Generate VR Lens Map Importer

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‌Generate VR Lens Map Importer

This importer in the 360 VR area reads a small file of data from a lens manufacturer, and produces a lens distortion map that converts images to 360 VR format. The initial example for this is Entaniya super-wide-angle lenses (220, 250, and 280 degrees), which cannot be calibrated with typical lens grids due to the high field of view. (The random-dot method can be used, see the Camera Calibration manual.)

In addition to the possibility of creating your own 360VR cameras with a back-to- back pair of cameras and lenses (sometimes with a drone in between), these maps can also be used to get 3D solves of wide-angle still images to make quicker on-set surveys for regular non-360VR projects.

The input file consists of multiple lines, each an incoming ray angle and the resulting image-plane radius. For example, the 250 degree 3mm lens data starts out

# Entaniya 250 deg 3.0mm --- comment line

0	0
5	0.2648
10	0.5295
15	0.7939
20	1.0579
25	1.3214
...

This data is simply read from the Entaniya datasheet.

The importer requires a fair number of inputs that describe the camera that the lens is mounted on, such as the sensor size and resolution, which can generally be obtained from the lens manufacturer. It does require the lens center position, which is unique to each specific camera (even otherwise identical units). You can measure that with the Lens Centering via Vignetting procedure, for example.

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