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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|http://wiki.opf-labs.org/display/AQuA/Image+collection+context] |
| *AQuA Solutions* | [Identifying rotated duplicate images using pHash|http://wiki.opf-labs.org/display/AQuA/Identifying+rotated%2C+duplicate+images+using+pHash] |
| *Collections* | [AQuA:East London Theatre Archive] |