| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a rise in dark space level and a decrease in contrast of a video signal even in fog absorbing near infrared light and in fine soil dust absorbing blue light. <P>SOLUTION: The imaging apparatus includes: a visible light/near infrared light lens; a visible light/near infrared light imaging element; a video signal processing function; and a plurality of optical filters having a driving portion which is selectively inserted just before the imaging element. The plurality of optical filters include an optical filter transmitting only visible light and optical filters transmitting wavelength bands passing through water vapor of 600-700 nm, 740 nm, 780 nm, 860 nm, 1040 nm, 1200 to 1250 nm and 1550 to 1650 nm. When the dark space level of the video signal of the visible light is raised, images are picked up with the optical filters trnsmitting the wavelength bands passing through the water vapor, and their dark space levels are compared. The picked up video of the wavelength band whose dark space level is the lowest is outputted. A vertical horizontal frequency being the center of emphasis of multi-pixel outline correction is lowered to reduce a black level to thereby correct the dark space rise. <P>COPYRIGHT: (C)2012,JPO&INPIT |
