投影機系統中基於webcam的對焦與底色校正

本論文描述以OpenCV函式庫做為圖像分析運算的工具，搭配webcam作為輸入裝置，並在投影機系統上利用直流馬達實作投影鏡頭的轉動控制以達到對焦的目的，進而透過圖像分析運算取得牆面或投影目標物的底色顏色資訊以實現底色校正功能。實作中以UART所實現的控制命令提供了圖像分析程式與硬體之間溝通控制的管道，此命令介面允許系統可以即時改變投影機參數設定以及修改馬達驅動晶片參數。此外，藉由OpenCV的跨平台與強大的矩陣運算能力，實作的圖像分析工具與介面可以靈活的整合到各種系統與應用之中。

關鍵字

OpenCV ； webcam ；投影機系統；直流馬達；對焦；底色校正

並列摘要

This paper describes a tool that uses OpenCV and a webcam to analyze the image projection by a projector. The tool includes a DC motor which controls the rotation of the projection lens to achieve the purpose of focusing the lens and accordingly correct background color via analyzing the image captured from the wall or a projection target. Control command to UART implementation provides communication between the image analysis program and hardware control pipeline, this command interface allows the system to immediately change the parameters of the projector set up and modify the parameters of the motor driver chip. By way of the cross-platform and powerful matrix operations of OpenCV, the proposed image analysis tools and associated interfaces can be flexibly integrated into various system and application.

並列關鍵字

OpenCV ； webcam ； projector system ； DC Motor ； focus ； color correction

參考文獻

[1] Gary Bradski and Adrian Kaehler, Learning OpenCV:Computer Vision with the OpenCV Library, O’Reilly, 2008

[3] Z. Zhang, “A Flexible New Technique for Camera Calibration,” IEEE Trans. on Pattern Analysis and Machine Intelligence, vol. 22, no. 11, pp. 1330-1334, Nov. 2000

[5] Rafael C. Gonzalez and Richard E. Woods, Digital Image Processing, Prentice Hall, 2007

[8] A. Santos, C.O. Solórzano, J.J. Vaquero, J.M. Peña, N. Malpica and F. Pozo, “Evaluation of autofocus functions in molecular cytogenetic analysis,” Journal of Microscopy, Vol. 188, pp. 264-272, 1997

[11] K. Ohara and A. Kunzman, “Video processing technique for multimedia HDTV with digital micro-mirror array,” IEEE Trans. Consumer Electronic, vol. 45, no. 3, pp. 604- 610, Aug. 1999

國際替代計量

投影機系統中基於webcam的對焦與底色校正

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