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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