绝对值符号，最早为计算机语言。“||”为绝对值符号。
给出了一类特殊的非线性规划问题，其目标函数中带有绝对值符号，这类问题可以转化为线性规划问题来求解。
Presents a special nonlinear programming problems, its objective function contains absolute value symbol, this kind of problem can be transformed to the solution of a linear programming problems.
系统的输出信号的偏振度还随着信号原始啁啾系数绝对值的增大而减小，但与啁啾系数的符号无关。
And it decreases also with the increase of absolute value of the initial pulse chirp coefficient, but has no relation with the sign of chirping coefficient.
在边界提取时选取有一定间距的像素分别计算三原色梯度，把其中绝对值最大的梯度作为边界存在的判据之一，同时根据二阶导数符号变化提取边界。
Third, the gradient between two pixels that have certain distance was calculated in three color components respectively, and then the maximum of gradients of the three was attained.
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