Re: About conversion from equirectangular to cubic faces (rectiliniar)
- Hi Jim thanks for reply, yes you're absolutelly right. Maybe even
shoots pointed to the corners of the cube, however that was given as
an example, what I intend to use conevrsion formulas to adjust the
cubic faces at the edge to make the seam less visible/distracting,
but with the cubic faces generated direct from PTgui/Hugin of course
after careful optimise/align with correct lens parametter, so on,
using a precise pano head, in order to jump over one interpolation,
as I said.
--- In PanoToolsNG@yahoogroups.com, Jim Watters <jwatters@...> wrote:
> There is always some error when aligning images to create a
> blending these images together the errors are hidden. The methods
> have to of blending two images together will put those seams at
> different places if the two images are cropped in different ways
> the overlap does not change. If the blending tool is not told that
> seams at the left and right of a equirectangular should blend when
> panorama is displayed in a viewer that seam will be visible and
> If you just crop out the 90x90 image from the 6 input images to
> cube there will be very visible seams at every edge. There are 12
> edges. If you crop the images to leave a little overlap (95X95)
> the viewer do the blending then you are removing overlap that might
> prevent partial ghost from showing up. But you are still running
> images through the optimizer and extracting the image to be used.
> just allowing the view to possibly show blending errors at the
> The examples you are displaying with DevalVR without stitching
> If you still want to blend the images together, but you want to
> first generating a single full spherical image, then the best thing
> to make sure that each edge of the cube is covered by a single
> To mostly do this. Instead of pointing the camera to each side of
> cube. For the 4 around point to to the edges. This will hide some
> the seams but not all of them. In the long run it will likely take
> longer to longer to generate. the stitcher and blender will be
> the same image multiple times.
> Having the entire sphere in a single image for post processing is
> easier. The equirectangular image works well for this.
> Jim Watters
> dorindxn wrote:
> > Hi Erik, now is my time to not understand you both times because
> > my English I'm sure :(
> > Again is about stitching directly to cubic faces, like, for
> > one shoots 6 images with fisheye each shoot in direction
> > with each cube face then remmap and crop those as rectilinear
> > then to blend, mean to adjust the near border region of each to
> > the seam invisible at displaying.
> > Dorin
> > --- "Erik Krause" wrote:
> >> ....
> >> However, to blend cubefaces might be a bit easier, since there
> >> less anisotropic distortion. In a cube you have 12 joints
> >> cubefaces.
> Jim Watters
> jwatters @ photocreations . ca