Several image libraries for computer vision and digital image processing

How can no image library be used for digital image processing? Although you can build it on your own, if it is a well-known image library, the results of the experiment can be more convincing. Coral is very famous, but he charges fees. I have found some image libraries, some pure texture image libraries, such as the famous vistex, some faceimages, and some RGB true color images. Some URLs are listed below, and corresponding URLs can be found.
 
1. http://vismod.media.mit.edu/
This is a webpage of the Massachusetts media lab, which is still very successful in digital image processing. There will be a lot of useful things in download. For example, vistex or faceimages and others
 
2, http://www.dice.ucl.ac.be/mlg/index.php? Page = Databases
This is the database of UCL Machine Learning Group.
 
3. http://sipi.usc.edu/services/database/index.html
This is the famous USI-SIPI Image Database of the University of Southern California, with textures and true colors
 
4. http://www.cs.washington.edu/research/imagedatabase/
This is the ground truth database of the University of Washington. I use most of this image library, because currently there are a lot of true color images, but not a lot of pure textures. The images in this database are in RGB and JPEG format, which is very convenient for Matlab.
 
I have downloaded all the image libraries and the link is valid. Of course, I don't know when it will expire. In general, it should take a long time to keep it, because it's all about university research, and it's still necessary for future generations after the predecessors finish learning. Therefore, it has been half a year since I began to discover these libraries. Still retained.
Download the SDK as soon as possible.