| zenith_image {rcaiman} | R Documentation |
Build Zenith image
Description
Build a single layer-image with zenith angle values, assuming upwards-looking hemispherical photography with the optical axis vertically aligned.
Usage
zenith_image(diameter, lens_coef)
Arguments
diameter |
Numeric vector of length one. Diameter in pixels expressed as an even integer. The latter is to simplify calculations by having the zenith point located between pixels. Snapping the zenith point between pixels does not affect accuracy because half-pixel is less than the uncertainty in localizing the circle within the picture. |
lens_coef |
Numeric vector. Polynomial coefficients of the lens
projection function. See |
Value
An object of class SpatRaster of zenith angles in degrees, showing a complete hemispherical view with the zenith on the center.
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(),
fisheye_to_pano(),
lens(),
test_lens_coef()
Examples
z <- zenith_image(600, lens("Nikon_FCE9"))
plot(z)