在做图像处理的时候我们往往会使用Lena图像进行测试，但网上提供的测试图标准不一。这是Rice University提供的标准测试图，省去大家四处寻找之苦。另外，仔细阅读这个链接，你还会发现其他有用信息^.^

原文链接： http://www.ece.rice.edu/~wakin/images/

Wet Paint

This test image was taken by our group in Duncan Hall at Rice University. The Matlab file for the 1024x1024 image is here.

Lena/Lenna

There seem to be many versions of the Lena (aka "Lenna") test image available. This problem was noted by Shapiro in his 1993 zerotree paper, and it remains surprisingly true today. This web page is an attempt to clear up some of the confusion (and hopefully not add to it).

The files on this page are given in lossless compression formats. These can be imported into Matlab or opened using photo-editing software. The imread command in Matlab is often useful for importing files such as tiff or bmp. (You may need to convert the data to type double after loading it). For example:

lena512 = imread('lena512.bmp');
lena512 = double(lena512);

To write an image to a file, use imwrite:

imwrite(uint8(lena512),'lena512.bmp','bmp');

512x512 Color (24-bit)

This seems to be a pretty widely accepted standard, which originated from a scan of the published photograph (see The Lenna Story). This version is also provided at the USC-SIPI Image Database.

TIFF: lena512color.tiff (787kB)

512x512 Grayscale (8-bit)

There doesn't seem to be as much agreement on this version of the image. At some point, the original color image needed to be converted to grayscale. As Shapiro noted, options included taking only the green component of the RGB representation, or using a luminance-only version. You could also average the RGB components, etc.

I'm not sure how the following version was generated, but it is provided by the Image Communications Lab at UCLA (they apparently obtained it from RPI).

Each of the following files should contain the same information. If there is truly a standard version of the 512x512 Grayscale Lena, this seems to be it.

BMP: lena512.bmp (263kB)

PGM: lena512.pgm (262kB)

MATLAB: lena512.mat (262kB)

Comparing Different Versions

To illustrate the importance of using a standard version, let's look at a few different ones that are floating around. We'll compress each of them using a JPEG2000 coder (obtained from The JasPer Project).

You can see the Matlab versions of the images here. If you click on the following links, you can see standard jpg files. (These are just for viewing and comparision purposes - use the matlab files for experiments!)

Image 1 is the standard which is discussed in the above section. Image 2 is another version which I've seen, and it looks and behaves very similar to the standard. Image 3 is obtained by taking the green component from the 24-bit original (described above). It appears darker than the others, and it is harder to compress. Image 4 is yet another version that seems to be floating around. Visually it is very different from the others (it has less detail), and it is much easier to compress. Results are shown below.

标准Lena测试图像下载相关推荐

MATLAB经典测试图像集 Standard test image
Standard test image 介绍: 标准测试图像是一个数字图像的集合,各个机构使用该系列标准集去做图像处理测试,去验证图像压缩算法,通过 ...
运动目标检测、阴影检测及目标跟踪中用得到的标准测试视频下载
运动目标检测.阴影检测及目标跟踪中用得到的标准测试视频下载转载 2016年03月16日 09:53:28 标签: 目标跟踪 / 755
数字图像处理的常用测试图像（含Lena）
--坚持开源,拒绝收费图像数据库分享 http://www.imageprocessingplace.com/root_files_V3/image_databases.html 我把数字图像处理中 ...
测试Python下载图片的三种方法
简介: 通过Python软件包对网络URL图片链接进行下载,可以加快后期处理.本文测试了urllib, request两个软件包对图片进行下载效果.如果图片原网页有了防止下载机制,是无法下载图片. ...
linux+gps测试流程图,GPS测试标准与测试项目简介
正文 GPS测试标准与测试项目简介(2007/4/5 17:31) 国际辅助全球定位系统标准GPS测试标准有: UMTS / GSM: 3GPP TS 25.171 , 3GPP2 C.S0036- ...
数据恢复软件28款简单测试绿色下载
2006-8-30 9:34:31 数据恢复软件28款简单测试&绿色下载 http://www.linwan.com/archives/2179.html ps:这应该是"雨浪飘零& ...
STM32F103C8T6+无FIFO的OV7670的输出测试图像实例代码
一.工程文件链接及说明 Keil5工程文件: STM32连接OV7670的工程文件链接:https://pan.baidu.com/s/18td0AX0sOYzV7pidIf1B3w?pwd=767 ...
测试之Testin云测——标准兼容测试百度apk并生成相关测试报告
目录测试之使用Testin标准兼容测试软件并生成检测报告一.云测官网 https://www.testin.cn/ 1.1登录进去之后,点击标准兼容测试二.点击开始测试并上传一个要检测的apk( ...
STM32F103C8T6+带FIFO的OV7670的输出测试图像实例代码
一.工程文件链接及说明 Keil5工程文件: 链接:https://pan.baidu.com/s/13wCMPQU0DgbJ57sSiR16NQ?pwd=7670 提取码:7670 工程文件中,主要 ...
VoIP NGN IMS 3G 标准规范测试技术资料集合
推荐版块汇总『VoIP/NGN/IMS/FMC』技术资料下载 http://wellya.net/thread-htm-fid-13.html 『无线通信技术』技术资料下载 http://well ...

标准Lena测试图像下载