DWT

说明：  MATLAB用于图像或者信号压缩的程序，简单方便(MATLAB for image or signal compression procedures)

This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. (This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. )

automatic vehicle parking control system controls the door of parking area. and also it limits the number of vehicles automatically.

声音信号的功率谱分析。。。。。。。。。。。。。。(Spectral analysis of the power of the sound signal.)

为了验证PR控制器，加入了比例控制和谐振控制器功能性，对三次及技术次谐波对应控制其输出做出分析-(In order to verify the PR controller, the proportional control and the resonant controller functionality are added, and the output of the third and the technical sub-harmonics is controlled.)

用小波分析对所给图象进行增强处理,增强过后的效果明显(To will carry on enhancement processing with the wavelet analysis to the image, enhancement from now on effect is obvious )

汽车制动防抱死系统参数标定程序，用于分析汽车动力学特性，需要与carsim汽车仿真软件进行联合仿真，否则车辆模块出现badlink。(Automotive anti-lock braking system parameter calibration procedures for the analysis of vehicle dynamics, need with carsim automotive simulation software co-simulation, vehicle module badlink.)

高亮 Highcharts-4.0.3 Highcharts-4.0.3(high light)

北京大学 流形学习与稀疏表示 课程课件.(包括基本数学工具、黎曼几何、降维方法、稀疏表示等理论和编程方法）(Peking manifold learning courseware and sparse representation. (Including basic mathematical tools, Riemannian, dimension reduction methods, sparse representation theory and programming methods))

取音频左声道，并画出音频幅值频谱及频率能量图(Take the audio left channel, and draw the the audio amplitude spectrum and frequency energy diagram)