Focus specification and focus stabilization

摘要

An imaging device may be configured to monitor a field of view for various objects or events occurring therein. The imaging device may capture a plurality of images at various focal lengths, identify a region of interest including one or more semantic objects therein, and determine measures of the levels of blur or sharpness within the regions of interest of the images. Based on their respective focal lengths and measures of their respective levels of blur or sharpness, a focal length for capturing subsequent images with sufficient clarity may be predicted. The imaging device may be adjusted to capture images at the predicted focal length, and such images may be captured. Feedback for further adjustments to the imaging device may be identified by determining measures of the levels of blur or sharpness within the subsequently captured images.

主权项

1. An imaging device comprising:
a lens; an imaging sensor having a photosensitive surface with a first plurality of pixel sensors; at least one memory device; and at least one computer processor, wherein the at least one computer processor is configured to at least:
capture a first image, wherein the first image is captured with the lens at a first focal length from the imaging sensor, and wherein the first image is captured at a first level of resolution;recognize at least one object within the first image;automatically define a region of interest within the first image based at least in part on the at least one object within the first image; anddetermine a first blur metric associated with the region of interest within the first image;adjust the lens to a second focal length from the imaging sensor;capture at least a second image, wherein the second image is captured with the lens at the second focal length from the imaging sensor, and wherein the second image is captured at a second level of resolution;recognize the at least one object within the second image;automatically identify the region of interest within the second image based at least in part on the at least one object within the second image;determine a second blur metric associated with the region of interest within the second image;determine a third focal length for capturing a third image based at least in part on at least one of the first focal length, the first blur metric, the second focal length or the second blur metric;adjust the lens to the third focal length from the imaging sensor; andcapture the third image, wherein the third image is captured with the lens at the third focal length from the imaging sensor, wherein the third image is captured at a third level of resolution, and wherein the third level of resolution exceeds at least one of the first level of resolution or the second level of resolution.