## 4 Discussion  
As the proposed prototype solution is unique, the discussion aims to highlight the benefits for science and research and includes a proposal for future research. Among the benefits for science and research, several concepts for a prototype digitizing device can be proposed which are the result of a detailed analysis of the implementation of selected reverse engineering techniques. In this context, the selection of suitable hardware has been made within this research, and a design for the prototype digitization device has been proposed. One of the key aspects is the use of a projected laser pattern, which is used for explicit and accurate registration of common visual elements on the surface of the digitized object. Another important contribution of the work is the use of ESP32-CAM devices. These devices are beneficial because of their small size, relatively low cost, and low power consumption. These features allow for portability of the prototype digitizing device using external portable batteries. ESP32-CAM devices also allow for the replacement of optical sensors and lenses, the use of a flexible extension cable to connect the optical sensor to the motherboard, and the ability to connect to a computer using wireless technologies such as Bluetooth and Wi-Fi. Another advantage is the ability to connect multiple ESP32-CAM devices simultaneously without interfering with each other. As part of the work, physical models of the components of the prototype digitizing device assembly were created. FFF technology was used to produce them. This work also includes the design of software for calibrating the device and calculating coordinates for surface scanning for prototype digitization device with a custom digitization principle based on stereovision and the use of laser line projection. The basic principle of the mechanism of the prototype digitization device was the movement of a linear bearing along a guide rod. The guide rod was mounted in two single-row ball bearings. An arm holder was attached to the linear bearing. After calibration, manual sliding of the linear bearing by the user adjusted the device to the position for insertion into the confined space. In this position, the cameras are tilted. Once the device was positioned, the device was manually adjusted by the user to the first position, and digitizing was performed. In the  
Figure 11: Digitization of an automobile engine part. (**a**) Picture of pointing laser line by hand. (**b**) Resultant point cloud. digitizing process, a projected laser line was moved across the surface by rotating the guide rod. After a sufficient number of calibrations had been performed, the user confirmed the completion of the digitization process, and the result was a stored point cloud. The functionality of the prototype digitizing device was verified experimentally. The digitization of surfaces in hard-to-reach places was performed by digitizing the paper feeder within the printer and digitizing the surface in the engine compartment of an automobile. The digitization process was successful and resulted in a point cloud of the digitized area in hard-to-reach places. The main objective of the work can be considered to have been met. Subsequently, an experimental verification of functionality was conducted in the use of the prototype digitization device in the process of digitization of a part of the workbench in the laboratory and a part of the engine. These digitizations were successful, and thus, the use of the prototype digitizing device as an industrial scanner was verified. The free-hand orientation of the laser projector by the user was also verified successfully. Future research may be focused on improving the design and mechanism for better use in diagnostics of hard-to-reach areas, as well as on the use of stepper motors for automatic mechanism movements. Another aspect may be to reduce size and weight and increase accuracy, while reducing the digitization error rate through the use of prototype digitization equipment.