Wide area coverage infrared search system

H - Electricity – 04 – N

Patent

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Details

H04N 7/18 (2006.01) H04N 5/45 (2006.01)

Patent

CA 2140681

An imaging system wherein two field-of-views (FOVs) images of a scene are obtained and displayed as a single image so that both FOVs can be viewed simultaneously by an observer. This imagining system is particularly directed to infrared (IR) imaging of a scene which is useful for search-and-rescue (SAR) operations. One IR image sensor provides a low resolution, high sensitivity, wide field-of-view (WFOV) image of the scene which is displayed as a large, low resolution, WFOV image on a display apparatus. A second IR sensor provides a high resolution narrow field-of-view (NFOV) image of a selected portion of the scene wherein the second sensor's NFOV optics can be directed to any particular area within the WFOV. That smaller NFOV image is also displayed, by the display apparatus, within the WFOV displayed image and it is displayed at the same area in the WFOV image as that actually covered by the NFOV, the NFOV image displacing the WFOV image of that area with the two images being fused together into a single image by the display apparatus. This is rather similar in operation to an observer's eye which has a high resolution central NFOV vision and a very large FOV peripheral vision that has low resolution but a high sensitivity to detection of any anomaly. By using an eye movement tracking system to aim the NFOV image detector and the position that the NFOV image is displayed, an observer's central vision can always be directed to the high resolution NFOV image with that observer's peripheral vision simultaneously viewing the WFOV low resolution image.

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