JPEG descriptors - DCT
Color Layout Descriptor CLD - related to jpeg/mpeg...
Different scanning methods.. Zigzag scanning? Might matter!
Median descriptor -> Pearson code? up/down -> Local average
Color Histogram information ... Binning.. derived code
Invariance - some SIFT derived descriptor?
Combined descriptors

Experiments
	-Clear goals! -> finding near copies. dont expect too much.
	-Big test! automated
	-Finding near copies
		-Transformations per image (scaling, cropping, text, rotation, noise, contrast, brightness, JPEG compression)
		-Combinations of transformations
	-Modify images -> test for invariance
	-Keyword matching unlikely to work