近年來，由於網際網路普及化，愈來愈多的消費者喜歡利用網路來購物，而電子商務的發展也逐漸變成各企業必要的競爭工具。然而，消費者由於網路的限制導致無法直視商品，使得這種消費方式僅僅是滿足了部份消費者的需求，加上大部份的消費者仍然喜歡感受到自己在購物的感覺，造成了虛擬商家無法完全取代真實的消費。為了讓消費者可以很輕鬆地在街上購物，我們提出了一種利用照相手機來消費的系統，並利用行動二維條碼為媒介，來做為一個與商家互動的應用。讓消費者只需要輕鬆地透過手機拍攝的動作，就能將商品輕鬆購入，並能隨時檢索到所需要的商品資訊，增加對商品內涵多一份的信任。
　　不同於傳統的條碼，我們採用了行動二維條碼做為主要的應用，並透過網頁伺服器及資料庫與3G系統做結合，實現了一個全新的消費模式。讓使用者可以在任何地方透過手機輕鬆消費，並結合協同過濾法的技術，分析每位消費者的個人偏好，為其建立一套專屬的個人化推薦機制，進而更容易找到自己可能需要的商品。由於商品上的條碼容易造成編碼圖形有所污損。因此，我們針對本系統中會用到的各種行動二維條碼圖形，進行某種程度上的容錯測試。依據事先所定義的標準，經由實驗來驗證系統的可行性。經測試証實，本系統所採用的條碼均能夠達到行動二維條碼錯誤修正等級30%的表現，其效果可實際應用於行動資訊環境。除此之外，我們更經由手機實際操作的測試，判斷系統在每一項功能的反應上，都能在預設10秒的標準內完成，並藉此證明系統的操作不會造成使用者的困擾。在這些基礎下，除了證明我們系統的可行性外，我們更希望能藉由手機的普遍性，有效率地提供各個使用者簡易的操作介面，進一步建立不同於以往的行動消費購物模式。

In recent years, more and more customers like to shop on the Internet. To attract more customers, it is necessary for the enterprises to develop electronic commerce. However, the current electronic commerce design can only meet some people’s requirement due to the lack of sufficient introductions to products. Besides, most customers still enjoy the eye-to-eye shopping experience and this is why the virtual firms cannot completely replace the real stores. To supplement the limited space in the catalogues, a new shopping system is designed for the cell phone subscribers. The proposed system is based on the QR Code technique. Customers only snapshot the pictures of QR Code and the products information can be easily browsed on the cell phone screen.
Since QR Code is different from the traditional barcode, we exploit it to embed in our design. Through linking the web server and the database to the 3G networks, the proposed concept will become a new shopping mode. Not only customers can use their own cell phones to shop everywhere but also the proposed system can provide personalized recommended product lists to customers with the implementation of the collaborative filtering method. The recommendation mechanism can help users find out the products that they may be interested in.
Since QR Code symbols are printed on the products the figures may be damaged easily. So we make some error tolerance experiments for the QR Codes that are used in the system. After doing the experiments, the QR Codes used in the system can reach the error correction level of 30% and thus can be used in a mobile environment. Moreover, we do some more experiments on the response time of designed functions. The results show that the response time is less than ten seconds.
The experimental results have verified the applicability of the proposed system. Our design can provide cell phone users an efficient shopping mode not the same as before.

ACKNOWLEDGMENTS ii
ENGLISH ABSTRACT iii
CHINESE ABSTRACT v
TABLE OF CONTENTS vi
LIST OF FIGURES viii
LIST OF TABLES x
CHAPTER 1 INTRODUCTION 1
1.1 Motivation 1
1.2 Objective 2
1.3 Method 3
1.4 Thesis Organization 4
CHAPTER 2 RELATED WORK 5
2.1 1D Barcode to 2D Barcode 5
2.2 2D Barcode 8
2.3 QR Code Overviews 14
2.4 QR Code Operations 18
2.5 Recommendation System 44
2.6 Personalized System 49
CHAPTER 3 SYSTEM IMPLEMENTATION 52
3.1 System Architecture 52
3.2 Development Environment 58
3.3 Function Implementation 59
CHAPTER 4 EXPERIMENTAL RESULTS AND DISCUSSIONS 69
4.1 QR Code Decode Test 69
4.2 System Security Discussions 77
4.3 System Constraint Discussions 81
CHAPTER 5 CONCLUSIONS AND FUTURE WORK 84
REFERENCES 87

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