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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2018 Google Inc. All rights reserved.
+// http://ceres-solver.org/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+// * Redistributions 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.
+// * Neither the name of Google Inc. nor the names of its contributors may 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 COPYRIGHT OWNER 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.
+//
+// Author: keir@google.com (Keir Mierle)
+//
+// End-to-end bundle adjustment test utilities for Ceres. This base is used in
+// the generated bundle adjustment test binaries. The reason to split the
+// bundle tests into separate binaries is so the tests can get parallelized.
+
+#include <cmath>
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+
+#include "ceres/internal/port.h"
+
+#include "ceres/autodiff_cost_function.h"
+#include "ceres/ordered_groups.h"
+#include "ceres/problem.h"
+#include "ceres/rotation.h"
+#include "ceres/solver.h"
+#include "ceres/stringprintf.h"
+#include "ceres/test_util.h"
+#include "ceres/types.h"
+#include "gflags/gflags.h"
+#include "glog/logging.h"
+#include "gtest/gtest.h"
+
+namespace ceres {
+namespace internal {
+
+using std::string;
+using std::vector;
+
+const bool kAutomaticOrdering = true;
+const bool kUserOrdering = false;
+
+// This class implements the SystemTestProblem interface and provides
+// access to a bundle adjustment problem. It is based on
+// examples/bundle_adjustment_example.cc. Currently a small 16 camera
+// problem is hard coded in the constructor.
+class BundleAdjustmentProblem {
+ public:
+ BundleAdjustmentProblem() {
+ const string input_file = TestFileAbsolutePath("problem-16-22106-pre.txt");
+ ReadData(input_file);
+ BuildProblem();
+ }
+
+ ~BundleAdjustmentProblem() {
+ delete []point_index_;
+ delete []camera_index_;
+ delete []observations_;
+ delete []parameters_;
+ }
+
+ Problem* mutable_problem() { return &problem_; }
+ Solver::Options* mutable_solver_options() { return &options_; }
+
+ int num_cameras() const { return num_cameras_; }
+ int num_points() const { return num_points_; }
+ int num_observations() const { return num_observations_; }
+ const int* point_index() const { return point_index_; }
+ const int* camera_index() const { return camera_index_; }
+ const double* observations() const { return observations_; }
+ double* mutable_cameras() { return parameters_; }
+ double* mutable_points() { return parameters_ + 9 * num_cameras_; }
+
+ static double kResidualTolerance;
+
+ private:
+ void ReadData(const string& filename) {
+ FILE * fptr = fopen(filename.c_str(), "r");
+
+ if (!fptr) {
+ LOG(FATAL) << "File Error: unable to open file " << filename;
+ }
+
+ // This will die horribly on invalid files. Them's the breaks.
+ FscanfOrDie(fptr, "%d", &num_cameras_);
+ FscanfOrDie(fptr, "%d", &num_points_);
+ FscanfOrDie(fptr, "%d", &num_observations_);
+
+ VLOG(1) << "Header: " << num_cameras_
+ << " " << num_points_
+ << " " << num_observations_;
+
+ point_index_ = new int[num_observations_];
+ camera_index_ = new int[num_observations_];
+ observations_ = new double[2 * num_observations_];
+
+ num_parameters_ = 9 * num_cameras_ + 3 * num_points_;
+ parameters_ = new double[num_parameters_];
+
+ for (int i = 0; i < num_observations_; ++i) {
+ FscanfOrDie(fptr, "%d", camera_index_ + i);
+ FscanfOrDie(fptr, "%d", point_index_ + i);
+ for (int j = 0; j < 2; ++j) {
+ FscanfOrDie(fptr, "%lf", observations_ + 2*i + j);
+ }
+ }
+
+ for (int i = 0; i < num_parameters_; ++i) {
+ FscanfOrDie(fptr, "%lf", parameters_ + i);
+ }
+
+ fclose(fptr);
+ }
+
+ void BuildProblem() {
+ double* points = mutable_points();
+ double* cameras = mutable_cameras();
+
+ for (int i = 0; i < num_observations(); ++i) {
+ // Each Residual block takes a point and a camera as input and
+ // outputs a 2 dimensional residual.
+ CostFunction* cost_function =
+ new AutoDiffCostFunction<BundlerResidual, 2, 9, 3>(
+ new BundlerResidual(observations_[2*i + 0],
+ observations_[2*i + 1]));
+
+ // Each observation corresponds to a pair of a camera and a point
+ // which are identified by camera_index()[i] and
+ // point_index()[i] respectively.
+ double* camera = cameras + 9 * camera_index_[i];
+ double* point = points + 3 * point_index()[i];
+ problem_.AddResidualBlock(cost_function, NULL, camera, point);
+ }
+
+ options_.linear_solver_ordering.reset(new ParameterBlockOrdering);
+
+ // The points come before the cameras.
+ for (int i = 0; i < num_points_; ++i) {
+ options_.linear_solver_ordering->AddElementToGroup(points + 3 * i, 0);
+ }
+
+ for (int i = 0; i < num_cameras_; ++i) {
+ options_.linear_solver_ordering->AddElementToGroup(cameras + 9 * i, 1);
+ }
+
+ options_.linear_solver_type = DENSE_SCHUR;
+ options_.max_num_iterations = 25;
+ options_.function_tolerance = 1e-10;
+ options_.gradient_tolerance = 1e-10;
+ options_.parameter_tolerance = 1e-10;
+ }
+
+ template<typename T>
+ void FscanfOrDie(FILE *fptr, const char *format, T *value) {
+ int num_scanned = fscanf(fptr, format, value);
+ if (num_scanned != 1) {
+ LOG(FATAL) << "Invalid UW data file.";
+ }
+ }
+
+ // Templated pinhole camera model. The camera is parameterized
+ // using 9 parameters. 3 for rotation, 3 for translation, 1 for
+ // focal length and 2 for radial distortion. The principal point is
+ // not modeled (i.e. it is assumed to be located at the image
+ // center).
+ struct BundlerResidual {
+ // (u, v): the position of the observation with respect to the image
+ // center point.
+ BundlerResidual(double u, double v): u(u), v(v) {}
+
+ template <typename T>
+ bool operator()(const T* const camera,
+ const T* const point,
+ T* residuals) const {
+ T p[3];
+ AngleAxisRotatePoint(camera, point, p);
+
+ // Add the translation vector
+ p[0] += camera[3];
+ p[1] += camera[4];
+ p[2] += camera[5];
+
+ const T& focal = camera[6];
+ const T& l1 = camera[7];
+ const T& l2 = camera[8];
+
+ // Compute the center of distortion. The sign change comes from
+ // the camera model that Noah Snavely's Bundler assumes, whereby
+ // the camera coordinate system has a negative z axis.
+ T xp = - focal * p[0] / p[2];
+ T yp = - focal * p[1] / p[2];
+
+ // Apply second and fourth order radial distortion.
+ T r2 = xp*xp + yp*yp;
+ T distortion = T(1.0) + r2 * (l1 + l2 * r2);
+
+ residuals[0] = distortion * xp - u;
+ residuals[1] = distortion * yp - v;
+
+ return true;
+ }
+
+ double u;
+ double v;
+ };
+
+ Problem problem_;
+ Solver::Options options_;
+
+ int num_cameras_;
+ int num_points_;
+ int num_observations_;
+ int num_parameters_;
+
+ int* point_index_;
+ int* camera_index_;
+ double* observations_;
+ // The parameter vector is laid out as follows
+ // [camera_1, ..., camera_n, point_1, ..., point_m]
+ double* parameters_;
+};
+
+double BundleAdjustmentProblem::kResidualTolerance = 1e-4;
+typedef SystemTest<BundleAdjustmentProblem> BundleAdjustmentTest;
+
+} // namespace internal
+} // namespace ceres