| 摘要 |
Infrared light emitted by a fluorescent material is weak. When an infrared image obtained by this fluorescent material is superposed and displayed on a visible-light image, the infrared image is made clear. A signal <IR> of an IR pixel having selective sensitivity to infrared light is subtracted from RGB pixel signals <R>, <B>, and <G> of a solid-state image sensor by adders ( 20 ), and signals R<SUB>0</SUB>, G<SUB>0</SUB>, and B<SUB>0 </SUB>that correspond to the R, G, and B components of incident light within <R>, <G>, and <B> are separated and extracted. <IR> is multiplied by each of the gains kappa<SUB>R</SUB>, kappa<SUB>G</SUB>, and kappa<SUB>B </SUB>to enhance the IR component by multipliers ( 22 ), and each is synthesized with R<SUB>0</SUB>, G<SUB>0</SUB>, and B<SUB>0 </SUB>by adders ( 24 ). kappa<SUB>R</SUB>, kappa<SUB>G</SUB>, and kappa<SUB>B </SUB>are set so that the infrared image displayed on the visible-light image by the synthesized IR component is enhanced and displayed in a hue that can be distinguished from the color white or another visible-light image.
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