公开(公告)号：US20190213718A1

公开(公告)日：2019-07-11

申请号：US15865880

申请日：2018-01-09

Applicant: OmniVision Technologies, Inc.

Inventor： Fanbo DENG ,  Chengming LIU ,  Sarvesh Swami

IPC: G06T5/00 ,  H04N5/341 ,  H04N5/235 ,  H04N1/407

Abstract: A method for determining exposure levels of an image-sensor pixel array includes (a) storing a first plurality of pixel values representing a first captured image, captured with the image sensor in an applied exposure configuration, each distinct region of the pixel array having a respective first exposure level, (b) determining pixel-value global statistics, (c) estimating, from the global statistics, a global pixel value of the first captured image, (d) determining, for each distinct region, a respective local statistics of the first pixel values, (e) assigning, to each distinct region, a respective scale factor based on the local statistics of the distinct region, (f) determining a refined exposure configuration including, for each distinct region, a second exposure level proportional to a product of its respective first exposure level and its respective scale factor, and (g) capturing second pixel values with the image sensor configured in the refined exposure configuration.