平均差值 meaning in Chinese

mean difference
mean range

The values of r subtracted by g of the given citrus , leaves , or branches are very similar , but the values of g subtracted by b or r subtracted by b of citrus are different from that of leaves and branches . a rule for segmenting citrus from background was put forward that the pixel belongs to citrus if the value of r subtracted by b larger than the threshold value ( t ) , which was developed by dynamic threshold segmentation method , otherwise the pixel belongs to background
研究发现水果、树叶、树枝三者间的r与g的对应坐标值基本上分布在45对角线上；树叶、树枝的g与b和r与b的对应坐标值分布在或接近于45对角线上，而水果的g与b和r与b的对应坐标值偏离45对角线，分布在45对角线下方，且果实的r - b的平均差值比g - b的平均差值要大。