Mitsubishi Electric

About: Mitsubishi Electric is a company organization based out in Ratingen, Germany. It is known for research contribution in the topics: Signal & Voltage. The organization has 23024 authors who have published 27591 publications receiving 255671 citations. The organization is also known as: Mitsubishi Electric Corporation & Mitsubishi Denki K.K..

Smith-Purcell experiment utilizing a field-emitter array cathode: measurements of radiation

Abstract: Smith–Purcell (SP) radiation at wavelengths of 350–750 nm was produced in a tabletop experiment using a field-emitter array (FEA) cathode. The electron gun was 5 cm long, and a 25 mm×25 mm holographic replica grating was placed behind the slit provided in the anode. A regulated DC power supply accelerated electron beams in excess of 10 μA up to 45 keV, while a small Van de Graaff generator accelerated smaller currents to higher energies. The grating had a 0.556 μm period, 30° blaze and a 0.2 μm thick aluminum coating. Spectral characteristics of the radiation were measured both manually and automatically; in the latter case, the spectrometer was driven by a stepping motor to scan the wavelength, and AD-converted signals from a photomultiplier tube were processed by a personal computer. The measurement, made at 80° relative to the electron beam, showed good agreement with theoretical wavelengths of the SP radiation. Diffraction orders were −2 and −3 for beam energies higher than 45 keV, −3 to −5 at 15–25 keV, and −2 to −4 in between. The experiment has thus provided evidence for the practical applicability of FEAs to compact radiation sources.

Bayesian Modeling of Facial Similarity

Abstract: In previous work [6, 9, 10], we advanced a new technique for direct visual matching of images for the purposes of face recognition and image retrieval, using a probabilistic measure of similarity based primarily on a Bayesian (MAP) analysis of image differences, leading to a "dual" basis similar to eigenfaces [13]. The performance advantage of this probabilistic matching technique over standard Euclidean nearest-neighbor eigenface matching was recently demonstrated using results from DARPA's 1996 "FERET" face recognition competition, in which this probabilistic matching algorithm was found to be the top performer. We have further developed a simple method of replacing the costly compution of nonlinear (online) Bayesian similarity measures by the relatively inexpensive computation of linear (offline) subspace projections and simple (online) Euclidean norms, thus resulting in a significant computational speed-up for implementation with very large image databases as typically encountered in real-world applications.

Communication quality judgment method, mobile station, base station, and communications system

Abstract: In order to carry out high-speed packet communications using a large-volume transmission channel like an E-DCH, uplink communication quality must be good. However, in a state in which a link imbalance occurs, a mobile station cannot estimate the uplink communication quality from downlink communication quality. Therefore, the mobile station calculates a path loss from the setting power of a common pilot channel which is notified from a base station, and the received power of the common pilot channel received thereby, and also estimates the received power in the base station on the basis of this path loss. The mobile station further judges the uplink communication quality by estimating the SIR in the base station by using the interference power notified from the base station and the estimated received power.

Infrared focal plane array

Abstract: A two-dimensional infrared focal plane array comprising temperature detecting units in which one temperature detecting unit is arranged for each pixel in a two-dimensional arrangement on a semiconductor substrate, said temperature detecting unit being formed integrally with a thermal type light detector and a means for detecting a change in characteristic of said thermal type light detector, said change being caused by an incident infrared ray, wherein a temperature detecting portion which is supported by support legs comprising a high thermal resistance material capable of controlling a heat flow to said semiconductor substrate and which has a temperature detecting element, and an infrared ray absorbing portion are provided for each pixel on said semiconductor substrate, characterized in that said infrared ray absorbing portion is spliced by at least one splicing pillar with said temperature detecting portion, and said infrared ray absorbing portion comprises silicon dioxide or silicon nitride, or a laminate film of silicon dioxide and silicon nitride, and wherein the thermal resistance of the splicing pillar is smaller than the thermal resistance of the support legs.

A Unified Framework for Video Summarization, Browsing, and Retrieval

Abstract: This chapter reviews and discusses recent research progress in multimodal analysis, representation, summarization, browsing, and retrieval. It introduces the video table of contents (ToC), the highlights, and the index, and presents techniques for constructing them. It further proposes a unified framework for video summarization, browsing, and retrieval to enable a user to go back and forth between browsing and retrieval. An essential part of the unified framework is composed of the weighted links. The links can be established between index entities and scenes, groups, shots, and key frames in the ToC structure for scripted content and between index entities and finer-resolution highlights, highlight candidates, audio-visual markers, and plays/breaks. For scripted content, focus is given on the links between index entities and shots. Shots are the building blocks of the ToC. An example of going from the visual index to the highlights is shown for unscripted content. This chapter recapitulates the key components of video highlights extraction and video retrieval. Video retrieval is concerned with how to return similar video clips to a user given a video query.