Hybrid images: Now you see them…

日期:2019-03-01 04:03:09 作者:扈恋 阅读:

By Gregory T. Huang Click on the top right image and take a good look – what do you see? Close up it is clearly a faintly phantom-like image of Albert Einstein. Now step back 5 metres from the screen and take another look. Notice anything different? It’s not just a crafty illusion. This sort of image is being used as a tool to understand better how our brains process visual scenes. On the practical side, some companies are interested in using them to conceal information from unintended observers – or to create printed advertising that morphs before your eyes. “Hybrid images could be used in advertising, and to safeguard private information from prying eyes” The idea behind hybrid images is not new. For decades artists have been creating works that look different depending on how they are viewed, such as Salvador Dali’s 1940 painting Slave Market with the Disappearing Bust of Voltaire. Computer-generated hybrid images date back to the mid-1990s when neuroscientists Aude Oliva and Philippe Schyns at the University of Glasgow devised them to help probe how and when the brain recognises objects at different resolutions, such as coarse features versus fine details. When you drive down the street or look out of the window, your eyes are bombarded by objects of different sizes, shapes and colours. By manipulating what you see,