实验表明额隆内有若干点声衰减为负值及零值、意味着声波沿这些点传输时、声压非但不减小反而增大了。
The experiment showed that in the melon slices there were some points where the sound pressure attenuation coefficient were negative value or zero.
第一种方法采用动态门限检测指纹的隆线，直接给出二值化象图。
The first method adopts dynamic threshold to detect the threads of finger-print, and gives the bilevel image directly.
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