Publications (1)1.61 Total impact
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ABSTRACT: An instrument has been built to store the digital signals from a modified imaging infrared scanner directly in a digital memory. This procedure avoids the signal‐to‐noise degradation and dynamic range limitations associated with successive analog‐to‐digital and digital‐to‐analog conversions and the analog recording method normally used to store data from the scanner. This technique also allows digital data processing methods to be applied directly to recorded data and permits processing and image reconstruction to be done using either a mainframe or a microcomputer. If a suitable computer and CAMAC‐based data collection system are already available, digital storage of up to 12 scanner images can be implemented for less than $1750 in materials cost. Each image is stored as a frame of 60×80 eight‐bit pixels, with an acquisition rate of one frame every 16.7 ms. The number of frames stored is limited only by the available memory. Initially, data processing for this equipment was done on a VAX 11‐780, but images may also be displayed on the screen of a microcomputer. Software for setting the displayed gray scale, generating contour plots and false‐color displays, and subtracting one image from another (e.g., background suppression) has been developed for IBM‐compatible personal computers.