## 2 Interactive Design Method of Digital Museum
### Augmented Reality Technology  
The Internet of Things collects information about objects through various information sensors, radio frequency identification, and other technologies, and realizes information exchange between objects or between objects and people with the help of the Internet [17]. Through the Internet of Things technology, the cultural exhibits, venue environment and  
Figure 1: Traditional museum visiting mode. intelligent equipment in the museum can be connected, and the museum information can be transformed digitally, so that people can quickly view the museum relics. Augmented reality technology is a branch of the Internet of Things, which is essentially a vision-based Internet of Things. Augmented reality can conduct virtual simulation of computer information, including image, video, text, and other information, and integrate virtual information with real scenes by using multimedia, 3D modeling, and intelligent sensing technologies [18; 19]. Augmented reality technology performs an important role in digital museums, which is conducive to the promotion and dissemination of cultural heritage. The process of applying augmented reality technology to digital museums is shown in Figure 2.  
In Figure 2, the process of applying augmented reality technology to the digital museum is described. The audience obtains the current environmental information in the real environment through sensory devices, such as mobile phones. According to the information received by the sensor, the virtual museum object can be constructed, and the virtual museum object can be combined with the real environment, so that the audience can interact with the museum. Applying augmented reality technology to digital museums can combine virtual museum objects with real environments and display them through intelligent devices. The digital museum applying augmented reality technology has the following characteristics: users can interact with the virtual and real environment in real time, use intelligent devices or adjust the camera angle to obtain different synthetic scenes, and improve the interaction between users and the museum. The scene synthesized by augmented reality technology is a three-dimensional matching mode, which can accurately overlap the museum exhibit information with the real environment, so that users can be in the scene. The integration of digital technology and traditional museums can improve the transmission effect of heritage culture, and the combination of augmented reality technology and museums can provide users with real-time interactive appreciation methods, helping users to understand heritage culture more systematically. It is the core of the whole technology to accurately combine the virtual museum exhibits with the real environment in the augmented reality technology. It is necessary to convert the coordinates of the virtual objects with the camera coordinates and pixel coordinates. Figure 2: The process of applying augmented reality technology to digital museums. If the user's world coordinate in the real scene is \((X_{a},Y_{a},Z_{a},1)\), the camera coordinate of the point is \((X_{b},Y_{b},Z_{b},1)\). The image coordinate obtained by the camera is \((X_{k},Y_{k},1)\), then the conversion process from world coordinate to camera coordinate is:  
\[ \begin{bmatrix}X_{b}\\ Y_{b}\\ Z_{b}\\ 1\end{bmatrix} =D \begin{bmatrix}X_{a}\\ Y_{a}\\ Z_{a}\\ 1\end{bmatrix}  \tag{1}\]  
In Formula (1), D represents the camera external parameter matrix. The conversion process from camera coordinates to image coordinates is as follows:  
\[Z_{b} \begin{bmatrix}X_{k}\\ Y_{k}\\ 1\end{bmatrix} = \begin{bmatrix}u\ 0\ 0\ 0\\ 0\ u\ 0\ 0\\ 0\ 0\ 1\ 0\end{bmatrix}\begin{bmatrix}X_{b}\\ Y_{b}\\ Z_{b}\\ 1\end{bmatrix}  \tag{2}\]  
In Formula (2), u represents the focal length of the camera. Since the pixel description is used for the imaging of virtual museum exhibits, the image coordinates are converted into pixel coordinates to obtain:  
\[ \begin{bmatrix}e\\ f\\ 1\end{bmatrix} =E \begin{bmatrix}X_{k}\\ Y_{k}\\ 1\end{bmatrix}