DCT2D

The JPEG compression scheme is divided into the following stages: 1. Transform the image into an optimal color space. 2. Adjust Aspect Ratio 16:9 3. Digitization Scheme 4:2:0. 4. Apply a Discrete Cosine Transform (DCT) to blocks of pixels, thus removing redundant image data. 5. Quantize each block of DCT coefficients using weighting functions optimized for the human eye. 6. Encode the resulting coefficients (image data) using a Huffman variable word-length algorithm to remove redundancies in the coefficients. 7. Byte Stuffing. 8. Header JFIF 9. JPG Data Store

用粒子群算法实现的求函数最小值，代码简捷明了，适合刚接触粒子群算法的朋友(Minimum demand function with particle swarm algorithm, the code is simple and clear, for the fourth year Particle Swarm friends)

说明：  实现DPSK调制的详细过程，对学习很有帮助，必须顶(DPSK modulation to achieve the detailed process, helpful for learning to be top)

基于rosenstein法的混沌时间序列最大利亚普诺夫指数算法(Method based on chaotic time series rosenstein largest Liapunov exponent algorithm)

关于最优化方法的Matlab仿真程序，线搜索技术。(Matlab simulation program optimization method, line search technique.)

可以对数据进行双谱计算。适合对非平稳信号进行分析。(The data can be double-spectrum calculation. Suitable for non-stationary signal analysis.)

可以用Matlab画坐标系，使用比较方便。(Coordinate system using Matlab painting, more convenient to use.)

摘　要 文章以空间监控系统为背景,深入研究了JPEG图像压缩标准的实现方法,并基于FPGA对其进行了实现和优化。文中给出了详细的实现方法和优化过程,测试表明达到了很好的效果。 简单介绍了有损静态图像压缩当前有两种比较流行的标准JPEG和JPEG2000。说明了用JPEG方法压缩的原因。 介绍JPEG基本原理：JPEG对灰度图像的压缩处理过程主要包括:图像分割,离散余弦变换(DCT),量化(Quantization),“Z”形排序(Zigzag Scan),差分脉冲编码调制(Differential Pulse Code Modulation,DPCM)对直流系数(DC),行程长度编码(Run-Length Encoding,RLE)对交流系数(AC),霍夫曼(Huffman)编码等。 JPEG标准的特点是离散余弦变换。 比较详细介绍压缩系统的构成和实现。实现提及步骤， JPEG压缩模块设计和编码模块实现细节。 (Abstract Article in the space monitoring system for the background, in-depth study of the JPEG image compression standard implementation methods and carried out based on FPGA implementation and optimization. In this paper, a detailed method of implementation and optimization of the process, testing showed that to achieve good results. Easy introduction of harmful static image compression has two kinds of comparisons that the current popular standard JPEG and JPEG2000. Illustrated by the reasons for JPEG compression method. JPEG introduce the basic principles: JPEG compression of gray-scale image processing include: image segmentation, discrete cosine transform (DCT), quantization (Quantization), "Z"-shaped sort (Zigzag Scan), differential pulse code modulation (Differential Pulse Code Modulation, DPCM) on the DC coefficient (DC), Run Length Encoding (Run-Length Encoding, RLE) of the exchange coefficient (AC), Hoffman (Huffman) coding. JPEG standard is characterized by discrete )

说明：  一份详细的matlab手册，里面有关于matlab各个函数的详细介绍及例子(Matlab a detailed manual, which all function on matlab detailed introduction and examples)

自定义结构体 对照片的一些属性信息 进行赋值 并可以输出其值 可以扩展(set and input some information of attibute )