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





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Software Features

WinDENDRO Regular
WinDENDRO Density

Low entry version allowing users to measure annual tree-ring at low cost.


Includes all the features of WinDENDRO Basic and does conventional analysis


Includes all the features of WinDENDRO Regular and allows the users to do extended analysis

Paths Features
Number of automatic ring detection methods
All versions have the intensity differences method. The Reg and Density versions have an alternative method called Teach&Show method which is sometimes better for deciduous (but can also work with conifers). Two methods give more options for low contrasted rings.
Paths per image (max)
The mini version only works with one path at a time. The Basic can work with 1 to 4
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 between segments
Brother paths  
Possibility to add paths to existing ones sharing the same origin (such as 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 areas such as cracks due to wood drying from the ring widths measurements.
Batch Reanalysis  
Possibility to reanalyse images previously analysed under different analysis parameters. To change the calibration or the earlywood definition for example.
Earlywood, latewood width measurement   *
* The density version will 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 module    
This module is optional and can be added to any version of WinDENDRO. It adds the following:
•: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 will produce 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    
From x-ray films or images from digital film less x-ray systems. Measurements per ring include; minimum density, maximum density, average ring density, average earlywood density, average latewood density and ring orientation.
Image sources
Analyse tiff, jpeg or bmp files
Tiff uncompressed is recommended for precision.
Acquire images from TWAIN compatible scanners and cameras
The Mini version can only open tiff, bmp and jpeg files.
Calibration for images which come from a camera
Calibration of images from a camera can be done with a single mouse click when Regent’s new calibration targets are included in the image.
Image processing and analysis
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 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). If the color channel is changed while an analysis is displayed, the paths intensity profile and density values for each ring(min, max, average) are recalculated automatically.
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 analysis (on x-ray films or wood). Any modifications done to the image are permanent and are saved with it (if you save the image after edition).
Image Temporary Markers  
You can draw temporary markers over the image (to help you keep track of rings along a disk to find missing ones for example). Markers appearance (thickness, color) can be changed after they have been created and can have an identification name.
Background light variations removal    
Mostly used with camera images.
Ring-width graphic, cross-dating, skeleton plots, detrending  
Refer to the Graphic section
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.
Possibility to save only the last few rings of a path  
For stem analysis mostly. To study growth of only some years of interests.
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.
WinCELL Regular included  
A program for wood cell anatomical analysis (lumen area, length, cell length, earlywood width...)

Specifications subject to modifications.