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/************************************************************************
*
* Copyright (C) 2009-2024 IRCAD France
* Copyright (C) 2012-2020 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#include "module/filter/image/threshold.hpp"
#include <core/com/signal.hxx>
#include <core/tools/dispatcher.hpp>
#include <data/image.hpp>
#include <data/image_series.hpp>
namespace sight::module::filter::image
{
//-----------------------------------------------------------------------------
threshold::threshold() noexcept :
filter(m_signals)
{
}
//-----------------------------------------------------------------------------
void threshold::starting()
{
}
//-----------------------------------------------------------------------------
void threshold::stopping()
{
m_target.reset();
}
//-----------------------------------------------------------------------------
void threshold::configuring()
{
const service::config_t& srv_config = this->get_config();
SIGHT_ASSERT("You must have one <config/> element.", srv_config.count("config") == 1);
const service::config_t& config = srv_config.get_child("config");
SIGHT_ASSERT("You must have one <threshold/> element.", config.count("threshold") == 1);
const service::config_t& threshold_cfg = config.get_child("threshold");
m_threshold = threshold_cfg.get_value<double>();
}
//-----------------------------------------------------------------------------
/**
* Functor to apply a threshold filter.
*
* The pixel with the value less than the threshold value will be set to 0, else the value is set to the maximum
* value of the image pixel type.
*
* The functor provides a template method operator(param) to apply the filter
*/
struct threshold_filter
{
struct parameter
{
double threshold_value {}; ///< threshold value.
data::image::csptr image_in; ///< image source
data::image::sptr image_out; ///< image target: contains the result of the filter
};
/**
* @brief Applies the filter
* @tparam PIXELTYPE image pixel type (uint8, uint16, int8, int16, float, double, ....)
*/
template<class PIXELTYPE>
void operator()(parameter& _param)
{
const auto threshold_value = static_cast<PIXELTYPE>(_param.threshold_value);
data::image::csptr image_in = _param.image_in;
data::image::sptr image_out = _param.image_out;
SIGHT_ASSERT("Sorry, image must be 3D", image_in->num_dimensions() == 3);
image_out->copy_information(image_in); // Copy image size, type... without copying the buffer
image_out->resize(image_out->size(), image_out->type(), image_out->pixel_format());
const auto lockin = image_in->dump_lock();
const auto lock_out = image_out->dump_lock();
// Get iterators on image buffers
auto it1 = image_in->begin<PIXELTYPE>();
const auto it1_end = image_in->end<PIXELTYPE>();
auto it2 = image_out->begin<PIXELTYPE>();
const auto it2_end = image_out->end<PIXELTYPE>();
const PIXELTYPE max_value = std::numeric_limits<PIXELTYPE>::max();
// Fill the target buffer considering the threshold
for( ; it1 != it1_end && it2 != it2_end ; ++it1, ++it2)
{
*it2 = (*it1 < threshold_value) ? 0 : max_value;
}
}
};
//-----------------------------------------------------------------------------
void threshold::updating()
{
threshold_filter::parameter param; // filter parameters: threshold value, image source, image target
// retrieve the input object
auto input = m_source.lock();
// try to dynamic cast to an image and an ImageSeries to know which type of data we use
data::image_series::csptr image_series_src =
std::dynamic_pointer_cast<const data::image_series>(input.get_shared());
data::image::csptr image_src = std::dynamic_pointer_cast<const data::image>(input.get_shared());
data::object::sptr output;
// Get source/target image
if(image_series_src)
{
param.image_in = image_series_src;
data::image_series::sptr image_series_dest = data::image_series::copy(image_series_src);
// define the input image series as the reference
image_series_dest->set_dicom_reference(image_series_src->get_dicom_reference());
// create the output image
data::image::sptr image_out = std::make_shared<data::image>();
image_series_dest->image::shallow_copy(image_out);
param.image_out = image_series_dest;
output = image_series_dest;
}
else if(image_src)
{
param.image_in = image_src;
// create the output image
data::image::sptr image_out = std::make_shared<data::image>();
param.image_out = image_out;
output = image_out;
}
else
{
SIGHT_THROW("Wrong type: source type must be an ImageSeries or an image");
}
param.threshold_value = m_threshold;
// get image type
core::type type = param.image_in->type();
/* The dispatcher allows to apply the filter on any type of image.
* It invokes the template functor ThresholdFilter using the image type.
* - template parameters:
* - core::tools::supported_dispatcher_types defined all the supported type of the functor, here all the type
* supported by core::type(std::int8_t, std::uint8_t, std::int16_t, std::uint16_t, std::int32_t,
* std::uint32_t, std::int64_t, std::uint64_t, float, double)
* - ThresholdFilter: functor struct or class
* - parameters:
* - type: core::type of the image
* - param: struct containing the functor parameters (here the input and output images and the threshold value)
*/
core::tools::dispatcher<core::tools::supported_dispatcher_types, threshold_filter>::invoke(type, param);
// register the output image to be accesible by the other service from the XML configuration
m_target = output;
}
//-----------------------------------------------------------------------------
} // namespace sight::module::filter::image
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