What is the difference between the unary minus operator and the binary subtraction operator?
一元操作符负号和二元操作符减号的区别是什么？
Background subtraction and frame difference method are commonly used moving objects detection methods.
背景差法和帧间差法都是常用的运动目标检测方法。
The difference is found by subtraction.
用减法得出差额。
The paper introduces several methods for vision-surveillance using background subtraction, frame-difference method, symmetrical differencing and a method based on RGB image.
介绍了在视觉监控领域经常用到的几种运动人体检测算法，如背景减除法、帧差法、对称差分法、基于RGB图像的运动检测法。
A simple strategy named 3 frames difference background subtraction is adopted to detect moving object, and movement estimation and compensation are combined to improve processing speed.
采用简单的三帧差背景剪除策略检测运动目标，合并运动估计和背景补偿以加快系统反应速度。
This method bears not only the characteristic "exact to survey object" of background subtraction but also the characteristic "robust to lighting variations" of frame difference.
该方法把背景差法的“准确监测物体”与帧间差法的“对光线具有较强的适应性”结合起来。
This method bears not only the characteristic "exact to survey object" of background subtraction but also the characteristic "robust to lighting variations" of frame difference.
该方法把背景差法的“准确监测物体”与帧间差法的“对光线具有较强的适应性”结合起来。
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