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matlab code to find wavelet compression of an image
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also using vector quantization on image by using matlab program to achieve a good compression ratio
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作业一
要求
用C语言或者VC，VB，Matlab或其他语言完成如下实验：
1）打开一个BMP文件
2）将其局部区域的灰度值进行改变
3）另存为一个新的BMP文件
要求显示出原BMP图像和新BMP图像。
作业二
要求
1. 编程实现图像傅立叶高通、低通滤波。
2. 尝试傅立叶压缩。
作业三
要求
编程实现图像DCT高通、低通滤波。并与傅里叶变换比较。
作业四
要求
找一幅曝光不足的灰度（或彩色）图像，按照直方图均衡化方法进行处
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压缩包内是一个word文档，文档里边包含了许多各种各样的matlab对图像的处理子程序-Compression package is a word document, the document inside contains a variety matlab image processing subroutine
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MATLAB通过DCT对图像进行区域编码以及门限编码压缩-MATLAB through the DCT to do image region code and threshold coding compression
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基于matlab的JPEG压缩源码，含压缩与解压缩，还有与原图的对比测试。-Matlab-based JPEG compression source, including compression and decompression, as well as comparison with the original image.
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图像处理MATLAB程序包括灰色二进制压缩和其他一些方法和其他一些
-MATLAB image processing procedures including gray binary compression
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此代码是对JPEG图像二次压缩所产生的JPEGGhost进行的Matlab仿真。适合图像取证初学者学习。-This code is a JPEG image generated by the secondary compression JPEGGhost Matlab simulation. Suitable for image forensics for beginners to learn.
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基于DWT的彩色图像数字水印的matlab实现水印的嵌入与提取，能抵抗噪声，剪切，压缩攻击-Based on DWT color image digital watermark matlab watermarking embedding and extracting, can resist noise, shear and compression attack
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基于DWT的彩色图像数字水印的matlab实现水印的嵌入与提取，并对其进行arnold置乱，能抵抗噪声，剪切，压缩攻击-Based on DWT color image digital watermark matlab watermarking embedding and extracting, and carries on the Arnold scrambling, can resist noise, shear and compression attack
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一个对于一维正弦信号的压缩感知恢复算法（正交匹配追踪发）的matlab程序，并绘出恢复图像对比原始图像，且计算出重构误差-A recovery image contrast for the one-dimensional sine signal compression the perceived recovery algorithm (orthogonal matching pursuit fat) matlab program, and draw the original image, and
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在数字图像处理中，运用MATLAB中的函数compare可以用来计算图像压缩前后的误差和直方图-In digital image processing using MATLAB functions compare the error and histogram can be used to calculate the image before and after compression
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对给定的图像矩阵进行哈夫曼编码，并用matlab实现，求出压缩前后的压缩比-Given image matrix Huffman coding, and using Matlab to achieve compression ratio obtained before and after compression
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1了解离散余弦正变换和逆变换的原理；
2理解离散余弦变换系数的特点；
3了解离散余弦变换在图像数据压缩中的应用；
4通过本实验掌握利用MATLAB编程实现数字图像的余弦变换；
-1 for the discrete cosine transform and inverse transform principle understand the characteristics of the discrete cosine transform coefficients 3 for
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对不同格式数字图像进行哈夫曼编码压缩，通过matlab软件仿真，最后得到了压缩图像，实现了本课题的基本要求。通过仿真得知哈夫曼编码为无损压缩。-Huffman coding digital image in a different format, by Matlab software emulation, finally got the compressed image, to achieve the basic requirements of this topic. Through simul
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根据JPEG压缩编码的基本压缩原理编写JPEG仿真程序，利用MATLAB软件对程序进行运行调试，验证了JPEG压缩编码算法的可行性。通过比对输出图像压缩前后实际效果，探讨压缩比，峰值信噪比等评价图像数据压缩程度及压缩质量的关键参数，对JPEG压缩编码算法的实用性和优越性进行了研究。- I have JPEG compression in-depth study on the basic principles of image data compression based on JPEG emul
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用matlab实现图像的DCT变换,将高频细节点忽略达到压缩的目的-Using matlab image DCT transformation, the high-frequency detail to achieve the purpose of compression point ignored
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本代码由matlab语言编写，实现了jpeg算法，主要为了说明基本的JPEG功能。经过DCT变化，量化，进行DPCM编码，然后之字形扫描AC系数，进行行程（LZW）编码。 显示原始图象和经编码解码后的图象，显示压缩比，并计算均方根误差。-The code consists of matlab language, to achieve a jpeg algorithm, mainly to illustrate the basic functionality of JPEG. After chan
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基于稀疏表示的正交最小二乘法，使用的语言是matlab，应用比较广阔，设计信号处理中的信号回归，图像处理的压缩等。-Sparse representation based on orthogonal least squares method, the language used is matlab, relatively broad application, design signal processing signal return, image processing, compression
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hufman
coding. Input QUALITY determines the amount of information that
is lost and compression achieved. Y is an encoding structure
containing fields:
Y.size Size of X
Y.numblocks Number of 8-by-8 encoded blocks
Y.qualit
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