Realization And Design Of Non-contact Energy Data Acquisition Terminal Based On V4L

Energy-efficient urban living energy systems can effectively alleviate the energy crisis, the reduction of environmental pressures, is an international study of a new energy-saving hot. China's urbanization process vigorously promote emission reduction and energy conservation work, there is an urgent need to meet China's national conditions of the urban energy system theory, methods, guidance and evaluation. Research on urban energy systems necessary to complete data analysis and scientific computing for the premise, but the residents of our country there is no systematic historical data on energy consumption per hour. Therefore, first of all research projects to develop embedded image acquisition system can capture an hour meter and gas meter, such as header and save the image to the hourly energy consumption data collection set up a database of energy consumption standards of living, so residents of China energy research consumption characteristics.The real-time video-acquiring presents developers with a wide range of requirements including increased processing performance,low power consumption,high I/O bandwidth for data acquisition,scalable storage capability,reliability,long-life support and standards-based connectivity.The wide range of ARM processors,whose characters are lower price,lower power consumption,easier development and higher processing performance,helps developers deliver the highest performance for the video acquisition system.S3C2410A is one of ARM chips.We choosed it as our processor of video-acquiring system because of its high ratio of performance to price,its high dependability and so on.Linux operating system is widely used in ARM application in virtue of its simply and high efficient kernel,abundant network performance and sustainment to many processors.It is possible to turn network video surveillance and visible phone to be real by making use of linux operating system,and get the video data in time is the necessary precondition.The embedded Linux is derived from the Linux families,which supports most kinds of embedded processors and takes a lot of advantages of UNIX.So it becomes the current essential embedded operation system.The research of"A Real-Time Video-Capturing System Designed Based on Embedded Linux"implements an intact and general embedded system development platform.It briefly introduces the system's realization scheme,then presents characteristic of the embedded system development.Based on this,the whole design is divided into hardware design and software design two parts. In hardware system design part,the ARM processors and S3C2410A MCU are introduced briefly,and then the paper explains especially the design of S3C2410A's interface with memory,including Nand Flash and SDRAM,RTC and USB camera.In software design part,the whole design is mainly included the presentation of discusses how to building embedded linux,mainly including the scheme of boot loader,the compiling and porting linux kernel,and how to driver USB digital camera under embedded linux.Then,this paper made a particular analysis of video collecting tech based on linux system,introduced using method of Video4Linux2 programming interface,At last,the main flow and key code of video acquisition were presented by USB camera capturing video signal.