Abstract: An apparatus and a method in an electronic device provide for controlling a camera and an infrared illuminator, wherein an image capturing process is initiated to produce image data representing a photographic scene. In response to initiating the image capturing process, an infrared illuminator is activated to illuminate the photographic scene. Reflected infrared light from the photographic scene is measured to produce exposure data. In response to the exposure data, a sensor is exposed and image data from the sensor in the electronic device is stored. The electronic device can be a wireless device. Exposure data can include an aperture size, an exposure duration, a lens position for focusing, and the like. Sensing a reflection of infrared light can indicate the presence of a subject in the photographic scene that can be illuminated. The infrared illuminator can be activated before or during the capturing of image data.

Abstract: A method of assessing the condition of a component through a thermal window, the method including storing information on a radio-frequency identification (RFID) tag associated with the component or the thermal window and taking a thermal image of the component through the thermal window using a thermal imaging device. The method also including retrieving the information on the RFID tag using a radio-frequency identification (RFID) reader on the thermal imaging device. Also, a thermal imaging system comprising a thermal imaging device including a radio-frequency identification (RFID) reader, and a thermal window having a radio-frequency identification (RFID) tag associated with the thermal window. The RFID reader may be adapted to access information on the RFID tag.

Abstract: A multispectral thermal infrared camera system is disclosed. An uncooled thermal imaging camera is equipped with an axially tilted, cooled spectral filter. The axially tilted, cooled spectral filter deflects the radiation emitted by the uncooled camera away from being reflected back into the camera. The axially tilted, cooled spectral filter emits a lesser amount of thermal radiation towards the camera. And the axially tilted, cooled tilted filter is enclosed in a cold radiation shield to minimize the thermal emission that would be reflected by the filter towards the camera and to absorb the radiation deflected by the tilted filter. The axially tilted, cooled spectral filter passes only the desired portion of the thermal infrared radiation from the scene onto the uncooled camera.

Abstract: Various techniques are provided to perform flat field correction for infrared cameras. In one example, a method of calibrating an infrared camera includes calibrating a focal plane array (FPA) of the infrared camera to an external scene to determine a set of flat field correction values associated with a first optical path from the external scene to the FPA. The method also includes estimating a temperature difference between the FPA and a component of the infrared camera that is in proximity to the first optical path. The method also includes determining supplemental flat field correction values based on, at least in part, the first set of flat field correction values, where the supplemental flat field correction values are adjusted based on the estimated temperature difference before being applied to thermal image data obtained with the infrared camera. The method also includes storing the supplemental flat field correction values.

Abstract: An infrared cut filter may be used with an image sensor to remove infrared light components from image light received from a first side of the infrared cut filter prior to the image light reaching the image sensor to be disposed on a second side of the infrared cut filter. The infrared cut filter includes at least one red absorbing layer and an infrared reflector. The at least one red absorbing layer partially absorbs red light components within the image light. The infrared reflector reflects the infrared light components. The infrared reflector is disposed between the red absorbing layer and the first side of the infrared cut filter while the at least one red absorbing layer is disposed between the infrared reflector and the second side of the infrared cut filter.

Abstract: An object of the present invention is to provide an infrared camera capable of shading correction with ease and an improved degree of accuracy and has good maintenance ability. To achieve the object, an infrared camera provided with an infrared lens group and an infrared image sensor located at an image focusing surface of the infrared lens group in a housing in which a window is formed at a portion facing the object side of the infrared lens group comprising: a controller correcting a captured image according to an output from the infrared image sensor and outputting the corrected image; a shutter arranged on an infrared light path in the housing from the window to the infrared lens group; and a temperature sensor detecting the temperature of the shutter is adopted.

Abstract: In a thermal imaging camera for acquisition of thermographic images of a measurement object, an electronic evaluation unit is integrated into the thermal imaging camera; it is designed for recognition of corresponding partial regions of the acquired thermographic images, and with it, the acquired images can be assembled into an overall image by overlapping the corresponding partial regions and displayed. The acquisition of the images preferably takes place during the swiveling of the thermal imaging camera over the solid angle region of the desired overall image.

Abstract: The invention relates to an imaging device which includes a matrix IR detector, a multifocal lens with a focal length ranging from a short focal length to a long focal length, including a front group of lenses, a variator, a compensator and means for positioning the variator and the compensator, the positions of the variator and of the compensator being respectively adapted to the focal length. This device includes a calibration system which comprises a control for the means for positioning the variator in the vicinity of its short focal length position and the compensator upstream of its long focal length position so as to conjugate the plane of the detector with a real object plane located upstream of the front group of lenses, this positioning being called calibration positioning.

Abstract: A photographing apparatus includes an optical system, an imaging device that converts image light passing through the optical system into an electrical signal, and a light amount reduction filter that is disposed on a light path of the image light incident on the imaging device and reduces an amount of light having a wavelength of 450 nm to 600 nm.

Abstract: A short light pulse generating device includes a light pulse generating part, a first pulse compressing part, a second pulse compressing part, and an amplifying part. The light pulse generating part is configured to generate light pulses, the light pulse generating part being a super luminescent diode. The first pulse compressing part is configured to perform pulse compression based on saturable absorption on the light pulses generated by the light pulse generating part. The second pulse compressing part is configured to perform pulse compression based on group velocity dispersion compensation on the light pulses that underwent the pulse compression by the first pulse compressing part. The amplifying part is provided between the first pulse compressing part and the second pulse compressing part, and configured to amplify the light pulses that underwent the pulse compression by the first pulse compressing part.

Abstract: Gas visualization in an image depicting a scene, for an example embodiment comprises capturing a first IR image depicting the scene at a first time instance and a second IR image depicting the scene at a second time instance; performing image processing operations on image data derived from said first IR image and from said second IR image, to generate a collection of data representing the location of gas in one of the first or second IR images; and generating a third image by adjusting pixel values in an image depicting the scene, dependent on pixel values of said collection of data. According to various embodiments, there is further provided further processing of the collection of data, and/or gas detection, before generation of the third image with adjusted pixel values.

Abstract: A microcontroller receives color codes of pixel points in an image captured by an infrared camera. If there is a color code falling within a color code range corresponding to a warning temperature range, the microcontroller determines a location of the pixel point of the image corresponding to the color code. A block of a monitored area of the image corresponding to the location is determined. An alarm is activated and an LED (light-emitting diode) is controlled to point at the determined block to let monitoring people know which person object has an inappropriately high temperature.

Abstract: The present invention relates to a camera module and an optical touch screen using the same, the camera module including an infrared emitting diode for emitting infrared ray, a first infrared pass filter passing only the infrared ray reflected by a retro reflector, an object lens condensing the infrared ray that has passed the first infrared pass filter, a second infrared pass filter passing an infrared ray of a particular wave band among the infrared ray condensed by the object lens, and a linear sensor for detecting an area touched by incidence of infrared ray that has passed the second infrared pass filter.

Abstract: The imaging apparatus includes: a multiband image sensor with a light receiving surface which includes two-dimensional arrays of at least three visible light pixels and an infrared pixels, the visible light pixels having sensitivity in different visible light wavelength ranges, the infrared pixels having sensitivity in the infrared wavelength range; a coded aperture which is disposed on the light receiving surface side of the multiband image sensor and serves as an aperture in a predetermined shape with respect to light in the wavelength range in which the infrared pixel has sensitivity while directly transmitting light in other wavelengths; and a processor for processing an image obtained by the multiband image sensor. The processor generates a depth map based on an image obtained by the multiband image sensor to thereby perform processing of a blurred image.

Abstract: A video based method to detect volatile organic compounds (VOC) leaking out of components used in chemical processes in petrochemical refineries. Leaking VOC plume from a damaged component causes edges present in image frames to loose their sharpness, leading to a decrease in the high frequency content of the image. Analysis of image sequence frequency data from visible and infrared cameras enable detection of VOC plumes in real-time. Analysis techniques using adaptive background subtraction, sub-band analysis, threshold adaptation, and Markov modeling are described.

Abstract: A system and method are provided for processing digital signals of an infrared image. In a frame's backward-stroke, performing a differential weight accumulation process on an original column diagram data representing an original column diagram curve distribution of a current frame image, so as to filter overbright or overdark pixels, and output grayscale value data of a last frame image after being processed in a last frame's backward-stroke. In a frame's forward stroke, receiving the grayscale value data of the last frame image and performing a grayscale shift process in way of multi-meandering lines on the received grayscale value data, so as to perform different levels of brightness grayscale shift for the grayscale value data on bright or dark side, and output the processed grayscale value data of the last frame image. The present application can provide better scene adaptability for the infrared image.

Abstract: A viewing apparatus (106) for a rifle scope (104), the viewing apparatus comprising a camera unit (108) having a camera and attachment means operable to attach the camera unit to a rifle scope such that the camera is exposed to an image visible at an eyepiece of a rifle scope, the camera being adapted to generate image data from the image to which it is exposed, the camera unit being arranged and operable to transfer the image data from the camera to a display unit (110), the display unit comprising display means being arranged and operable to display the image data received from the camera unit, the display unit further comprising attachment means (140) operable to attach the display unit to a rifle scope.

Abstract: An infrared solid state imaging device includes an infrared detection element unit having heat sensitive pixels, an AD conversion unit which conducts analog-to-digital conversion on an infrared image signal obtained by the infrared detection element unit, and a digital signal processing unit which converts the image signal converted to a digital signal. The digital signal processing unit stores an image value produced from the digital signal, and acquired in a frame immediately preceding a current frame, subtracts an image value obtained by multiplying the image value acquired in the frame immediately preceding the current frame by a predetermined constant ? in a range of 0 to 1, from an image value acquired in the current frame, and conducts processing of multiplying a resultant image value obtained by the subtraction by 1/(1??) so that an infrared image with less afterimage is provided.

Abstract: Apparatus and methods for using infra-red light provide for enhanced operation in camera applications. In an embodiment, a safety camera includes an optical filter that provides an input to an imager from received light having wavelengths in the infra-red spectrum. Output from the imager can be analyzed to determine safety hazard events in an area viewed by the safety camera.

Abstract: An infrared locator provides a camera image of a scene while collecting thermal information via a thermal sensor. A direction indicator may be provided to indicate the direction of a heat source allowing the user to easily find the heat source. Alternatively or in addition a thermal indicator, such as a graph showing thermal levels, may be provided to allow the user to find a heat source. The infrared locator may display these indicators without obscuring any portion of the camera image. In addition, the infrared locator may have a memory device for recording images and thermal information.

Abstract: A method for displaying a thermal image in an infrared (IR) thermal camera, includes, for an embodiment, registering an outdoor temperature value, registering an indoor temperature value, calculating an isotherm level by using the registered temperature values and a temperature color alarm level, imaging a surface area to create an image of the temperature distribution in at least a part of the surface area, comparing the surface area temperature in at least one image point of the thermal image to the isotherm level, adjusting the color of the at least one image point in dependence of the relation between the surface area temperature in said at least one image point and the isotherm level and displaying the colored version of the thermal image. The method may allow a user to determine immediately, on-site, if a building is well insulated and may present an easily interpreted and understandable thermal image.

Abstract: An apparatus for detecting and viewing an invisible indicia includes an illumination source for illuminating the invisible indicia with radiation of a first wavelength; a sensor array for detecting emitted light from the invisible indicia at a second wavelength; a filter between the sensor and the invisible indicia for eliminating reflected radiation at the first wavelength; a lens for focusing an image of the invisible indicia on the sensor array; a video display for displaying the image of the invisible indicia; a spacer for spacing the sensor array at a fixed distance from the invisible indicia; and a gain control for adjusting sensitivity of the sensor array.

Abstract: An imaging apparatus is provided which includes an imaging unit including a first photoelectrical conversion device and a second photoelectrical conversion device, wherein the first photoelectrical conversion device generates first image data by photoelectrically converting a visible light component transmitted from a subject, and wherein the second photoelectrical conversion device generates second image data by photoelectrically converting an infrared light component transmitted from the subject, a filter removing the visible light component but allowing the infrared light component to pass through, a subject image position identification unit for identifying, in the first image data, a predetermined subject image and a position of the predetermined subject image, an infrared light intensity detection unit for detecting an infrared light intensity transmitted in the second image data, and a living body detection unit for detecting a living body based on the position of the predetermined subject image and th

Abstract: A motion detector consisting of multiple motion detector elements each having a preset field of view. An alarm signal generated by a motion detector element when movement is detected is sent to a detector controller which converts the alarm signal to a control signal for an associated camera to direct the field of view of the camera to match the preset field of view of the motion detector element that generated the alarm.

Abstract: A paper remote controller system capable of registering and controlling a plurality of apparatuses with an easy manipulation and superior in convenience and flexibility is provided. The input system for an apparatus using a dot pattern comprises a reading unit for reading out a dot pattern formed based on a predetermined rule on a medium surface, a converting unit for analyzing a dot pattern from image information of the dot pattern read out by the reading unit and converting the dot pattern into a dot code corresponding to the dot pattern, an infrared code table for registering one or a plurality of infrared codes that are related with the dot code, and a control unit for causing an infrared code read out from the infrared code table to be irradiated from an infrared emission unit to a control-subject apparatus.

Abstract: In some implementations, invisible light is emitted toward a subject being imaged in a low-light environment. A camera having a first color image sensor captures an image of the subject. Image processing is used to correct distortion in the image caused by the invisible light, and an augmented color image is output.

Abstract: Provided is an infrared optical system including: three lenses of a first lens, a second lens, and a third lens that are provided from an object side to an image-surface side, the first and third lenses being each configured as a spherical lens made of an inorganic material and having a positive refractive power, the second lens being configured as a meniscus lens made of a resin material and having aspherical surfaces; and an aperture stop that is provided between any two of the first to third lenses.

Abstract: A thermal imaging camera may be used to capture a visible-light (VL) image and an infrared (IR) image. In some examples, the camera includes adjustable focus IR optics. For example, the camera may include a focus mechanism coupled to the IR optics and configured to move the IR optics to various focus positions so as to focus the IR optics. The various focus positions may include a hyperfocal position in which a scene is in focus between a set distance and infinity, and a plurality of focus positions in which the scene is in focus between the set distance and a minimum focus distance. Depending on the configuration of the camera, the IR optics of the camera may define an F-number greater than 1.0, and an axis of the IR optics may be offset from an axis of the VL optics by a distance less than 1.7 inches.

Abstract: A single aperture polarimetric color imaging system includes a color filter array including a plurality of RGB filter elements in a path of received radiation that includes color band and near IR light. A linear polarizer array includes a plurality of polarization filter elements that provide a plurality of different polarization orientations that are optically aligned with the RGB filter elements. A single common pixel array includes a plurality of photodetector pixels for transducing the color band or near IR light into electrical signals after processing by the color filter array and linear polarizer array. A band select switching device switches between selectively transmitting the near IR band and color band or color band including light. A signal processor is coupled to receive and process the electrical signals from the common pixel array and generates polarimetric image data from the near IR band light and color image data from the color band or color band including light.

Abstract: A solid-state imaging apparatus 10 includes a solid-state imaging device 40, and a color filter 16 constituted of a first color filter 16a (first filter) and a second color filter 16b (second filter). The solid-state imaging device 40 photoelectrically converts light incident to a face S1 (first face) thereof to thereby capture an image of an object to be imaged. Arranged on the face S1 of the solid-state imaging device 40 is the first color filter 16a and second color filter 16b. The first color filter 16a is a filter that allows first wavelength band light to be selectively transmitted therethrough; the second color filter 16b is a filter that allows second wavelength band light in the longer wavelength side relative to the first wavelength band to be selectively transmitted therethrough.

Abstract: In order to generate a two-dimensional image of a sample in a short time using THz waves, provided is a reflective imaging device including a sample holder, a THz wave light source, a THz wave camera, a rotation mechanism for rotating the holder and the camera, and a processing unit. A sample unit includes an incidence member, a sample, and a reflection member. The sample includes a first region of only a membrane and a second region including a biopolymer. The camera detects, with regard to respective incident angles, a THz wave in which interference occurs between a component reflected at an interface between the incidence member and the sample and a component reflected at an interface between the sample and the reflection member, of each portion of the sample unit, and outputs a signal.

Abstract: Embodiments of the present invention disclose a system and method for editing electronic content using a handheld device. According to one example embodiment, the system includes a mobile computing device hosting electronic content, and a handheld imaging device. The handheld imaging device is configured to communicate with the mobile computing device and includes an optical sensor for capturing image data associated with an object or area. Still further, the handheld imaging device is configured to transmit and designate a location for insertion of said image data into the electronic content hosted on the mobile device.

Abstract: An integrated focal plane provides two co-aligned, overlapping pixel arrays in two formats, one with large pixels and low pixel count, the other with small pixels and high pixel count. Typically, the large pixels are 10 to 100 times larger in area than the small pixels. The dual arrays are disposed in a single detector substrate flip-chip bonded to a single readout circuit. They are sensitive to two infrared colors, one shorter and one longer wavelength band. The dual array focal plane concurrently provides two distinct pixel instantaneous fields of view within the same overall field of view as well as simultaneous fast and slow frame rates. The dual frame rates allow for combined fast sensing with sensitive imaging. Differing spatial and temporal data enables enhanced image processing for improved clutter rejection and detection performance. Differing gains combined with the dual frame rates provide an extended dynamic range.

Abstract: A thermal imaging system includes a mounting structure characterized by a first thermal conductivity and a focal plane array mounted to the mounting structure. The thermal imaging system also includes an optical system coupled to the mounting structure and a heating element coupled to the mounting structure. The thermal imaging system further includes a thermal isolator coupled to the mounting structure and characterized by a second thermal conductivity lower than the first thermal conductivity.

Abstract: Disclosed is a camera module. The camera module includes a lens assembly comprising a plurality of lens units having a polygonal outer peripheral portion, a lens barrel receiving the lens assembly, a fixing unit fixing the lens assembly to the lens barrel, a housing coupled with the lens barrel, and a sensor unit in the housing.

Abstract: A night vision system includes an image intensifier tube and circuitry coupled to a digital storage medium that periodically samples a signal provided by the image intensifier tube and stores the sampled image to be viewed in near real time or at a later date by a data analyst. The night vision system includes a casing surrounding the image intensifier tube and the associated circuitry along with a port for accepting a power and/or signal cable for providing power to the image intensifier tube and image signal data to the digital storage medium. The system may further include a daytime camera and a switch for toggling the image signal data input to the digital storage medium between the daytime camera and the image intensifier tube.

Abstract: The present invention relates to the fields of imaging systems, security screenings, contraband object detection, microwave screening, millimeter wave screening and Terahertz screening. The present invention especially relates to a camera assisted sensor imaging system and a multi aspect imaging system. The camera assisted sensor imaging system according to the present invention comprises an optical and/or infrared camera unit for generating camera image information, a processing and control unit for detecting targets based on the generated camera image information, and a sensor unit adapted to successively scan portions of a detected target and to generate a plurality of corresponding image information parts, whereby the sensor unit is operable in the microwave, millimeter wave and/or Terahertz frequency range, and the processing and control unit is further adapted to construct an image of the target based on the image information parts and based on the generated camera image information.

Abstract: An apparatus carried by an unmanned vehicle to provide passive sensing and facilitate avoiding airborne aerial obstacles is provided. The apparatus can include at least one, but typically multiple optical systems installed, for example, in the nose of the aerial vehicle to passively sense and determine a range, direction, and velocity of the airborne obstacles to allow the aerial vehicle to avoid the airborne obstacles. The typical optical system includes at least one focal plane array or other imaging device configured to receive a wide field of view and at least one focal plane array or other imaging device configured to receive a steerable narrow field of view within the wide field of view to allow concentrated determination of the range, direction, and/or velocity of obstacles detected by the wide field of view imaging devices.

Abstract: A fluid cooled thermal management technique for a high-density composite focal plane array (CPFA) is disclosed. In one embodiment, a high density CFPA assembly includes a plurality of imaging dies mounted on a front surface of a printed wiring board (PWB) and a base plate. The base plate has a substantially matched coefficient of thermal expansion (CTE) to that of the high density CFPA. Further, the high density CFPA is disposed on a front side of the base plate. Furthermore, the base plate has a plurality of integral serpentine fluid flow channels configured to receive and circulate fluid and further configured such that the heat generated by the CFPA is transferred via conduction into the base plate and to the integral serpentine fluid flow channels and to the circulating fluid to dissipate the generated heat.

Abstract: A vacuum compatible high-density electrical interconnect system for use in a vacuum environment is disclosed. In one embodiment, the vacuum compatible high-density electrical interconnect system includes a vacuum compatible base plate, a vacuum compatible printed wiring board (PWB) disposed on the vacuum compatible base plate and a vacuum compatible interposer module disposed in the vacuum compatible base plate. Further, the vacuum compatible PWB includes a plurality of components on a front side of the vacuum compatible PWB and a plurality of associated pads on a back side of the vacuum compatible PWB. In one exemplary embodiment, the vacuum compatible interposer module is disposed in the vacuum compatible base plate such that it operatively connects to the plurality of associated pads on the back side of the vacuum compatible PWB and further operatively connects to a plurality of pads of an external device that is disposed outside the vacuum environment.

Abstract: An imaging device includes: plural photoelectric conversion device layers in which photoelectric conversion devices performing photoelectric conversion of incident light are formed; and a wiring layer sandwiched by respective photoelectric conversion device layers, in which wirings for reading charges from the photoelectric conversion devices are formed.

Abstract: A system includes a time of flight (TOF) camera or similar device, a processor coupled to the TOF camera, and a sensor. The processor receives TOF data from the sensor. The TOF data is related to an object within range of the TOF device. The processor calculates dimensions of the object using the time of flight data.

Abstract: An IR camera includes a thermal radiation capturing arrangement for capturing thermal radiation of an imaged view in response to input control unit(s) receiving user inputs from a user of the IR camera; a processing unit arranged to process the thermal radiation data in order for the thermal radiation data to be displayed by an IR camera display as thermal images; and an IR camera display arranged to display thermal images to a user of the IR camera. The processing unit is further arranged to determine at least one temperature reference value representing the temperature of the surrounding environment of the imaged view; and calculate at least one output power value indicative of an amount of energy dissipated in a part of the imaged view by using the temperature value of the thermal radiation data corresponding to said part of the imaged view and the at least one determined temperature reference value.

Abstract: Systems and methods disclosed herein provide for some embodiments infrared camera systems for maritime applications. For example in one embodiment, a watercraft includes a plurality of image capture components coupled to the watercraft to capture infrared images around at least a substantial portion of a perimeter of the watercraft; a memory component adapted to store the captured infrared images; a processing component adapted to process the captured infrared images according to a man overboard mode of operation to provide processed infrared images and determine if a person falls from the watercraft; and a display component adapted to display the processed infrared images.

Abstract: A dual field of view, all-refractive infrared optical system that images the mid-wave infrared light in one field of view and the short wave infrared light in the second field of view onto the same detector. The two fields of view vary in focal length by a factor of six. The narrow field of view images the SWIR radiation at a slow f/number of 10.0 while the wide field of view images the MWIR radiation at f/1.9. The field of view is changed via a single lens that changes its axial position within the lens, resulting in an axial zoom. The change in focal length and f/number at the same time enables an increased focal length without having to increase the aperture size by the ratio of the focal length change, but rather by the ratio of the focal length change divided by the ratio of the f/number change.

Abstract: The invention relates to an infrared camera comprising an optical zoom, characterized in that it comprises: —a matrix detector (5) comprising a cooled screen, a matrix able to detect infrared radiation; —a module (123) for modifying the focal length of the camera, the modifying module being able to vary the focal length of the camera so as to ensure the optical zoom function of the camera; and —an imager module (L4) able to ensure, for all the values of focal length of the camera: on the one hand the focusing of the infrared radiation on the matrix of the detector, and on the other hand the conjugation of the pupil of the camera on the cooled screen of the detector. The invention also relates to a method of observing a scene with the camera according to the invention.

Abstract: Object detection and selection for use in a device having digital camera functionality is described. The mechanism detects the occurrence of a gesture by a pointing member in an image frame captured by an IR image sensor. The gesture is then recognized and an object pointed to is detected. The object detected is then selected as a result of the gesture recognition.

Abstract: An image pickup device includes an image pickup element which captures an image of a projection surface, an optical filter which has higher transmissivity for infrared light than for visible light, a visible light transmitting member whose transmissivity for visible light is higher than the corresponding transmissivity of the optical filter, and a switching unit which switches between a first condition where the optical filter is disposed on an optical path of light entering the image pickup element, and a second condition where the visible light transmitting member is disposed on the optical path.

Abstract: An image sensor including a noise removing unit may sense images accurately by measuring the amount of noise generated when the image sensor does not perform a sensing operation, storing information about the measured noise amount in each pixel, and removing photocharge corresponding to the information about the measured noise amount during image sensing.

Abstract: Various techniques are provided to perform flat field correction for infrared cameras. In one example, a method of calibrating an infrared camera includes calibrating a focal plane array (FPA) of the infrared camera to an external scene to determine a set of flat field correction values associated with a first optical path from the external scene to the FPA. The method also includes calibrating the FPA to a shutter of the infrared camera to determine a set of flat field correction values associated with a second optical path from the shutter to the FPA. The method also includes using the flat field correction values associated with the first and second optical paths to calculate a set of supplemental flat field correction values to apply to thermal image data obtained with the infrared camera. The method also includes storing the supplemental flat field correction values.