Patent ID: 7474334

Claim:
An imaging system for detecting an object on or below a water surface, the imaging system comprising: a multispectral optical sensor that separates a received unprocessed image of the object into a first unprocessed image and a second unprocessed image that is spatially and temporally registered with the first unprocessed image, and that generates a first signal corresponding to the first unprocessed image and a second signal corresponding to the second unprocessed image; a processing unit that receives said first and second signals and manipulates said first and second signals by taking a weighted difference of said first and second signals to generate a third signal corresponding to a processed image; and a monitor that receives the third signal and displays the processed image; wherein the processing unit is operably connected to the multispectral optical sensor and to the monitor; and wherein the first unprocessed image is in a first frequency bandwidth and the second unprocessed image is in a second frequency bandwidth that is less water-penetrating than the first frequency bandwidth.