Automatic exposure control based on multiple regions

摘要

Systems, methods, and computer readable media for performing auto-exposure operations in a digital image capture device. An image capture device's auto-exposure settings may be automatically adjusted by generating and then combining, in a dynamically weighted fashion, two sets of exposure values. One set of exposure values may be based on detected faces while the other set may be based on the image as a whole. Each set of exposure values may include a “measured” value and a “target” value, wherein each of these values may, in turn, be based on one or more (different) aspects of the image. Illustrative digital image capture devices in which the disclosed technology may be used include, but are not limited, to portable digital cameras, mobile telephones, personal digital assistants, mobile music and video devices, and portable computer platforms such as notebook and tablet computers.

主权项

1. A non-transitory program storage device comprising instructions stored thereon to cause one or more processors to:
capture a first digital image of a scene using a first exposure value; obtain image statistics for the first digital image; determine a measured exposure value of an identified face in the digital image based, at least in part, on the image statistics; determine a measured exposure value of the scene based, at least in part, on the image statistics; determine a target exposure value of the identified face based, at least in part, on the image statistics; determine a target exposure value of the scene based, at least in part, on the image statistics; determine an overall measured exposure value based, at least in part, on the measured exposure value of the scene and the measured exposure value of the identified face; determine an overall target exposure value based, at least in part, on the target exposure value of the scene and the target exposure value of the identified face; and adjust the first exposure value to create a second exposure value based, at least in part, on the overall measured exposure value and the overall target exposure value.