In this paper , the part of apis based on minutia features includes mainly computing orientation , filtering , binarization , thinning , feature extraction , postprocessing and minutia matching ; the part of apis based on statistical features is composed of reference point location , extracting feature , classification and matching . some new approaches are brought forward : 1 ) in the preprocessing , a new binarization method of fingerprint images based on the orientation and the dynamic threshold is proposed , which has the excellent capability of noise resistance . this method makes fully use of the orientation and the characteristics of grayscale change , gets the binarized images from the primitive fingerprint images directly , instead of the series of processing such as smoothing , enhancement and binarization 本论文对这两种系统做了深入地研究,从基于细节点特征的系统中求取指纹方向图? ?滤波? ?二值化? ?细化? ?特征提取? ?后处理,到基于统计性特征的系统中选取指纹图像参考点? ?提取统计性特征? ?分类? ?匹配等环节,都一一进行了讨论,并提出了一些新方法: 1 )在基于细节点特征系统的预处理部分,本论文提出一种新的基于方向图具有动态阈值的指纹图像二值化方法,这种算法能够在保持特征点不丢失的基础上一次性完成一般指纹图像处理中的无效块分割、增强、滤波、二值化的过程。
In intra - frame postprocessing error concealment techniques in this dissertation , interpolating pixel values within a damaged macroblock from its four 1 - pixel - wide boundaries and introducing the texture information from its four adjacent blocks can improve the quality of reconstructed image . it was found that the visual texture in damaged macroblocks can be reconverted with his algorithm in experiment 本文提出的一种基于视频帧内后处理的错误隐藏算法,采用帧内纹理恢复的内插技术,将相关性最强的象素作为损坏块内插的信息源,并引入相邻块的纹理信息,从而获得较好的图象恢复质量。
The validity of the subsection simulation method is proved , in which postprocessing technology is widely used . the sixth , the static simulation is neces sarily to find out the dynamic system ' s initial state for dynamic simulation . the gun is looked upon as a hyper - equilibrium structure , and a so - called " parallel projection method " is brought forward for the gun ' s static simulation 提出了一种求解线性方程组的方法?平行投影法,针对adams对超静定系统静态分析不力的情况,研究了求解全炮静态问题的途径和方法,并应用平行投影法求解车体悬挂的初始平衡力,求得了较符合客观事实的解,从而完成了火炮发射前的静态分析。