Ghost Imaging – Capture Moving Objects With Light
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An unconventional imaging method is known as ghost imaging. One of its advantages is that it allows one to form an image by illuminating the object with lower light levels than traditional imaging approaches. However, ghost imaging has been limited to stationary objects because it takes a long time to project the sequence of light patterns onto the object that is necessary to reconstruct an image. This causes images of a moving object to appear blurry.
A new technology can capture moving objects with ghost imaging. The new method could make the imaging technique practical for new applications such as biomedical imaging, security checks and video compression and storage, according to phys.org.
The researchers from the National University of Defense Technology in China combined information in the blurry images with details about the object’s location to create high quality images of moving objects with ghost imaging. Research team leader Wei-Tao Liu said: “With further improvements, this approach could make ghost imaging useful for applications such as biomedical imaging of human beings. If used with x-rays, for example, it could help reduce the radiation dose needed for imaging.”
To apply ghost imaging to moving objects, the new method uses a small number of light patterns to capture the position and trajectory of the object. The researchers developed an algorithm to cross correlate this positional information with blurred images captured at different positions, allowing a clear image to be gradually formed.
The development was demonstrated using a typical ghost imaging system, in which a random light field was divided into two beams. One beam was recorded by a CCD camera, while the other illuminated a moving object the researchers created using a digital micromirror device. The light coming from the moving object was collected by a single-pixel detector.
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