Methods and apparatus for performing exposure estimation using a time-of-flight sensor

摘要

This application relates to capturing an image of a target object using information from a time-of-flight sensor. In one aspect, a method may include a time-of-flight (TOF) system configured to emit light and sense a reflection of the emitted light and may determine a return energy based on the reflection of the emitted light. The method may measure a time between when the light is emitted and when the reflection is sensed and may determine a distance between the target object and the TOF system based on that time. The method may also identify a reflectance of the target object based on the return energy and may determine an exposure level based on a distance between the target object and a reflectance of the target object.

主权项

1. An imaging apparatus, comprising:
a time-of-flight (TOF) system configured to determine a distance to a target object and determine a reflectance of the target object; a flash circuit configured to emit a pre-flash and a main flash to illuminate the target object; and a processor in communication with the TOF system and the flash circuit, the processor configured to:
determine a first exposure level based on the distance to the target object and the reflectance of the target object,control the flash circuit to emit the pre-flash at an output level based on the first exposure level,determine a second exposure level of the target object based on the illumination of the target object by the pre-flash,control the flash circuit to emit the main flash, the main flash having an output level based on the second exposure level, andcontrol a camera of the imaging apparatus to capture an image of the target object while the target object is illuminated by the main flash.