Methods of Measuring Bruise Volume of Pear (Pyrus Communis L.)

Figures & data

Table 1 Formula of five methods for calculation of bruise volume

		Formula of bruised volume
Method of bruised volume calculation	Figure of bruised volume	Circle	Ellipse
Bruise thickness
Full depth
Enclosed volume
Unbruised volume removed
Ellipsoid

Figure 1 Measurements taken to calculate bruise size.

Figure 2 Determining radius of curvature with equation.

Table 2 Linear regression for volume calculation methods

	All impacts						Low impacts
	Circular			Elliptical			Circular			Elliptical
Method	m	C	R^2	m	C	R^2	m	C	R^2	m	C	R^2
A	0.98	50.9	0.94	0.98	−0.87	0.98	1.50	−38.9	0.90	0.87	−32.1	0.91
B	1.32	123.1	0.93	1.22	46.2	0.97	1.84	−11.5	0.95	1.35	1.9	0.94
C	1.23	141.8	0.93	1.26	63.4	0.97	1.74	−8.1	0.90	1.42	6.9	0.98
D	0.97	82.1	094	0.93	14.7	0.98	1.50	−31.9	0.95	0.91	−21.2	0.95
E	1.32	79.8	0.94	1.23	−2.4	0.98	1.76	−43.2	0.91	1.15	−31.8	0.95
A: bruise thickness; B: full depth; C: enclosed volume; D: unbruised volume removed; E: ellipsoid; m: slope of regression line; C: constant; and R^2: coefficient of determination.