subtraction

n.

减，减法；减除法；减去；

复数：subtractions

digital subtraction angiography数字减影血管造影；数字减影血管造影术

1. Two from five is a simple subtraction.
   五减二是简单的减法。
2. Subtraction is the inverse operation of addition.
   减法是加法的逆运算。

Background subtraction techniques: a review
Non-parametric Model for Background Subtraction
Non-parametric Model for Background Subtraction
ViBe: A Universal Background Subtraction Algorithm for Video Sequences
Suppression of acoustic noise in speech using spectral subtraction
Improved Adaptive Gaussian Mixture Model for Background Subtraction
Effective Gaussian mixture learning for video background subtraction
A statistical approach for real-time robust background subtraction and shadow detection
Suppression of acoustic noise in speech using spectral subtraction. IEEE Trans. ASSP, ASSP-27(2): 113-120
Quantification of articular cartilage in the knee with pulsed saturation transfer subtraction and fat-suppressed MR imaging: optimiz...