Noise level based exposure time control for sequential subimages

摘要

A sequence of multiple subimages is captured by an imaging sensor organized in multiple subsets of pixels. Each of the subsets of pixels is assigned to capturing a corresponding one of the subimages. For each of the subsets of pixels, a noise level of an output of the pixels of the subset is measured. Depending on the measured noise level, an exposure time for capturing the corresponding subimage is controlled.

主权项

1. A method of imaging a scene, the method comprising:
capturing a sequence of multiple subimages by an imaging sensor organized in multiple subsets of pixels, each of the subsets of pixels being assigned to capturing a corresponding one of the subimages; and for each of the subsets of pixels:
obtaining samples of an output signal of the subsets of pixels during the exposure time;processing the obtained samples to evaluate the noise level and an averaged output signal;in response to the noise level being above a threshold, extending the exposure time to obtain further samples of the output signal of the pixels; andin response to the noise level being below the threshold, ending the exposure time for capturing the subimage.