Grosse et al. introduce a dataset for evaluating intrinsic image algorithms consisting of 20 images, each containing a single object on black background. The dataset is available online: cs.toronto.edu/~rgrosse/intrinsic/. In addition, they evaluate several intrinsic image algorithms on this dataset - the python code is also available at the above page. A short script to run explicitly the Retinex-based algorithm can be found at GitHub.
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