Image Linkage Capture System Design Based On DSP

With the mankind has entered the information era, a variety of information data play an increasingly important role in people’s life, especially the video image information obtained by the monitoring system is very important, so how to get image information more quickly and easily become an important research topic.In practical applications, there are some monitoring occasions, such as parking import and export, ATM self-service terminal, building elevator, will appear the phenomenon which has no monitoring object in a long time, the surveillance video obtained during this period is not only useless, but also need large memory.Moreover, like the ATM self-service terminal, since several directions need to be monitored at the same time, such as the slot, keyboard, money port and so on, the recording and testing of a single direction is difficult to achieve effective monitoring. Aimed at these monitoring features, a design thought of the image linkage capture system is proposed in this paper:System can be set to manual and automatic capture modes by the interface image displayed on the LCD. The image capture of the former is triggered by scanning the keyboard, and that of the latter is triggered by the signal send from the detector to ADSP-BF533via UART, such as infrared sensors of the apartment door, parking vehicle detectors and so on. The design of the system is as follows:1、The mode setting of system is based on the interface image of BMP format displayed on the LCD. In manual mode, the image capture is triggered by perssing the key; In automatic mode, the system can simultaneously receive multiplex detection signal. Therefore, the system can simultaneously capture multiple monitor orientation or object. As long as the signal arrives, the system identifies the packet and captures an image.2、Under the input of the CVBS signal source from an analog camera video, to achieve the complete collection, transmission, storage of one or several frames based on ADSP-BF533. Convert the input analog signal by Video Decoder chip ADV7183, and store the data flow to the SDRAM in the form of ITU-R656video via the PPI DMA interface of BF533.3、Carry on the JPEG compression processing to the original static images.Analyze the converted digital image format, and realize image compressed by the JPEG compression algorithm. Create the FAT32file system, and save the system monitor data JPEG images and TXT information files to the SD card.The system makes the video image acquisition, image compression, modules control, data storage integrate in an embedded system. Monitoring data obtained in this way will takes up less memory, and provides more state detection information, particularly suitable for the occasions which always appear the phenomenon which has no monitoring object in a long time, its simple operation, cost-effective, more flexible features have certain reference value.