A Study of Dynamic Control Mechanism for Computer Screen Recording Applications

• Main Authors: Liou,Jiunyi, 劉俊毅
• Other Authors: Chang,Shinhung
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/96713749716823061719

碩士 === 輔仁大學 === 資訊工程學系 === 99 === Users need to record whole motions on their computer screens in many applications, such as distance learning, video/audio conference, cloud computing and remote control etc. This study integrates two technologies to record computer screen, periodically comparing two continuous screen image and inspecting window update event to extract screen updates. However, capturing whole screen utilizes too much system resource and the recoded screen data is usually large. Convesly, extracting screen updates by windows events utilizes less system resource,but not every screen update generates windows events. This study purposes a Sporadic Dynamic Algorithm (SDA ) to reduce the system resource by regulating these two technologies. Additionally, this study tests the effectireness of reducing CPU utilization with using SDA in 4 different applications, web browsing, text editing, slide presentation, and video playback. Experimental results show that the SDA mechanism reduces system workload, CPU utilization, by more than 40%. The improvements are significant.