makeZimage: Generate a ZenithImage.

In GastonMauroDiaz/caiman: Canopy Image Analysis

Description

Helper function to generate a ZenithImage. Compute zenith angle for each pixel needed to represent a circular hemispherical image with 180 degrees field of view. For definition of zenith angle see details of lensPolyCoef.

Usage

makeZimage(x, y)

## S4 method for signature 'RelativeRadiusImage,LensPolyCoef'
makeZimage(x, y)

## S4 method for signature 'numeric,LensPolyCoef'
makeZimage(x, y)

Arguments

x	numeric or RelativeRadiusImage.
y	LensPolyCoef.

Details

If the x argument of a call to makeZimage is numeric, the function internally calls to makeRimage.

Value

ZenithImage.

Methods (by class)

• x = RelativeRadiusImage,y = LensPolyCoef: In certains processing chain, maybe it could help to decrease processing time. For example, in processing photos with same resolution but taken with different lens.

• x = numeric,y = LensPolyCoef: It is the most frequent use. You only need to provide the diameter in pixels of the circle that has data in the circular hemispherical photographs you want to process.

See Also

RelativeRadiusImage.

Examples

lens <- lensPolyCoef()
z <- makeZimage(480, lens)
plot(z)
z

GastonMauroDiaz/caiman documentation built on Jan. 22, 2022, 4:43 a.m.