基于ARM和CPLD的视频信息采集系统

本文介绍了一种基于ARM和CPLD的视频信息采集系统。视频信息采集系统是多媒体传输系统中前端的处理部分,它负责把图像数据传感器采集的数据传给视频处理系统,其图像质量和传输速度至关重要。本文基于ARM和CPLD的视频采集信息采集系统基本满足视频处理的需要,达到预期目标。     

单目OV6620数字摄像头在视觉测距中的应用

单目摄像测距系统在对固定目标的测距中具有精确、灵敏的特点。介绍了使用OV6620数字摄像头借助激光三角测距法实现对目标物的测距原理及实现过程。通过试验证明,该系统在一定条件下可实现有效测距。     

基于嵌入式Linux的视频采集与传输系统的设计

介绍CMOS图像传感器OV9640的性能特点,系统的总体结构,以及S3C2440与OV9640的接口电路,详细阐述在嵌入式Linux下的OV9640驱动程序的编写方法,探讨在UDP协议下视频数据的网络传输的关键技术.实验及应用结果表明,在400 MHz的时钟频率下,QVGA图像可以达到20帧/s左右的采集速率.     

基于ARM7的汽车指纹识别系统设计

介绍了基于ARM7的指纹识别系统的软硬件设计及其在汽车中的应用,其中硬件主要是Samsung的ARM7处理器(S3C44B0X)以及相关的图像传感器OV7640,通过实际测试,该系统工作稳定可靠,达到了设计的目的.     

Tailoring surface defects in Plasma Electrolytic Oxidation (PEO) treated 2-D black TiO2: Post-treatment role,and intensification by peroxymonosulfate activation in visible light-driven photocatalysis

Herein, we have developed a visible light-responsive black TiO₂ photocatalytic coating with controlled formation of oxygen vacancies (OV) and Ti³⁺ species, crucial for enhancing photocatalytic reactions. The rational control of these semiconductor defects was achieved through plasma electrolytic oxidation (PEO), followed by NaOH post-treatment. The coating's effectiveness was evaluated by tetracycline (TC) degradation. The surface defects function as traps, reducing electron/hole recombination and forming mid-gap/localized-donor states, narrowing the band gap. Rigorous material characterization confirmed unaffected morphology and PEO coating phases, while increasing the density of OVs and Ti³⁺ species. As a result, TC photo-degradation was ∼3.5 times higher compared to plain PEO coatings. The material demonstrated exceptional stability and efficiency, while it was successfully intensified via peroxymonosulfate (PMS) activation, leading to high synergies (2.10). Scavenger tests revealed the existence of both radical/non-radical pathways, indicating the prevailing photocatalytic mechanism and the key differences achieved through this novel process.