Abstract: An imaging system includes a readout integrated circuit (ROIC) is operatively connected to receive photocurrent from a plurality of photodetectors (e.g., from a plurality of photodetectors of a photodetector array (PDA)). An event detection circuit in each ROIC pixel readout circuit generates binary output data, wherein the ROIC compresses the binary output data with a logical summary binning of N×M pixel binary outputs into a single summary output bit. The ROIC can be configured to receive image data from the photodetectors to form an image at a first frame rate, and to receive the binned binary data from the photodetectors at a second frame rate higher than the first frame rate.

Abstract: An imaging system includes a housing having a lens that defines a first optical axis. A sensor is within the housing offset from the first optical axis. A digital display is within the housing offset from the first optical axis opposite from the sensor across the first optical axis. A second optical axis is defined between the sensor and the digital display. A polarized beam splitter is within the housing at an intersection of the first and second optical axes to allow a portion of incoming photons to pass and continue along the first optical axis for direct-eye viewing and to redirect another portion of incoming photons to the sensor along the second optical axis.

Abstract: A low noise infrared photodetector has an epitaxial heterostructure that includes a photodiode and a transistor. The photodiode includes a high sensitivity narrow bandgap photodetector layer of first conductivity type, and a collection well of second conductivity type in contact with the photodetector layer. The transistor includes the collection well, a transfer well of second conductivity type that is spaced from the collection well and the photodetector layer, and a region of first conductivity type between the collection and transfer wells. The collection well and the transfer well are of different depths, and are formed by a single diffusion.

Abstract: A method includes correcting for at least one of gain and offset during frame integration for photodetector events. Gain and offset correction is performed separately in each pixel of a digital read-out integrated circuit (DROIC) for a plurality of corresponding pixels in a photodetector array. First and second binary counters respectively use a gain register and an offset register to implement gain and offset correction.

Abstract: A method of normalizing FPA system gain for varying temperature includes determining an FPA temperature and calculating an FPA system gain as a function of the FPA temperature, system gain for the FPA at a reference temperature, and empirically derived coefficients. The method also includes applying the FPA system gain at the FPA temperature to condition output of the FPA to produce temperature independent image data. An imaging system includes a focal plane array (FPA). A temperature sensor is operatively connected to measure temperature of the FPA. A module is operatively connected to the FPA and temperature sensor to calculate FPA system gain for the FPA as described above, and to apply the FPA system gain to condition output of the FPA to produce temperature independent image data. There need be no temperature control device, such as a thermoelectric cooling device, connected for temperature control of the FPA.

Abstract: A method of enhancing an image includes constructing an input histogram corresponding to an input image received at a focal plane array, the input histogram representing a pixel intensity distribution corresponding to the input image and performing an analytical operation on the input histogram to produce a modified cumulative distribution, wherein the analytical operation is a function of camera temperature. The input image is transformed using the modified cumulative distribution to produce an enhanced output image corresponding to the input image, wherein at least a portion of the input image is enhanced in the output image. In addition to or in lieu of the non-linear operation, the binning edges of the input histogram can be adjusted based on at least one of camera temperature and sensitivity state to construct an adjusted cumulative distribution.

Abstract: A method of image-based quantification for allergen skin reaction includes imaging an area of skin that has been subject to a skin-prick test to produce one or more images of the area. The method includes identifying regions of wheal and/or flare in the one or more images of the area and quantifying weal and/or flare indicators based on the regions identified. The method also includes outputting results of the quantified wheal and/or flare indicators indicative of quantified allergen skin reaction.

Abstract: A method of inspecting a silicon article includes irradiating a silicon article with infrared radiation, transmitting a portion of the infrared radiation through the silicon article, and filtering the infrared radiation transmitted through the silicon article. Image data is acquired from the filtered infrared radiation and an image of the silicon article reconstructed from the image data. Based on the reconstructed image of the silicon article, one or more anomalies defined within the silicon article are identified.

Abstract: A method of normalizing FPA system gain and correcting pixel non-uniformity for varying temperature includes determining an FPA temperature, calculating an FPA system gain as a function of the FPA temperature, and applying the FPA system gain at the FPA temperature to condition output of the FPA to produce temperature independent image data. The method also includes calculating a non-uniformity correction map on a pixel by pixel basis for the FPA, wherein non-uniformity correction for each pixel is a function of the FPA temperature, and applying the non-uniformity correction map to the imaging data from the FPA to produce temperature dependent non-uniformity corrected image data. An imaging system includes a focal plane array (FPA), a temperature sensor operatively connected to measure temperature of the FPA, and a module configured for system gain correction and non-uniformity correction as described above.

Abstract: A radiation wavelength converter includes a detector configured to receive radiation of a first wavelength and to convert the radiation of a first wavelength to one or more electrical signals. The converter includes an integrated circuit (e.g., electrically connected to the detector to receive the one or more electrical signals) configured to amplify the one or more electrical signals. The converter also includes an emitter (e.g., formed on or attached to the integrated circuit and configured to be electrically connected to the integrated circuit to receive the one or more amplified electrical signals) configured to convert the one or more amplified electrical signals to radiation of a second wavelength.

Abstract: A multimode pixel of a pixel array is provided. The multimode pixel includes a photodetector, an image sensing circuit, a pulse detection circuit, and an image readout path coupled between the image sensing circuit and at least one readout conductor of the pixel array to transmit image signals from the image sensing circuit to the at least one readout conductor. The multimode pixel further includes a pulse readout path different from the image readout path, wherein the pulse readout path is coupled between the pulse detection circuit and the at least one readout conductor to transmit pulse data from the pulse detection circuit to the at least one readout conductor, and wherein the image readout path is controlled independently from the pulse readout path.

Abstract: An electronic device sealing arrangement includes a housing, an access door, a sealing member sized and configured to be sealingly compressed between the access door and the housing, a latch in operable communication with the housing and the access door, the latch being configured to compress the sealing member between the access door and the housing when moved to a position that latches the access door in a closed position, and a resilient member in operable communication with the latch and at least one of the housing and the access door, the resilient member being configured to at least partially compress when the access door is latched in the closed position and the sealing member is compressed between the access door and the housing.

Abstract: A wavefront sensing pixel is provided. The wavefront sensing pixel includes a low-pass filter filtering a charge signal from a photodetector and outputting a control signal when low-frequency signals are detected in the charge signal, and a control device to control flow of the charge signal past the control device based on whether a low-frequency signal is detected in the charge signal. The wavefront sensing pixel further includes a low-frequency signal path that receives a flow of signals that flow past the control device, and a high-frequency signal path independent of the low-pass filter and the control device, the high-frequency signal path receiving high-frequency signals included in the charge signal.

Abstract: A method of correcting pixel non-uniformity for varying temperature includes determining an FPA temperature and calculating a non-uniformity correction map on a pixel by pixel basis for the FPA, wherein the non-uniformity correction for each pixel is a function of the FPA temperature and empirically derived coefficients. The method also includes applying the non-uniformity correction map at the FPA temperature to condition output of the FPA to produce temperature dependent non-uniformity corrected image data. An imaging system includes a focal plane array (FPA). A temperature sensor is operatively connected to measure FPA temperature. A module is operatively connected to the FPA and temperature sensor to calculate and apply a non-uniformity correction map as described above. There need be no temperature control device for the FPA. The FPA can include a buffered current mirror pixel architecture, and can include an InGaAs material for infrared imaging.

Abstract: A method of image-based quantification for allergen skin reaction includes imaging an area of skin that has been subject to a skin-prick test to produce one or more images of the area. The method includes identifying regions of wheal and/or flare in the one or more images of the area and quantifying weal and/or flare indicators based on the regions identified. The method also includes outputting results of the quantified wheal and/or flare indicators indicative of quantified allergen skin reaction.

Abstract: An imaging and pulse detection (IPD) pixel array includes a plurality of imaging pixels arranged in a plurality of rows and columns. Each imaging pixel includes a respective photodetector that outputs signals in response to incident light and input laser pulses. The signals include imaging signals that correspond to the incident light and pulse signals that correspond to the input laser pulses. The IPD array further includes an isolation circuit associated with each of the respective imaging pixels, each isolation circuit outputting filtered output pulse signals in response to receiving the signals from the associated imaging pixel, the filtered output pulse signals corresponding to the pulse signals. The IPD array further includes a single pulse detection circuit that toggles between a charged and uncharged state corresponding to a pulse being received from at least one of the isolation circuits.

Abstract: A multimode pixel of a pixel array is provided. The multimode pixel includes a photodetector, an image sensing circuit, a pulse detection circuit, and an image readout path coupled between the image sensing circuit and at least one readout conductor of the pixel array to transmit image signals from the image sensing circuit to the at least one readout conductor. The multimode pixel further includes a pulse readout path different from the image readout path, wherein the pulse readout path is coupled between the pulse detection circuit and the at least one readout conductor to transmit pulse data from the pulse detection circuit to the at least one readout conductor, and wherein the image readout path is controlled independently from the pulse readout path.

Abstract: A system for parallax correction includes a first lens having a first pin extending radially therefrom and a second lens positioned parallel to the first lens. A moving platform has a first slot for accepting the first pin therein. The first slot is angled relative to the lenses to correct for parallax between the first and second lenses. The system can include an actuator for extending and retracting the moving platform towards and away from an object to focus on the object.

Abstract: An imaging pixel including a control device to control flow of a charge signal from a photodetector. The control device has a variable impedance that varies in response to frequency of an input signal, the control device being biased to permit signals to flow through the control device dependent on the frequency of signals being output by the photodetector. The imaging pixel further includes a low-frequency signal path that receives a flow of signals that flow through the control device, and a high-frequency signal path independent of the low-frequency signal path and the control device, the high-frequency signal path receiving high-frequency signals included in the charge signal.

Abstract: A lens cover includes a housing defining an optical aperture. A pair of opposed lens cover blades are each pivotally mounted to the housing at a common pivot point. A biasing member biases the blades apart from one another about the pivot point to uncover the optical aperture in an open position. A pair of magnetic members is included, each magnetic member being mounted to a respective one of the blades to bias the blades together to cover the optical aperture in a closed position.