5 January 1993 Neuromorphic infrared focal plane performs on-plane local contrast enhancement, spatial, and temporal filtering
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Abstract
An infrared focal plane has been simulated, designed and fabricated which mimics the form and function of the vertebrate retina. The "Neuromorphic" focal plane has the capability of performing real-time local contrast enhancement, much like the response of the human eye, and operates without saturation over an extremely wide dynamic range due to its logarithmic photoresponse. The device makes use of an indium antimonide detector array with a 3 -5pm spectral response, and a switched capacitor network to compute a real-time 2D spatial average. A gaussian subtraction method is used to produce the pixel output which when displayed produces an image with enhanced edges, representing spatial and temporal derivatives in the scene. The spatial and temporal responses of the device are tunable during operation, permitting the operator to "peak up" the response of the array to spatial and temporally-varying signals, Such an array will adapt to ambient illumination conditions without loss of detection performance. The need to post-process infrared images using digital techniques is thus reduced; seekers making use of this technology could be made smaller due to the reduction of off-plane processing hardware. This paper will review the Neuromorphic infrared focal plane from initial operational simulations to detailed design characteristics, and will conclude with a presentation of preliminary operational data for the device.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark A. Massie, James T. Woolaway, Buu L. Huynh, Greg A. Johnson, Jon Paul Curzan, "Neuromorphic infrared focal plane performs on-plane local contrast enhancement, spatial, and temporal filtering", Proc. SPIE 1762, Infrared Technology XVIII, (5 January 1993); doi: 10.1117/12.138977; https://doi.org/10.1117/12.138977
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