转换Cimg成ITK

Question

我正在尝试将Cimg图像转换为itk图像以将其用于注册算法。 Cimg是RGB图像，我想将其转换为RGB itk图像。 她是我的密码：

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" );
}

我在编译时收到此错误：

错误：无法将参数'1'的'RGBPixelType {aka itk :: RGBPixel}'转换为'void *'到'void * memcpy（void *，const void *，size_t）

怎么了？？

Answer 1

*it是RGBPixelType ，不能将其转换为void指针，而memcpy()无法处理它。 memcpy()需要指向值的指针，例如img.data()或it 。 根据CImg的文档：

T* data ()返回指向第一个像素值的指针。

ITK 在此提供了一个如何从值缓冲区中导入图像的示例。 我的猜测是这是您的起点。

您即将面临的另一个问题是图像的大小：RBG是每个像素3个字节，因此应该是

memcpy(it, img.data(), numberOfPixels*3);

这是一个示例，该示例从代码开始，介绍如何将未签名的char缓冲区作为ITK RGB图像导入。 随时编辑此答案并添加处理CImg的功能！

#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;
}

文件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})

安装ITK并设置环境变量ITK_DIR ，键入cmake . 并make建立这个例子。