公开(公告)号：US11653100B2

公开(公告)日：2023-05-16

申请号：US17682435

申请日：2022-02-28

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Andreas Irestål

IPC: H04N23/73 ,  H04N23/54

CPC classification number: H04N23/73 ,  H04N23/54

Abstract: An exposure time controller for controlling an exposure time (ET) variable of a video camera, which is associated with an auto-exposure algorithm configured to reduce an exposure mismatch (ΔE) by incrementing and decrementing the ET variable, which comprises: a memory for recording ET values applied while the video camera is imaging a scene and the algorithm is active; and processing circuitry configured to: determine that the exposure mismatch exceeds a threshold while the video camera is imaging the scene; estimate a distribution of the recorded ET values; based on the estimated distribution, identify multiple relatively most frequent ET values; and, in reaction to determining that the exposure mismatch exceeds the threshold, assign one of the identified ET values to the ET variable.