Camera calibration and automatic adjustment of images

摘要

Techniques and apparatus for automatic upright adjustment of digital images. An automatic upright adjustment technique is described that may provide an automated approach for straightening up slanted features in an input image to improve its perceptual quality. This correction may be referred to as upright adjustment. A set of criteria based on human perception may be used in the upright adjustment. A reprojection technique that implements an optimization framework is described that yields an optimal homography for adjustment based on the criteria and adjusts the image according to new camera parameters generated by the optimization. An optimization-based camera calibration technique is described that simultaneously estimates vanishing lines and points as well as camera parameters for an image; the calibration technique may, for example, be used to generate estimates of camera parameters and vanishing points and lines that are input to the reprojection technique.

主权项

1. A method implemented by one or more computing devices, the method comprising:
applying, by the one or more computing devices, a camera calibration technique to estimate camera parameters for an image of a scene by identifying a first orthogonal frame having a first set of orthogonal directions and one or more additional orthogonal frames having orthogonal directions that do not align to the first set of orthogonal directions; and adjusting, by the one or more computing devices, alignment of one or more features of the image using the estimated camera parameters.