![]() ![]() Convert both fisheyes into the equirectangular space.Determine resolution of the images (what camera mode they were shot in).Take matching front and back fisheye images on the Fusion.In summarising the last four weeks of content, the process to convert dual GoPro Fusion fisheye photos into a single equirectangular image is as follows There are many more open-source blending algorithms available too. We used alpha blending in our MAX2Sphere script. Remember GoPro mentioned their D.WARP algorithm in the first post of this series? This algorithm identifies duplicate pixels and normalises the colour between the front and back images (due to lighting differences on either side of the camera). Note: the actual blending zone is larger at the top and the bottom of the image, as shown in the world mapped in a fisheye with a 220 degree FOV in last weeks post – but these areas are cut off when image is mapped into equirectangular space.Ī bit of blending is required to map/smooth the duplicate pixels in the blend zones. Generally FOV angles of at least 190 degrees or more are required for a satisfactory blend zone. The HFOV for the back lens is the same (190), so there will be a blend zone of 5 degrees either side, where the images should overlap nicely. The back image, once mapped into equirectangular space, is split into two the left side goes left, the right side right. The HFOV on the Fusion is roughly 190 degrees, so a blend zone of 5 degrees on the left and right side of the front image exists (180 + 5 + 5). Once both fisheye images are mapped into equirectangular space, as shown last week, stitching of both images can happen to create a single equirectangular image. It was clear we needed to understand the field of view of the lenses on the Fusion in order for stitching to work correctly (because the FOV will determine the blend zone). I finished last weeks post talking about field of view. Taking what we’ve learned over the last 3 weeks and putting it all together to create a script to convert 2 GoPro Fusion fisheye to one equirectangular image.
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