Algorithms on fingerprint preprocessing are first studied in unit 3 . point direction image is acquired by using discrete direction method . then block direction image is acquired 采用离散方向法来求取指纹的点方向图，进而用直方图法得到指纹的块方向图。
One way to picture this difference is to think of revision control as a directed graph ( in the graph theory sense ) where nodes are revisions and edges are changesets 图式化这些不同的一个方式是把版本控制想成一个方向图（按照图论理论） ，其中节点是版本而边是变更集。
3 . by local direction - graph and nondirectable level , we position automatically the center of fingerprint image and finish the assortment of fingerprint image . 4 通过计算指纹的局部方向图和不可定向程度，对指纹进行定位和分类，从而实现特征提取，并存入指纹库。
Similarly , the paper also makes an analysis of the effect that the truncation error of finite scanning has upon the far - field pattern and then introduces the consequent method of compensation 随后分析了扫描面截断误差对远场方向图的影响，并给出了相应的补偿方法。
With the algorithm pattern synthesis for uniform and nonuniform arrays is performed and mainlobes and sidelobes can be controlled effectively as designed 分别对等间距和不等间距阵列进行了方向图综合，都能够按设计要求有效地控制主瓣电平和副瓣电平，使其达到预期的效果。
Finally , on base of analysis of amplitude - phase consistency , given a method to compensate the the amplitude and phase of the input to approach the ideal pattern 最后通过对天线阵幅相特性的观察分析,提出了一种利用阵元互耦引起的阵元幅相差异来得到所需方向图的新途径。
At last , two circular monopole ultra - wideband antennas with different radius are made . by experiments , the return loss , radiation pattern and gain of the 最后,本课题实际制作了不同尺寸的圆盘单极超宽带天线,分别测量了天线的反射损耗,方向图和增益,并与仿真结果加以比较。
After an intensive analysis of several methods of computing the orientation image , we select the " least square estimate " method in our research 我们对多种求解指纹图像方向图的方法进行了深入的分析与比较，并最终选定了“最小平方估计法”作为我们求解指纹图像方向图的方法。
The measured single antenna patterns are quite different from simulated ones , which may be caused by improper measurement . the gain of the single antennas are between 4 . 4dbi and 7 . 1dbi 贴片单元实测方向图与仿真结果相差较大,疑与测试方法不当有关;单元增益在4 . 4dbi ~ 7 . 1dbi之间。
The test results accord with the simulation results well . grounded on the simulation and measurement , it proves that this antenna can be the dual - band dual - polarized antenna unit 最后,对天线阵元进行组阵分析,研究了天线单元间距对天线方向图的影响,并得出了优化的天线阵元间距值。
