Calculates the convexity of a shape

Calculated using a ratio of the eigen values (inertia axis)

Usage

coo_convexity(coo)

Source

Rosin PL. 2005. Computing global shape measures. Handbook of Pattern Recognition and Computer Vision. 177-196.

Arguments

coo

a matrix of (x; y) coordinates.

Value

numeric for a single shape, list for a Coo

See also

Other coo_ descriptors: coo_angle_edges(), coo_angle_tangent(), coo_area(), coo_boundingbox(), coo_chull(), coo_circularity(), coo_eccentricity, coo_elongation(), coo_length(), coo_lw(), coo_rectangularity(), coo_rectilinearity(), coo_scalars(), coo_solidity(), coo_tac(), coo_width()

Examples

coo_convexity(bot[1])
#> [1] 0.8003675
bot %>%
    slice(1:3) %>% # for speed sake only
    coo_convexity()
#> $brahma
#> [1] 0.8003675
#> 
#> $caney
#> [1] 0.9409434
#> 
#> $chimay
#> [1] 0.9454935
#>