From ZDNet: "Microsoft, through a combination of efforts from the National Center for Missing and Exploited Children (NCMEC), their own dedicated Microsoft Research section and Dartmouth College, Hanover, a new next-generation technology is being launched with the aim of tacking online child abuse imagery.
Using PhotoDNA, the system picks out images which are identical, even if they have been edited, resized, cropped and edited in other ways, and logs them. The system matches them through a technique which monochromes the image, breaks the image into smaller chunks and the intensity gradients are converted into a signature.
The signatures, even through editing, will remain the same and allow the system to find copies of the original image. Some similarities could compare QR codes to this, allowing similar cells to match other images, allowing the system to recognise similar gradients and therefore image copies across massive sets of data."
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