Based on Freescale i.mx27 robot video surveillance system

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Robots represent the pinnacle of mechatronics and are a fusion of advanced technological products. They have found extensive applications across various fields. The development of robots can be characterized in two directions: horizontally, their application areas are expanding rapidly, moving beyond traditional industrial uses (which account for about 95%) to non-industrial sectors such as surgery, fruit picking, pruning, road excavation, inspection, and mine detection. Vertically, the variety of robots is increasing, with micro-robots capable of entering the human body, becoming a new frontier, some as small as a grain of rice. In certain industrial applications like exploration, disaster relief, alien detection, nuclear control, and surgical operations, video surveillance systems must be integrated with robots when real-time video recording and transmission are required. These systems typically consist of three main components: a real-time control system, a monitoring system, and a management information system. The real-time control system handles data acquisition, processing, storage, and upload. The monitoring system ensures all-weather monitoring at each point and allows simultaneous viewing of images from multiple locations. The management information system manages the storage, processing, and querying of various types of data. The robot-based video surveillance system using Freescale I.MX27 is an intelligent high-tech solution designed to meet urgent needs in robotic video monitoring. It consists of a server and terminal devices that work together to form a complete surveillance system. The terminal captures images, which are either connected via Ethernet or transmitted through 3G to the server. The server handles image display, storage, and processing. Advanced algorithms such as face recognition, fingerprint recognition, and medical image analysis can be implemented on the server side, enabling intelligent identification of captured images. The system block diagram is shown below:
The camera is installed in the monitored area and connects to the network via Ethernet or transmits data wirelessly through 3G to the monitoring center. Key functions of the video surveillance system include: 1. **Video Image Acquisition** The camera captures video, which is then compressed and encoded. High-definition cameras can achieve D1 resolution (720x576). Common compression formats include MPEG2, MPEG4, and H.264, with H.264 being widely used due to its high compression ratio, which reduces file size and increases transfer speed. The I.MX27 platform features hardware H.264 encoding, which does not consume CPU resources, improving efficiency and reducing power consumption. 2. **Local Storage and Upload** Captured images can be stored locally on an SD card or SATA hard drive, or uploaded directly to the server. The choice depends on user preferences and system configuration. Upload options include wired networks (RJ45, 10/100M Ethernet) or wireless 3G connections. However, 3G transmission speed may be limited by bandwidth, especially when transmitting D1@30fps video. 3. **Video Processing and Recognition** As robots are designed to replace human tasks, video surveillance systems play a crucial role in automating decision-making. Once video is sent to the monitoring center, it can be analyzed using pattern recognition algorithms. This enables computers to identify features and make automated decisions, significantly reducing manual labor. For example, automatic license plate recognition is widely used in transportation, while facial recognition is critical for security in banks. Fingerprint recognition is common in access control systems, leveraging the uniqueness of fingerprints for identification. These technologies are continuously evolving and will expand into more fields in the future. The I.MX27 CPU, running at 400MHz with an ARM926 core, offers high performance and versatility. It supports scalable local storage, acting as a digital video recorder. In case of network failure, video can still be saved locally, ensuring reliable monitoring. Its powerful yet low-power design makes it suitable for different environments, and it is ideal for high-definition video streaming and algorithm-intensive applications. Although the I.MX27-based robot video surveillance system may seem modest compared to others, we believe it has great potential. In the era of digitalization and networking, this small system will shine brightly, offering excellent performance and reliability.

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