fisheye_to_pano {rcaiman}

Fisheye to panoramic

Description

Fisheye to panoramic (cylindrical projection)

Usage

fisheye_to_pano(r, z, a, fun = mean, angle_width = 1)

Arguments

r

SpatRaster. A fish-eye image.

z

SpatRaster built with zenith_image().

a

SpatRaster built with azimuth_image().

fun

A function that takes a vector as input and returns a one-length numeric or logical vector as output (e.g. mean).

angle_width

Numeric vector of length one. It should be ⁠30, 15, 10, 7.5, 6, 5, 3.75, 3, 2.5, 1.875, 1⁠ or 0.5 degrees. This constrain is rooted in the requirement of a value able to divide both the 0 to 360 and 0 to 90 ranges into a whole number of segments.

Details

An early version of this function was used in Díaz et al. (2021).

References

Díaz GM, Negri PA, Lencinas JD (2021). “Toward making canopy hemispherical photography independent of illumination conditions: A deep-learning-based approach.” Agricultural and Forest Meteorology, 296, 108234. doi:10.1016/j.agrformet.2020.108234.

See Also

Other Lens Functions: azimuth_image(), calc_diameter(), calc_relative_radius(), calc_zenith_colrow(), calibrate_lens(), crosscalibrate_lens(), expand_noncircular(), extract_radiometry(), fisheye_to_equidistant(), lens(), test_lens_coef(), zenith_image()

Examples

## Not run: 
caim <- read_caim()
z <- zenith_image(ncol(caim), lens())
a <- azimuth_image(z)
pano <- fisheye_to_pano(caim, z, a)
plotRGB(pano %>% normalize() %>% multiply_by(255))

## End(Not run)