Comparative resolution of 360 video capture devices
|LadyBug-3||5400||2 mm||6 mm||23 mm||16 fps at this resolution.|
|LadyBug-5||8000||1.5 mm||4 mm||16 mm||10 fps at this resolution.|
|H3Pro7HD (Kolor)||8000||1.5 mm||4 mm||16 mm||7 GoPro cameras mounted in portrait.|
|H3Pro7 (Kolor)||6000||2 mm||5 mm||21 mm||7 GoPro cameras.|
|Lucy (Kogeto)||2000||6 mm||16 mm||63 mm||Example of camera based upon 1920 video.|
|Joey (Kogeto)||4000||3 mm||8 mm||31 mm||Not yet available at time of writing.|
|Bublcam||2500||5 mm||13mm||50||Not yet available at time of writing.|
4 x 720p camera at 30fps.
|Bublcam||3600||3.5 mm||8 mm||35 mm||Not yet available at time of writing.|
4 x 1920p camera at 15fps.
|Centrcam||6900||1.8 mm||4.5 mm||18 mm||Not yet available at time of writing.|
In the above it has been assumed that if a device can capture N pixels horizontally, then those pixels are "pure", this is never the case. Further degradation can occur and some sources are listed below.
Many of the camera solution do not result in a uniform resolution across the cylindrical or spherical projection. This is particularly true of single camera solutions based upon conical mirrors.
In the case of many commodity devices, while they may contain the same sensor as more expensive versions, there can be a poorer quality lens in front of the sensor. This generally means that pixels are no longer independent (they receive light over a wider region of the world) and generally an increase in chromatic error. This is particularly true of many of the mobile phone based options.
Different sensors have different levels of random noise, especially in low light.
Digital video capture is often limited by the bandwidth to the recording device. To maintain a recording resolution and frame rate the video is generally compressed with corresponding artefacts. The slower the recording device, the more compression and video degradation that occurs. Particularly so with SD storage medium in the GoPro, and others.
While the only scalable means of increasing the resolution is to use multiple cameras, this introduces potential resolution degradation across the overlap and blending zone. While there are multiple camera configurations, that with the use of mirrors, can create a single projection point, the majority have an offset projection point. For very fundamental reasons this means that a perfect stitch/blend across all depths is impossible.