1. A system for smoke detection during an anatomical surgery, said system comprising: one or more circuits in an image processing engine communicatively coupled to an image-capturing device, wherein said image-capturing device is configured to capture one or more video frames, said one or more circuits being configured to: estimate a partially visible region in a current video frame based on a temporal difference between said current video frame and a previous video frame received from said image-capturing device; detect one or more candidate pixels in said estimated partially visible region in said current video frame; and determine a smoke region in said partially visible region based on pruning of said detected one or more candidate pixels.