absolute threshold

Also , the paper fixed absolute threshold and vegetation index .

并对绝对阈值和植被指数进行修正。

The serum retinol , relative dose response ( RDR ) and dark adaptation function ( dark adaptation time , absolute threshold ) were determined .

以血清维生素A含量，相对剂量反应（RDR）和暗适应功能（暗适应恢复时间和绝对阈值）检查为指标，在严格膳食控制下，进行了60天实验。

A major portion of a_s could be suppressed by a weak light adaptation , the required intensity being only 10 ~ 3 times the absolute threshold .

暗视α波的大部分能为很弱的明适应光所抑制，这个明适应光的强度大约只相当于绝对阈值的1000倍。

Dark adaptation time within one minute ; ( 3 ) retinal photosensitivity ( absolute threshold ) down to 0.2 × 10 - (?) asb within 30 minutes ;

快速暗适应时间在1分钟以内，（3）视网膜光感绝对阈值，看到0.2×10~（-6）asb视标，时间不超过30分钟；

It is difficult to set the value by comparing the amplitude of differential current from half-wave Fourier algorithm and absolute threshold value to identify magnetizing inrush current from inside fault current .

利用半波傅里叶算法计算的差流基波幅值与绝对门槛值相比较来鉴别励磁涌流和内部故障电流，存在定值整定困难的缺点。

In the fully dark-adapted eye , stimulating the whole visual field with diffuse light at an intensity about 10 ~ 3 times the absolute threshold is capable of eliciting a perceptible b-wave .

对于完全暗适应的眼，强度约为绝对阈10~3倍的弥散光照射全部视域，卽足以引起可被察觉的b波。

Image matching using the sum of the absolute differences with a threshold ;

<3>带阈值的绝对差值总和的影象匹配算法；

Finally after a mean filter and Top-Hat filter , the largest absolute contrast gradient adaptive threshold is used to perform segmentation , and experiments show that this method is effective .

最后采用先均值后形态学Top-Hat滤波，最大绝对对比度自适应门限的方法进行分割，实验表明该方法是有效的。

The second method is using an improved threshold function . This function can overcome non-continuity at its threshold absolute value of hard threshold and the constant bias between soft threshold and original image through modifying a parameter .

方法二是使用改进的阈值函数，通过对比例系数进行调节，可以很好的克服硬阈值函数的在阈值绝对值点处的不连续和软阈值函数估计与原信号间有恒定偏差的缺点。