Fig. 5From: Quantitative phenotyping and evaluation for lettuce leaves of multiple semantic componentsThe lamina-based approach for vein architecture analysis. A Lamina classification and vein angle representation. B Lamina analysis. Blue lines indicate the skeleton line segments of the mid-rid; blue circles represent attachment points; two red arrows from each attachment point represent vein angle, and angle values are shown at the node furthest from the mid-rid; grey lines indicate the position of the petioleBack to article page