// Copyright (C) 2011 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#undef DLIB_STRUCTURAL_SVM_ObJECT_DETECTION_PROBLEM_ABSTRACT_Hh_
#ifdef DLIB_STRUCTURAL_SVM_ObJECT_DETECTION_PROBLEM_ABSTRACT_Hh_
#include "../matrix.h"
#include "structural_svm_problem_threaded_abstract.h"
#include <sstream>
#include "../image_processing/full_object_detection_abstract.h"
#include "../image_processing/box_overlap_testing.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
template <
typename image_scanner_type,
typename image_array_type
>
class structural_svm_object_detection_problem : public structural_svm_problem_threaded<matrix<double,0,1> >,
noncopyable
{
/*!
REQUIREMENTS ON image_scanner_type
image_scanner_type must be an implementation of
dlib/image_processing/scan_fhog_pyramid_abstract.h or
dlib/image_processing/scan_image_custom_abstract.h or
dlib/image_processing/scan_image_pyramid_abstract.h or
dlib/image_processing/scan_image_boxes_abstract.h
REQUIREMENTS ON image_array_type
image_array_type must be an implementation of dlib/array/array_kernel_abstract.h
and it must contain objects which can be accepted by image_scanner_type::load().
WHAT THIS OBJECT REPRESENTS
This object is a tool for learning the parameter vector needed to use a
scan_image_pyramid, scan_fhog_pyramid, scan_image_custom, or
scan_image_boxes object.
It learns the parameter vector by formulating the problem as a structural
SVM problem. The exact details of the method are described in the paper
Max-Margin Object Detection by Davis E. King (http://arxiv.org/abs/1502.00046).
!*/
public:
structural_svm_object_detection_problem(
const image_scanner_type& scanner,
const test_box_overlap& overlap_tester,
const bool auto_overlap_tester,
const image_array_type& images,
const std::vector<std::vector<full_object_detection> >& truth_object_detections,
const std::vector<std::vector<rectangle> >& ignore,
const test_box_overlap& ignore_overlap_tester,
unsigned long num_threads = 2
);
/*!
requires
- is_learning_problem(images, truth_object_detections)
- ignore.size() == images.size()
- scanner.get_num_detection_templates() > 0
- scanner.load(images[0]) must be a valid expression.
- for all valid i, j:
- truth_object_detections[i][j].num_parts() == scanner.get_num_movable_components_per_detection_template()
- all_parts_in_rect(truth_object_detections[i][j]) == true
ensures
- This object attempts to learn a mapping from the given images to the
object locations given in truth_object_detections. In particular, it
attempts to learn to predict truth_object_detections[i] based on
images[i]. Or in other words, this object can be used to learn a
parameter vector, w, such that an object_detector declared as:
object_detector<image_scanner_type> detector(scanner,get_overlap_tester(),w)
results in a detector object which attempts to compute the locations of
all the objects in truth_object_detections. So if you called
detector(images[i]) you would hopefully get a list of rectangles back
that had truth_object_detections[i].size() elements and contained exactly
the rectangles indicated by truth_object_detections[i].
- if (auto_overlap_tester == true) then
- #get_overlap_tester() == a test_box_overlap object that is configured
using the find_tight_overlap_tester() routine and the contents of
truth_object_detections.
- else
- #get_overlap_tester() == overlap_tester
- #get_match_eps() == 0.5
- This object will use num_threads threads during the optimization
procedure. You should set this parameter equal to the number of
available processing cores on your machine.
- #get_loss_per_missed_target() == 1
- #get_loss_per_false_alarm() == 1
- for all valid i:
- Within images[i] any detections that match against a rectangle in
ignore[i], according to ignore_overlap_tester, are ignored. That is,
the optimizer doesn't care if the detector outputs a detection that
matches any of the ignore rectangles or if it fails to output a
detection for an ignore rectangle. Therefore, if there are objects
in your dataset that you are unsure you want to detect or otherwise
don't care if the detector gets or doesn't then you can mark them
with ignore rectangles and the optimizer will simply ignore them.
!*/
test_box_overlap get_overlap_tester (
) const;
/*!
ensures
- returns the overlap tester used by this object.
!*/
void set_match_eps (
double eps
);
/*!
requires
- 0 < eps < 1
ensures
- #get_match_eps() == eps
!*/
double get_match_eps (
) const;
/*!
ensures
- returns the amount of alignment necessary for a detection to be considered
as matching with a ground truth rectangle. The precise formula for determining
if two rectangles match each other is the following, rectangles A and B match
if and only if:
A.intersect(B).area()/(A+B).area() > get_match_eps()
!*/
double get_loss_per_missed_target (
) const;
/*!
ensures
- returns the amount of loss experienced for failing to detect one of the
targets.
!*/
void set_loss_per_missed_target (
double loss
);
/*!
requires
- loss > 0
ensures
- #get_loss_per_missed_target() == loss
!*/
double get_loss_per_false_alarm (
) const;
/*!
ensures
- returns the amount of loss experienced for emitting a false alarm detection.
Or in other words, the loss for generating a detection that doesn't correspond
to one of the truth rectangles.
!*/
void set_loss_per_false_alarm (
double loss
);
/*!
requires
- loss > 0
ensures
- #get_loss_per_false_alarm() == loss
!*/
};
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_STRUCTURAL_SVM_ObJECT_DETECTION_PROBLEM_ABSTRACT_Hh_