Abstract: A method includes flashing an object with a first illumination pulse at a first illumination power level, flashing the object with a second illumination pulse at a second illumination power level different from the first illumination power level, integrating at least a portion of a first return pulse which is the first illumination plus returning from the object to determine a first return time, and integrating at least a portion of a second return pulse which is the second illumination pulse returning from the object to determine a second return time. The method includes using the first and second return times to determine distance to the object independent of reflectivity of the object.

Abstract: An optical assembly includes a window having an interior surface and an opposed exterior surface. A perimeter surface connects between the interior surface and the exterior surface. A metal layer is bonded to the perimeter surface of the window. An anti-reflective coating (ARC) is bonded to the interior surface of the window. A metallic lid is joined to the metal layer for enclosing a focal plane array (FPA) aligned with the window.

Abstract: A method of medical imaging is provided. The method includes receiving pulsed light emissions from fluoroscopic material in a target field of a patient, wherein the target field was treated with fluoroscopic material that emitted the pulsed light emissions in response to a pulsed laser signal. The pulsed laser signal has a wavelength that was selected to excite the fluoroscopic material. The method further includes capturing a passive image of the target field and asynchronously detecting pulses of the pulsed light emissions. The method further includes determining pulse-source coordinates in the image, wherein the pulse-source coordinates correspond to a location of the fluoroscopic material that emitted the pulsed light emissions.

Abstract: A method includes flashing an object with a first illumination pulse at a first illumination power level, flashing the object with a second illumination pulse at a second illumination power level different from the first illumination power level, integrating at least a portion of a first return pulse which is the first illumination plus returning from the object to determine a first return time, and integrating at least a portion of a second return pulse which is the second illumination pulse returning from the object to determine a second return time. The method includes using the first and second return times to determine distance to the object independent of reflectivity of the object.

Abstract: An optical assembly includes a window having an interior surface and an opposed exterior surface. A perimeter surface connects between the interior surface and the exterior surface. A metal layer is bonded to the perimeter surface of the window. An anti-reflective coating (ARC) is bonded to the interior surface of the window. A metallic lid is joined to the metal layer for enclosing a focal plane array (FPA) aligned with the window.

Abstract: A method of image enhancement includes constructing an input histogram corresponding to an input image received at a focal plane array. The method includes performing histogram equalization on a first band of the input histogram starting from a zero value and ending at a division value representing a pixel bin value where a predetermined fraction of the input histogram by pixel hound is reached to produce a first portion of an equalization curve. The method includes performing histogram equalization on a second band of the input histogram starting from the division value and ending at a pixel bin value where all of the input histogram by pixel count is reached to produce a second portion of the equalization curve. The method includes applying the equalization curve to the input image to produce a corresponding enhanced image.

Abstract: An imaging device includes a camera and an illuminator. The illuminator is positioned and configured to illuminate an article through an illuminator tunable filter disposed along an optical axis and capture an image of the article through a camera tunable filter arranged along the optical axis. Imaging arrangements and imaging methods are also described.

Abstract: A method of image enhancement includes constructing an input histogram corresponding to an input image received at a focal plane array. The method includes performing histogram equalization on a first band of the input histogram starting from a zero value and ending at a division value representing a pixel bin value where a predetermined fraction of the input histogram by pixel hound is reached to produce a first portion of an equalization curve. The method includes performing histogram equalization on a second band of the input histogram starting from the division value and ending at a pixel bin value where all of the input histogram by pixel count is reached to produce a second portion of the equalization curve. The method includes applying the equalization curve to the input image to produce a corresponding enhanced image.

Abstract: An optics arrangement includes a polarized beam splitter arranged along an collection axis, a first quarter waveplate arranged along the collection axis, and a second quarter waveplate. The second quarter waveplate is arranged along the collection axis and is optically coupled to the first quarter waveplate by the polarized beam splitter to limit return of polarized illumination originating in a scene being illuminated for retroreflector detection. Retroreflector detectors and methods of imaging a scene are also described.

Abstract: A method for diagnosing a condition of a subject includes imaging an abdominal area of the subject to obtain one or more images of the abdominal area. Separation between rectus abdominis muscles in the abdominal area is located from the one or more images. Distance of the separation between the rectus abdominis muscles is quantified. The results of the quantified distance and one or more images are outputted on one or more display units.

Abstract: An imaging device includes a camera and an illuminator. The illuminator is positioned and configured to illuminate an article through an illuminator tunable filter disposed along an optical axis and capture an image of the article through a camera tunable filter arranged along the optical axis. Imaging arrangements and imaging methods are also described.

Abstract: An optics arrangement includes a polarized beam splitter arranged along an collection axis, a first quarter waveplate arranged along the collection axis, and a second quarter waveplate. The second quarter waveplate is arranged along the collection axis and is optically coupled to the first quarter waveplate by the polarized beam splitter to limit return of polarized illumination originating in a scene being illuminated for retroreflector detection. Retroreflector detectors and methods of imaging a scene are also described.

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 method for diagnosing a condition of a subject includes imaging an abdominal area of the subject to obtain one or more images of the abdominal area. Separation between rectus abdominis muscles in the abdominal area is located from the one or more images. Distance of the separation between the rectus abdominis muscles is quantified. The results of the quantified distance and one or more images are outputted on one or more display units.

Abstract: An imaging system includes a housing having a lens defining a first optical axis. A first sensor is within the housing aligned with the first optical axis. A second sensor is within the housing offset from the first optical axis. A third sensor is within the housing opposite from the second sensor across the first optical axis. A second optical axis is defined between the second and third sensors. A polarized beam splitter is within the housing at an intersection of the first and second optical axes to redirect a portion of incoming photons to the second sensor. A bandpass filter is between the polarized beam splitter and the second sensor to pass a portion of photons traveling from the polarized beam splitter to the second sensor and to reflect a remaining portion of the photons back to the polarized beam splitter.

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.