search

Planteome / CO_343-yam-traits

Yam trait ontology
https://cropontology.org/term/CO_343:ROOT
1 stars 1 forks source link

Create: Purpelness of the tuber flesh color #32

Open dcornet opened 2 years ago

dcornet commented 2 years ago

Submitter
Name CORNET
Program Cirad

Creation Request
Trait Name Purpelness of the tuber flesh color
Definition Measurement of the surface purpelness of the yam tuber flesh
Trait Class Quality
Measurement Method Tuber flesh purpleness computation from standardized image Lab values. Compute the index based on the flesh surface color of tuber longitudinal section using image analysis with a color correction based on a custom color chart. Considering a stable light environement (i.e. similar L), the Hue is used to discriminate purple yam (low value) and white or creamy yam (high value). Hue=atan(b/a)
Measurement Type Unit
Measurement Unit degrees
aafolabi commented 2 years ago

@dcornet What device are you using for this measurement?

dcornet commented 2 years ago

@aafolabi We can use any personal of professional camera as long as it is programmed to provide sRGB values (which are then turned into CIE Lab values allowing the computation of Hue). An SOP was written to describe every steps of this procedure: https://rtbfoods.cirad.fr/deliverables/scientific-cross-cutting-activities/laboratory-reports-standard-operating-procedures/2019