DVHop

Matlab source code for DCT-based watermarking for grayscale images. DCT-based watermark recovering without resorting to the uncorrupted original image. Digital watermarking has been proposed as a viable solution to the need of copyright protection and authentication of multimedia data in a networked environment, since it makes possible to identify the author, owner, distributor or authorized consumer of a document. A new watermarking technique to add a code to digital images is presented: the method operates in the frequency domain embedding a pseudo-random sequence of real numbers in a selected set of DCT coefficients. Watermark casting is performed by exploiting the masking characteristics of the Human Visual System, to ensure watermark invisibility. The embedded sequence is extracted without resorting to the original image, so that the proposed technique represents a major improvement to methods relying on the comparison between the watermarked and original images.

产生白噪声，并对白噪声进行fft，画出白噪声的频谱。(White noise and white noise fft, draw a white noise spectrum.)

markov2 program in matlab

UNSTAMPC Predictive Control of unstable system (Script file) Implements unconstrained MPC for unstable SISO discrete-time system defined as LTI object.

TextField.getDepth 返回文本域的Depth（深度） TextField.getNewTextFormat 获得最新加入文本的默认文本格式 TextField.removeTextField 删除使用MovieClip.createTextField创建的文本域 TextField.setNewTextFormat 对新加入的文本设定为新格式 (TextField. GetDepth returns the text field the Depth (Depth) TextField. Get the latest to join the text getNewTextFormat TextField. The default text format removeTextField delete using the MovieClip. CreateTextField created text field TextField. SetNewTextFormat for new text set to the new format)

digital signal processing code for fir filter

demo Optical communication in underwater spectrum

This topic presents a current blocking strategy of brushless DC (BLDC) motor drive to prolong the capacity voltage of batteries per charge in electric vehicle applications. The BLDC motor employs a simple torque hysteresis control (THC) that can offer a robust control and quick torque dynamic performance. At first, a mathematical modeling of BLDC motor and principle of torque hysteresis control will be described, so that the benefit offered by the proposed current blocking strategy can be highlighted. It can be shown that the current control method naturally provides current limitation, in which the current error (or ripple) is restricted within the pre-defined band-gap furthermore provide current protection. The benefit of proposed current blocking strategy will be highlighted such that it can prevent the current drained from the batteries when the torque demand is released to set to 0 Nm. The control scheme is validated and verified by the simulation and experimental results.

利用比尔萨法尔定理计算多个线框嵌套时的磁场分布(for calculating the magnetic distribution of multiple square wireframe)

Simple precoding and decomosition fuction