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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Digital fringe projection (DFP) techniques provide dense 3D measurements of dynamically changing surfaces.&#160;Like the human eyes and brain, DFP uses ...

Iowa State University

Successful recovery from a lateral ankle sprain often requires the use of several different ankle braces during different stages of rehabilitation. During the initial time period after the injury, a highly restrictive ankle-foot orthosis or walking boot may be implemented to severely limit lateral ankle movement. As the ankle heals, progressively "softer" braces are used to gradually return function to the patient. Using multiple braces is costly, and current braces require periodic manual adjustments by the user in order to maintain support, as they tend to loosen and shift out of place over time. The present design of a self-adjusting ankle brace aims to provide consistent support to the user's ankle during exercise. A pressure-sustaining system gives the user control over the stiffness level of the brace, allowing the user to obtain different levels of ankle support from the same single product. In summary, the self-adjusting ankle brace ensures that a constant level of ankle support is provided during activity, and allows the user to specify that level of support based on the severity of injury and current stage of recovery. This versatility should facilitate a steady progression towards regaining full ankle functionality after suffering a lateral ankle sprain.

Designing a self-adjusting ankle brace - biomed 2009.

Our previous research has shown that 3D range data sizes can be substantially reduced if they are converted into regular 2D images using the Holoimage technique. Yet, this technique requires all 24 bits of a standard image to represent one 3D point, making it impossible for a regular 2D image to carry 2D texture information as well. This paper proposes an approach to represent 3D range data with 3 bits, further reducing the data size. We demonstrate that more than an 8.2:1 compression ratio can be achieved with compression root-mean-square error of only 0.34%. Moreover, we can use another bit to represent a black-and-white 2D texture, and thus both 3D data and 2D texture images can be stored into an 8 bit grayscale image. Both simulation and experiments are presented to verify the performance of the proposed technique.

Nikolaus Karpinsky

3D Machine Vision Laboratory,
Department of Mechanical Engineering,
3D Machine Vision Laboratory, Department of Mechanical Engineering

Iowa State University

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Nikolaus Karpinsky

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Iowa State University

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

3D Machine Vision Laboratory,
Department of Mechanical Engineering,
3D Machine Vision Laboratory, Department of Mechanical Engineering