Example
In this example, the Wikipedia logo has been split into two shares. Each white pixel in the original logo is split into two of the same small blocks that have full black and white pixels. When these two blocks are overlaid, they align exactly, and so the result is a light-colored block (with half black and half white pixels). Each black pixel in the original logo is split into two complementary small blocks. When these two blocks are overlaid, the result is a completely black block.
If each pixel in the original image is split randomly into two shares as described above, the shares are correlated together and reveal the original image. Still, when each individual share is considered alone (i.e., when the other share is unknown), it is indistinguishable from a random pattern. Given only one share, a second share can be crafted to reveal any possible image; therefore, individual shares reveal no information about the original image.
Read more about this topic: Visual Cryptography
Famous quotes containing the word example:
“Our intellect is not the most subtle, the most powerful, the most appropriate, instrument for revealing the truth. It is life that, little by little, example by example, permits us to see that what is most important to our heart, or to our mind, is learned not by reasoning but through other agencies. Then it is that the intellect, observing their superiority, abdicates its control to them upon reasoned grounds and agrees to become their collaborator and lackey.”
—Marcel Proust (1871–1922)