Armstrong, Nikaido, Marmelstein, Kubovcik & Murray
Color imaging apparatus including a means for electronically non-linearly expanding and compressing dynamic range of an image signal
 A color imaging apparatus includes means for electronically non-linearly expanding or compressing the dynamic range of an image signal output therefrom. Separate output signals of respective brightness for different colors are logarithmically compressed, inverse-logarithmically converted, then linear-matrix-converted and multipled by a compression factor of brightness level for the respective color signals to produce a logarithmically compressed color signal without varying the tone. 
Olympus Optical Co., Ltd.
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Tatsuo Hiroyoshi Hidetoshi
Nagasaki Fujimori Yamada