System and method for head size equalization in 360 degree panoramic images
First Claim
1. A method for performing real-time correction of a panoramic image, comprising:
- obtaining panoramic pixel coordinates from an a approximately 360 degree panoramic image;
generating a warp table by applying a Spartially Varying Uniform (SVU) scaling function to the panoramic pixel coordinates wherein generating a warp table further comprises;
specifying source curves;
specifying a warping factor; and
computing target curves using the source curves and the warping factor wherein the source curves further comprise a bottom source curve, wherein the bottom source curve is defined by the horizontal feature geometry, and a top source curve;
vertically scaling the panoramic image pixel coordinates using the SVU scaling function to create vertically-scaled panoramic image pixel coordinates wherein vertically scaling comprises using a main scaling factor to scale the panoramic image pixel coordinates in the vertical direction and wherein the main scaling factor is computed using the source curves and target curves;
horizontally scaling the vertically-scaled panoramic image pixel coordinates using the SVU scaling function to create a preliminary warp table containing preliminary pixel coordinates; and
performing horizontal distortion correction on the preliminary warp table using the SVU scaling function to create the warp table; and
warping the panoramic image using the warp table and the geometry of horizontal features in the panoramic image to create a corrected panoramic image.
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Abstract
A real-time approximately 360 degree image correction system and a method for alleviating distortion and perception problems in images captured by omni-directional cameras. In general, the real-time panoramic image correction method generates a warp table from pixel coordinates of a panoramic image and applies the warp table to the panoramic image to create a corrected panoramic image. The corrections are performed using a parametric class of warping functions that include Spatially Varying Uniform (SVU) scaling functions. The SVU scaling functions and scaling factors are used to perform vertical scaling and horizontal scaling on the panoramic image pixel coordinates. A horizontal distortion correction is performed using the SVU scaling functions at at least two different scaling factors. This processing generates a warp table that can be applied to the panoramic image to yield the corrected panoramic image. In one embodiment the warp table is concatenated with a stitching table used to create the panoramic image.
89 Citations
16 Claims
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1. A method for performing real-time correction of a panoramic image, comprising:
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obtaining panoramic pixel coordinates from an a approximately 360 degree panoramic image; generating a warp table by applying a Spartially Varying Uniform (SVU) scaling function to the panoramic pixel coordinates wherein generating a warp table further comprises; specifying source curves; specifying a warping factor; and computing target curves using the source curves and the warping factor wherein the source curves further comprise a bottom source curve, wherein the bottom source curve is defined by the horizontal feature geometry, and a top source curve; vertically scaling the panoramic image pixel coordinates using the SVU scaling function to create vertically-scaled panoramic image pixel coordinates wherein vertically scaling comprises using a main scaling factor to scale the panoramic image pixel coordinates in the vertical direction and wherein the main scaling factor is computed using the source curves and target curves; horizontally scaling the vertically-scaled panoramic image pixel coordinates using the SVU scaling function to create a preliminary warp table containing preliminary pixel coordinates; and performing horizontal distortion correction on the preliminary warp table using the SVU scaling function to create the warp table; and warping the panoramic image using the warp table and the geometry of horizontal features in the panoramic image to create a corrected panoramic image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for performing real-time correction of a panoramic image, comprising:
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obtaining panoramic pixel coordinates from an approximately 360 degree panoramic image; generating a warp table by applying a Spatially Varying Uniform (SVU) scaling function to the panoramic pixel coordinates wherein the warp table is computed from user-specified table dimensions and camera parameters; and warping the panoramic image using the warp table and the geometry of horizontal features in the panoramic image to create a corrected panoramic image. - View Dependent Claims (10)
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11. A method for correcting distortion of an approximately 360 degree panoramic image, comprising:
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inputting a set of images; inputting image pixel coordinates corresponding to pixel coordinates of an imaginary panoramic image created from the input set of images; using Spatially Varying Uniform (SVU) scaling functions having scaling factors to generate a warp table containing corrected pixel coordinates which correct for image distortion; concatenating a stitching table used to create the imaginary panoramic image with the warp table; and creating a corrected panoramic image from the input set of images using the concatenated warping and stitching table. - View Dependent Claims (12, 13, 14)
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15. A computer-readable medium having computer-executable instructions for real-time correction and viewing of a panoramic image, comprising:
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generating a warp table to warp the pixels in a sequence of images used to create a panoramic image, further comprising; specifying source curves on the panoramic image; specifying a warping factor corresponding to an amount of warping applied to tie panoramic Image pixel coordinates; computing target curves using the source curves and the warping factor; computing a main scaling factor using the source curves and the target curves; using the main scaling factor to scale the panoramic image pixel coordinates to generate the warp table; concatenating the warp table with a stitching table used to create the panoramic image and applying the concatenated warp and stitching table while stitching the sequence of images into a corrected panoramic image. - View Dependent Claims (16)
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Specification