Patent ID: 10931925

Abstract:
The present invention relates to a monitoring camera having an autofocusing function based on a composite filtering robust against a change in visibility status and a video monitoring system employing the same. The present invention comprises: a hardware filter for blocking one of a visible light band and an infrared light band and allowing the other thereof to pass therethrough; and a software filter for filtering a color image or a black-and-white image generated by an image signal processor (ISP) by removing, from the color image or the black-and-white image, a factor reducing a visibility distance at the front side of a lens part, wherein the filtering band of the hardware filter and whether to perform filtering by the software filter are controlled according to a filtering level corresponding to a current visibility status at the front side of the lens part among a plurality of filtering levels. Therefore, the present invention can provide an image which is always clear enough to enable a target object to be identified regardless of a visibility status at the front of a monitoring camera, and an accurate autofocusing function can be provided constantly regardless of the visibility status in front of the monitoring camera by performing autofocusing using analysis of an image provided through stepwise composite filtering.