Ridge orientations and ridge spatial frequencies in various regions of the palm represent the intrinsic characteristics of a palmprint image.
掌纹中不同区域的纹线方向和空间频率代表着掌纹图像内在的特征。
2
Analytical expressions of coupling frequencies of Raman free-electron lasers are deduced based on the physical image of the coupling between negative-energy space-charge wave and EM wave.
从负能空间电荷波与电磁波耦合的物理图像出发推导了喇曼散射模式自由电子激光器耦合频率的解析表达式。
3
Retrieved image with good visual effect can be obtained for the digital image containing several space frequencies under proper recording conditions.