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[Special Effects] 图像dct变换的程序 DL : 0: 对原始灰度图像 Lena_gray.bmp进行图像压缩实验 1．对此图进行 8×8 DCT 变换后，分别只保留 DC系数，以及保留前 4、8、16 个变换系数(DC＋AC) ，然后再分别进行 IDCT 变换，比较结果。 2．可以使用 Matlab - Image Processing Toolbox 中的函数实现。 -gray image of the original image compression Lena_gray.bmp an experiment. This diagram 8 8 DCT, the only difference reservations DC coefficient, and the preservation of the former 4, 8 or 16 DCT coefficients (DC + AC), and then separately IDCT transformation, the results of the comparison. 2. Using Matlab-Image Processing Toolbox to achieve the function.
Update : 2008-10-13 Size : 1.01kb Publisher : 朱晓路
[Special Effects] 图像dct变换的程序 DL : 0: 对原始灰度图像 Lena_gray.bmp进行图像压缩实验 1．对此图进行 8×8 DCT 变换后，分别只保留 DC系数，以及保留前 4、8、16 个变换系数(DC＋AC) ，然后再分别进行 IDCT 变换，比较结果。 2．可以使用 Matlab - Image Processing Toolbox 中的函数实现。 -gray image of the original image compression Lena_gray.bmp an experiment. This diagram 8 8 DCT, the only difference reservations DC coefficient, and the preservation of the former 4, 8 or 16 DCT coefficients (DC+ AC), and then separately IDCT transformation, the results of the comparison. 2. Using Matlab-Image Processing Toolbox to achieve the function.
Update : 2025-02-19 Size : 1kb Publisher : 朱晓路
[Mathimatics-Numerical algorithms] current_park DL : 0: 用C语言编写的在Simulink环境下对3相交流电机交直流帕克变换进行数值仿真的S函数源代码。特点：考虑到了便于在单片机中执行的特点，完全使用定点算法实现。在MATLAB中编译成动态链接库后就可在Simulink中使用。-C language in the Simulink environment for 3-phase AC and DC motor Parker transform few value of the S-function simulation source code. Features : Taking into account the ease of implementation of the microprocessor features full use of fixed-point algorithm. MATLAB compiled after the DLL can be used in Simulink.
Update : 2025-02-19 Size : 4kb Publisher : 孙萌
[Compress-Decompress algrithms] 3971017DCT DL : 0: 对原始灰度图像 Lena_gray.bmp进行图像压缩实验 1．对此图进行 8×8 DCT 变换后，分别只保留 DC系数，以及保留前 4、8、16 个变换系数(DC＋AC) ，然后再分别进行 IDCT 变换，比较结果。 2．可以使用 Matlab - Image Processing Toolbox 中的函数实现。-gray image of the original image compression Lena_gray.bmp an experiment. This diagram 8 8 DCT, the only difference reservations DC coefficient, and the preservation of the former 4, 8 or 16 DCT coefficients (DC+ AC), and then separately IDCT transformation, the results of the comparison. 2. Using Matlab-Image Processing Toolbox to achieve the function.
Update : 2025-02-19 Size : 3kb Publisher : 嘟嘟
[matlab] GCPPP DL : 2: Grid-connected distributed generation sources interfaced with voltage source inverters (VSIs) need to be disconnected the grid under: 1) excessive dc-link voltage 2) excessive ac currents and 3) loss of grid-voltage synchronization. In this paper, the control of single- and two-stage grid-connected VSIs in photovoltaic (PV) power plants is developed to address the issue of inverter disconnecting under various grid faults. Inverter control incorporates reactive power support in the case of voltage sags based on the grid codes’ (GCs) requirements to ride-through the faults and support the grid voltages. A case study of a 1-MW system simulated in MATLAB/Simulink software is used to illustrate the proposed control. Problems that may occur during grid faults along with associated remedies are discussed. The results presented illustrate the capability of the system to ride-through different types of grid faults.-Grid-connected distributed generation sources interfaced with voltage source inverters (VSIs) need to be disconnected the grid under: 1) excessive dc-link voltage 2) excessive ac currents and 3) loss of grid-voltage synchronization. In this paper, the control of single- and two-stage grid-connected VSIs in photovoltaic (PV) power plants is developed to address the issue of inverter disconnecting under various grid faults. Inverter control incorporates reactive power support in the case of voltage sags based on the grid codes’ (GCs) requirements to ride-through the faults and support the grid voltages. A case study of a 1-MW system simulated in MATLAB/Simulink software is used to illustrate the proposed control. Problems that may occur during grid faults along with associated remedies are discussed. The results presented illustrate the capability of the system to ride-through different types of grid faults.
Update : 2025-02-19 Size : 38kb Publisher : hari
[Other] danxiangqiaoshi DL : 0: 不控整流仿真 1.在MATLAB/Simulink中搭建单相桥式不控整流电路仿真模型； 2.仿真分析空载的直流电压波形、交流电流波形； 3.仿真分析带载的直流电压波形、交流电流波形； 4.选择合适的滤波电感电容参数，观察分析其对直流电压的抑制作用。（先完成2、3，再进行第4步）仿真参数：交流电压有效值220V，频率50Hz，R=50Ω(Uncontrolled rectification simulation 1. build a simulation module of single phase bridge type uncontrolled rectifier circuit in MATLAB/Simulink. Type; 2. simulation and analysis of no load DC voltage waveform and AC current waveform; 3. simulation and analysis of DC voltage waveform and AC current waveform are carried out. 4. select suitable filter inductance and capacitance parameters to observe and analyze the DC voltage. Inhibition. (2, 3, fourth steps) Simulation parameters: AC voltage effective value 220V, frequency 50Hz, R=50 ohm)
Update : 2025-02-19 Size : 15kb Publisher : ljzz