Multiple image overlay storage methods
Peter F. Mueller · NASA STI Repository (National Aeronautics and Space Administration)
The primary objective of this study was to demonstrate the image quality achievable with current optical multiplexing techniques.If acceptable, these techniques will significantly reduce film consumption in the distribu tion of distortion-free ERTS imagery.The study was conducted over a nine-month period and was restricted to 35 millimeter image formats and up to twelve channel multiplex recordings.The results indicate that seven carrier-modulated images can be overlayed on a single film frame and retrieved substantially free from crosstalk and dimensional distortion.Resolution was maintained at 10 line-pairs per millimeter, and the gray scale was reproduced essentially linear over a 100 to 1 brightness dynamic range.Based on these results, we recommend that the techniques be de monstrated with seven spectral zones of ERTS imagery in spatial registra tion at full size format.