motion_corr2.m
上传用户:trade789
上传日期:2018-05-10
资源大小:603k
文件大小:4k
- % MOTION_CORR - Computes a set of interest point correspondences
- % between two successive frames in an image
- % sequence. First, a Harris corner detector is used
- % to choose interest points. Then, CORR is used to
- % obtain a matching, using both geometric constraints
- % and local similarity of the points' intensity
- % neighborhoods.
- %
- % Usage: [p1, p2, a, F] = motion_corr(im1, im2[, OPTIONS])
- %
- % Arguments:
- % im1 - an image
- % im2 - another image
- % Options:
- % 'p1' - an m x 3 matrix whose rows are
- % (homogeneous) coordinates of interest
- % points in im1; if supplied,
- % this matrix will be returned as p1; it can be
- % the empty matrix [] (in which case it is as if
- % they were not supplied)
- % 'smoothing' - pre-smoothing before corner detection
- % (default: 2.0)
- % 'nmsrad' - radius for non-maximal suppression of Harris
- % response matrix (default: 2)
- % 'rthresh' - relative threshold for Harris response
- % matrix (default: 0.3)
- % 'rthresh2' - smaller relative threshold used to
- % search for matches in the second image
- % (default: rthresh / 2.0)
- % 'sdthresh' - a distance threshold; no matches will be
- % accepted such that the Sampson distance
- % is greater than the threshold (default: 1.0)
- % 'dthresh' - a distance threshold; no matches will be
- % accepted such that the Euclidean
- % distance between the matched points is
- % greater than dthresh (default: 30)
- %
- % This function also accepts options for CORR.
- %
- % Returns:
- %
- % a - an m x 1 assignment vector. a(i) is the index of
- % the feature of the second image that was matched
- % to feature i of the first image. For example,
- % p1(i, :) is matched to p2(a(i), :). If feature i
- % (of the first image) was not matched to any
- % feature in the second image, then a(i) is zero.
- % F - the fundamental matrix used to compute the matching.
- %
- % See also CORR and HARRIS_PTS.
- % Copyright (C) 2002 Mark A. Paskin
- %
- % This program is free software; you can redistribute it and/or modify
- % it under the terms of the GNU General Public License as published by
- % the Free Software Foundation; either version 2 of the License, or
- % (at your option) any later version.
- %
- % This program is distributed in the hope that it will be useful, but
- % WITHOUT ANY WARRANTY; without even the implied warranty of
- % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- % General Public License for more details.
- %
- % You should have received a copy of the GNU General Public License
- % along with this program; if not, write to the Free Software
- % Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- % USA.
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- function [p1, p2 , a, F] = motion_corr2(f1,k1,f2,k2,im1,im2, varargin)
- % STEP 0: Process options
- [p1, ...
- smoothing, ...
- nmsrad, ...
- rthresh, ...
- rthresh2, ...
- sdthresh, ...
- dthresh, ...
- corr_opts] = process_options(varargin, 'p1', [], ...
- 'smoothing', 2, ...
- 'nmsrad', 2, ...
- 'rthresh', 0.3, ...
- 'rthresh2', nan, ...
- 'sdthresh', 1e-2, ...
- 'dthresh', 30);
- if (isnan(rthresh2)) rthresh2 = rthresh / 2.0; end
-
- % STEP 2: Form a cost matrix based upon local properties of the
- % interest points. The cost metric we use here is the sum of
- % squared differences of intensity values in a square
- % neighborhood around the pixels; a hard Euclidean distance
- % threshold is implemented so all point pairs that are too far
- % apart are given infinite cost.
- C = make_cost(k1,k2);
- p1 = f1(:,1:2); %create homogeneous coordinates
- p2 = f2(:,1:2);
- p1(:,3) = 1;
- p2(:,3) = 1;
- % STEP 3: Compute the correspondence.
- [a, F] = corr(p1, p2, C, 'sdthresh', sdthresh, corr_opts{:});