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Rights: The University of Waikato
Published 21 July 2007

Dr Eli Van Houten from the University of Canterbury describes how the DIET project relies on taking multiple still images of a moving object to get information about the surface and surface motion.

The DIET process involves taking many still images of the surface of a phantom or real breast. They need lots of images because the breasts are moving and they need to not only capture the surface, but the moving surface. This means they need a sequence of images so they can see the change in the surface over time.


The actual DIET process involves taking many many still images of the object that we’re trying to get the elasticity image for. The reason that we need so many images is because we are trying to accomplish two things, one we need to be able to describe in three dimensions the geometry of the surface of the object that we are imaging. So we need multiple images from multiple cameras to capture that whole surface, and we actually go through a specific process to calibrate the camera so that when you see one object and two views from two separate cameras you can figure out its position in three dimensions. Now the second reason for all the images is that the object is actually moving, so not only do we need to capture its surface, but we also need to capture its moving surface, which means we need a time sequence of images so that we can see the change in the surface in time and that’s the motion.