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South African
Wine Lab Association:

An Analysis of Seed Colour during Ripening of Cabernet Sauvignon Grapes

C. Fredes1*, M. Mora2, M. Carrasco-Benavides1

This case study examines seed colour during ripening using an exhaustive colorimetric analysis. The aim
was to associate the chemical ripening with the seed colour in order to estimate the ripening stages of
Cabernet Sauvignon grapes. Cluster samples, obtained from a vertical shoot-positioned vineyard in central
Chile, were monitored for their technological and phenolic maturity, as well as for the colorimetric and
chemical characteristics of the seeds. The colours of the scanned seed images were determined by human
as well as by computer vision. In the first case, an expert assigned a colour to each seed part. In the second
case, a computer program estimated the colours of the scanned seed images. An exhaustive analysis of seed
colour was proposed, instead of a general observation of seed browning. The seed colour presented a wide
range of colours, from moss green to dark brown, depending on the maturity and the face observed. The
ripening stages identified, along with the chemical and colorimetric information gathered, were under ripe
seed (brown with green traces), ripe seed (dark brown with green traces) and overripe seed (dark brown
without any green traces). A new way to quantify seed colour is shown in this paper.

grapevines, computer vision, maturity, colour

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