Apparatus and methods for the optimal stitch zone calculation of a generated projection of a spherical image
Apparatus and methods for the stitch zone calculation of a generated projection of a spherical image. In one embodiment, a computing device is disclosed which includes logic configured to: obtain a plurality of images; map the plurality of images onto a spherical image; re-orient the spherical image in accordance with a desired stitch line and a desired projection for the desired stitch line; and map the spherical image to the desired projection having the desired stitch line. In a variant, the desired stitch line is mapped onto an optimal stitch zone, the optimal stitch zone characterized as a set of points that defines a single line on the desired projection in which the set of points along the desired projection lie closest to the spherical image in a mean square sense.
1. A device configured to generate an image projection, the device comprising:
a data interface;
a processing apparatus in data communication with the data interface; and
a non-transitory computer-readable storage apparatus in data communication with the processing apparatus, the non-transitory computer-readable storage apparatus comprising a plurality of instructions configured to, when executed by the processing apparatus, cause the device to:
identify a stitch line associated with a meridian area of one or more at least partly spherical images obtained by the device via the data interface;
modify, based on the identified stitch line, an orientation of the one or more at least partly spherical images; and
generate, based at least on the modified one or more at least partly spherical images, a cubic projection having the identified stitch line.
2. The device of claim 1 , wherein the plurality of instructions are further configured to, when executed by the processing apparatus, cause the device to:
obtain image data via one or more image-capture apparatus; and
map at least a portion of the obtained image data onto the one or more at least partly spherical images.
3. The device of claim 2 , wherein the obtained image data comprises one or more hyper-hemispherical images each associated with a field of view greater than 180°.
4. The device of claim 3 , wherein:
the one or more image-capture apparatus comprise at least a pair of fisheye cameras; and
capture of the one or more hyper-hemispherical images comprises identification of one or more overlapping portions proximate one or more boundaries of the one or more hyper-hemispherical images.
5. The device of claim 2 , wherein:
the map at least a portion of the obtained image data onto the one or more at least partly spherical images comprises a mapping of at least a portion of pixels associated with the at least partly spherical images onto Cartesian coordinates or spherical coordinates; and
generation of the cubic projection comprises a mapping of the modified one or more at least partly spherical images to the cubic projection.
6. The device of claim 1 , wherein the identification of the stitch line comprises a determination of an optimal stitch area, the optimal stitch area configured to (i) meet at least one mathematical criterion or (ii) reduce a level of distortion for an object of interest within the at least partly spherical images.
7. The device of claim 1 , wherein the generated cubic projection comprises six faces in a 4×3 arrangement, each of three contiguous faces of the six faces containing a portion of the identified stitch line, a face non-contiguous to the three contiguous faces containing a portion of the identified stitch line.
8. The device of claim 1 , wherein the generated cubic projection comprises six faces in a 3×2 arrangement, each of two contiguous faces of the six faces containing a portion of the identified stitch line, each of another two contiguous faces of the six faces containing a portion of the identified stitch line.