* XYT's according to M1 (ANSI INCITS 378-2004): */
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/* 1. pixel coordinates with origin top-left */
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/* 2. orientation in degrees on range [0..179] */
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/* with 0 pointing east and increasing counter */
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/* clockwise */
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/* 3. direction pointing up the ridge ending or */
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/* bifurcaiton valley */
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x = minutia->x;
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y = minutia->y;
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degrees_per_unit = 180 / (float)NUM_DIRECTIONS;
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t = (90 - sround(minutia->direction * degrees_per_unit)) % 360;
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if(t < 0){
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t += 360;
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}
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/* range of theta is 0..179 because angles are in units of 2 degress */
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t = t / 2;
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*ox = x;
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*oy = y;
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*ot = t;
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}
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