基於視覺的移動車輛速度偵測嵌入式系統｜國立臺灣科技大學博碩士論文系統

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研究生：	張先道 Hsien-Tao Chang
論文名稱：	基於視覺的移動車輛速度偵測嵌入式系統 Vision-based Embedded System for Moving Vehicle Speed Detection
指導教授：	蘇順豐 Shun-Feng Su
口試委員:	蘇順豐 Shun-Feng Su 陳美勇 Mei-Yung Chen 蔡清池 Ching-Chih Tsai 莊鎮嘉 Chen-Chia Chuang 王乃堅 Nai-Jian Wang
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2022
畢業學年度：	110
語文別：	英文
論文頁數：	128
中文關鍵詞：	車輛偵測、車輛追蹤、光流、影像處理、嵌入式系統、即時處理
外文關鍵詞：	Vehicle Detection, Vehicle Tracking, Optical Flow, Image Processing, Embedded System, Real-time Processing
相關次數：	點閱：284 下載：21
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本研究的目的是實現一個基於視覺的嵌入式系統，此系統可以檢測機車後方移動車輛的移動速度，並且測量車輛的相對速度和位置，使得機車駕駛可以知道後方是否有危險車輛。本系統使用卷積神經網路偵測機車駕駛後方的車輛，並且提出了車頭擷取方法得到車輛的車頭部位來做為車輛追蹤的參考範圍。在車輛追蹤上，使用光流法來進行車輛追蹤。在量測後方來車與機車駕駛的相對速度上，基於相機焦距與車輛距離的關係來量測車輛與機車駕駛之間的相對速度。由於光流容易受到光線以及雜訊的影響，因此使用光流點的質心來增強光流點的穩定性，使得車輛測速具有穩健性。在光流離群值方面，由於影像金字塔具有線性比例放大的關係，每個光流點與光流點的質心之間的距離應為線性放大，若有光流點與光流質心之間的距離不為線性放大，表示此光流點為離群值。為了使整體的系統可以在嵌入式系統上達到即時影像運算，除了使用神經運算棒加速神經網路推理之外，也提出了非同步模式搭配光流法，使得神經網路推理的速度更快。在光流運算當中，利用任務優先級分配以及多執行緒來加速光流運算，使得整體的系統達到即時運算。使用白天的行車紀錄器影像測試本篇論文的系統之後，在平坦的道路上面所測出來的速度與實際速度的相對誤差為14.72%，將此系統移植到樹莓派上後，能夠平均以每秒30幀的幀率進行即時的後方來車測速。

This study is to implement a vision-based embedded system that can the moving speed of the moving vehicles from the rear side. The system can measure the relative speed and position of vehicles coming from behind so that the motorcyclist can know whether there is any dangerous vehicle. This system uses a convolutional neural network to detect vehicles behind the motorcyclist and a car front capture method is proposed to get the front end of vehicles for vehicle tracking. For vehicle tracking, optical flow is employed to track vehicles. In terms of vehicle speed measurement, the camera focal length and the distance of a vehicle are considered to measure the relative speed between the vehicle and the motorcyclist. Since optical flow is easily affected by light and noise, the stability of optical flow is strengthened by using the centroid of the optical flow points, which makes the vehicle speed measurement more robust. For the outliers of optical flow points, based on image pyramid, the distance between the centroid of the optical flow points and each optical flow point should be linearly enlarged. If not, it means that there are outliers in the optical flow points. In order to speed up the overall system, in addition to using neural compute stick to accelerate the CNN inference, an asynchronous mode with optical flow is proposed to make the CNN inference faster. In the optical flow calculation, using task priority assignment and multithreading to speed up the optical flow calculation so that the system can achieve real-time calculation. After using daytime dashcam videos to test the system, the relative error between the measured vehicle speeds and the actual vehicle speeds on flat roads is 14.72%. The system in this study is able to perform vehicle speed measurement at an average frame rate of 30 FPS on the Raspberry Pi.

中文摘要    I
Abstract    II
致謝    III
Table of Contents    IV
List of Figures    VII
List of Tables    XII
Chapter 1    Introduction    1
1    Background and Motivation    1
2    System Architecture    2
3    Thesis Contributions    3
4    Thesis Organization    7
Chapter 2    Related Work    8
1    Image Acquisition    8
2    Image Preprocessing    9
2.1 Grayscale Image Conversion    9
2.2 Image Filter    10
3    Camera Calibration    11
3.1 Image Distortion    11
3.2 Camera Calibration Method    13
4    Vehicle Distance Measurement    15
4.1 Coordinate Conversion    15
4.2 Vehicle Information Measurement    19
5    Vehicle Detection    21
5.1 Haar-like Feature    21
5.2 Background Subtraction    23
5.3 Convolutional Neural Network    24
6    Corner Detection    25
6.1 Harris Corner Detection    26
6.2 Shi–Tomasi Corner Detection    28
6.3 FAST Corner Detection    29
7    Object Tracking    30
7.1 Optical Flow    31
7.2 Feature Matching    33
Chapter 3    Vehicle Detection and Tracking    35
1   Vehicle Detection    35
1.1 Comparison of Vehicle Detection Methods    36
1.2 Car Front Capture Algorithm    39
1.3 Edge Detection of Vehicle    45
2    Vehicle Tracking    47
2.1 Comparison of Vehicle Tracking Methods    47
2.2 Corner Detection    49
2.3 Optical Flow Tracking    52
2.4 Light and Shadow    55
3    Objects of Optical Flow    56
3.1 Survival of Optical Flow Objects    57
3.2 Optical Flow Outliers    57
4    Vehicle Speed Measurement    59
4.1 Vehicle Coordinate System Speed Measurement    59
4.2 Focal Length Speed Measurement    61
4.3 Speed Measurement Problem    62
4.4 Centroid-based Speed Measurement    63
4.5 Vehicle Route Analysis    65
Chapter 4    Real-time Image Processing    68
1    Convolutional Neural Network Optimization    70
1.1 Intel Neural Compute stick 2    70
1.2 Asynchronous Mode with Optical Flow    73
2    Vehicle Object Optimization    75
2.1 Task Priority Assignment    75
2.2 Multithreading    77
2.3 Optical Flow Processing with Multithreading    78
Chapter 5    Experiments    81
1    Experimental Equipment    81
2    Comparison of speed measurement methods    84
2.1 Ideal Road    87
2.2 Non-ideal Road    91
2.3 Night Road    96
2.4 Summary of Speed Measurement Methods    99
3    Experimental Results    100
3.1 Vehicle Warning Functions    100
3.2 Optical Flow Outliers Deletion    103
3.3 Performance Evaluation on Raspberry Pi    105
Chapter 6    Conclusions and Future Work    107
1    Conclusions    107
2    Future Work    108
References    109

                                

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