The Implementation Of Underwater Video Control System Based On DirectShow

The Ocean with plenty of various resources owns the 70% of the earth is increasingly becoming the focus of competition。Currently, there is lack of detecting methods for multiple chemical ingredients analysis under different ocean circumstances, furthermore ,the development of deep-sea video and picture processing in our country is still in the first stage.In order to fulfill the request of Laser Raman spectrum analysis system and underwater detection platform ,it's essential to integrate underwater video control subsystem into the Raman Spectrum system as auxiliary means of dectecting seabed material and video capture for emitting chemical materials .The experiments on the underwater video collection are spited into two ,swallow-sea test and deep-sea experiment with respective demands ,that is ,data connection required between underwater and deck system while self-work for a time in deep-sea experiment.In the underwater system experiment, the underwater video system consisting of PC104 computer, USB collection card and Multi SeaCam underwater CCD camera with tolerance of high temperature and high pressure takes charge of capture of seabed environment video and pictures.Multi SeaCam underwater CCD camera conducts the collection of underwater video and tranforms the origin singal to television signal pattern in high temperature high pressure undersea environment,and then the Television signal is converted to digital video signal via USB collection card and ,finally ,transmitted to PC104 computer.The entire collection subsystem software platform based on Microsoft DirectShow SDK is developed by C# language in Visual Studio 2005 integrate developing environment .The video control software is executed after PC104 starts up according to the signal sended by Raman spectrum collection control system, and then captures the under water video and pictures automatically in response to timer event .Completing the collection ,the video data is transferred via communication bus to the control program on deck, or the entire device is retrieved from underwater on the purpose of the video data being checked by upper-end control software.The paper makes use of DirectShow SDK and Visual Studio 2005 IDE to complete the development of underwater video control subsystem which is testified to work stable and steadily through deep-sea environment experiments.