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Table 1 Multiple criteria evaluation/semi-quantitative scoring decision matrix

From: An evaluation of inexpensive methods for root image acquisition when using rhizotrons

Method Smartphone application Flatbed scanner Handheld scanner Time-lapse camera Transparent sheet
Image quality ***
High
***
High
***
High
*
Low
Deformation *** *** *** ** **
 Length No No No No No
 Diameter No No No Yes Yes
Time taken **** ** *** **** *
 For 1 rhizotron 40 s 12 min 1 min  0 s 12 min
 For 8 rhizotrons 7 min 96 min 16 min   95 min
Cost **
Phone100–700€ Apps free
**
150 €
**
80 €
*
190 €/rhizotron
****
Usage in field ****
Easy/1 person
**
Difficult/2 persons
***
Easy/1 person
***
Autonomous
*
Difficult/1 person
Accessories ***
No
*
Yes/battery and PC
***
No
***
No
***
No
Time between visits **
2–4 weeks
**
2–4 weeks
**
2–4 weeks
***
4–5 months
**
2–4 weeks
Time to treat images before analysis ***
0 s
*
3.30 min/image
*
4 min/image
*
3 min/image
***
0 s
  1. **** Optimal, *** good, ** fair, * poor, – not applicable