Classification of images of wheat, ryegrass and brome grass species at early growth stages using principal component analysis

Table 1 Selected features illustrating an expert-based approach to plant identification

Species	Visual features used by experts	Relevant image processing features	Feature type
Wheat	Green leaves	g_i, EGI,	Colour
	Width and length ratio	Width, Waddle Disk Ratio	Shape
	Hairless leaves	Uniformity, Entropy	Texture
Brome grass	Reddish at the base,	ERI, r_i, EBI	Colour
	bluish green leaves	b_i, g_i, EGI, b_i, EBI	Colour
	Width and length ratio	Width, Waddle Disk Ratio	Shape
	Small hair on the leaves,	Uniformity, Entropy	Texture
	shiny leaves	Uniformity, Entropy	Texture
Ryegrass	Reddish base and	b_i, EBI, RBI	Colour
	different green colour	g_i, EGI	Colour
	Narrower leaves	Width, Waddle Disk Ratio	Shape
	Hairless shiny leaves	Uniformity, Entropy	Texture

ISSN: 1746-4811