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。
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。
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。
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。
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。
In digital subtraction angiography, registration techniques were frequently used to reduce motion artifact in subtracted image because of patient motion.
在数字减影血管造影中，常要用配准技术来消除因病人运动而形成的减影图像中的运动伪影。
Purpose: To compare the value between bone image of dual energy subtraction (DE) with direct digital radiography and bone scintigraphy in diagnosing rib lesion.
目的：比较能量减影（DE）骨组织像与核素骨显像对肿瘤患者肋骨病变的诊断价值。
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。
In order to overcome the lack of sensitivity of light change, combining the adaptive background subtraction with the symmetrical differencing obtains the integrity foreground image.
为了克服了减背景法对光照变化敏感的不足，再结合帧差法对运动目标进行检测。
A new cross template was applied to the problem of image registration in digital subtraction angiography.
提出一种基于十字模板的数字减影图像配准快速算法。
In view of the faults of traditional method, a new background subtraction method for video image sequence is proposed.
针对传统背景提取算法的不足，提出一种新的视频序列背景提取方法。
On the basis of two kinds of image models in color space, shadows of objects have been detected by background subtraction approach.
在应用两种彩色空间模型的基础上，用背景差分法对阴影进行了检测。
The key of background subtraction is to extract and update the background image adaptively in changeable road environment affected by all kinds of factors such as weather and illumination condition.
由于实际交通道路状况受气候、光照等多种因素的影响，变化非常复杂，因此如何设计一种自适应的背景提取与更新算法以适应实际环境的变化，是背景差法的关键所在。
The algorithm can quickly and precisely mark the moving object and its trail by functions of image enhancement, morphological operation, and interframe background subtraction.
该算法运用图像增强、形态学操作、图像差分法，能快速准确标注出移动的物体及其移动轨迹。
Project frames with motion parameters, and the intersection of two subtraction results of neighbor frames will give the moving object area. Last we can calculate the panorama image.
利用运动参数进行投影，然后用多帧相减并求交集，估计出每帧图像中运动物体存在的区域，最后计算得到了全景图。
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；
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；
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