本文介绍了将Cimg转换为ITK的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图将Cimg图像转换为itk图像，以将其用于注册算法。 Cimg是一个RGB图像，我想将其转换为RGB itk图像。她是我的代码：
void Cimg_To_ITK（CImg< uchar> img）
{
$ b b const unsigned int Dimension = 2;
typedef itk :: RGBPixel< unsigned char> RGBPixelType;
typedef itk :: Image< RGBPixelType，Dimension> RGBImageType;
typedef itk :: ImportImageFilter< RGBPixelType，Dimension> ImportFilterType;
ImportFilterType :: Pointer importFilter = ImportFilterType :: New（）;
typedef itk :: ImageFileWriter< RGBImageType> WriterType;
WriterType :: Pointer writer = WriterType :: New（）;
RGBImageType :: SizeType imsize;
imsize [0] = img.width（）;
imsize [1] = img.height（）;
ImportFilterType :: IndexType start;
start.Fill（0）;
ImportFilterType :: RegionType region;
region.SetIndex（start）;
region.SetSize（imsize）;
importFilter-> SetRegion（region）;
const itk :: SpacePrecisionType origin [Dimension] = {0.0，0.0};
importFilter-> SetOrigin（origin）;
const itk :: SpacePrecisionType spacing [Dimension] = {1.0，1.0};
importFilter-> SetSpacing（spacing）;
const unsigned int numberOfPixels = imsize [0] * imsize [1];
const bool importImageFilterWillOwnTheBuffer = true;
RGBPixelType * localBuffer = new RGBPixelType [numberOfPixels];
RGBPixelType * it = localBuffer;
memcpy（* it，img.data（），numberOfPixels）;
importFilter-> SetImportPointer（localBuffer，numberOfPixels，importImageFilterWillOwnTheBuffer）;
writer-> SetFileName（output.png）;
}
我在编译时遇到此错误：
错误：无法将参数'1'的'RGBPixelType {aka itk :: RGBPixel}'转换为'void *'至'void * memcpy（void *，const void *，size_t）
有什么错误
解决方案
code>是一个 RGBPixelType ，它不能转换为void指针和 memcpy（）可以不处理它。 memcpy（）需要指向值的指针，例如 img.data（）或 it 。根据的文档：
如何从值缓冲区导入图像的示例由ITK 。我猜这是你的起点。
你会很快面临的另一个问题是图像的大小：RBG是每个像素3个字节，因此应该
memcpy（it，img.data（），numberOfPixels * 3）;
这是一个如何将unsigned char的缓冲区导入ITK RGB图像的示例，从你的代码。随意编辑此答案并添加处理CImg的函数。
#include< iostream>
#include< itkImage.h>
使用命名空间itk;
using namespace std;
#include< itkImportImageFilter.h>
#include< itkImageFileWriter.h>
void Cimg_To_ITK（unsigned char * data）
{
const unsigned int Dimension = 2;
typedef itk :: RGBPixel< unsigned char> RGBPixelType;
typedef itk :: Image< RGBPixelType，Dimension> RGBImageType;
typedef itk :: ImportImageFilter< RGBPixelType，Dimension> ImportFilterType;
ImportFilterType :: Pointer importFilter = ImportFilterType :: New（）;
typedef itk :: ImageFileWriter< RGBImageType> WriterType;
WriterType :: Pointer writer = WriterType :: New（）;
RGBImageType :: SizeType imsize;
// imsize [0] = img.width（）;
// imsize [1] = img.height（）;
imsize [0] = 100;
imsize [1] = 200;
ImportFilterType :: IndexType start;
start.Fill（0）;
ImportFilterType :: RegionType region;
region.SetIndex（start）;
region.SetSize（imsize）;
importFilter-> SetRegion（region）;
const itk :: SpacePrecisionType origin [Dimension] = {0.0，0.0};
importFilter-> SetOrigin（origin）;
const itk :: SpacePrecisionType spacing [Dimension] = {1.0，1.0};
importFilter-> SetSpacing（spacing）;
const unsigned int numberOfPixels = imsize [0] * imsize [1];
const bool importImageFilterWillOwnTheBuffer = true;
RGBPixelType * localBuffer = new RGBPixelType [numberOfPixels];
RGBPixelType * it = localBuffer;
memcpy（it，data，numberOfPixels * 3）;
//不需要删除localBuffer：itk会关心，因为importImageFilterWillOwnTheBuffer = true
importFilter-> SetImportPointer（localBuffer，numberOfPixels，importImageFilterWillOwnTheBuffer）;
writer-> SetFileName（output.png）;
writer-> SetInput（importFilter-> GetOutput（））;
writer-> Update（）;
}
int main（）
{
unsigned char * data = new unsigned char [100 * 200 * 3];
for（int i = 0; i for（int j = 0; j< 100; j ++）{
data [（i * 100 + j）* 3] = i;
data [（i * 100 + j）* 3 + 1] = 0;
data [（i * 100 + j）* 3 + 2] = j;
}
}
Cimg_To_ITK（data）;
delete [] data;
cout<<running fine<< endl;
return 0;
}
档案 CMakeLists.txt ：
<$ c $ p>
cmake_minimum_required（VERSION 2.8 FATAL_ERROR）
project（ItkTest）
find_package （ITK需求）
include（$ {ITK_USE_FILE}）
add_executable（MyTest main.cpp）
target_link_libraries（MyTest $ {ITK_LIBRARIES}）
安装ITK并设置环境变量 ITK_DIR 后，键入 cmake。和 make 构建此示例。
I'm trying to convert a Cimg image to itk image to use it for registration algorithm. The Cimg is a RGB image and i want to convert it to RGB itk image. Her is my code :
void Cimg_To_ITK (CImg<uchar> img)
{
const unsigned int Dimension = 2;
typedef itk::RGBPixel< unsigned char > RGBPixelType;
typedef itk::Image< RGBPixelType, Dimension > RGBImageType;
typedef itk::ImportImageFilter< RGBPixelType, Dimension > ImportFilterType;
ImportFilterType::Pointer importFilter = ImportFilterType::New();
typedef itk::ImageFileWriter< RGBImageType > WriterType;
WriterType::Pointer writer = WriterType::New();
RGBImageType::SizeType imsize;
imsize[0] = img.width();
imsize[1] = img.height();
ImportFilterType::IndexType start;
start.Fill( 0 );
ImportFilterType::RegionType region;
region.SetIndex( start );
region.SetSize( imsize );
importFilter->SetRegion( region );
const itk::SpacePrecisionType origin[ Dimension ] = { 0.0, 0.0 };
importFilter->SetOrigin( origin );
const itk::SpacePrecisionType spacing[ Dimension ] = { 1.0, 1.0 };
importFilter->SetSpacing( spacing );
const unsigned int numberOfPixels = imsize[0] * imsize[1];
const bool importImageFilterWillOwnTheBuffer = true;
RGBPixelType * localBuffer = new RGBPixelType[ numberOfPixels ];
RGBPixelType * it = localBuffer;
memcpy(*it, img.data(), numberOfPixels);
importFilter->SetImportPointer( localBuffer, numberOfPixels,importImageFilterWillOwnTheBuffer );
writer->SetFileName( "output.png" );
}
I get this error at compilation :
error: cannot convert 'RGBPixelType {aka itk::RGBPixel}' to 'void*' for argument '1' to 'void* memcpy(void*, const void*, size_t)
What is wrong??
解决方案
*it is a RGBPixelType, it can't be converted to a void pointer and memcpy() can't handle it. memcpy() needs pointers to values, such as img.data() or it. According to the documentation of CImg :
An example of how to import an image from a buffer of values is provided by ITK here . My guess is that it is your starting point.
The other issue that you will soon face is the size of the image : RBG is 3 bytes per pixel, so it should be
memcpy(it, img.data(), numberOfPixels*3);
Here is an example of how to import a buffer of unsigned char as an ITK RGB Image, starting from your code. Feel free to edit this answer and add the function to handle a CImg !
#include <iostream>
#include <itkImage.h>
using namespace itk;
using namespace std;
#include <itkImportImageFilter.h>
#include <itkImageFileWriter.h>
void Cimg_To_ITK (unsigned char* data)
{
const unsigned int Dimension = 2;
typedef itk::RGBPixel< unsigned char > RGBPixelType;
typedef itk::Image< RGBPixelType, Dimension > RGBImageType;
typedef itk::ImportImageFilter< RGBPixelType, Dimension > ImportFilterType;
ImportFilterType::Pointer importFilter = ImportFilterType::New();
typedef itk::ImageFileWriter< RGBImageType > WriterType;
WriterType::Pointer writer = WriterType::New();
RGBImageType::SizeType imsize;
// imsize[0] = img.width();
// imsize[1] = img.height();
imsize[0] = 100;
imsize[1] = 200;
ImportFilterType::IndexType start;
start.Fill( 0 );
ImportFilterType::RegionType region;
region.SetIndex( start );
region.SetSize( imsize );
importFilter->SetRegion( region );
const itk::SpacePrecisionType origin[ Dimension ] = { 0.0, 0.0 };
importFilter->SetOrigin( origin );
const itk::SpacePrecisionType spacing[ Dimension ] = { 1.0, 1.0 };
importFilter->SetSpacing( spacing );
const unsigned int numberOfPixels = imsize[0] * imsize[1];
const bool importImageFilterWillOwnTheBuffer = true;
RGBPixelType * localBuffer = new RGBPixelType[ numberOfPixels ];
RGBPixelType * it = localBuffer;
memcpy(it, data, numberOfPixels*3);
// no need to delete localBuffer : itk will care since importImageFilterWillOwnTheBuffer=true
importFilter->SetImportPointer( localBuffer, numberOfPixels,importImageFilterWillOwnTheBuffer );
writer->SetFileName( "output.png" );
writer->SetInput(importFilter->GetOutput() );
writer->Update();
}
int main()
{
unsigned char* data=new unsigned char[100*200*3];
for(int i=0;i<200;i++){
for(int j=0;j<100;j++){
data[(i*100+j)*3]=i;
data[(i*100+j)*3+1]=0;
data[(i*100+j)*3+2]=j;
}
}
Cimg_To_ITK (data);
delete[] data;
cout<<"running fine"<<endl;
return 0;
}
The file CMakeLists.txt :
cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
project(ItkTest)
find_package(ITK REQUIRED)
include(${ITK_USE_FILE})
add_executable(MyTest main.cpp)
target_link_libraries(MyTest ${ITK_LIBRARIES})
After installing ITK and setting the environment variable ITK_DIR, type cmake . and make to build this example.
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