Identification of same image at different levels of rotation

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One line summary Duplicate images at different levels of rotation contained within collection
Detailed description Scanned images provided by third party over several accessions. Later accessions contain duplicate images at different levels of rotation (1-2% to left). Comparison of selected images suggest that the images are visually identical, suggesting that they originated from the same source and that a processor rotated the images at a later date. It would be helpful to identify such images across a large collection.
Issue champion Gareth Knight
Possible approaches Text OCR, Map objects to vector using ImageJ
Context Image Collection Context
AQuA Solutions Identifying rotated duplicate images using pHash
Collections East London Theatre Archive
image image Delete
issue issue Delete
duplication duplication Delete
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