cm2px

px2cm

<code>cm2px</code> - Converts centimeters to pixels.
<code>px2cm</code> - Converts pixels to centimeters.

Minirhizotrons are widely used to observe and explore roots and
their growth. This package provides the means to stitch images and
divide them into depth layers.
Please note that this R package was developed alongside the following
manuscript:
Stitching root scans and extracting depth layer information -- a workflow
and practical examples, S. Kersting, L. Knüver, and M. Fischer.
The manuscript is currently in preparation and should be citet as soon as
it is available.
This project was supported by the project ArtIGROW, which is a part of the
WIR!-Alliance ArtIFARM –  Artificial Intelligence in Farming funded by the
German Federal Ministry of Research, Technology and Space (No. 03WIR4805).

Sophie Kersting

RootscanR

Stitching and Analyzing Root Scans

Linda Knüver

Mareike Fischer

cm2px function

<dl><dt>cm</dt>
<dd>Numeric value or numeric vector (centimeters) to be converted
to pixels.</dd>
<dt>ppcm</dt>
<dd>Numeric value or numeric vector (default NULL) of the same length
as <code>cm</code> or <code>px</code> specifying how many pixels there are per
centimeter.
If <code>ppcm</code> is not NULL, <code>ppi</code> is ignored. 
Examples: 300 ppi (printing) is 118 ppcm, 150 ppi is 59 ppcm,
72 ppi (screens) is 28 ppcm.</dd>
<dt>ppi</dt>
<dd>Numeric value or numeric vector (default NULL) of the same length
as <code>cm</code> or <code>px</code> specifying how many pixels there are per inch.
Set <code>ppcm</code> to NULL to use <code>ppi</code>. 
Examples: 300 ppi (printing) is 118 ppcm, 150 ppi is 59 ppcm,
72 ppi (screens) is 28 ppcm.</dd>
<dt>px</dt>
<dd>Numeric value or numeric vector (pixels) to be converted to
centimeters.</dd></dl>

Arguments

Functions for converting pixels and centimeters — cm2px

<dl>

<dt>cm</dt>
<dd>Numeric value or numeric vector (centimeters) to be converted
to pixels.</dd>


<dt>ppcm</dt>
<dd>Numeric value or numeric vector (default NULL) of the same length
as <code>cm</code> or <code>px</code> specifying how many pixels there are per
centimeter.
If <code>ppcm</code> is not NULL, <code>ppi</code> is ignored. 
Examples: 300 ppi (printing) is 118 ppcm, 150 ppi is 59 ppcm,
72 ppi (screens) is 28 ppcm.</dd>


<dt>ppi</dt>
<dd>Numeric value or numeric vector (default NULL) of the same length
as <code>cm</code> or <code>px</code> specifying how many pixels there are per inch.
Set <code>ppcm</code> to NULL to use <code>ppi</code>. 
Examples: 300 ppi (printing) is 118 ppcm, 150 ppi is 59 ppcm,
72 ppi (screens) is 28 ppcm.</dd>


<dt>px</dt>
<dd>Numeric value or numeric vector (pixels) to be converted to
centimeters.</dd>

</dl>

cm2px: Functions for converting pixels and centimeters

Description

Usage

Value

Arguments

Examples