To achieve this, they first printed a rainbow colour palette from a standard, three-colour office printer onto white paper and imaged the spectral reflectance under multiple wavelengths of visible and near-infrared light. This would allow images visually indistinguishable from the originals while obviating the use of visible light. In this latest research, Baldi and ophthalmologist Andrew Browne, also at UCI, set out to produce full-colour images from multi-wavelength infrared illumination. Researchers had previously tried several approaches to colourizing infrared images, but these often required some knowledge of the visible image as an input or sacrificed image clarity for colour. At the same time, you would like the surgeon to see things as though they were irradiated with regular light.” Multi-wavelength infrared illumination “Surgery may last four hours – if you have high intensity, short wavelength light shining on the retina continuously for four hours, there is a strong chance the patient may become blind. “It is very toxic for the retina to receive light of high intensity for long periods of time,” he explains. Both, however, usually produce monochromatic images, so researchers are seeking ways to produce multi-colour images of objects without having to bathe them in visible light.Ĭomputer scientist Pierre Baldi of University of California, Irvine (UCI), explains that this would be very useful in medical applications where use of visible light is problematic. Traditional night vision systems work by illuminating an area with near infrared radiation and detecting the reflections or by using ultrasensitive cameras to detect the small amount of light present even at night.
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