Development of color guides to evaluate the maturity of cacao clones by digital image processing

García-Muñoz, Maria Cristina; Tarazona-Díaz, Martha Patricia; Meneses-Marentes, Nixon Andres; González-Sarmiento, Gabriela; Pineda-Guerrero, Ana Sofía; Gómez-Uribe, Germán Eduardo

doi:10.1590/1983-40632021v5169621

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Scientific Note • Pesq. Agropec. Trop. 51 • 2021 • https://doi.org/10.1590/1983-40632021v5169621 copy

Development of color guides to evaluate the maturity of cacao clones by digital image processing

Desenvolvimento de guias de cores para avaliar a maturação de clones de cacau por meio de processamento digital de imagens

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Raw material homogeneity is one of the most requested characteristics in any production industry, and the cacao industry is no exception. However, there are many factors that affect the final quality of fruits, among them the variety and maturity stage. The present study aimed to create color tables for evaluating the maturity index of the ICS06, CCN51 and EET8 cacao clones, using digital image processing, in order to contribute for the quality and final homogeneity of the fruits and their by-products.

KEYWORDS:
Theobroma cacao L; maturation index; cacao quality

Tone	Criteria
Tone	a* value	b* value
Green	-31 ≤ a* ≤-14	-
Green	-14 < a* ≤-9	-b < 50
Yellow	-14 < a* ≤-9	-b ≥ 50
Yellow	9 < a* ≤ 22	-
Orange	22 < a* ≤ 31	b ≥ 30
Orange	31 < a* ≤ 48	b ≥ 38
Red	48 < a* ≤ 66	-
Purple	22 < a* ≤ 31	b < 30
Purple	31 < a* ≤ 48	b < 38

Clone	Maturity stage	L^* * , a* and b* coordinates and the maturity index are represented by the mean and its standard deviation. Equal letters in the same row mean that there is no significant difference with respect to the maturity stage.	a^* * , a* and b* coordinates and the maturity index are represented by the mean and its standard deviation. Equal letters in the same row mean that there is no significant difference with respect to the maturity stage.	b^* * , a* and b* coordinates and the maturity index are represented by the mean and its standard deviation. Equal letters in the same row mean that there is no significant difference with respect to the maturity stage.	Main tone	SS/TA
CCN51	1	49.70 ± 13.69^a	27.15 ± 29.87^a	22.78 ± 12.04^c		13.51 ± 1.61^yz
	2	44.93 ± 16.53^a	38.96 ± 22.26^a	31.00 ± 17.06^bc		11.70 ± 1.41^z
	3	46.15 ± 15.60^a	38.56 ± 25.61^a	30.56 ± 18.77^bc		13.63 ± 1.10^yz
	4	48.04 ± 17.19^a	33.37 ± 28.98^a	36.89 ± 18.84^ab		15.28 ± 1.93^y
	5	50.63 ± 16.20^a	37.44 ± 22.67^a	45.07 ± 19.12^a		14.90 ± 1.56^y
	6	-	-	-	-	-
ICS60	1	38.59 ± 11.02^b	-18.93 ± 3.84^bc	29.78 ± 9.28^c		11.32 ± 1.67^z
	2	54.63 ± 16.07^a	-22.00 ± 4.23^c	45.96 ± 15.95^b		13.52 ± 0.82^yz
	3	58.41 ± 14.42^a	-18.44 ± 6.14^bc	49.85 ± 14.39^ab		12.69 ± 1.27^yz
	4	58.11 ± 16.34^a	-13.41 ± 14.74^bc	50.15 ± 21.31^ab		14.73 ± 2.75^yz
	5	65.19 ± 12.87^a	-4.81 ± 16.76^b	60.67 ± 13.90^a		16.80 ± 3.33^y
	6	62.63 ± 12.38^a	18.19 ± 15.21^a	59.59 ± 10.01^a		14.08 ± 3.44^yz
EET8	1	43.44 ± 17.27^bc	23.56 ± 24.86^b	11.89 ± 7.45^d		8.98 ± 1.36^z
	2	42.70 ± 15.73^bc	25.67 ± 21.67^b	18.44 ± 11.19^cd		10.62 ± 2.30^yz
	3	41.26 ± 10.10^c	41.11 ± 13.53^a	26.33 ± 14.22^c		11.32 ± 2.26^yz
	4	52.37 ± 13.25^ab	31.22 ± 23.18^ab	46.41 ± 14.25^ab		13.77 ± 3.25^y
	5	48.00 ± 10.32^b	42.74 ± 15.67^a	44.52 ± 10.74^b		14.18 ± 3.10^y
	6	57.59 ± 8.94^a	30.33 ± 10.80^b	56.78 ± 9.32^a		10.84 ± 1.47^yz

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