Conversion Between Aspect Ratios in Camera

摘要

A camera system captures an image in a source aspect ratio and applies a transformation to the input image to scale and warp the image to generate an output image having a target aspect ratio different than the source aspect ratio. The output image has the same field of view as the input image, maintains image resolution, and limits distortion to levels that do not substantially affect the viewing experience. In one embodiment, the output image is non-linearly warped relative to the input image such that a distortion in the output image relative to the input image is greater in a corner region of the output image than a center region of the output image.

主权项

1. A method for converting between aspect ratios, comprising:
obtaining an input image having a source aspect ratio; applying, by a processing device, a transformation to the input image to scale and warp the image to generate an output image having a target aspect ratio, the target aspect ratio different than the source aspect ratio, the output image non-linearly warped relative to the input image such that a distortion in the output image relative to the input image is greater in a corner region of the output image than a center region of the output image, wherein applying the transformation comprises:
shifting a pixel of the input image along a first axis as a non-linear function of an original pixel position of the pixel along the first axis, independently of an original pixel position of the pixel along a second axis perpendicular to the first axis; andshifting the pixel of the input image along the second axis as a non-linear function of the original pixel position of the pixel along the first and second axes; and outputting the output image having the target aspect ratio.