ABSTRACT
We previously formulated a new approach for computing invariant features from infrared (IR) images. That approach is unique in the field since it considers not just surface reflection and surface geometry in the specification of invariant features, but it also takes into account internal object composition and thermal state that affect images sensed in the nonvisible spectrum. In this paper, we extend the thermophysical algebraic invariance (TAI) formulation for the interpretation of uncalibrated infrared imagery and further reduce the information that is required to be known about the environment. Features are defined such that they are functions of only the thermophysical properties of the imaged objects. In addition, we show that the distribution of the TAI features can be accurately modeled by symmetric alpha-stable models. This approach is shown to yield robust classifier performance. Results on ground truth data and real infrared imagery are presented. The application of this scheme for site change detection is discussed.
ABSTRACT
In 12 anaesthetized dogs acute effects of serotonin on the atrioventricular conduction system were studied by obtaining intracardiac electrograms. The significant increase in the heart rate and decrease in aortic pressure elicited by an intravenous infusion of 50 mg/kg.min serotonin for 30 minutes were comparable to those observed in previous investigations. Our data indicate a serotonin induced acceleration of the sinus node pacemaker and atrioventricular conduction by direct and indirect mechanisms.
Subject(s)
Heart Conduction System/drug effects , Serotonin/pharmacology , Animals , Atrioventricular Node/drug effects , Atrioventricular Node/physiology , Dogs , Electrocardiography , Electrophysiology , Female , Heart Conduction System/physiology , Heart Rate , Infusions, Intravenous , Male , Serotonin/administration & dosage , Sinoatrial Node/drug effects , Sinoatrial Node/physiology , Time FactorsABSTRACT
A simple method for radiographic visualization of the lacrimal drainage apparatus is presented. Equipment necessary is explained and normal radiographic anatomy of the system illustrated. Several cases of high- and mid-level obstructions are shown via this technique and a discussion follows.
