無線影像傳輸系統設計

Wireless Image Transmission System Design

林定緯(Lin, Ting Wei)

指導教授 ： 盧志文

國立清華大學/原子科學院/工程與系統科學系/碩士(2015年)

https://doi.org/10.6843/NTHU.2015.00165

摘要

本論文所提出的無線影像傳輸系統，影像部份的規格參考第一顆商品化的無線膠囊內視鏡(Wireless Capsule Endoscopy ; WCE)的規格，透過撰寫軟體與韌體，達成系統的整合，實現無線影像傳輸。由於WCE在開發初期，也須透過模組間的整合以便就產品規格做考量，進而調整至最佳的配置參數，後續才有微型化的作業，因此本論文的研究可視作為WCE的前置開發階段。此外，也可以整合進其他需要影像即時性傳輸的應用。本論文的研究第一部份使用Arduino控制板，搭載了Atmel設計的ATmega328微控器，Arduino的優點是開放原始碼、軟硬體相關資源易取得、應用多元、價錢低，加上微控器可程式化，使得整個系統更有便利性、機動性、實用性，降低成本和應用廣泛性為主要考量。第二部分使用ArduCam相機擴充板，搭載了OmniVision Technologies生產的OV2640鏡頭模組，與Arduino擴充槽相容與模組化特性，使得鏡頭可便利操作，編寫一些程式碼即可使用，此外，擴充板具有frame緩衝與影像壓縮功能，能將拍攝的影像轉成JPEG格式。第三部分使用HC-05藍牙模組，藍牙有功耗與成本低、對人體危害小、配對容易等優點，透過藍牙傳輸特性，使用UART (Universal Asynchronous Receiver / Transmitter)通訊協定，建構無線路徑，將JPEG 影像資料傳輸到個人電腦端，並顯示在視窗程式上，進而達成無線影像傳輸。最後，整合相機擴充板、控制板、藍牙模組，順利實現無線影像傳輸系統，其影像方面的規格，解析度為320×240，frame rate為2.17fps。

關鍵字

Arduino ； 微控器 ； 藍牙 ； 開放原始碼 ； 影像傳輸 ； 無線膠囊內視鏡

並列摘要

The wireless image transmission system proposed in this thesis follows the specification of first commercialized wireless capsule endoscopy (WCE) in terms of image. The system can be integrated and fulfills wireless image transmission with proper coding. In the beginning of the development of WCE, modules integration is needed based on the product specification to get the best configuration parameter, and then miniaturization can be implemented. Therefore, the research can be seen as pre-development stage of WCE. Besides, it can also be integrated into other applications of real-time image transmission. First, Arduino board including the ATmega328 microcontroller designed by Atmel is used. The adoption of Arduino is because of its lower cost and wider applications. Second, ArduCam camera shield including OV2640 sensor manufactured by OmniVision Technologies is used. The shield with the functions of frame buffering and image compression can transform original image data to JPEG format. Third, a wireless transmission path by HC-05 bluetooth module is built. It can reach the wireless image transmission by transferring JPEG file to computer and image will be displayed on the Hyper-terminal software. Finally, the wireless image transmission system is formed by integrating the camera shield, control board, and bluetooth module. The specifications in terms of image such as resolution and frame rate are 320×240 and 2.17fps.

並列關鍵字

Arduino ； Microcontroller ； Bluetooth ； Open Source ； Image Transmission ； Wireless Capsule Endoscopy

參考文獻

[2] G. Pan, L. Wang, “Swallowable Wireless Capsule Endoscopy: Progress and Technical Challenges,” Review Article, 2012.

[4] Y. Gao, “An Asymmetrical QPSK/OOK Transceiver SoC and 15:1 JPEG Encoder IC for Multifunction Wireless Capsule Endoscopy,” IEEE Asian Solid-State Circuits Conference, Kobe, Japan, Nov. 2012.

[5] Y. Gao, “An Asymmetrical QPSK/OOK Transceiver SoC and 15:1 JPEG Encoder IC for Multifunction Wireless Capsule Endoscopy,” IEEE J. Solid-State Circuits, vol. 48, no. 11, pp. 2717 -2733, Nov. 2013.

[18] C. Garcia and G. Tziritas, “Face Detection Using Quantized Skin Color Regions Merging and Wavelet Packet Analysis,” IEEE Trans. on Multimedia, Vol. 1, No. 3, pp. 264-277, 1999.

[19] M. Turk and A. Pentland, “Eigenfaces for Recognition,” Journal of Cognitive Neuroscience, Vol. 3, No. 1, pp. 71-86, 1991.