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// Copyright (C) 2017 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#include <dlib/python.h>
#include <dlib/matrix.h>
#include <dlib/dnn.h>
#include <dlib/image_transforms.h>
#include "indexing.h"
#include <pybind11/stl_bind.h>
using namespace dlib;
using namespace std;
namespace py = pybind11;
PYBIND11_MAKE_OPAQUE(std::vector<mmod_rect>);
PYBIND11_MAKE_OPAQUE(std::vector<std::vector<mmod_rect> >);
class cnn_face_detection_model_v1
{
public:
cnn_face_detection_model_v1(const std::string& model_filename)
{
deserialize(model_filename) >> net;
}
std::vector<mmod_rect> detect (
py::object pyimage,
const int upsample_num_times
)
{
pyramid_down<2> pyr;
std::vector<mmod_rect> rects;
// Copy the data into dlib based objects
matrix<rgb_pixel> image;
if (is_gray_python_image(pyimage))
assign_image(image, numpy_gray_image(pyimage));
else if (is_rgb_python_image(pyimage))
assign_image(image, numpy_rgb_image(pyimage));
else
throw dlib::error("Unsupported image type, must be 8bit gray or RGB image.");
// Upsampling the image will allow us to detect smaller faces but will cause the
// program to use more RAM and run longer.
unsigned int levels = upsample_num_times;
while (levels > 0)
{
levels--;
pyramid_up(image, pyr);
}
auto dets = net(image);
// Scale the detection locations back to the original image size
// if the image was upscaled.
for (auto&& d : dets) {
d.rect = pyr.rect_down(d.rect, upsample_num_times);
rects.push_back(d);
}
return rects;
}
std::vector<std::vector<mmod_rect> > detect_mult (
py::list& imgs,
const int upsample_num_times,
const int batch_size = 128
)
{
pyramid_down<2> pyr;
std::vector<matrix<rgb_pixel> > dimgs;
dimgs.reserve(len(imgs));
for(int i = 0; i < len(imgs); i++)
{
// Copy the data into dlib based objects
matrix<rgb_pixel> image;
py::object tmp = imgs[i].cast<py::object>();
if (is_gray_python_image(tmp))
assign_image(image, numpy_gray_image(tmp));
else if (is_rgb_python_image(tmp))
assign_image(image, numpy_rgb_image(tmp));
else
throw dlib::error("Unsupported image type, must be 8bit gray or RGB image.");
for(int i = 0; i < upsample_num_times; i++)
{
pyramid_up(image);
}
dimgs.push_back(image);
}
for(int i = 1; i < dimgs.size(); i++)
{
if
(
dimgs[i - 1].nc() != dimgs[i].nc() ||
dimgs[i - 1].nr() != dimgs[i].nr()
)
throw dlib::error("Images in list must all have the same dimensions.");
}
auto dets = net(dimgs, batch_size);
std::vector<std::vector<mmod_rect> > all_rects;
for(auto&& im_dets : dets)
{
std::vector<mmod_rect> rects;
rects.reserve(im_dets.size());
for (auto&& d : im_dets) {
d.rect = pyr.rect_down(d.rect, upsample_num_times);
rects.push_back(d);
}
all_rects.push_back(rects);
}
return all_rects;
}
private:
template <long num_filters, typename SUBNET> using con5d = con<num_filters,5,5,2,2,SUBNET>;
template <long num_filters, typename SUBNET> using con5 = con<num_filters,5,5,1,1,SUBNET>;
template <typename SUBNET> using downsampler = relu<affine<con5d<32, relu<affine<con5d<32, relu<affine<con5d<16,SUBNET>>>>>>>>>;
template <typename SUBNET> using rcon5 = relu<affine<con5<45,SUBNET>>>;
using net_type = loss_mmod<con<1,9,9,1,1,rcon5<rcon5<rcon5<downsampler<input_rgb_image_pyramid<pyramid_down<6>>>>>>>>;
net_type net;
};
// ----------------------------------------------------------------------------------------
void bind_cnn_face_detection(py::module& m)
{
{
py::class_<cnn_face_detection_model_v1>(m, "cnn_face_detection_model_v1", "This object detects human faces in an image. The constructor loads the face detection model from a file. You can download a pre-trained model from http://dlib.net/files/mmod_human_face_detector.dat.bz2.")
.def(py::init<std::string>())
.def(
"__call__",
&cnn_face_detection_model_v1::detect,
py::arg("img"), py::arg("upsample_num_times")=0,
"Find faces in an image using a deep learning model.\n\
- Upsamples the image upsample_num_times before running the face \n\
detector."
)
.def(
"__call__",
&cnn_face_detection_model_v1::detect_mult,
py::arg("imgs"), py::arg("upsample_num_times")=0, py::arg("batch_size")=128,
"takes a list of images as input returning a 2d list of mmod rectangles"
);
}
{
typedef mmod_rect type;
py::class_<type>(m, "mmod_rectangle", "Wrapper around a rectangle object and a detection confidence score.")
.def_readwrite("rect", &type::rect)
.def_readwrite("confidence", &type::detection_confidence);
}
{
typedef std::vector<mmod_rect> type;
py::bind_vector<type>(m, "mmod_rectangles", "An array of mmod rectangle objects.")
.def("extend", extend_vector_with_python_list<mmod_rect>);
}
{
typedef std::vector<std::vector<mmod_rect> > type;
py::bind_vector<type>(m, "mmod_rectangless", "A 2D array of mmod rectangle objects.")
.def("extend", extend_vector_with_python_list<std::vector<mmod_rect>>);
}
}