Good for testing recognition algorithms. Computational Colour Constancy Data - A dataset oriented towards computational color constancy, but useful for computer vision in general. It includes synthetic data, camera sensor data, and over 700 images.
Most sets have a description file with names of objects in each image.
Digital Embryos - Digital embryos are novel objects which may be used to develop and test object recognition systems. They have an organic appearance. Ratings on emotion adjectives are also available, free of charge, for research purposes. Mammography Image Databases - 100 or more images of mammograms with ground truth. Additional images available by request, and links to several other mammography databases are provided.