The USC-SIPI image database is a collection of digitized images, those images are used in many research articles, so you can compare your results, the link:

http://sipi.usc.edu/database/

my area only related to ocr

Please refer the following link

http://marathon.csee.usf.edu/range/DataBase.html

http://marathon.csee.usf.edu/range/DataBase.html

http://make3d.cs.cornell.edu/data.html

Hello,  you can use the Berkeley Dataset, with this option you have very much images with ground truth segmentations. Visit this links.

https://www.eecs.berkeley.edu/Research/Projects/CS/vision/bsds/

http://www.eecs.berkeley.edu/Research/Projects/CS/vision/grouping/resources.html

best regards

Sie können z.B. "The Berkeley Segmentation Dataset" benutzen o. selbst generieren. Es gibt verschiedene Ansätze.

Viele Grüße

@ ALL - Thank you :) 

I personally feel Berkeley dataset is superior.

https://www2.eecs.berkeley.edu/Research/Projects/CS/vision/bsds/