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数字图像分辨率
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  digital image resolution
     An Improved Model of Image Super-resolution and Discussion on Digital Image Resolution
     一种改进的图像超分辨率模型与数字图像分辨率的研究
短句来源
     From the perspective of the overlapping on frequency domain,a tentative definition of digital image resolution is devel oped,which can provide a new approach and evaluating method to digital image su per-resolution reconstruction.
     在图像混迭的基础之上,提出了一种数字图像分辨率的概念,由此概念出发,可以为数字图像超分辨率重建提供新的途径和评价方法。
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  “数字图像分辨率”译为未确定词的双语例句
     Conclusion The scanning resolution used to rebuild images should double that of the display resolution. And 144ppi is the most suitable for radiograph film in teleconsultation. The most appropriate value of gamma is 3.0 with regard to the contrast resolution;
     结论 扫描重建数字图像分辨率应选择两倍于屏幕频率 ,14 4ppi分辨率最适合远程医疗用 ,图像对比分辨阈值以γ值 3 .0最佳 ,有效范围不超出 2 .5至 3 .5为宜。
短句来源
  相似匹配句对
     Singular Value Decomposition of Digital Image
     数字图像的奇异值分解
短句来源
     Definition of digital picture
     数字图像清晰度
短句来源
     Scaling Transformation of Remote Sensing Digital Image with Multiple Resolutions from Different Sensors
     多传感器不同分辨率遥感数字图像的尺度转换
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     FIGURE
     数字
短句来源
     Digital
     数字
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  digital image resolution
This digital image resolution corresponds to 0.5 mm per pixel of actual core.
      


Objective To improve the quality and definition of radiograph for telemedicine, and to master the preferences for rebuilding digital images. Methods Forty two rebuilt CT films were divided into two groups upon the base, then the definition of images was analyzed by calculating the gray scale rate. Results There existed significant difference between two groups on the brightness ( P <0.01) and no difference in group on the resolution. It was found that there is, linear correlation between the gamma value...

Objective To improve the quality and definition of radiograph for telemedicine, and to master the preferences for rebuilding digital images. Methods Forty two rebuilt CT films were divided into two groups upon the base, then the definition of images was analyzed by calculating the gray scale rate. Results There existed significant difference between two groups on the brightness ( P <0.01) and no difference in group on the resolution. It was found that there is, linear correlation between the gamma value and the brightness, and curvilinear correlation between the gamma value and the gray scales rate in both groups. The peak segment of the curve in group H always goes a little behind that in group L. There was no significant difference between two groups in term of the maximum gray scale rate, the information loss rate, and the composing of the max gray scale rate and the minimum gamma value ( P >0.05). Conclusion The scanning resolution used to rebuild images should double that of the display resolution. And 144ppi is the most suitable for radiograph film in teleconsultation. The most appropriate value of gamma is 3.0 with regard to the contrast resolution; the favorable range of gamma value is between 2.5 and 3.5. The definition and the information loss rate of rebuilt images can be estimated by using gray scale rate. [

目的 提高用于远程医疗之放射影像的质量和清晰度 ,提供医学影像重建的制作条件。方法 对 42张CT片依片基分为两组进行复制 ,通过计算灰阶率分析图像清晰度和影响清晰度因素。结果 亮度值组间相差明显 (P <0 .0 1) ,组内三种分辨率间无显著差异。组间和组内分辨率间灰阶率无显著差异。两组亮度值与γ值均呈线性相关 ,灰阶率与γ值均呈曲线相关 ,H组曲线峰值段略落后于L组。组间最大灰阶率、信息损失率、最大灰阶率 /最小γ值构成比无显著差异 (P >0 .0 5 )。结论 扫描重建数字图像分辨率应选择两倍于屏幕频率 ,14 4ppi分辨率最适合远程医疗用 ,图像对比分辨阈值以γ值 3 .0最佳 ,有效范围不超出 2 .5至 3 .5为宜。利用灰阶率可评估重建数字图像的清晰度和扫描信息损失率。

On the basis of Har ri s theory of image super-resolution,the inconsistency in the traditional theory of image super-resolution is analyzed and the model of image formation is impr oved.Based on this model,this paper demonstrates that the overlapping on frequ ency domain is one of the most crucial factors that influences digital image res olution.Fur-thermore,this overlapping is inevitable and unable to be removed completely.In the process of digital image super-reso-lution reconstruction, Nyquist Sampling Theory...

On the basis of Har ri s theory of image super-resolution,the inconsistency in the traditional theory of image super-resolution is analyzed and the model of image formation is impr oved.Based on this model,this paper demonstrates that the overlapping on frequ ency domain is one of the most crucial factors that influences digital image res olution.Fur-thermore,this overlapping is inevitable and unable to be removed completely.In the process of digital image super-reso-lution reconstruction, Nyquist Sampling Theory is not suitable.Moreover,the reconstruction should be aimed at decreasing this overlapping according to the requirement on the accura cy of super-resolution reconstruction.From the perspective of the overlapping on frequency domain,a tentative definition of digital image resolution is devel oped,which can provide a new approach and evaluating method to digital image su per-resolution reconstruction.

论文从Harris等人提出的图像超分辨率理论出发,分析了传统图像超分辨率理论的不妥之处,并在此基础之上对成像模型进行了改进。以改进模型为依据,指出数字图像频谱的混迭是影响数字图像分辨率的主要因素之一,并且这种混迭是不可避免的,也是不可能被完全消除的。在数字图像超分辨率重建中,奈奎斯特抽样定理已经不能适用了,此种重建过程应该是减小混迭的过程,根据重建精度的要求,相应的来减小混迭。在图像混迭的基础之上,提出了一种数字图像分辨率的概念,由此概念出发,可以为数字图像超分辨率重建提供新的途径和评价方法。

Improvemnet of imaging resolution is a hot topic, it plays the important role in modern war. The relation of pixel gray-level of low resolution images and high resolution image is found based on charge coupled device (CCD) imaging theory, and a new approach for improvement of CCD imaging resolution is proposed. A high resolution image is obtained by moving multi-shift images with low resolution, the objective of improvement of CCD resolution for many times is attained. Making the indeterminate equation into...

Improvemnet of imaging resolution is a hot topic, it plays the important role in modern war. The relation of pixel gray-level of low resolution images and high resolution image is found based on charge coupled device (CCD) imaging theory, and a new approach for improvement of CCD imaging resolution is proposed. A high resolution image is obtained by moving multi-shift images with low resolution, the objective of improvement of CCD resolution for many times is attained. Making the indeterminate equation into unique-value equation is the essence of this approach.The simulation examples show that the approach for improvemnet of CCD imaging resolution is right, resolution can be improved 2 times, 3 times and even N times in theory. In addition, operation time is lower than other methods.

提高数字图像的分辨率一直是一个热门话题,在现代高技术战争中发挥着重要的作用。从CCD成像原理出发,分析了1/2像素错位的低分辨率图像与高分辨率图像各像素灰度值之间的对应关系,提出了一种新的提高CCD成像分辨率的方法。通过多次移动CCD获得多幅低分辨率图像,按照介绍的算法合成一幅高分辨率图像,达到了CCD分辨率提高多倍的目的,算法的本质是使一超定解多元方程组变成有唯一解的方程组。通过仿真实验和分析表明所建立的提高分辨率的方法是正确的,分辨率可以提高2倍、3倍甚至更高在理论上是可行的,而计算时间的复杂度远远小于其它方法。

 
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