Abstract:
A method and apparatus for estimating reflectance parameters and a position of the light source(s) of specular reflections of a scene include RGB sequence analysis with measured geometry in order to estimate specular reflectance parameters of an observed 3D scene. Embodiments include pixel-based image registration from which profiles of 3D scene points image intensities over the sequence are estimated. Profiles are attached to a 3D point and to the set of pixels that display its intensity in the registered sequence. Subsequently, distinction is made between variable profiles that reveal specular effects and constant profiles that show diffuse reflections only. Then, for each variable profile diffuse reflectance is estimated and subtracted from the intensity profile to deduce the specular profile and the specular parameters are estimated for each observed 3D point. Then, the location of at least one light source responsible for the specular effects is estimated. Optionally, the parameters can be iteratively refined to determine color information and specular reflectance parameters.
Abstract:
The present invention aims to provide a light receiving device which can calculate difference values of outputs from light receiving parts at the same time with a high S/N ratio while suppressing the number of output terminals without using switching elements. The light receiving device of the present invention includes a circuit pattern including first and second light receiving parts and first and second output terminals, which are formed on the same substrate, each of the first and second light receiving parts having a semiconductor layered part forming a photodiode structure having a first conductivity type semiconductor layer and a second conductivity type semiconductor layer, and a first electrode and a second electrode respectively connected to the first conductivity type semiconductor layer and the second conductivity type semiconductor layer, wherein the first electrodes of the first and second light receiving parts are connected to each other, the second electrode of the first light receiving part is connected to the first output terminal, the second electrode of the second light receiving part is connected to the second output terminal, and a difference between signals generated in the first light receiving part and the second light receiving part is output between the first and second output terminals.
Abstract:
An object detection device includes an acquisition unit configured to acquire information indicating a temperature distribution, a storage unit configured to store background information indicating a temperature distribution when no target object exists, a detection unit configured to detect existence or absence of a target object, and an update unit configured to repeatedly update the background information. The update unit performs, with respect to a non-detection region, a first background updating process for the update of the background information based on the acquired information and performs, with respect to a detection region, a second background updating process for the update of the background information using a correction value.
Abstract:
Es wird ein Strahlungssensor (1) zum Erfassen der Position und Intensität einer Strahlungsquelle beschrieben. Der Strahlungssensor (1) weist wenigstens einen Fotodetektor (2) mit einer strahlungsempfindliche Oberfläche auf. Des weiteren weist der Strahlungssensor (1) einen Reflektor (3) auf, der die von einer Strahlungsquelle emittierte Strahlung aus bestimmten Richtungen zumindest teilweise in Richtung der strahlungsempfindlichen Oberfläche des Fotodetektors (2) reflektiert. Der Reflektor (3) ist auf der von der Strahlungsquelle abgewandten Seite des Strahlungssensors (1) angeordnet.
Abstract:
A method of detecting the direction of incidence of an incoming modulated continuous wave light signal in a field of view of a detector comprising introducing a phase shift into the modulated light signal received by at least one portion of the field of view relative to the modulated light signal received by at least one other portion of the field of view and utilising the phase shift in determining the direction of incidence.
Abstract:
One or more electromagnetic radiation sources, such as a light emitting diode, may emit electromagnetic waves into a volume of space. When an object enters the volume of space, the electromagnetic waves may reflect off the object and strike one or more position sensitive detectors after passing through an imaging optical system such as glass, plastic lens, or a pinhole located at known distances from the sources. Mixed signal electronics may process detected signals at the position sensitive detectors to calculate position information as well as total reflected light intensity, which may be used in medical and other applications. A transparent barrier may separate the sources and detectors from the objects entering the volume of space and reflecting emitted waves. Methods and devices are provided.
Abstract:
A signal detector system (10) comprises a single signal detector (11) having a limited on-time during which any received electromagnetic signal can be assessed. The signal detector (11) receives electromagnetic signals from a single direction in space (D) through a single optical fibre (12), a signal splitter (13) which splits the collected signal between three optical paths (20, 30 and 40), and a signal combiner (14) which combines the portions of the signal transmitted by the three optical paths (20, 30 and 40) and transmits the combined signal to a signal detector input (15). Each of the optical paths (20, 30 and 40) includes a respective optical delay (21, 31 and 41) designed to delay transmission of any received signal towards the signal detector (11). In this manner the signal detector (11) will receive any signals that arrived at the optical fibre (12) during three separate periods of time.