原图

变换后图像
The first step is to read an image. In this case it shows a control unit in a manufacturing environment, see figure 6.4 on the left side. By applying a regiongrowing algorithm from the HALCON library the image is segmented into regions. Each region inside the resulting region array regs is now selected according to its size and its compactness. Each region of a size larger than 1000 pixels and of a compactness value smaller than 1.5 is appended to the region array rect. After the processing of the for loop only the regions showing on the right side of figure 6.4 are left.

Images

在Halcon中，矩阵叫做通道，一个图像可能由若干个通道组成。比如灰度图像由一个通道，而彩色图像由3个通道组成。通道的类型不仅仅是8位（btype），而且可以有其他类型（比如16 int2）以及实数类型。除了保存像素信息，每一个HALCON图像也存储所谓的domain,就是上面介绍的那种Region格式。region可以理解为感兴趣的区域，即ROI。一般除了些许异常外，halcon算子都运行在region上处理。这一点与sepera相同。

Image Objects

类HImage是所有继承的图像类的根类。通过使用HImage,所有不同的像素类型都可以被以统一的格式处理（多态性）。类HImage不是虚类，因此可以被实例化。如下列举了几个重要的成员函数：

几何运算
- HImage operator & (const HRegion ) const
裁剪图像的一部分区域，然后返回此部分的图像。同reduce_domain.
点评： 此函数设计的还是很好的，比较符合直觉。一幅图像与区域做&运算，就是获取共同的部分，也就是裁剪后的图像。

例3

#include "HalconCpp.h"
using namespace Halcon;
#include "HIOStream.h"
#if !defined(USE_IOSTREAM_H)
using namespace std;
#endif
void main()
{
    HImage   image("E:\\halcon\\images\\mreut.png");        // Aerial image
    HWindow  w;                                 // Output window
    image.Display(w);                           // Display image
    // Returning the size of the image
    cout << "width  = " << image.Width();
    cout << "height = " << image.Height() << endl;
    // Interactive drawing of a region by using the mouse 
    HRegion  mask = w.DrawRegion();
    // Reduce the domain of the image to the mask
    HImage   reduced = image & mask;
    w.ClearWindow();                            // Clear the window
    reduced.Display(w);                         // Display the reduced image
    // Applying the mean filter in the reduced image
    HImage   mean = reduced.MeanImage(61, 61);
    mean.Display(w);
    HRegion  reg = reduced <= (mean -3);
    reg.Display(w);
}