Project

# 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
 design_document1.pdf
design_document2.pdf
proposal1.pdf
 Shurun Tan
Spring 2024 ECE445 RFA

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

# TEAM MEMBERS:

- 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.




Digital Controlled LED Rotating Display System

Guanshujie Fu, Yichi Jin, Keyi Shen, Chentai Yuan

Featured Project

# TEAM MEMBERS

Chentai Yuan (chentai2)

Guanshujie Fu (gf9)

Keyi Shen (keyis2)

Yichi Jin (yichij2)

# TITLE OF THE PROJECT

Digital Controlled LED Rotating Display System

# PROBLEM

By visual persistence phenomenon, we can display any images and strings with a rotating LED array. Many devices based on this idea have been developed. However, there are some common issues to be solved. First, the images or strings to be displayed are pre-defined and cannot be changed in a real-time way. Second, the wired connection between some components may limit the rotation behavior, and harm the quality of display. Some economical wireless communication technologies and new ways to connect components can be applied to achieve a better display and real-time image update.

# SOLUTION OVERVIEW

We aim at developing a digital controlled LED rotating display system. A servo motor is controlled to drive the stick with one row of LED to do circular rotation. The connection between LEDs, control circuit, motor and other components should be simple but firm enough to suppose good display and high-speed rotation. Moreover, there is another part to handle users’ input and communicate with the display part via Bluetooth to update images in a real-time and wireless way.

# SOLUTION COMPONENTS

## Subsystem1: Display Subsystem

- LED Array that can display specific patterns.

- Controller and other components that can timely turn the status of LEDs to form aimed patterns.

## Subsystem2: Drive Subsystem

- Servo motor that drive of the LED array to do circular rotation.

- Controller that communicates with the motor to achieve precise rotation and position control.

- An outer shell that has mechanisms to fix the motor and LED array.

## Subsystem3: Logic and Interface Subsystem

- Input peripherals like keyboard to receive users’ input.

- A FPGA board for high-level logics to handle input, give output and communicate with other subsystems.

- Wireless communication protocol like Bluetooth used in communication.

- VGA display hardware offering Graphical User Interface.

# CRITERION OF SUCCESS

- Users can successfully recognize the real-time patterns to be displayed.

- It achieves the precise rotation and position control of motor.

- The motor can drive the LED array and any necessary components to rotate stably and safely.

- The LED array is under real-time control and responds rapidly.

- The communication between components has low latency and enough bandwidth.

# DISTRIBUTION OF WORK

- Chentai Yuan(ME): Mechanisms and servo motor control.

- Guanshujie Fu(CompE): Logic and Interface design and keyboard & VGA display implementation.

- Keyi Shen(EE): Wireless communication and servo motor control.

- Yichi Jin(EE): Circuit design, keyboard & VGA display implementation.