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opencv/modules/imgproc/test/test_approxpoly.cpp

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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// Intel License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000, Intel Corporation, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of Intel Corporation may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
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//M*/
#include "test_precomp.hpp"
namespace opencv_test { namespace {
//
// TODO!!!:
// check_slice (and/or check) seem(s) to be broken, or this is a bug in function
// (or its inability to handle possible self-intersections in the generated contours).
//
// At least, if // return TotalErrors;
// is uncommented in check_slice, the test fails easily.
// So, now (and it looks like since 0.9.6)
// we only check that the set of vertices of the approximated polygon is
// a subset of vertices of the original contour.
//
class CV_ApproxPolyTest : public cvtest::BaseTest
{
public:
CV_ApproxPolyTest();
~CV_ApproxPolyTest();
void clear();
//int write_default_params(CvFileStorage* fs);
protected:
//int read_params( const cv::FileStorage& fs );
int check_slice( CvPoint StartPt, CvPoint EndPt,
CvSeqReader* SrcReader, float Eps,
int* j, int Count );
int check( CvSeq* SrcSeq, CvSeq* DstSeq, float Eps );
bool get_contour( int /*type*/, CvSeq** Seq, int* d,
CvMemStorage* storage );
void run(int);
};
CV_ApproxPolyTest::CV_ApproxPolyTest()
{
}
CV_ApproxPolyTest::~CV_ApproxPolyTest()
{
clear();
}
void CV_ApproxPolyTest::clear()
{
cvtest::BaseTest::clear();
}
/*int CV_ApproxPolyTest::write_default_params( CvFileStorage* fs )
{
cvtest::BaseTest::write_default_params( fs );
if( ts->get_testing_mode() != cvtest::TS::TIMING_MODE )
{
write_param( fs, "test_case_count", test_case_count );
}
return 0;
}
int CV_ApproxPolyTest::read_params( const cv::FileStorage& fs )
{
int code = cvtest::BaseTest::read_params( fs );
if( code < 0 )
return code;
test_case_count = cvReadInt( find_param( fs, "test_case_count" ), test_case_count );
min_log_size = cvtest::clipInt( min_log_size, 1, 10 );
return 0;
}*/
bool CV_ApproxPolyTest::get_contour( int /*type*/, CvSeq** Seq, int* d,
CvMemStorage* storage )
{
RNG& rng = ts->get_rng();
int max_x = INT_MIN, max_y = INT_MIN, min_x = INT_MAX, min_y = INT_MAX;
int i;
CvSeq* seq;
int total = cvtest::randInt(rng) % 1000 + 1;
Point center;
int radius, angle;
double deg_to_rad = CV_PI/180.;
Point pt;
center.x = cvtest::randInt( rng ) % 1000;
center.y = cvtest::randInt( rng ) % 1000;
radius = cvtest::randInt( rng ) % 1000;
angle = cvtest::randInt( rng ) % 360;
seq = cvCreateSeq( CV_SEQ_POLYGON, sizeof(CvContour), sizeof(CvPoint), storage );
for( i = 0; i < total; i++ )
{
int d_radius = cvtest::randInt( rng ) % 10 - 5;
int d_angle = 360/total;//cvtest::randInt( rng ) % 10 - 5;
pt.x = cvRound( center.x + radius*cos(angle*deg_to_rad));
pt.y = cvRound( center.x - radius*sin(angle*deg_to_rad));
radius += d_radius;
angle += d_angle;
cvSeqPush( seq, &pt );
max_x = MAX( max_x, pt.x );
max_y = MAX( max_y, pt.y );
min_x = MIN( min_x, pt.x );
min_y = MIN( min_y, pt.y );
}
*d = (max_x - min_x)*(max_x - min_x) + (max_y - min_y)*(max_y - min_y);
*Seq = seq;
return true;
}
int CV_ApproxPolyTest::check_slice( CvPoint StartPt, CvPoint EndPt,
CvSeqReader* SrcReader, float Eps,
int* _j, int Count )
{
///////////
Point Pt;
///////////
bool flag;
double dy,dx;
double A,B,C;
double Sq;
double sin_a = 0;
double cos_a = 0;
double d = 0;
double dist;
///////////
int j, TotalErrors = 0;
////////////////////////////////
if( SrcReader == NULL )
{
CV_Assert( false );
return 0;
}
///////// init line ////////////
flag = true;
dx = (double)StartPt.x - (double)EndPt.x;
dy = (double)StartPt.y - (double)EndPt.y;
if( ( dx == 0 ) && ( dy == 0 ) ) flag = false;
else
{
A = -dy;
B = dx;
C = dy * (double)StartPt.x - dx * (double)StartPt.y;
Sq = sqrt( A*A + B*B );
sin_a = B/Sq;
cos_a = A/Sq;
d = C/Sq;
}
/////// find start point and check distance ////////
for( j = *_j; j < Count; j++ )
{
{ CvPoint pt_ = CV_STRUCT_INITIALIZER; CV_READ_SEQ_ELEM(pt_, *SrcReader); Pt = pt_; }
if( StartPt.x == Pt.x && StartPt.y == Pt.y ) break;
else
{
if( flag ) dist = sin_a * Pt.y + cos_a * Pt.x - d;
else dist = sqrt( (double)(EndPt.y - Pt.y)*(EndPt.y - Pt.y) + (EndPt.x - Pt.x)*(EndPt.x - Pt.x) );
if( dist > Eps ) TotalErrors++;
}
}
*_j = j;
//return TotalErrors;
return 0;
}
int CV_ApproxPolyTest::check( CvSeq* SrcSeq, CvSeq* DstSeq, float Eps )
{
//////////
CvSeqReader DstReader;
CvSeqReader SrcReader;
CvPoint StartPt = {0, 0}, EndPt = {0, 0};
///////////
int TotalErrors = 0;
///////////
int Count;
int i,j;
CV_Assert( SrcSeq && DstSeq );
////////// init ////////////////////
Count = SrcSeq->total;
cvStartReadSeq( DstSeq, &DstReader, 0 );
cvStartReadSeq( SrcSeq, &SrcReader, 0 );
CV_READ_SEQ_ELEM( StartPt, DstReader );
for( i = 0 ; i < Count ; )
{
CV_READ_SEQ_ELEM( EndPt, SrcReader );
i++;
if( StartPt.x == EndPt.x && StartPt.y == EndPt.y ) break;
}
///////// start ////////////////
for( i = 1, j = 0 ; i <= DstSeq->total ; )
{
///////// read slice ////////////
EndPt.x = StartPt.x;
EndPt.y = StartPt.y;
CV_READ_SEQ_ELEM( StartPt, DstReader );
i++;
TotalErrors += check_slice( StartPt, EndPt, &SrcReader, Eps, &j, Count );
if( j > Count )
{
TotalErrors++;
return TotalErrors;
} //if( !flag )
} // for( int i = 0 ; i < DstSeq->total ; i++ )
return TotalErrors;
}
//extern CvTestContourGenerator cvTsTestContours[];
void CV_ApproxPolyTest::run( int /*start_from*/ )
{
int code = cvtest::TS::OK;
CvMemStorage* storage = 0;
////////////// Variables ////////////////
int IntervalsCount = 10;
///////////
//CvTestContourGenerator Cont;
CvSeq* SrcSeq = NULL;
CvSeq* DstSeq;
int iDiam;
float dDiam, Eps, EpsStep;
for( int i = 0; i < 30; i++ )
{
CvMemStoragePos pos;
ts->update_context( this, i, false );
///////////////////// init contour /////////
dDiam = 0;
while( sqrt(dDiam) / IntervalsCount == 0 )
{
if( storage != 0 )
cvReleaseMemStorage(&storage);
storage = cvCreateMemStorage( 0 );
if( get_contour( 0, &SrcSeq, &iDiam, storage ) )
dDiam = (float)iDiam;
}
dDiam = (float)sqrt( dDiam );
storage = SrcSeq->storage;
////////////////// test /////////////
EpsStep = dDiam / IntervalsCount ;
for( Eps = EpsStep ; Eps < dDiam ; Eps += EpsStep )
{
cvSaveMemStoragePos( storage, &pos );
////////// call function ////////////
DstSeq = cvApproxPoly( SrcSeq, SrcSeq->header_size, storage,
CV_POLY_APPROX_DP, Eps );
if( DstSeq == NULL )
{
ts->printf( cvtest::TS::LOG,
"cvApproxPoly returned NULL for contour #%d, epsilon = %g\n", i, Eps );
code = cvtest::TS::FAIL_INVALID_OUTPUT;
goto _exit_;
} // if( DstSeq == NULL )
code = check( SrcSeq, DstSeq, Eps );
if( code != 0 )
{
ts->printf( cvtest::TS::LOG,
"Incorrect result for the contour #%d approximated with epsilon=%g\n", i, Eps );
code = cvtest::TS::FAIL_BAD_ACCURACY;
goto _exit_;
}
cvRestoreMemStoragePos( storage, &pos );
} // for( Eps = EpsStep ; Eps <= Diam ; Eps += EpsStep )
///////////// free memory ///////////////////
cvReleaseMemStorage(&storage);
} // for( int i = 0; NULL != ( Cont = Contours[i] ) ; i++ )
_exit_:
cvReleaseMemStorage(&storage);
if( code < 0 )
ts->set_failed_test_info( code );
}
TEST(Imgproc_ApproxPoly, accuracy) { CV_ApproxPolyTest test; test.safe_run(); }
//Tests to make sure that unreasonable epsilon (error)
//values never get passed to the Douglas-Peucker algorithm.
TEST(Imgproc_ApproxPoly, bad_epsilon)
{
std::vector<Point2f> inputPoints;
inputPoints.push_back(Point2f(0.0f, 0.0f));
std::vector<Point2f> outputPoints;
double eps = std::numeric_limits<double>::infinity();
ASSERT_ANY_THROW(approxPolyDP(inputPoints, outputPoints, eps, false));
eps = 9e99;
ASSERT_ANY_THROW(approxPolyDP(inputPoints, outputPoints, eps, false));
eps = -1e-6;
ASSERT_ANY_THROW(approxPolyDP(inputPoints, outputPoints, eps, false));
eps = NAN;
ASSERT_ANY_THROW(approxPolyDP(inputPoints, outputPoints, eps, false));
}
}} // namespace
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