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1·The basic principle and some useful methods of real-time image subtraction are described in this paper.

本文论述一种实时图像相减的原理和方法。

2·Two methods of initial estimates are proposed: (1) using real time image subtraction scheme and a micro motion compensation mechanism to take zero constantly as initial estimates;

对相关迭代算法中的初值估计问题进行了研究，提出两种初值估计方法：（1 ）利用“实时相减”和“精密调节”相结合的方法而获得零初值；

3·In order to improve the accuracy of the measurement of superposition hole, an approximate solution based on image subtraction technique to identify the superposition holes was put forward.

为了提高纸靶重孔的测量准确性，提出一种基于图像减影技术的重孔识别方法。

4·With a phase grating located at Fourier frequency plane, optical image subtraction is obtained as a result of the coherent superposition of the zeroth and the first order of the diffracted light.

置一位相光栅于相干光学处理系统频谱平面，利用其零级与一级衍射光的相干迭加实现图象相减。

5·The quality of the subtraction image was improved and computation time was reduced by selecting edge pixels as triangular control points.

通过计算图像梯度信息，选取边缘区域像素作为控制点，既改善减影图像质量，又提高运算速度。

6·Conclusion Digital subtraction MRI is an effective and simple post-processing technique, which is also time-saving and reliable with high image quality.

结论MR数字减影技术是一种简便易行而有效的图像后处理方法，而且省时、可靠和成像质量高。

7·Our results show significant improvement in calculation speed using the cross template while the quality of the resulting subtraction image remains high.

实验结果表明，改变模板形状后，图像配准速度显著加快，且减影图像质量保持良好。

8·The experimental results show that using the proposed measure can produce better registration results in Digital Subtraction Angiography (DSA) image registration.

由于设计的复数小波对平移是不敏感的，我们提出的相似性测度对图像的局部形变具有较好的鲁棒性。

9·The paper introduces several methods for vision-surveillance using background subtraction, frame-difference method, symmetrical differencing and a method based on RGB image.

介绍了在视觉监控领域经常用到的几种运动人体检测算法，如背景减除法、帧差法、对称差分法、基于RGB 图像的运动检测法。

10·The quality of the subtraction image is improved by the multi exposure.

采用多次曝光技术，提高了相减象的质量。