WinDENDRO Step by step, tree-ring measurement, stem and wood density analysis
Image Analysis for Plant Science
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Regent Instruments Inc. since 1991

 

 

WinDENDRO

 


For sales informations,
contact us by email

sales@regentinstruments.com

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Software Features

 
WinDENDRO Basic
 
WinDENDRO Regular
 
WinDENDRO Density
 
 

Low cost entry version to measure annual tree-rings.

 

Includes all features of the Basic version plus extra features and analyses.

 

Includes all features of Regular version plus extended, Density and Blue Reflectance analyses.

 
Paths Features
Description
Basic
Reg
Dens
Number of automatic ring detection methods
1
4
4
All versions have the intensity differences method. The Reg and Density versions have 3 alternative methods some which are sometimes better for deciduous (but can also work with conifers). These extra methods give more options for low contrasted rings, which are more difficult to analyse.
Paths per image (max)
4
256
256
 
Vertical or horizontal paths
Paths in the same direction as the image edges.
Paths in any direction  
Paths in directions other than horizontal and vertical.
Multi-segments paths  
Paths that have more than one segment and can change direction at connectiing points.
Brother paths  
Possibility to add paths to existing ones sharing the same origin (such as a disk pith).
Tangent to ring boundary
Ring widths are more precise when they are oriented to follow the ring boundary direction.
Skip gaps (cracks, void)
To exclude from the ring widths measurements areas such as cracks due to wood drying.
Batch Reanalysis  
To reanalyse without operator supervision, images previously analysed under different analysis parameters or settings. E.g. change the calibration or the earlywood definition.
Measurements
Description
Basic
Reg
Dens
Earlywood, latewood width measurements   *
*
* The density version produce more precise earlywood width measurement when density analysis is turned on (even if no light calibration is done). This version is strongly recommended for this measurement.
Sapwood width
Must be indicated manually by the operator.
Ring features  
For each ring, you can set up to five features or observations that you define (frost ring, wide, missing...) plus add textual comments. Features are displayed in the image, the ring-widths graphic and are saved with the analysis data.
Log/Area function    
•Compression (reaction) wood and voids (cracks) areas measurement. This is done manually by tracing them in the image.
•Disk area, shape (form coefficient), perimeter, average radius, ring density per inch or cm in function of distance to pith. This is done semi-automatically.
Light reflection analysis  
*
*
Export the path intensity profile to text files (on a pixel basis). The density version produces more precise measurements when density analysis is turned on (even if no light calibration is done). This version is strongly recommended for this measurement.
Density Analysis & Blue Refllectance Method    

From images of x-ray films or digital filmless x-ray systems true density can be measred. Measurements per ring include; minimum, maximum, average ring density, average earlywood and average latewood density. Blue reflectance is a surrogate to density measurement. It measures blue reflected light from the wood sample and can be correlated to density (if desired). A calibration on a blue calibrated reflectance target is required (target is available as an option).

Image sources
Description
Basic
Reg
Dens
Analyse tiff, jpeg, jpeg2000, PNG or bmp files
Uncompressed formats (tiff, png) are recommended for greater precision.
Acquire images from TWAIN compatible scanners and cameras
 
Calibration for images which come from a camera
Calibration of images from a camera can be done on any scale (ruler) in a few mouse clicks or with a single mouse click when Regent’s targets are used.
Image processing and analysis
Description
Basic
Reg
Dens
9 to 16 bits per pixel grey levels    
Grey levels images with more than 8 bits per pixels of information (typically 10, 12 or 16 bits/pixel) produce greater precision Density and Blue Reflectance analyses.
Color channel selection    
Color images can be visualized and analysed on one of its three color channels (Red, Green, or Blue) or using the three of them (a regular color image).
Image edition  
You can edit the image (modify its content) with any color present in it (by picking it up interactively) or by defining your own colors. This allows to remove defects that prevent ring analysis from being done accurately. It can also be used to remove artefacts for Density or Blue Reflectance analysis.
Image Temporary Markers  
You can draw temporary markers over the image (to help keep track of rings along a disk, to find missing ones for example). Markers appearance (thickness, color) can be changed and can have an identification name.
Background light variations removal    
Mostly used with camera images.
Graphic
Description
Basic
Reg
Dens
Ring-width graphic, cross-dating, skeleton plots, detrending  
Refer to the Graphic section
Miscellaneous
Description
Basic
Reg
Dens
Save data in ascending order
From pith to bark or bark to pith.
Save data in descending order  
From pith to bark or bark to pith.
Customisable sample identification  
Choose the meaning and type of some variables used to identify a sample before its analysis. This information is saved with the data.
Multiple documents  
Can work on more than one image at a time (up to 16). Each document has its own image (which can have multiple paths), graphic and data file.

Specifications subject to modifications.