Detecting scintillation bands using multiple exposure sensors

• Main Author: H.P.RUAN
• Format: Patent
• Language: Chinese; English
• Published: 20.09.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

Because some sensor rows are exposed to different light intensities than other sensor rows, an alternating current (AC) light source may use a rolling shutter such that the captured image includes alternating darker and brighter regions (referred to as flicker bands). A flicker band may be compensated by extracting the flicker band from an image captured using an exposure that at least partially overlaps in time. Due to the overlap, the images may be subtracted from each other such that the scene content substantially cancels, leaving a flicker band. The images may be for the same frame captured by at least one sensor, such as different exposures of the frame. For example, images for extracting scintillation bands may be captured using different exposure times that share a common start time, such as using a multi-exposure sensor that reads out light values at different times during light integration. Two or more images captured for a frame may be used for flicker band extraction, such as two images including