This paper mainly studies and designs an indoor autonomous tracking vehicle system based on FreeRTOS real-time operating system and UWB ultra-wideband ranging technology. The system integrates advanced wireless positioning technology and embedded control algorithm to achieve intelligent following function with high accuracy, low delay and strong robustness. Firstly, the characteristics and advantages of FreeRTOS are introduced, and how to apply it to the design of the car control system is described to meet the requirements of real-time control and ensure the stable and efficient operation of the system. Secondly, the principle of UWB ranging technology and its application in precise positioning are discussed. Combining the above two key technologies, a vehicle following strategy based on FreeRTOS and UWB ranging information was proposed. Using high-precision ranging capabilities and excellent task control capabilities, the vehicle can track the preset target object in real time and maintain a safe distance. Finally, the effectiveness and feasibility of the designed system are verified by experiments.
KEYWORDS: Digital watermarking, Digital imaging, Image processing, Image compression, Image encryption, Digital image processing, Information security, Computer security, Multimedia, Quantization
Through in-depth study of the existing discrete cosine transform (DCT) watermarking technology, this paper presents a double encryption watermarking algorithm to enhance the security of watermark information. In the watermark embedding stage presents a new adaptive blind watermarking algorithm based on DCT domain, to achieve binary watermark embedding after double encryption. This algorithm effectively reduces the complexity of the watermark extraction algorithm, and ensures the security of watermark while improving the invisibility, so it has a strong confidentiality, robustness and resistance to attack.
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