|One line summary|| Duplicate images within a collection (set of images) or complex object (scanned book)
|Possible approaches|| Perceptual Image Difference utility
Maurice de Rooij has created an example PHP wrapper script using the Windows binary to iterate trough files in a single directory.
More about this wrapper script can be found @ Perceptual Image Diff comparison
pHash - open source perceptual hash library
NOT TESTED YET
Wavelet Scalar Quantization (WSQ)
TOO COMPLEX TO CREATE SIMPLE PROTOTYPE
Image To ASCII conversion (concept)
Convert image to 8 bits per pixel which leaves 256 possible values (0-255) per pixel.
If an ASCII character is assigned to each value it can be saved as a string.
Using full text search one could compare this saved string to other saved strings.
This approach would work well if the compared images are exactly the same and would not be usable if there is just ONE different pixel. If one is using a difference treshold this might work.
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