Method and system for adaptive perspective correction of ultra wide-angle lens images
AssigneeGeo Semiconductor Inc.
InventorZorawar Singh Bassi
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Abstract
Methods for correcting an image acquired through an Ultra Wide-Angle (UWA) lens is disclosed, where the entire image is mapped via a transformation that substantially improves the perspective, yet maintains all image information. Additional locally adaptive transformations can be applied to regions of interest in the image to fully restore the perspective. This de-warping scheme allows for flexible manipulation of the image while no content would be lost.
Claims27
A method for transforming an input image captured through at least one ultra wide-angle (UWA) lens, said UWA lens characterized by a corresponding transformation that maps 3D object space onto a plane that displays the input image, said method comprising:
- (a) obtaining the input image data captured through the at least one UWA lens;
- (b) constructing a 2D surface envelope that fully encompasses field of view of the at least one UWA lens;
- (c) constructing an envelope transformation that maps an output image plane onto the surface envelope;
- (d) concatenating the UWA lens map and the envelope transformation to obtain a zero-content-loss transformation;
- and
- (e) applying the zero-content-loss transformation to the input image data to obtain an output image;
- such that image perspective is substantially improved in the output image.
An electronic processor for transforming an image captured through at least one ultra wide-angle (UWA) lens, said UWA lens characterized by a corresponding transformation that maps 3D object space onto a plane that displays the input image, said processor comprising:
- (a) means to obtain input image data captured through the at least one UWA lens;
- (b) means to select a 2D surface envelope that contains field of view of the at least one UWA lens;
- (c) means to construct an envelope transformation that maps an output image plane onto the surface envelope;
- (d) means to concatenate the UWA lens map and the envelope transformation to obtain a zero-content-loss transformation;
- and
- (e) means to apply the zero-content-loss transformation to the input image data to obtain an output image;
- such that image perspective is substantially improved in the output image.
Dependencies are inferred from the claim text.