1 #include "itkImage.h"
2 #include "itkImageFileReader.h"
3 //为了使用 itk::RGBPixel 类，包含头文件
4 #include "itkRGBPixel.h"
5 //在 ITK 中如何表示 RGB 图像。
6 int main( int , char * argv[] )
7 {
8 //RGBPixeld 类的使用是基于用来代表红、绿和蓝的像素成分的类型之上的
9 //定义RGBPixel类型的PixelType对象
10 typedef itk::RGBPixel< unsigned char > PixelType;
11 //然后将这个类型PixelType对象作为图像中的像素模板参数，得到ImageType对象
12 typedef itk::Image< PixelType, 3 > ImageType;
13 //使用itk::ImageFileReader 对象从文件中读取图像
14 typedef itk::ImageFileReader< ImageType > ReaderType;
15 //实例化ReaderType的读取对象reader
16 ReaderType::Pointer reader = ReaderType::New();
17 //设置RGB图像索引
18 const char * const filename = "789.jpg";
19 //图像读取
20 reader->SetFileName( filename );
21 reader->Update();
22 //reader读取到的图像数据输出到image
23 ImageType::Pointer image = reader->GetOutput();
24 const ImageType::IndexType pixelIndex = {{25,35,0}};
25
26 //使用 RGBPixel 类提供的方法来执行对像素色彩成分的访问
27 PixelType onePixel = image->GetPixel( pixelIndex );
28 PixelType::ValueType red = onePixel.GetRed();//提取红色部分
29 PixelType::ValueType green = onePixel.GetGreen();//提取绿色部分
30 PixelType::ValueType blue = onePixel.GetBlue();//提取蓝色部分
31 // Software Guide : EndCodeSnippet
32 std::cout << "method1" << std::endl;
33 std::cout << "Pixel values from GetRed,GetGreen,GetBlue:" << std::endl;
34 std::cout << "Red = "
35 << itk::NumericTraits<PixelType::ValueType>::PrintType(red)
36 << std::endl;
37 std::cout << "Green = "
38 << itk::NumericTraits<PixelType::ValueType>::PrintType(green)
39 << std::endl;
40 std::cout << "Blue = "
41 << itk::NumericTraits<PixelType::ValueType>::PrintType(blue)
42 << std::endl << std::endl;
43
44
45 //由于 itk::RGBPixel 从 itk::FixedArray 类继承了 [ ] 操作
46 //以下方法也可执行对像素色彩成分的访问
47 red = onePixel[0]; // extract Red component
48 green = onePixel[1]; // extract Green component
49 blue = onePixel[2]; // extract Blue component
50
51 std::cout << "method2" << std::endl;
52 std::cout << "Pixel values:" << std::endl;
53 std::cout << "Red = "
54 << itk::NumericTraits<PixelType::ValueType>::PrintType(red)
55 << std::endl;
56 std::cout << "Green = "
57 << itk::NumericTraits<PixelType::ValueType>::PrintType(green)
58 << std::endl;
59 std::cout << "Blue = "
60 << itk::NumericTraits<PixelType::ValueType>::PrintType(blue)
61 << std::endl;
62 return EXIT_SUCCESS;
63 }
