查询词典 roi

In this thesis, the theory and algorithm of GPR ROI extraction and the targets detection are investigated.

摘要本文的主要内容是研究探地雷达的ROI提取及目标检测的理论与方法。

I much preferred La Bergere et le Ramoneur (the Shepherdess and the chimney sweep), a 1953 film, redone by the Frenchman Paul Grimault in 1980 as Le Roi et l'Oiseau, or the 1947 film The Little Hunchbacked horse by the Russian Ivan Ivanov.

我最喜欢的是《牧羊女与扫烟筒的人》，那是部1953年的电影，1980年被法国人Paul Grimault翻拍成为Roi et l'Oiseau，还有1947年俄罗斯Ivan Ivanov的《小驼背骑兵》。

On the other hand, in some areas in medicine, it may be sufficient to maintain high image quality only in ROI, i.e., in diagnostically important regions.

针对系数提升ROI算法的固有缺点，提出了一种基于率失真优化截取内嵌码块编码算法的医疗图像矩形感兴趣区域编码方法。

The validities of amplitude features and their extraction method suitable in high-frequency SAR image are analyzed when they are used in UWB SAR image. An extraction approach of amplitude feature based on target contour is presented, and the corresponding effective amplitude features are proposed. The old dihedral angle model is analyzed and improved. The approach of azimuthal feature extraction is proposed based on the conclusion of the improved dihedral angle model. The problems, which appear when the common change detection methods are used to extract the change feature based on ROI, are analyzed. And a robust and feasible extraction approach is presented.

分析了适于高频SAR图像的幅度特征及其提取方法用于UWB SAR图像时的有效性，提出了基于目标轮廓的幅度特征提取方法及相应的适用幅度特征；分析了已有二面角模型在建模过程中存在的问题并进行了改进建模，基于改进二面角模型结论提出了方位向特征提取方法；分析了常用变化检测方法用于提取ROI变化特征时存在的问题，提出了一种稳健可行的变化特征提取方法。

Based on the priori knowledge of a point scattering - hyperbolic feature of subsurface objects in GPR B-Scan images, a method of ROI extraction with Neural Network is presented.

在分析了均匀介质中的目标回波特征一双曲线形态的产生机理和基本特征的基础上，提出了一种利用神经网络进行ROI提取的方案，根据GPR数据解译的特点，本文设计了相应的B-Scan图像预处理方法和神经网络结构、训练及测试方法，使用塑料管及其他目标的B-Scan实测数据对神经网络进行训练与测试。

The SNR of brain white matter and the background standard deviation were measured within ROI,which cov ered a large homogeneous area of white matter.The mean pixel values were recorde d within the ROI which was positioned of the head of the femur.

设定兴趣区，并测定脑白质均匀区域的信噪比及背景的标准差，以及以盆腔股骨头为ROI，记录ROI的平均值，交替测量肌肉区域的平均值及背景的标准差。

Thedecoder the proposal algorithms required is compatible with JPEG2000 standard.TheDIRC rearranges truncation point for every codeblock in each layer. It assigns higherbitrate to ROI and lower bitrate to non-ROI and combines them to codestream. TheDWARC can achiev the accurate bitrate control in each layer.

本文第三章探讨了感兴趣区域编码问题，提出了二种动态、码块优先的ROI编码算法DIRC、DWARC，二者均支持多个感兴趣区域有各自独立的优先级并且优先级可以在编码过程中动态改变，其生成码流与标准完全兼容。

A new method which could extract region of interest was introduced. Based on partitions of indiscernibility relations and rough approximation, ROI could be extracted automatically and precisely.

为实现空瓶检测中感兴趣区域ROI的自动精确标定，介绍了一种基于粗糙集不可分辨关系划分及粗近似进行ROI区域提取的新方法。

The equal distance 3-improved-coverage number of beacon sending position is presented according the acreage of ROI.Then a simple method is put forward to calculate the coordinates of the sending positions in rectangular ROI.Aiming at the shortage of the existent sequence algorithm,when beacon moves according to the path and emits RF signals at every position,the ant colony algorithm is applied to the position sequence so as to get the beacon sending position.Further,in this algorithm the sensors could work out their position with trilateration.

根据ROI面积给出了等距三重优化覆盖此ROI所需要的信标发射位置数量计算方法；随后对矩形ROI提出了一种简单的信标发射位置确定方法；针对现有的遍历发射位置点的路径遍历算法的不足，提出了一种新的应用蚁群算法的信标发射位置点的遍历算法，并利用该算法对基于三边测量方法进行传感器节点定位。

Firstly, the image isencoded as normal. Then it reallocates the bits allocated for ROI and background. Bythis way, ROI can achieve higher performance. Data may be damaged or missed while transmitted in internet or wireless channel.

DIRC算法在各编码层对ROI和背景分别设定目标码率，在最终形成的码流中感兴趣区域码块其在各层的截止门限由高码率确定，而背景码块对应的截止门限由低码率决定。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。