几何失真

弹载SAR图像几何失真校正误差分析

Error Analysis of Geometric Distortion Correction of Missile-Borne SAR Image

彩色线阵CCD颜色几何失真及校正方法

Color Linear Array CCD Geometric Distortion and Correction Methods

C臂X光图像几何失真校正与误差分析

Geometric correction and error analysis of C-arm X-ray image distortion

基于图像非线性配准的MRI几何失真校正

Correction of Geometric Distortion in MRI Based on Non-linear Image Registration

硬X射线衍射增强峰位成像CT的几何失真纠正方法

A Calibration Method for the Misaligned Geometry of Hard X-ray Diffraction Enhanced Top Position Imaging CT

环视SAR成像处理中的几何失真校正算法

Geometric Distortion Correction Algorithm for Circular-Scanning SAR Imaging

研究了双基地穿墙SAR的图像几何失真校正、配准与融合问题。

Geometry correction , image registration and fusion of bistatic through wall SAR are investigated .

磁共振图像（MRI）空间几何失真对立体放射治疗中靶点位置精确度影响的分析

The analysis of spatial distortion in magnetic resonance imaging influence on precision and accuracy of target position in stereotactic radiotherapy

目的通过检测MRI的空间几何失真程度大小，研究其直接用于放疗计划设计的可行性。

Objective Objective To study the feasibility of direct applying MRI to TPS by measuring the geometric distortion of MRI .

与单SAR成像不同，地面高度除了使图像几何失真，还会导致方位分辨率恶化。

Different from single SAR imaging , topographic effects worsen the azimuth resolution of multiple SAR surveys besides geometry distortion .

由于要求成像的过程中，弹体的高度在不断减小，SAR图像存在严重的几何失真。

Because of the decrease of altitude during SAR operation , the SAR image obtained by imaging processing is seriously distorted .

首先，本论文通过分析平行束CT系统的理想成像关系，提出了一种适用于平行束CT系统几何失真校正的方法。

The main work can be summarized as follows : Firstly , by analyzing the ideal geometric relation in parallel CT system , the thesis presents a calibration method of geometric misalignment .

本论文基于衍射增强成像技术开展了如下三方面研究：平行束CT系统的几何失真校正、衍射增强成像中多种信息的CT重建以及衍射增强成像中的图像融合。

This thesis mainly does the research on the calibration of geometric misalignment in parallel computed tomography ( CT ) system , DEI computed tomography with multiple information and the image fusion with DEI images .

因系统几何失真引起的光学放大倍数F随显微视场半径变化，使得实测取样面积误差最大可达1375%。

Because of the system geometric distortion , the optical magnification F changed with the radius , which caused the sampling error of the measure area to be as high as1375 % .

目的：分析模拟靶点MRI空间几何失真的因素，以及其对立体放射治疗中靶点位置精确度的影响程度。

Purpose : analyzing factors of the imitating target spatial distortion in magnetic resonance imaging ( MRI ), and effects of the spatial distortion on precision . accuracy of target position in stereotactic radiotherapy .

该文提出一种新的基于计算机视觉理论的图像空域特征重同步算法，首次采用图像的corner中心角和corner中心距离对水印图像几何失真进行失真校正。

In this paper a novel geometric distortions correction schema for image is proposed , it takes the advantage of the corner center angle and corner certer distance firstly to acquire geometric distortions correction .

接着，针对图像在打印扫描过程中存在的几何失真，提出采用结合harris角点检测和hausdorff距离的方法来校正图像的几何失真。

Then , image in print the scanning process existing geometric distortion , we proposed harris corner detection and hausdorff distance to correct geometry distortion .

在水印检测之前，利用图像中稳定的SIFT（尺度不变特征变换）特征点估计几何失真参数，对可能失真的水印图像进行校正，从而可以准确地提取水印信息。

Before watermarking detection , makes use of stable SIFT feature points of image to estimate geometric distortion factors and corrects watermarked image , then detects right watermarking messages .

本文阐述了60Co集装箱检测系统中数据的采集方式及图像重建方法，分析了线采集周期与成像几何失真的关系，确定了系统数据流的大小及对系统的要求。

This paper describes the data acquisition mode and image reconstruction method in 60 Co container inspection system , analyzes the relationship between line pick period and geometry distortion , makes clear the demand to data transmitting rate .

目前绘制虚拟视点主要采用DIBR方法，在绘制的过程中，深度视频的失真会导致虚拟视点发生几何失真。

In the process of rendering , the main rendering method is DIBR , the distortion of depth video will lead to the geometric distortion in the synthesized view .

结合第三章和第四章提出的水印方案的实验结果，我们发现，DCT对于抵抗信号处理攻击具有很好的鲁棒性，而SVD理论对于几何失真攻击具有良好的数学理论基础。

Integrating the experiment result of the schemes in both the third chapter and the forth chapter , the following result could be discovered : The DCT has well robust in resisting the signal processing , while the SVD theory has sound mathematic theory basic in geometry distortions .

平板显示技术的蓬勃发展，人们对屏幕刷新率和图像几何失真要求越来越高，随之出现了DVI信号，由于DVI信号的差分串行特点，有很广泛的应用。

As the flat-panel display technology vigorous development , people set a higher request to the screen refresh rate and images geometric distortion , then DVI signals present . DVI signal have a wide range of applications due to differential characteristics of serial .

实验表明，对常见的信号处理和几何失真攻击，该算法具有较好地稳健性。

It is robust to common signal processing and geometric distortion .

一种新颖的彩色水印图像几何失真校正算法

An Efficient Geometric Distortions Correction Arithmetic for Color Image Digital Watermarking

基于奇异值分解的、抗几何失真的数字水印算法

A Geometric Distortion Resilient Image Watermarking Algorithm Based on SVD

基于仿射投影的弹载图像几何失真校正方法

Geometric Distortion Correction of Missile-borne Image Based on Affine Projection

对于几何失真较严重的牌照，进行几何校正。

For those license plates of geometric distortion , geometry correction is needed .

基于弧面映射的图像桶形几何失真的校正方法

An Adjustment Method of Image Barrel Geometry Distortion Based on Arc Surface Mapping

国土卫星成像过程的数学模拟与几何失真恢复

The Simulation of Satellite Imaging Process and Distortion Correction

随机几何失真攻击是指在数字音频中恶意地插入跳跃，或通过重采样等手段使相位等特性发生随机抖动，从而对音频数字水印构成严重威胁的行为。

Geometric distortion is a simple and effective attack to digital audio watermarking .