Scientists at the University of Glasgow have developed a technique for making low-cost 3D images without using Digital cameras.instead of this they uses Single pixel detector.its entirely different from normal digital cameras which has millions of pixels to absorb light at frequencies beyond that of the visible light spectrum.This advance findings will became a useful tool for a wide range of industries including the fields of medicine and geography.
Professor Miles Padgett leads the team of researchers from the University of Glasgow’s School of Physics and Astronomy. Professor Padgett said: “Single-pixel detectors in four different locations are used to detect light from a data projector, which illuminates objects with a rapidly-shifting sequence of black-and-white patterns similar to crossword puzzles. When more of the white squares of these patterns overlap with the object the intensity of the light reflected back to the detectors is higher. A series of projected patterns and the reflected intensities, are used in a computer algorithm to produce a 2D image.
“Four detectors give images, each of which contain shadows, giving us clues about the 3D shape of the object. Combining the four images using a well-known technique known as ‘shape from shade’ allows us to create a full 3D image of the object.
“Conventional 3D imaging systems which use multiple digital camera sensors to produce a 3D image from 2D
information need to be carefully calibrated to ensure the multi-megapixel images align correctly. Our single-pixel
system creates images with a similar degree of accuracy without the need for such detailed calibration.”
The technique the team use is called 3D computational imaging, or ‘ghost‘ imaging, and the system they have
created can produce detailed images of objects in just a few seconds
Lead author on the paper Baoqing Sun, of the University’s School of Physics and Astronomy, said
“However, digital camera sensors have a very limited sensitivity beyond the spectrum of visible light, whereas a single-pixel detector can easily be made to capture information far beyond the visible, reaching wavelengths from X-ray to TeraHertz.”
single-pixel detectors which cost just a few pounds each are now capable of producing images across a far wider spectrum than 3D imaging systems currently on the market which cost tens of thousands of pounds.
Research assistant Matthew Edgar, who contributed to the paper, said:
“We plan to continue working on the system and perhaps working with commercial partners to bring a version to market in the future.”