公开(公告)号：US11128824B2

公开(公告)日：2021-09-21

申请号：US16711198

申请日：2019-12-11

Applicant: STMICROELECTRONICS SA

Inventor： Arnaud Bourge ,  Antoine Drouot ,  Gwladys Hermant

IPC: H04N5/361 ,  H04N5/217 ,  H04N5/232

Abstract: A system has an array of pixels including a plurality of active pixels and a plurality of dark reference pixels and processing circuitry coupled to the array of pixels. The processing circuitry sequentially computes, for each of a plurality of pairs of sets of dark reference pixels of the plurality of dark reference pixels, absolute differences in dark signal levels of the pair of sets of dark reference pixels. The absolute differences in dark signal levels are accumulated and a noise level of the dark reference pixels of the array of pixels is estimated based on the accumulated absolute differences. The system may be employed in, for example, a back-up camera of an automobile or a mobile phone.