The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present the focal flow sensor. It is an unactuated, monocular camera that simultaneously exploits defocus and differential motion to measure a depth map and a 3D scene velocity field. It does this using an optical-flow-like, per-pixel linear constraint that relates image derivatives to depth and velocity. We derive this constraint, prove its invariance to scene texture, and prove that it is exactly...
In this paper we report a wide-angle two-axis electrothermal MEMS scanning mirror and its application in optical coherence tomography (OCT). The wide-angle scanning was achieved by combining the large scan range of the MEMS mirror and the “Snell's Window” effect. By immersing the electrothermal MEMS mirror into a mineral oil, the original 32° field of view (FOV) can be increased up to about 75°. The...
This paper reports an electrothermal MEMS scanning mirror working in liquid for the first time. By submerging the MEMS mirror into a mineral oil whose refractive index is 1.47, a wide-angle optical scan (>120°) was achieved at small driving voltage (<10V), and the scan frequency reached up to 30 Hz. The wide angle was achieved because of the angular increase of the “Snell's Window” effect and...
Presented here is a fusion system based on simple, low-cost computer vision and radiological sensors for tracking of multiple objects and identifying potential radiological materials being transported or shipped. The main focus of this work is the development of calibration algorithms for characterizing the fused sensor system as a single entity. There is an apparent need for correcting for a scene...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.