# Title Team Members TA Documents Sponsor
9 Image acquisition, 3D reconstruction and a visual interactive digital heritage system
Chuanrui Chen
Denglin Cheng
Qianyan Shen
Ziying Li
Shurun Tan
Spring 2024 ECE445 RFA

Image acquisition, 3D reconstruction and a visual interactive digital heritage system


- Qianyan Shen (qianyan2)

- Ziying Li (ziyingl4)

- Chuanrui Chen (cc86)

- Denglin Cheng (denglin3)

# Problem

Cultural artifacts possess significant historical, cultural, and artistic value. However, due to the passage of time and the impact of natural deterioration, many artifacts face risks of damage, loss, or decay. Additionally, for history enthusiasts and researchers worldwide, detailed information about specific artifacts is not readily accessible.

Traditional photographs often fail to capture the intricate details of artifacts, hampering comprehensive research and preservation efforts. Furthermore, the absence of user-friendly interactive interfaces limits the interaction between enthusiasts and artifacts, impeding immersive experiences in virtual exploration of cultural heritage.

Therefore, our team aims to develop a system that can generate realistic 3D models of cultural artifacts and provide users with a user-friendly interactive interface for immersive exploration.

# Solution Overview

Our system will use advanced scanning and 3D reconstruction techniques to capture the detailed geometry of cultural artifacts. This will be achieved through a series of subsystems including a Stabilized Scanning Subsystem, 3D Reconstruction Subsystem, Database Subsystem, and Interactive Interface Subsystem. Please refer to the following subsystem descriptions for more detailed information.

# Solution Components

## Stabilized Scanning Subsystem
This subsystem aims to capture detailed 3D data of the workpiece with high precision and low noise by coordinating a self-stabilizing three-axis gimbal centered around the STM32 microcontroller.
We intend to use solidworks to build the three axis parts of the gimbal respectively, and print them out with a high-precision 3D printer, and then use the brushless motor to connect these parts, and control them with the STM32 code, so that it can achieve real-time angular correction, so that in the process of scanning can be done to achieve the lens anti-shake, reduce motion blur.

## 3D Reconstruction Subsystem
This subsystem aims to obtain a point cloud through RGBD images and perform 3D reconstruction using the point cloud.
We first use a depth camera to capture RGBD images of an object from different angles and preprocess the raw images by denoising and repairing. Then, we proceed with point cloud acquisition, registration, and reconstruction to obtain a 3D model.
To begin, we calibrate the camera to obtain the lens parameters. We then convert the 2D coordinate system of the depth image to a 3D point cloud and map the pixel colors from the RGB image to the 3D point cloud. Afterward, we process the obtained point cloud by applying denoising and sampling techniques, facilitating subsequent registration and reconstruction steps. By repeating these processes, we obtain point clouds from different angles, and we perform precise registration using the ICP (Iterative Closest Point) method to align them in a unified coordinate system. Finally, the 3D reconstruction is completed using the Poisson reconstruction algorithm or other techniques.

## Database Subsystem
This subsystem aims to store the basic information of the artifacts, including dynasties, historical backgrounds, stories, etc., and at the same time saving the generated complex 3D model data.
With database system, users can upload the information of artifacts from all over the world to the database, and can also retrive and view the artifacts from exotic countries. When a user wants to retrieve an artifact, the database will find the corresponding information from its own stored data according to the search item entered by the user and display it through the Interactive Interface Subsystem for users to view artifacts from around the globe.

## Interactive Interface Subsystem
This subsystem aims to provide a user-friendly interface that facilitates database interaction and basic visualization capabilities, delivering a visually pleasing experience to users and catering to their close-range viewing needs.

We aim to present brief introductions of multiple cultural artifacts on the interface, including physical photos, names, dynasties, and more. Upon selection, users can access the corresponding detailed information and the reconstructed 3D model by linking to the database. Specifically, we render the obtained 3D models and offer features such as rotation and scaling for users to observe the artifact's details. Additionally, the interface can include a filtering function to provide users with a certain degree of personalized service in selecting artifacts.

# Criterion for Success
Successfully captures information about the appearance of artifacts without requiring the user to manually adjust examples or angles to minimize the noise.
Accurate and detailed 3D scanning and reconstruction of artifacts.
A database subsystem for effective data management and data retrieval.
A user-friendly interactive interface provides an immersive experience in cultural heritage exploration.

# Divisions Of Labor And Responsibilities
Denglin Cheng is responsible for the modeling of the Stabilized Scanning Subsystem, 3D printing, and the design of the control circuits in the STM32, as well as the final assembly and debugging of the gimbal to ensure smooth scanning of the depth camera.

Qianyan Shen is responsible for RGBD image preprocessing, point cloud acquisition, alignment, and 3D reconstruction.

Ziying Li is responsible for enabling database system to store and retrive data and interact with front-end.

Chuanrui Chen is responsible for the specific design and implementation of the UI interface, requiring her to understand and utilize the database interface. She also assists in the acquisition of point clouds from RGBD images and the design of the control circuits in the STM32.

Mimicry Stage Lighting Control System

Haozhe Chen, Ruiqi Li, Anqi Tan, Zhaohua Yang

Featured Project

This project aims to build a mimicry stage lighting control system. Generally speaking, the direction control system (usually a robot arm) will imitate the movements of the operator's arms so that the direction of the light can be controlled arbitrarily. In addition, the color of the light array can be determined by either the operator or the inherent information extracted from the music that is being played. Also, the whole system can be built in small size and can be installed easily, so that it can be deployed in scenarios like home parties.

More specifically, an operator (mostly a presenter or DJ) holds (or wears) a control device, the joystick, in each hand. The joysticks track the movement of each arm and transmit the direction information to the central server. This information is then processed and redirected to the mounted projector light arrays to control the actual direction of beams. Each hand controls each side of the lighting array. The system can also memorize a period of movement and playback. Besides, the color of the lights can be manually determined or be automatically determined by the rhythm or tempo of the music being played. The movement of the light gimbal can even be determined by the inherent feature of music.

Project Videos