Abstract: A method of determining a temperature of an element in a scene includes providing a set of targets each characterized by a target temperature and measuring pixel output values for pixels in a detector array for the targets in the set of targets. Measuring pixel output values is performed at a plurality of detector temperatures. The method also includes mapping each pixel output value to one of a plurality of constant values, each of the plurality of constant values being associated with one of the target temperatures, assembling a scene temperature profile using the mapped pixel output values, and obtaining an image of the scene including the element, wherein the element is associated with a pixel of the detector array. The method further includes determining a pixel value associated with the element and computing the temperature of the element using the scene temperature profile.

Abstract: A method of performing non-uniformity correction for an imaging system includes receiving image data from a detector. The method also includes retrieving stored correction coefficients from the memory. The method also includes retrieving a stored factory calibration reference frame. The method also includes acquiring an operational calibration reference frame. The method also includes computing updated correction coefficients based on the stored correction coefficients, the stored factory calibration reference frame, and the operational calibration reference frame. The method also includes computing the non-uniformity correction based on the updated correction coefficients. The method also includes forming a corrected image by applying the non-uniformity correction to the image data. The method further includes outputting the corrected image.

Abstract: A system and method for using a relief object image generator for cursor control, computer access control, and operational parameter control is disclosed. The system includes a relief object image generator, a sensor array, an image processor, and a memory. The relief object image generator generates images of relief objects, such as fingerprints, brought in proximity of the exposed surface of the image generator. The image processor receives the image from the sensor array, processes the image, and compares the resulting descriptive information to stored information corresponding to authorized users. If a match is found, the user is granted access to the computer. The image processor may also process the image to determine image movement or the image's presence or absence. Detected movement is used to generate directional signals while the presence and abserice of the image is used to generate highlight and select signals.