FLICKER DETECTION USING SEMICONDUCTOR LIGHT SOURCE

摘要

Devices and methods for adjusting an exposure window of a rolling shutter based on a frequency determined from ambient light gathered by a bimodal component are disclosed. Flickering light sources may cause artifacts in captured images, due to interplay between a period of a frequency of ambient light and the exposure window. An image capture device includes a semiconductor component configured to operate in two modes and an exposure window control component configured to compensate for the flickering based on a signal from the light source. In a sensor mode, the semiconductor component may operate to detect the frequency of ambient light. To avoid image artifacts, the frequency of the ambient light is analyzed and an exposure time is adjusted to an integer multiple of the period of the frequency such that exposure is matched to the periodic illumination of the flickering light source.

主权项

1. A device, comprising:
an image sensor configured to capture image data for an image in the image sensor's field of view, wherein the image data is captured based at least in part on rolling shutter exposure; a semiconductor component configured to operate in a plurality of modes, each mode associated with particular functionality; and an exposure window control component configured to:
determine, based at least in part on a signal from the semiconductor component, a frequency of the ambient light within at least a portion of the image sensor's field of view, andinstruct modification, based at least in part on the determined frequency of the ambient light, of an exposure window for capturing portions of the image data according to the rolling shutter exposure.