// Copyright (C) 2016 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#undef DLIB_RaNDOM_CROPPER_ABSTRACT_H_
#ifdef DLIB_RaNDOM_CROPPER_ABSTRACT_H_
#include "../threads.h"
#include <mutex>
#include <vector>
#include "interpolation.h"
#include "../image_processing/full_object_detection.h"
#include "../rand.h"
namespace dlib
{
class random_cropper
{
/*!
WHAT THIS OBJECT REPRESENTS
This object is a tool for extracting random crops of objects from a set of
images. The crops are randomly jittered in scale, translation, and
rotation but more or less centered on objects specified by mmod_rect
objects.
THREAD SAFETY
It is safe for multiple threads to make concurrent calls to this object's
operator() methods.
!*/
public:
random_cropper (
);
/*!
ensures
- #get_chip_dims() == chip_dims(300,300)
- #get_randomly_flip() == true
- #get_max_rotation_degrees() == 30
- #get_min_object_height() == 0.25
- #get_max_object_height() == 0.7
- #get_background_crops_fraction() == 0.5
- #get_translate_amount() == 0.1
!*/
void set_seed (
time_t seed
);
/*!
ensures
- Seeds the internal random number generator with the given seed.
!*/
double get_translate_amount (
) const;
/*!
ensures
- When a box is cropped out, it will be randomly translated prior to
cropping by #get_translate_amount()*(the box's height) up or down and
#get_translate_amount()*(the box's width) left or right.
!*/
void set_translate_amount (
double value
);
/*!
requires
- value >= 0
ensures
- #get_translate_amount() == value
!*/
double get_background_crops_fraction (
) const;
/*!
ensures
- When making random crops, get_background_crops_fraction() fraction of
them will be from random background rather than being centered on some
object in the dataset.
!*/
void set_background_crops_fraction (
double value
);
/*!
requires
- 0 <= value < 1
ensures
- #get_background_crops_fraction() == value
!*/
const chip_dims& get_chip_dims(
) const;
/*!
ensures
- returns the dimensions of image chips produced by this object.
!*/
void set_chip_dims (
const chip_dims& dims
);
/*!
ensures
- #get_chip_dims() == dims
!*/
void set_chip_dims (
unsigned long rows,
unsigned long cols
);
/*!
ensures
- #get_chip_dims() == chip_dims(rows,cols)
!*/
bool get_randomly_flip (
) const;
/*!
ensures
- if this object will randomly mirror chips left to right.
!*/
void set_randomly_flip (
bool value
);
/*!
ensures
- #get_randomly_flip() == value
!*/
double get_max_rotation_degrees (
) const;
/*!
ensures
- When extracting an image chip, this object will pick a random rotation
in the range [-get_max_rotation_degrees(), get_max_rotation_degrees()]
and rotate the chip by that amount.
!*/
void set_max_rotation_degrees (
double value
);
/*!
ensures
- #get_max_rotation_degrees() == std::abs(value)
!*/
double get_min_object_height (
) const;
/*!
ensures
- When a chip is extracted around an object, the chip will be sized so that
the object's height is at least get_min_object_height() * 100 percent of the
chip height. E.g. if the chip is HEIGHT pixels tall then the object will
be at least HEIGHT*get_min_object_height() pixels tall. This also means
that if get_min_object_height() >1 then the object will be only partially
visible in the crop since it will be too big to fit.
!*/
void set_min_object_height (
double value
);
/*!
requires
- 0 < value
ensures
- #get_min_object_height() == value
!*/
double get_max_object_height (
) const;
/*!
ensures
- When a chip is extracted around an object, the chip will be sized so that
the object's height is at most get_max_object_height() * 100 percent of the
chip height. E.g. if the chip is HEIGHT pixels tall then the object will
be at most HEIGHT*get_max_object_height() pixels tall.
!*/
void set_max_object_height (
double value
);
/*!
requires
- 0 < value
ensures
- #get_max_object_height() == value
!*/
template <
typename array_type
>
void append (
size_t num_crops,
const array_type& images,
const std::vector<std::vector<mmod_rect>>& rects,
array_type& crops,
std::vector<std::vector<mmod_rect>>& crop_rects
);
/*!
requires
- images.size() == rects.size()
- crops.size() == crop_rects.size()
- for all valid i:
- images[i].size() != 0
- array_type is a type with an interface compatible with dlib::array or
std::vector and it must in turn contain image objects that implement the
interface defined in dlib/image_processing/generic_image.h
ensures
- Randomly extracts num_crops chips from images and appends them to the end
of crops. We also copy the object metadata for each extracted crop and
store it into #crop_rects. In particular, calling this function is the
same as making multiple calls to the version of operator() below that
outputs a single crop, except that append() will use multiple CPU cores
to do the processing and is therefore faster.
- #crops.size() == crops.size()+num_crops
- #crop_rects.size() == crop_rects.size()+num_crops
!*/
template <
typename array_type
>
void operator() (
size_t num_crops,
const array_type& images,
const std::vector<std::vector<mmod_rect>>& rects,
array_type& crops,
std::vector<std::vector<mmod_rect>>& crop_rects
);
/*!
requires
- images.size() == rects.size()
- for all valid i:
- images[i].size() != 0
- array_type is a type with an interface compatible with dlib::array or
std::vector and it must in turn contain image objects that implement the
interface defined in dlib/image_processing/generic_image.h
ensures
- Randomly extracts num_crops chips from images. We also copy the object
metadata for each extracted crop and store it into #crop_rects. In
particular, calling this function is the same as invoking the version of
operator() below multiple times, except that this version of operator()
will use multiple CPU cores to do the processing and is therefore faster.
- #crops.size() == num_crops
- #crop_rects.size() == num_crops
!*/
template <
typename array_type,
typename image_type
>
void operator() (
const array_type& images,
const std::vector<std::vector<mmod_rect>>& rects,
image_type& crop,
std::vector<mmod_rect>& crop_rects
);
/*!
requires
- images.size() == rects.size()
- for all valid i:
- images[i].size() != 0
- image_type == an image object that implements the interface defined in
dlib/image_processing/generic_image.h
- array_type is a type with an interface compatible with dlib::array or
std::vector and it must in turn contain image objects that implement the
interface defined in dlib/image_processing/generic_image.h
ensures
- Selects a random image and creates a random crop from it. Specifically,
we pick a random index IDX < images.size() and then execute
(*this)(images[IDX],rects[IDX],crop,crop_rects)
!*/
template <
typename image_type1,
typename image_type2
>
void operator() (
const image_type1& img,
const std::vector<mmod_rect>& rects,
image_type2& crop,
std::vector<mmod_rect>& crop_rects
);
/*!
requires
- img.size() != 0
- image_type1 == an image object that implements the interface defined in
dlib/image_processing/generic_image.h
- image_type2 == an image object that implements the interface defined in
dlib/image_processing/generic_image.h
ensures
- Extracts a random crop from img and copies over the mmod_rect objects in
rects to #crop_rects if they are contained inside the crop. Moreover,
rectangles are marked as ignore if they aren't completely contained
inside the crop.
- #crop_rects.size() <= rects.size()
!*/
};
}
#endif // DLIB_RaNDOM_CROPPER_ABSTRACT_H_