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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkOpenCVImageBridge_h
#define itkOpenCVImageBridge_h
#include <string>
#include "itkImage.h"
#include "itkDefaultConvertPixelTraits.h"
#include "itkConvertPixelBuffer.h"
#include "cv.h"
#include "highgui.h"
namespace itk
{
/** \class OpenCVImageBridge
* \brief This class provides static methods to convert between OpenCV images
* and itk::Image
*
* This class provides methods for the following conversions:
* IplImage -> itk::Image
* cv::Mat -> itk::Image
* itk::Image -> IplImage
* itk::Image -> cv::Mat
*
* Each method is templated over the type of itk::Image used. The conversions
* copy the data and convert between types if necessary.
*
* \ingroup ITKVideoBridgeOpenCV
*/
class OpenCVImageBridge
{
public:
/** ITK stype typedefs */
typedef OpenCVImageBridge Self;
/** IplImage* -> itk::Image */
template<typename TOutputImageType>
static typename TOutputImageType::Pointer IplImageToITKImage(const IplImage* in);
/** cv::Mat -> itk::Image */
template<typename TOutputImageType>
static typename TOutputImageType::Pointer CVMatToITKImage(const cv::Mat & in);
/** itk::Image -> IplImage* */
template<typename TInputImageType>
static IplImage* ITKImageToIplImage(const TInputImageType* in, bool force3Channels = false);
/** itk::Image -> cv::Mat */
template<typename TInputImageType>
static cv::Mat ITKImageToCVMat(const TInputImageType* in, bool force3Channels = false);
private:
OpenCVImageBridge(const Self &) ITK_DELETE_FUNCTION;
void operator=(const Self &) ITK_DELETE_FUNCTION;
/** Steps involved in this method are:
1) Handle converting between colorspaces
2) Allocate the output image
3) Create a copy of the current IplImage's buffer without any padding
(slow but necessary)
4) Copy the buffer and convert the pixels if necessary */
template< typename TOutputImageType, typename TPixel >
static void ITKConvertIplImageBuffer( const IplImage* in,
TOutputImageType* out,
int iDepth )
{
// Typedefs
typedef TOutputImageType ImageType;
typedef typename ImageType::PixelType OutputPixelType;
typedef DefaultConvertPixelTraits<OutputPixelType> ConvertPixelTraits;
unsigned int inChannels = in->nChannels;
unsigned int outChannels = itk::NumericTraits<OutputPixelType>::MeasurementVectorType::Dimension;
// We only change current if it no longer points at in, so this is safe
IplImage* current = const_cast<IplImage*>(in);
bool isVectorImage(strcmp(out->GetNameOfClass(), "VectorImage") == 0);
bool freeCurrent = false;
if (inChannels == 3 && outChannels == 1)
{
current = cvCreateImage(cvSize(in->width, in->height), iDepth, 1);
cvCvtColor(in, current, CV_BGR2GRAY);
freeCurrent = true;
}
else if (inChannels == 1 && outChannels == 3)
{
current = cvCreateImage(cvSize(in->width, in->height), iDepth, 3);
cvCvtColor(in, current, CV_GRAY2RGB);
freeCurrent = true;
}
else if (inChannels == 3 && outChannels == 3)
{
current = cvCreateImage(cvSize(in->width, in->height), iDepth, 3);
cvCvtColor(in, current, CV_BGR2RGB);
freeCurrent = true;
}
else if (inChannels != 1 || outChannels != 1)
{
itkGenericExceptionMacro("Conversion from " << inChannels << " channels to "
<< outChannels << " channels is not supported");
}
typename ImageType::RegionType region;
typename ImageType::RegionType::SizeType size;
typename ImageType::RegionType::IndexType start;
typename ImageType::SpacingType spacing;
size.Fill( 1 );
size[0] = current->width;
size[1] = current->height;
start.Fill(0);
spacing.Fill(1);
region.SetSize(size);
region.SetIndex(start);
out->SetRegions(region);
out->SetSpacing(spacing);
out->Allocate();
size_t lineLength = current->width*current->nChannels;
void* unpaddedBuffer = reinterpret_cast< void* >(
new TPixel[current->height*lineLength]);
unsigned int paddedBufPos = 0;
unsigned int unpaddedBufPos = 0;
for (int i = 0; i < current->height; ++i)
{
memcpy(&(reinterpret_cast<TPixel*>(unpaddedBuffer)[unpaddedBufPos]),
reinterpret_cast<TPixel*>(current->imageData + paddedBufPos),
lineLength*sizeof(TPixel) );
paddedBufPos += current->widthStep;
unpaddedBufPos += lineLength;
}
if (isVectorImage)
{
ConvertPixelBuffer<TPixel, OutputPixelType, ConvertPixelTraits>
::ConvertVectorImage(static_cast< TPixel* >(unpaddedBuffer),
current->nChannels,
out->GetPixelContainer()->GetBufferPointer(),
out->GetPixelContainer()->Size());
}
else
{
ConvertPixelBuffer<TPixel, OutputPixelType, ConvertPixelTraits>
::Convert(static_cast< TPixel* >(unpaddedBuffer),
current->nChannels,
out->GetPixelContainer()->GetBufferPointer(),
out->GetPixelContainer()->Size());
}
delete[] reinterpret_cast<TPixel*>(unpaddedBuffer);
if (freeCurrent)
{
cvReleaseImage(¤t);
}
}
template< typename TPixel, unsigned int VDimension >
struct HandleRGBPixel
{
static void Padding( const Image< TPixel, VDimension >* itkNotUsed( in ),
IplImage* itkNotUsed( out ) )
{}
};
template< typename TValue, unsigned int VDimension >
struct HandleRGBPixel< RGBPixel< TValue >, VDimension >
{
typedef TValue ValueType;
typedef RGBPixel< ValueType > PixelType;
typedef Image< PixelType, VDimension > ImageType;
static void Padding( const ImageType* in, IplImage* out )
{
typename ImageType::IndexType pixelIndex = {{0,0}};
for( int r=0;r < out->height; r++ )
{
ValueType* ptr = reinterpret_cast< ValueType* >( out->imageData + r * out->widthStep );
for( int c=0;c < out->width; c++ )
{
pixelIndex[0] = c;
pixelIndex[1] = r;
typename ImageType::PixelType pixel = in->GetPixel(pixelIndex);
for( unsigned int i=0; i< 3; i++ )
{
*ptr++ = pixel[i];
}
}
}
}
};
}; // end class OpenCVImageBridge
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkOpenCVImageBridge.hxx"
#endif
#endif
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