Soybean Saponin Content Detection Based on Spectral and Image Information Combination

Table 1

Meaning of soybean image feature information.

Feature information	Meaning
Area	Number of pixels in the soybean outline area
Perimeter	Number of pixels of the soybean contour curve
Major axis	Number of pixels of the major axis of the minimum circumscribed ellipse of soybean
Minor axis	Number of pixels of the minor axis of the minimum circumscribed ellipse of soybean
Roundness	. Among them, represents roundness, and it is similar to the circle if R is closer to 1; represents the perimeter of the soybean outline, represents the pi ratio, and represents the soybean area
Eccentricity	Eccentricity of the smallest circumscribed ellipse of soybean
Aspect ratio	Ratio of the major axis and minor axis of the smallest circumscribed ellipse of soybean
Rectangle-area ratio	Ratio of the area of the smallest circumscribed rectangle of soybean to the area of soybean
Circle-area ratio	Ratio of the smallest circumscribed circle area to the soybean area
Equal-area-circle diameter	Diameter of a circle equal to the soybean area
Edge variation coefficient	Ratio of standard deviation and mean value of each pixel point from the center of soybean image gravity to its edge