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opencv/modules/imgproc/test/test_connectedcomponents.cpp
Christoph Rackwitz a64b51dd94
Merge pull request #23108 from crackwitz:issue-23107 
Usage of imread(): magic number 0, unchecked result

* docs: rewrite 0/1 to IMREAD_GRAYSCALE/IMREAD_COLOR in imread()

* samples, apps: rewrite 0/1 to IMREAD_GRAYSCALE/IMREAD_COLOR in imread()

* tests: rewrite 0/1 to IMREAD_GRAYSCALE/IMREAD_COLOR in imread()

* doc/py_tutorials: check imread() result
2023-01-09 09:55:31 +00:00

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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.
//
//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., 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 the copyright holders 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
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// 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
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#include "test_precomp.hpp"
namespace opencv_test {
namespace {
class CV_ConnectedComponentsTest : public cvtest::BaseTest
{
public:
CV_ConnectedComponentsTest();
~CV_ConnectedComponentsTest();
protected:
void run(int);
};
CV_ConnectedComponentsTest::CV_ConnectedComponentsTest() {}
CV_ConnectedComponentsTest::~CV_ConnectedComponentsTest() {}
// This function force a row major order for the labels
void normalizeLabels(Mat1i& imgLabels, int iNumLabels) {
vector<int> vecNewLabels(iNumLabels + 1, 0);
int iMaxNewLabel = 0;
for (int r = 0; r < imgLabels.rows; ++r) {
for (int c = 0; c < imgLabels.cols; ++c) {
int iCurLabel = imgLabels(r, c);
if (iCurLabel > 0) {
if (vecNewLabels[iCurLabel] == 0) {
vecNewLabels[iCurLabel] = ++iMaxNewLabel;
}
imgLabels(r, c) = vecNewLabels[iCurLabel];
}
}
}
}
void CV_ConnectedComponentsTest::run(int /* start_from */)
{
int ccltype[] = { cv::CCL_DEFAULT, cv::CCL_WU, cv::CCL_GRANA, cv::CCL_BOLELLI, cv::CCL_SAUF, cv::CCL_BBDT, cv::CCL_SPAGHETTI };
string exp_path = string(ts->get_data_path()) + "connectedcomponents/ccomp_exp.png";
Mat exp = imread(exp_path, IMREAD_GRAYSCALE);
Mat orig = imread(string(ts->get_data_path()) + "connectedcomponents/concentric_circles.png", 0);
if (orig.empty())
{
ts->set_failed_test_info(cvtest::TS::FAIL_INVALID_TEST_DATA);
return;
}
Mat bw = orig > 128;
for (uint cclt = 0; cclt < sizeof(ccltype) / sizeof(int); ++cclt)
{
Mat1i labelImage;
int nLabels = connectedComponents(bw, labelImage, 8, CV_32S, ccltype[cclt]);
normalizeLabels(labelImage, nLabels);
// Validate test results
for (int r = 0; r < labelImage.rows; ++r) {
for (int c = 0; c < labelImage.cols; ++c) {
int l = labelImage.at<int>(r, c);
bool pass = l >= 0 && l <= nLabels;
if (!pass) {
ts->set_failed_test_info(cvtest::TS::FAIL_INVALID_OUTPUT);
return;
}
}
}
if (exp.empty() || orig.size() != exp.size())
{
imwrite(exp_path, labelImage);
exp = labelImage;
}
if (0 != cvtest::norm(labelImage > 0, exp > 0, NORM_INF))
{
ts->set_failed_test_info(cvtest::TS::FAIL_MISMATCH);
return;
}
if (nLabels != cvtest::norm(labelImage, NORM_INF) + 1)
{
ts->set_failed_test_info(cvtest::TS::FAIL_MISMATCH);
return;
}
}
ts->set_failed_test_info(cvtest::TS::OK);
}
TEST(Imgproc_ConnectedComponents, regression) { CV_ConnectedComponentsTest test; test.safe_run(); }
TEST(Imgproc_ConnectedComponents, grana_buffer_overflow)
{
cv::Mat darkMask;
darkMask.create(31, 87, CV_8U);
darkMask = 0;
cv::Mat labels;
cv::Mat stats;
cv::Mat centroids;
int nbComponents = cv::connectedComponentsWithStats(darkMask, labels, stats, centroids, 8, CV_32S, cv::CCL_GRANA);
EXPECT_EQ(1, nbComponents);
}
static cv::Mat createCrashMat(int numThreads) {
const int h = numThreads * 4 * 2 + 8;
const double nParallelStripes = std::max(1, std::min(h / 2, numThreads * 4));
const int w = 4;
const int nstripes = cvRound(nParallelStripes <= 0 ? h : MIN(MAX(nParallelStripes, 1.), h));
const cv::Range stripeRange(0, nstripes);
const cv::Range wholeRange(0, h);
cv::Mat m(h, w, CV_8U);
m = 0;
// Look for a range that starts with odd value and ends with even value
cv::Range bugRange;
for (int s = stripeRange.start; s < stripeRange.end; s++) {
cv::Range sr(s, s + 1);
cv::Range r;
r.start = (int)(wholeRange.start +
((uint64)sr.start * (wholeRange.end - wholeRange.start) + nstripes / 2) / nstripes);
r.end = sr.end >= nstripes ?
wholeRange.end :
(int)(wholeRange.start +
((uint64)sr.end * (wholeRange.end - wholeRange.start) + nstripes / 2) / nstripes);
if (r.start > 0 && r.start % 2 == 1 && r.end % 2 == 0 && r.end >= r.start + 2) {
bugRange = r;
break;
}
}
if (bugRange.empty()) { // Could not create a buggy range
return m;
}
// Fill in bug Range
for (int x = 1; x < w; x++) {
m.at<char>(bugRange.start - 1, x) = 1;
}
m.at<char>(bugRange.start + 0, 0) = 1;
m.at<char>(bugRange.start + 0, 1) = 1;
m.at<char>(bugRange.start + 0, 3) = 1;
m.at<char>(bugRange.start + 1, 1) = 1;
m.at<char>(bugRange.start + 2, 1) = 1;
m.at<char>(bugRange.start + 2, 3) = 1;
m.at<char>(bugRange.start + 3, 0) = 1;
m.at<char>(bugRange.start + 3, 1) = 1;
return m;
}
TEST(Imgproc_ConnectedComponents, parallel_wu_labels)
{
cv::Mat mat = createCrashMat(cv::getNumThreads());
if (mat.empty()) {
return;
}
const int nbPixels = cv::countNonZero(mat);
cv::Mat labels;
cv::Mat stats;
cv::Mat centroids;
int nb = 0;
EXPECT_NO_THROW(nb = cv::connectedComponentsWithStats(mat, labels, stats, centroids, 8, CV_32S, cv::CCL_WU));
int area = 0;
for (int i = 1; i < nb; ++i) {
area += stats.at<int32_t>(i, cv::CC_STAT_AREA);
}
EXPECT_EQ(nbPixels, area);
}
TEST(Imgproc_ConnectedComponents, missing_background_pixels)
{
cv::Mat m = Mat::ones(10, 10, CV_8U);
cv::Mat labels;
cv::Mat stats;
cv::Mat centroids;
EXPECT_NO_THROW(cv::connectedComponentsWithStats(m, labels, stats, centroids, 8, CV_32S, cv::CCL_WU));
EXPECT_EQ(stats.at<int32_t>(0, cv::CC_STAT_WIDTH), 0);
EXPECT_EQ(stats.at<int32_t>(0, cv::CC_STAT_HEIGHT), 0);
EXPECT_EQ(stats.at<int32_t>(0, cv::CC_STAT_LEFT), -1);
EXPECT_TRUE(std::isnan(centroids.at<double>(0, 0)));
EXPECT_TRUE(std::isnan(centroids.at<double>(0, 1)));
}
TEST(Imgproc_ConnectedComponents, spaghetti_bbdt_sauf_stats)
{
cv::Mat1b img(16, 16);
img << 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0,
0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0,
0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1;
cv::Mat1i labels;
cv::Mat1i stats;
cv::Mat1d centroids;
int ccltype[] = { cv::CCL_WU, cv::CCL_GRANA, cv::CCL_BOLELLI, cv::CCL_SAUF, cv::CCL_BBDT, cv::CCL_SPAGHETTI };
for (uint cclt = 0; cclt < sizeof(ccltype) / sizeof(int); ++cclt) {
EXPECT_NO_THROW(cv::connectedComponentsWithStats(img, labels, stats, centroids, 8, CV_32S, ccltype[cclt]));
EXPECT_EQ(stats(0, cv::CC_STAT_LEFT), 0);
EXPECT_EQ(stats(0, cv::CC_STAT_TOP), 0);
EXPECT_EQ(stats(0, cv::CC_STAT_WIDTH), 16);
EXPECT_EQ(stats(0, cv::CC_STAT_HEIGHT), 15);
EXPECT_EQ(stats(0, cv::CC_STAT_AREA), 144);
EXPECT_EQ(stats(1, cv::CC_STAT_LEFT), 1);
EXPECT_EQ(stats(1, cv::CC_STAT_TOP), 1);
EXPECT_EQ(stats(1, cv::CC_STAT_WIDTH), 3);
EXPECT_EQ(stats(1, cv::CC_STAT_HEIGHT), 3);
EXPECT_EQ(stats(1, cv::CC_STAT_AREA), 9);
EXPECT_EQ(stats(2, cv::CC_STAT_LEFT), 1);
EXPECT_EQ(stats(2, cv::CC_STAT_TOP), 1);
EXPECT_EQ(stats(2, cv::CC_STAT_WIDTH), 8);
EXPECT_EQ(stats(2, cv::CC_STAT_HEIGHT), 7);
EXPECT_EQ(stats(2, cv::CC_STAT_AREA), 40);
EXPECT_EQ(stats(3, cv::CC_STAT_LEFT), 10);
EXPECT_EQ(stats(3, cv::CC_STAT_TOP), 2);
EXPECT_EQ(stats(3, cv::CC_STAT_WIDTH), 5);
EXPECT_EQ(stats(3, cv::CC_STAT_HEIGHT), 2);
EXPECT_EQ(stats(3, cv::CC_STAT_AREA), 8);
EXPECT_EQ(stats(4, cv::CC_STAT_LEFT), 11);
EXPECT_EQ(stats(4, cv::CC_STAT_TOP), 5);
EXPECT_EQ(stats(4, cv::CC_STAT_WIDTH), 3);
EXPECT_EQ(stats(4, cv::CC_STAT_HEIGHT), 3);
EXPECT_EQ(stats(4, cv::CC_STAT_AREA), 9);
EXPECT_EQ(stats(5, cv::CC_STAT_LEFT), 2);
EXPECT_EQ(stats(5, cv::CC_STAT_TOP), 9);
EXPECT_EQ(stats(5, cv::CC_STAT_WIDTH), 1);
EXPECT_EQ(stats(5, cv::CC_STAT_HEIGHT), 1);
EXPECT_EQ(stats(5, cv::CC_STAT_AREA), 1);
EXPECT_EQ(stats(6, cv::CC_STAT_LEFT), 12);
EXPECT_EQ(stats(6, cv::CC_STAT_TOP), 9);
EXPECT_EQ(stats(6, cv::CC_STAT_WIDTH), 1);
EXPECT_EQ(stats(6, cv::CC_STAT_HEIGHT), 1);
EXPECT_EQ(stats(6, cv::CC_STAT_AREA), 1);
// Labels' order could be different!
if (cclt == cv::CCL_WU || cclt == cv::CCL_SAUF) {
// CCL_SAUF, CCL_WU
EXPECT_EQ(stats(9, cv::CC_STAT_LEFT), 1);
EXPECT_EQ(stats(9, cv::CC_STAT_TOP), 11);
EXPECT_EQ(stats(9, cv::CC_STAT_WIDTH), 4);
EXPECT_EQ(stats(9, cv::CC_STAT_HEIGHT), 2);
EXPECT_EQ(stats(9, cv::CC_STAT_AREA), 8);
EXPECT_EQ(stats(7, cv::CC_STAT_LEFT), 6);
EXPECT_EQ(stats(7, cv::CC_STAT_TOP), 10);
EXPECT_EQ(stats(7, cv::CC_STAT_WIDTH), 4);
EXPECT_EQ(stats(7, cv::CC_STAT_HEIGHT), 2);
EXPECT_EQ(stats(7, cv::CC_STAT_AREA), 8);
EXPECT_EQ(stats(8, cv::CC_STAT_LEFT), 0);
EXPECT_EQ(stats(8, cv::CC_STAT_TOP), 10);
EXPECT_EQ(stats(8, cv::CC_STAT_WIDTH), 16);
EXPECT_EQ(stats(8, cv::CC_STAT_HEIGHT), 6);
EXPECT_EQ(stats(8, cv::CC_STAT_AREA), 21);
}
else {
// CCL_BBDT, CCL_GRANA, CCL_SPAGHETTI, CCL_BOLELLI
EXPECT_EQ(stats(7, cv::CC_STAT_LEFT), 1);
EXPECT_EQ(stats(7, cv::CC_STAT_TOP), 11);
EXPECT_EQ(stats(7, cv::CC_STAT_WIDTH), 4);
EXPECT_EQ(stats(7, cv::CC_STAT_HEIGHT), 2);
EXPECT_EQ(stats(7, cv::CC_STAT_AREA), 8);
EXPECT_EQ(stats(8, cv::CC_STAT_LEFT), 6);
EXPECT_EQ(stats(8, cv::CC_STAT_TOP), 10);
EXPECT_EQ(stats(8, cv::CC_STAT_WIDTH), 4);
EXPECT_EQ(stats(8, cv::CC_STAT_HEIGHT), 2);
EXPECT_EQ(stats(8, cv::CC_STAT_AREA), 8);
EXPECT_EQ(stats(9, cv::CC_STAT_LEFT), 0);
EXPECT_EQ(stats(9, cv::CC_STAT_TOP), 10);
EXPECT_EQ(stats(9, cv::CC_STAT_WIDTH), 16);
EXPECT_EQ(stats(9, cv::CC_STAT_HEIGHT), 6);
EXPECT_EQ(stats(9, cv::CC_STAT_AREA), 21);
}
EXPECT_EQ(stats(10, cv::CC_STAT_LEFT), 9);
EXPECT_EQ(stats(10, cv::CC_STAT_TOP), 12);
EXPECT_EQ(stats(10, cv::CC_STAT_WIDTH), 5);
EXPECT_EQ(stats(10, cv::CC_STAT_HEIGHT), 2);
EXPECT_EQ(stats(10, cv::CC_STAT_AREA), 7);
}
}
TEST(Imgproc_ConnectedComponents, chessboard_even)
{
cv::Size size(16, 16);
cv::Mat1b input(size);
cv::Mat1i output_8c(size);
cv::Mat1i output_4c(size);
// Chessboard image with even number of rows and cols
// Note that this is the maximum number of labels for 4-way connectivity
{
input <<
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
output_8c <<
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
output_4c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8, 0,
0, 9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 15, 0, 16,
17, 0, 18, 0, 19, 0, 20, 0, 21, 0, 22, 0, 23, 0, 24, 0,
0, 25, 0, 26, 0, 27, 0, 28, 0, 29, 0, 30, 0, 31, 0, 32,
33, 0, 34, 0, 35, 0, 36, 0, 37, 0, 38, 0, 39, 0, 40, 0,
0, 41, 0, 42, 0, 43, 0, 44, 0, 45, 0, 46, 0, 47, 0, 48,
49, 0, 50, 0, 51, 0, 52, 0, 53, 0, 54, 0, 55, 0, 56, 0,
0, 57, 0, 58, 0, 59, 0, 60, 0, 61, 0, 62, 0, 63, 0, 64,
65, 0, 66, 0, 67, 0, 68, 0, 69, 0, 70, 0, 71, 0, 72, 0,
0, 73, 0, 74, 0, 75, 0, 76, 0, 77, 0, 78, 0, 79, 0, 80,
81, 0, 82, 0, 83, 0, 84, 0, 85, 0, 86, 0, 87, 0, 88, 0,
0, 89, 0, 90, 0, 91, 0, 92, 0, 93, 0, 94, 0, 95, 0, 96,
97, 0, 98, 0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0,
0, 105, 0, 106, 0, 107, 0, 108, 0, 109, 0, 110, 0, 111, 0, 112,
113, 0, 114, 0, 115, 0, 116, 0, 117, 0, 118, 0, 119, 0, 120, 0,
0, 121, 0, 122, 0, 123, 0, 124, 0, 125, 0, 126, 0, 127, 0, 128;
}
int ccltype[] = { cv::CCL_DEFAULT, cv::CCL_WU, cv::CCL_GRANA, cv::CCL_BOLELLI, cv::CCL_SAUF, cv::CCL_BBDT, cv::CCL_SPAGHETTI };
cv::Mat1i labels;
cv::Mat diff;
int nLabels = 0;
for (size_t cclt = 0; cclt < sizeof(ccltype) / sizeof(int); ++cclt) {
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 8, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_8c;
EXPECT_EQ(cv::countNonZero(diff), 0);
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 4, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_4c;
EXPECT_EQ(cv::countNonZero(diff), 0);
}
}
TEST(Imgproc_ConnectedComponents, chessboard_odd)
{
cv::Size size(15, 15);
cv::Mat1b input(size);
cv::Mat1i output_8c(size);
cv::Mat1i output_4c(size);
// Chessboard image with odd number of rows and cols
// Note that this is the maximum number of labels for 4-way connectivity
{
input <<
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
output_8c <<
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
output_4c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8,
0, 9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 15, 0,
16, 0, 17, 0, 18, 0, 19, 0, 20, 0, 21, 0, 22, 0, 23,
0, 24, 0, 25, 0, 26, 0, 27, 0, 28, 0, 29, 0, 30, 0,
31, 0, 32, 0, 33, 0, 34, 0, 35, 0, 36, 0, 37, 0, 38,
0, 39, 0, 40, 0, 41, 0, 42, 0, 43, 0, 44, 0, 45, 0,
46, 0, 47, 0, 48, 0, 49, 0, 50, 0, 51, 0, 52, 0, 53,
0, 54, 0, 55, 0, 56, 0, 57, 0, 58, 0, 59, 0, 60, 0,
61, 0, 62, 0, 63, 0, 64, 0, 65, 0, 66, 0, 67, 0, 68,
0, 69, 0, 70, 0, 71, 0, 72, 0, 73, 0, 74, 0, 75, 0,
76, 0, 77, 0, 78, 0, 79, 0, 80, 0, 81, 0, 82, 0, 83,
0, 84, 0, 85, 0, 86, 0, 87, 0, 88, 0, 89, 0, 90, 0,
91, 0, 92, 0, 93, 0, 94, 0, 95, 0, 96, 0, 97, 0, 98,
0, 99, 0, 100, 0, 101, 0, 102, 0, 103, 0, 104, 0, 105, 0,
106, 0, 107, 0, 108, 0, 109, 0, 110, 0, 111, 0, 112, 0, 113;
}
int ccltype[] = { cv::CCL_DEFAULT, cv::CCL_WU, cv::CCL_GRANA, cv::CCL_BOLELLI, cv::CCL_SAUF, cv::CCL_BBDT, cv::CCL_SPAGHETTI };
cv::Mat1i labels;
cv::Mat diff;
int nLabels = 0;
for (size_t cclt = 0; cclt < sizeof(ccltype) / sizeof(int); ++cclt) {
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 8, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_8c;
EXPECT_EQ(cv::countNonZero(diff), 0);
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 4, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_4c;
EXPECT_EQ(cv::countNonZero(diff), 0);
}
}
TEST(Imgproc_ConnectedComponents, maxlabels_8conn_even)
{
cv::Size size(16, 16);
cv::Mat1b input(size);
cv::Mat1i output_8c(size);
cv::Mat1i output_4c(size);
{
input <<
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
output_8c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 15, 0, 16, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
17, 0, 18, 0, 19, 0, 20, 0, 21, 0, 22, 0, 23, 0, 24, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
25, 0, 26, 0, 27, 0, 28, 0, 29, 0, 30, 0, 31, 0, 32, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
33, 0, 34, 0, 35, 0, 36, 0, 37, 0, 38, 0, 39, 0, 40, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
41, 0, 42, 0, 43, 0, 44, 0, 45, 0, 46, 0, 47, 0, 48, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
49, 0, 50, 0, 51, 0, 52, 0, 53, 0, 54, 0, 55, 0, 56, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57, 0, 58, 0, 59, 0, 60, 0, 61, 0, 62, 0, 63, 0, 64, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
output_4c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 15, 0, 16, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
17, 0, 18, 0, 19, 0, 20, 0, 21, 0, 22, 0, 23, 0, 24, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
25, 0, 26, 0, 27, 0, 28, 0, 29, 0, 30, 0, 31, 0, 32, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
33, 0, 34, 0, 35, 0, 36, 0, 37, 0, 38, 0, 39, 0, 40, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
41, 0, 42, 0, 43, 0, 44, 0, 45, 0, 46, 0, 47, 0, 48, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
49, 0, 50, 0, 51, 0, 52, 0, 53, 0, 54, 0, 55, 0, 56, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57, 0, 58, 0, 59, 0, 60, 0, 61, 0, 62, 0, 63, 0, 64, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0;
}
int ccltype[] = { cv::CCL_DEFAULT, cv::CCL_WU, cv::CCL_GRANA, cv::CCL_BOLELLI, cv::CCL_SAUF, cv::CCL_BBDT, cv::CCL_SPAGHETTI };
cv::Mat1i labels;
cv::Mat diff;
int nLabels = 0;
for (size_t cclt = 0; cclt < sizeof(ccltype) / sizeof(int); ++cclt) {
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 8, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_8c;
EXPECT_EQ(cv::countNonZero(diff), 0);
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 4, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_4c;
EXPECT_EQ(cv::countNonZero(diff), 0);
}
}
TEST(Imgproc_ConnectedComponents, maxlabels_8conn_odd)
{
cv::Size size(15, 15);
cv::Mat1b input(size);
cv::Mat1i output_8c(size);
cv::Mat1i output_4c(size);
{
input <<
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
output_8c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 15, 0, 16,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
17, 0, 18, 0, 19, 0, 20, 0, 21, 0, 22, 0, 23, 0, 24,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
25, 0, 26, 0, 27, 0, 28, 0, 29, 0, 30, 0, 31, 0, 32,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
33, 0, 34, 0, 35, 0, 36, 0, 37, 0, 38, 0, 39, 0, 40,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
41, 0, 42, 0, 43, 0, 44, 0, 45, 0, 46, 0, 47, 0, 48,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
49, 0, 50, 0, 51, 0, 52, 0, 53, 0, 54, 0, 55, 0, 56,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57, 0, 58, 0, 59, 0, 60, 0, 61, 0, 62, 0, 63, 0, 64;
output_4c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
9, 0, 10, 0, 11, 0, 12, 0, 13, 0, 14, 0, 15, 0, 16,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
17, 0, 18, 0, 19, 0, 20, 0, 21, 0, 22, 0, 23, 0, 24,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
25, 0, 26, 0, 27, 0, 28, 0, 29, 0, 30, 0, 31, 0, 32,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
33, 0, 34, 0, 35, 0, 36, 0, 37, 0, 38, 0, 39, 0, 40,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
41, 0, 42, 0, 43, 0, 44, 0, 45, 0, 46, 0, 47, 0, 48,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
49, 0, 50, 0, 51, 0, 52, 0, 53, 0, 54, 0, 55, 0, 56,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
57, 0, 58, 0, 59, 0, 60, 0, 61, 0, 62, 0, 63, 0, 64;
}
int ccltype[] = { cv::CCL_DEFAULT, cv::CCL_WU, cv::CCL_GRANA, cv::CCL_BOLELLI, cv::CCL_SAUF, cv::CCL_BBDT, cv::CCL_SPAGHETTI };
cv::Mat1i labels;
cv::Mat diff;
int nLabels = 0;
for (size_t cclt = 0; cclt < sizeof(ccltype) / sizeof(int); ++cclt) {
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 8, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_8c;
EXPECT_EQ(cv::countNonZero(diff), 0);
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 4, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_4c;
EXPECT_EQ(cv::countNonZero(diff), 0);
}
}
TEST(Imgproc_ConnectedComponents, single_row)
{
cv::Size size(1, 15);
cv::Mat1b input(size);
cv::Mat1i output_8c(size);
cv::Mat1i output_4c(size);
{
input <<
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
output_8c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8;
output_4c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8;
}
int ccltype[] = { cv::CCL_DEFAULT, cv::CCL_WU, cv::CCL_GRANA, cv::CCL_BOLELLI, cv::CCL_SAUF, cv::CCL_BBDT, cv::CCL_SPAGHETTI };
cv::Mat1i labels;
cv::Mat diff;
int nLabels = 0;
for (size_t cclt = 0; cclt < sizeof(ccltype) / sizeof(int); ++cclt) {
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 8, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_8c;
EXPECT_EQ(cv::countNonZero(diff), 0);
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 4, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_4c;
EXPECT_EQ(cv::countNonZero(diff), 0);
}
}
TEST(Imgproc_ConnectedComponents, single_column)
{
cv::Size size(15, 1);
cv::Mat1b input(size);
cv::Mat1i output_8c(size);
cv::Mat1i output_4c(size);
{
input <<
1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1;
output_8c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8;
output_4c <<
1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8;
}
int ccltype[] = { cv::CCL_DEFAULT, cv::CCL_WU, cv::CCL_GRANA, cv::CCL_BOLELLI, cv::CCL_SAUF, cv::CCL_BBDT, cv::CCL_SPAGHETTI };
cv::Mat1i labels;
cv::Mat diff;
int nLabels = 0;
for (size_t cclt = 0; cclt < sizeof(ccltype) / sizeof(int); ++cclt) {
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 8, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_8c;
EXPECT_EQ(cv::countNonZero(diff), 0);
EXPECT_NO_THROW(nLabels = cv::connectedComponents(input, labels, 4, CV_32S, ccltype[cclt]));
normalizeLabels(labels, nLabels);
diff = labels != output_4c;
EXPECT_EQ(cv::countNonZero(diff), 0);
}
}
TEST(Imgproc_ConnectedComponents, 4conn_regression_21366)
{
Mat src = Mat::zeros(Size(10, 10), CV_8UC1);
{
Mat labels, stats, centroids;
EXPECT_NO_THROW(cv::connectedComponentsWithStats(src, labels, stats, centroids, 4));
}
}
}
} // namespace
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