efourier_inv

Performs an inverse elliptical Fourier transformation to construct a shape,
given a list with Fourier coefficients computed with <code>efourier()</code>.

Tools for single or batch image manipulation and analysis as
described by Olivoto (2022) <doi:10.1111/2041-210X.13803> that can be
used to quantify plant leaf area, assess disease severity, count
objects, obtain shape measures, object landmarks, and compute
Elliptical Fourier Analysis of the object outline, as described by
Claude (2008) <doi:10.1007/978-0-387-77789-4>. Additionally, the
package includes tools for analyzing grids, which enables high
throughput field phenotyping using RGB imagery captured by unmanned
aerial vehicles.

Tiago Olivoto

pliman

Tools for Plant Image Analysis

efourier_inv function

<dl><dt>x</dt>
<dd>An object of class <code>efourier</code> or <code>efourier_lst</code> computed with
<code>efourier()</code>.</dd>
<dt>nharm</dt>
<dd>An integer indicating the number of harmonics to use. If not
specified the number of harmonics used in <code>x</code> is used.</dd>
<dt>a0, c0</dt>
<dd>the estimates of the coordinates of the centroid of the
configuration. If <code>NULL</code> (default), the generated coordinates will be
centered on the position of the original shape given by <code>efourier()</code>.</dd>
<dt>npoints</dt>
<dd>The number of interpolated points on the constructed outline.
Defaults to 500.</dd></dl>

Arguments

Inverse Elliptical Fourier Analysis — efourier_inv

<dl>

<dt>x</dt>
<dd>An object of class <code>efourier</code> or <code>efourier_lst</code> computed with
<code>efourier()</code>.</dd>


<dt>nharm</dt>
<dd>An integer indicating the number of harmonics to use. If not
specified the number of harmonics used in <code>x</code> is used.</dd>


<dt>a0, c0</dt>
<dd>the estimates of the coordinates of the centroid of the
configuration. If <code>NULL</code> (default), the generated coordinates will be
centered on the position of the original shape given by <code>efourier()</code>.</dd>


<dt>npoints</dt>
<dd>The number of interpolated points on the constructed outline.
Defaults to 500.</dd>

</dl>

efourier_inv: Inverse Elliptical Fourier Analysis

Description

Usage

Arguments

Details

References

Examples