wnoise_xiaobobao

digital watermarking is a process by which a user-specified signal is hidden or embedded into another signal , for example digital content such as electronic documents, images, sounds and video [2]. The use of digital video applications such as video-conferencing, digital television, digital cinema, distance learning, videophone, and video-on-demand has grown very rapidly over the last few years. Today it is much easier for the digital data owners to transfer multimedia data over the internet, and hence the data could be perfectly duplicated and rapidly redistributed on a large scale. Thus, the importance of copyright protection for multimedia data has become more critical. Digital watermarking is an effective way to protect the copyright of multimedia data even after its transmission there is urgent demand for techniques to protect the original digital data and to prevent unauthorized duplication or tampering.

通信中的QPSK相位调制建摸，其中考虑了多径和高斯的影响(Communication QPSK modulation phase modeling, which takes into account the multi-path effects and Gaussian)

遗传算法（Genetic Algorithm）matlab工具箱，内含很多matlab例程，对于学习遗传算法很有帮助。(Genetic Algorithm (Genetic Algorithm) matlab toolbox, containing many matlab routines, useful for learning genetic algorithm.)

说明：  本文设计了一款人体行为异常监控系统，主要适用人群是老年人，在摄像头固定的情况下，自动检测人体运动轨迹，并与提前设定好的行为库进行匹配，分析判断是否具有异常行为。 在数字图像预处理部分采用了图像二值化，腐蚀与膨胀等几种方法为人体目标的跟踪和检测做准备。为了克服在实际操作中遇到的问题，采用了帧差法和ViBe算法，帧差法即利用帧间变化与当前帧、背景算法来判断它是否大于阈值，并分析视频中序列的运动特性，ViBe算法则是一种背景建模的方法，背景模型是由邻域像素来创建，并对比背景模型、当前输入像素值检测出前景，确定视频中的目标跟踪。在人体行为识别中，运动目标最小长宽比以及连续帧间的加速度来判断人体行为是否异常，如果检测到异常的行为比如说摔倒、快跑等行为，在识别的过程这种实时监测。不同环境可能需要调试，要求有一定编程基础，小白慎入。(In this paper, a monitoring system for abnormal human behavior is designed, which is mainly applicable to the elderly. When the camera is fixed, it can automatically detect the human motion track and match with the behavior database set in advance to analyze and judge whether there is abnormal behavior.)

一道matlab例题，适合初学者学习，内容仅供参考，如有更好的方法请推荐。(A matlab example, suitable for beginners to learn, is only for reference, if you recommend a better way.)

matlab仿真模型求解系统调节时间，上升时间以及超调量等(matlab simulation model to solve the system settling time, rise time and overshoot, etc.)

实现机器人避障功能，100个方格内可自己设置障碍区域，程序会自动寻找最短路径。另外附带试验参数(Robot obstacle avoidance function, 100 squares can set up their own regional barriers, the program will automatically find the shortest path. Also included with the test parameters)

its about quaternion formation

this code is to classify objects based on their roundness using bwboundaries, a boundary tracing routine.

Simplified model of induction motor and drive