Scientists have developed an innovative light-based technique to create secure, invisible watermarks that can be used to prevent photos, videos and books from being illegally copied and distributed. Imperceptibility is one of the most significant advantages of optical watermarking," said Shi. It is faster and uses a less complex optical setup than other optical watermarking approaches previously pursued, researchers said. Unlike other methods, SPE can encode the optical watermark in a single exposure with no mechanical scanning. Our experiment shows that our method is suitable for practical optical watermarking," said Shi.

Source: dna November 25, 2016 05:59 UTC