Comparing a Mercator projection with a Cube Face projection

One of my favorite panoramas I shot recently is the atrium of the Bavarian Ministry of Justice. Why? Because I managed to capture the almost perfect symmetry in the room. See for yourself here or here. I also reprojected the full spherical panorama to the Mercator view you see in the following image.

Atrium of the Bavarian Ministry of Justice - Mercator projection

Atrium of the Bavarian Ministry of Justice – Mercator projection

What I don’t like about this panorama are the curved lines. It came to my mind that a rectilinear reprojection of the image would result in straight lines. However it is also not possible to reproject the full 360° field of view into one single rectilinear image. But it is possible to split the full 360° into 4×90°. The following image is the result of this technique.

Atrium of the Bavarian Ministry of Justice - Cube Face projection

Atrium of the Bavarian Ministry of Justice – Cube Face projection

All the straight lines in the panorama are also straight in the real building. The problem is now you get some discontinuities at border between the four cube faces. This is not a real problem in this panorama as the floor tiles just look fine wih the additional discontinuities.

The following image shows the four cube faces reprojected back onto the equirectangular image. You can see here clearly why the floor tiles are not curved in the final Cube Face Panorama. You can also see that the cube faces are not really cube faces, because I moved the individual cubes faces towards the zenith to see less of the floor and more of the ceiling.

Atrium of the Bavarian Ministry of Justice - Cube Face (Making Of)

Atrium of the Bavarian Ministry of Justice – Cube Face (Making Of)

The following panorama shows the extracted cube faces in an interactive view:

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Comparing images from Opernplatz, Frankfurt am Main (2004 and 2014)

The upcoming World Wide Panorama (WWP) event is entitled ‘decade’.

In the time frame of a decade even a city can change it’s appearance. So I searched for panoramic images which I shot in 2004 and which were shot at a place which changed over the last ten years. The best example was a image of the Opernplatz, which I took back in 2004 as a cylindrical panorama. And the view of the Opernplatz (which translates to ‘the square of the opera’) indeed changed a lot in the last ten years.

So I went back and stood at the same spot where I stood a decade ago. First I took a spherical panorama with my double monopod construction. Afterwards I did a remake of the original cylindrical panorama. The following image shows the two cylindrical panoramas in a single composite.

Opernplatz (Frankfurt am Main) 2004 and 2014

Opernplatz (Frankfurt am Main) 2004 and 2014

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The original panorama from 2004 is also available on the blog.

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Sculpture Umschreibung – Inside

Originally this panorama was my submission to the World Wide Panaorama event ‘Decade’. I took it with a monopod mounted on a tripod and took four images with the Walimex 8mm fishe eye lens mounted on the Sony ILCE-7.

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Camera Maker: SONY
Camera Model: ILCE-7
Exposure Time (sec): 2.5
F-Number: 7.1
Focal Length (mm): 8
Lens: Walimex 8mm/2.8
ISO: 100

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Barnafoss Bridge Downstream (Making Of)

Recently I got a question about this panorama I published on Maps Views:

  • Hi Markus, nice shot, but what happen with the focus, the right of the river is blurred?

Here I try to explain the problem. In short: I’ve just been too lazy to make an “up” shot (zenith). It is completely missing. The stitching result has not been retouched at all.

When making a horizontal pole shot the “zenith” and “nadir” end up near the equator of the photo sphere. You can see this clearly in the image below, where the red image borders cross. “Zenith” and “nadir” in this case means the direction where the pole is pointing!

Making Of Barnafoss Horizontal Pole Shot (1)

Making Of Barnafoss Horizontal Pole Shot (1)

When removing all images but one, this looks like the image below. You can clearly see, that the worst part of the fish eye lens ends up in an area of interest. In this case the right side of the river bank.

Making Of Barnafoss Horizontal Pole Shot (2)

Making Of Barnafoss Horizontal Pole Shot (2)

This image shows the original fish eye shot. You see the bad part of the lens ending up on the right hand side of the river bank.

Making Of Barnafoss Horizontal Pole Shot (3)

Making Of Barnafoss Horizontal Pole Shot (3)

The solution to this problem is easy: You just need to take an “up” shot. However in this case “up” is again in the direction of the pole! Unfortunately for minimizing the parallax problems I would have needed a different mounting option for my camera.

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Skyline of Frankfurt am Main on a sunny day in March 2014

This panorama was stitched from six images in landscape orientation. The resulting panorama is 10800 x 5585 pixels. Despite the fact that it was taken through a tinted window, I’m quite pleased with the final result.

Skyline of Frankfurt am Main (March 2014)

Skyline of Frankfurt am Main (March 2014)

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Camera Maker: SONY
Camera Model: NEX-7
Exposure Time (sec): 1/200
F-Number: 7.1
Focal Length (mm): 16
Lens: Sony PZ 16-50mm
ISO: 100

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Skyline of Frankfurt am Main at dusk (2014)

This image shows a panorama which was stitched from eight images in portrait orientation. Due to the high dynamic range of the sensor I only used one exposure and brought back the shadows with Lightroom. The size of the resulting image is 19200 x 6000 pixel.

Skyline of Frankfurt am Main at dusk (2014)

Skyline of Frankfurt am Main at dusk (2014)

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Camera Maker: SONY
Camera Model: ILCE-7
Exposure Time (sec): 4
F-Number: 7.1
Focal Length (mm): 55
Lens: Sony 55mm/1.8 (FE)
ISO: 100

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