Abstract: Various techniques are disclosed to provide for improved human body temperature detection using thermal images of an inner canthus. In one example, a method includes capturing a thermal image of a human being using a thermal imager. The method also includes determining an uncompensated temperature measurement associated with an inner canthus of a face of the human being using corresponding pixels of the thermal image. The method also includes determining a correction term as a function of a distance between the thermal imager and the human being. The method also includes applying the correction term to the uncompensated temperature measurement to provide a corrected temperature measurement associated with the inner canthus to compensate for attenuation associated with the distance. Additional methods and systems are also provided.

Abstract: Techniques are provided for facilitating detection threshold determination for infrared imaging systems and methods. In one example, a method includes capturing, by an imaging device, a thermal image of a scene. The method further includes determining temperature difference data indicative of a difference between temperature data of the thermal image associated with a background of the scene and temperature data of the thermal image associated with gas detection. The method further includes determining detection threshold data based on sensitivity characteristics associated with the imaging device and the temperature difference data. The method further includes generating a detection threshold image based on the detection threshold data. Each pixel of the detection threshold image corresponds to a respective pixel of the thermal image and has a value indicative of a detection threshold associated with the respective pixel of the thermal image. Related devices and systems are also provided.

Abstract: Systems and methods include an infrared camera configured to capture an infrared image of a scene, a display configured to display a portion of the captured infrared image and at least one graphic indicia to guide a person being scanned, and a logic device configured to scan a region of interest using an infrared camera, detect a person in the region of interest, instruct the person to move into a scanning position, initiate temperature scanning of person if scanning criteria is satisfied, determine temperature of the person and compare to at least one temperature threshold, and perform a task associated with determined temperature. The system may further comprise a dual-image camera comprising the infrared camera and a visible image camera, wherein the dual-image camera comprises a beamsplitter arranged to reflect visible light towards the visible image camera and pass through an infrared image to the infrared camera.

Abstract: The present disclosure relates to combination of images. A method according to an embodiment comprises: receiving a visual image and an infrared (IR) image of a scene and for a portion of said IR image extracting high spatial frequency content from a corresponding portion of said visual image. The method according to the embodiment further comprises combining said extracted high spatial frequency content from said portion of the visual image with said portion of the IR image, to generate a combined image, wherein the contrast and/or resolution in the portion of the IR image is increased compared to the contrast and/or resolution of said received IR image.

Abstract: Techniques for facilitating stray light mitigation are provided. In one example, a method includes determining moving averages associated with an image. Each of the moving averages is associated with a respective window size. The method further includes determining a kernel based on the moving averages. The method further includes generating a stray light compensated image based on the image and the kernel. Related devices and systems are also provided.

Abstract: System and methods for capturing infrared images for include infrared imaging components configured to capture infrared images of a scene, user input and output components include a display and at least one user input component, and a logic device configured to guide the user through an infrared image acquisition process to acquire an infrared image of an inspection area, and guide the user through an analysis of the captured infrared image to detect a condition visible in the infrared image of the inspection area. The user is guided through environmental and/or location considerations associated with the condition, instructed to prepare the location for infrared image acquisition, and guided through a process for analyzing captured images.

Abstract: Techniques are provided for variable sensitivity in infrared imaging. In one example, an infrared imaging system includes an infrared imager and a logic device. The infrared imager is configured to capture a first infrared image of a scene using a sensitivity setting. The logic device is configured to determine a temperature associated with the scene based on a second infrared image of the scene. The logic device is further configured to determine the sensitivity setting based on an ambient temperature associated with the infrared imager and the temperature associated with the scene. Related devices and methods are also provided.

Abstract: Systems and methods include an infrared camera configured to capture an infrared image of a scene, a visible-light camera configured to capture a visible-light image of the scene, and a logic device configured to simultaneously capture a pair of images of the scene comprising the infrared image of the scene and the visible image of the scene, align the pair of images so that a pixel location in one of the pair of images has a corresponding pixel location in the other image, classify the visible image, annotate the infrared image based, at least in part, on the classification of the visible image, and add the annotated infrared image to a neural network training dataset for use in training a neural network for infrared image classification. A beamsplitter is arranged to reflect a first image of the scene towards the infrared camera and pass through a second image of the scene to the visible-light camera, and a first blackbody is attached thereto and positioned in a field of view of the infrared camera.

Abstract: Various techniques are provided performing temperature inspections of assets, such as temperature-sensitive industrial equipment. In one example, a method includes receiving, at a portable device, inspection instructions associated with an asset at a location in an environment. The method also includes displaying, at the portable device, the asset in an augmented reality format to guide a user of the portable device to the location. The method also includes capturing, by a thermal imager associated with the portable device, a thermal image of the asset when the thermal imager is aligned with the asset. The method also includes extracting, from the thermal image, at least one temperature measurement associated with the asset. Additional methods and systems are also provided.

Abstract: Provided are systems and methods to filter infrared spectrum radiation that can be integrated with a compact optical system for an infrared imaging system. The optical system includes an objective lens element configured to receive and transmit infrared (IR) radiation from a scene, where the IR radiation from the scene includes a particular range of wavelengths corresponding to an absorption spectrum or a transmission spectrum of a gas. The optical system also includes a spectral lens element configured to receive the IR radiation transmitted through the objective lens element, where the spectral lens element comprises a first interference filter disposed on a first surface of the spectral lens element. The interference filter is configured to filter the IR radiation transmitted through the objective lens element to a narrower wavelength band that includes the particular range of wavelengths.

Abstract: Various techniques are provided for improved detection of scene changes using a thermal imager. In one example, a method includes capturing a plurality of thermal images of a scene using a thermal imager. The method also includes detecting motion associated with the thermal imager during the capturing. The method also includes determining a temporal delay in response to the detected motion. The method also includes selecting first and second ones of the thermal images captured at corresponding first and second times separated by the temporal delay. The method also includes processing the first and second thermal images to generate a comparison thermal image identifying changes in the scene between the first and second times. Additional methods and systems are also provided.

Abstract: Various techniques are provided for increasing contrast between gas features and other features in a scene. In one example, a method includes receiving a captured image frame comprising a plurality of pixels having a first range of associated pixel values. The method also includes receiving a selection of a subset of the pixels, wherein the subset comprises a gas feature and a scene feature. The method also includes determining a span associated with the pixels of the subset having a second range of associated pixel values smaller than the first range. The method also includes scaling the captured image frame to provide an adjusted image frame limited to the second range of pixel values associated with the span to increase contrast between the gas feature and the scene feature. The method also includes displaying the adjusted image frame. Additional methods and systems are also provided.

Abstract: Various techniques are provided to reduce noise in captured images using frame-to-frame shifts of scene information. In one example, a system includes an imager and a processor. The imager is configured to capture a plurality of image frames comprising scene information. The image frames exhibit frame-to-frame shifts of the scene information caused by a motion pattern associated with the imager. The processor is configured to distinguish noise in the image frames from the frame-to-frame shifts of the scene information. The processor is also configured to update non-uniformity correction terms to reduce the noise. Additional systems and methods are also provided.

Abstract: Various techniques are provided for increasing contrast of gas features in a scene. In one example, a method includes receiving a captured infrared image comprising a gas feature and a scene feature. The captured infrared image comprises a first range of pixel values associated with a first temperature range of the gas feature and the scene feature. The method also includes applying a spatial filter to the captured infrared image to provide a spatially filtered infrared image retaining the gas feature and removing the scene feature. The spatially filtered infrared image comprises a second range of pixel values associated with a second temperature range of the gas feature without the additional scene feature to exhibit increased gas contrast over the captured infrared image. Additional methods and systems are also provided.