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图像质量客观评价的研究
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摘要
视觉信息是人类获取信息的最主要途径,它通过人自身的视觉感知系统获取,其中图像信息是最主要的组成部分。随着个人计算机、数字通信、多媒体和网络技术的发展,数字图像和数字视频日益成为信息最重要的载体之一,已经深入到人们的日常生活,普及到千家万户。在数字图像的获取、处理、编码、存储、传输和重建的每一个步骤中,通常都会对图像的质量产生影响,如何评价图像质量成为图像处理、计算机视觉领域的一个基本而文富有挑战的问题。本论文研究图像的结构失真,并且充分利用图像的结构失真特性设计客观图像质量评价方法,使其能够自动精确的评价图像的质量。
     本论文的研究内容主要围绕图像结构重要性表示和度量、图像投影能量和图像方向投影等关键技术进行研究工作。主要工作和创新成果总结如下:
     (1)将匹配追逐算法用于图像质量评价中,并且为满足图像质量评价的需求进行了修改。匹配追逐算法是一种将图像在基函数集上进行投影提取图像结构的算法,主要应用于图像和视频编码中。为满足图像质量评价的需求,对匹配追逐算法进行了改进,使用该算法对参考图像进行分解以提取重要的结构信息。
     (2)提出了一种图像结构特征表示和重要性度量方法。人眼天然具有获取图像结构的特性,一般而言,自然图像中由于各个结构所表示的内容不同,不同的结构区域往往在视觉上具有不同重要性,基于此种假设,利用改进的匹配追逐算法对图像进行结构提取,并且对结构进行特征表示和重要性度量。
     (3)提出了一种基于结构重要性度量的质量评价方法。该方法提出了一种结构重要性度量的概念,并且用在图像质量客观评价中,通过对参考图像的结构进行提取,按照重要性排列获得不同图像结构信息和重要性度量,通过计算失真图像与参考图像结构信息的差异获得图像的失真度量和质量值。
     (4)提出了一种基于投影能量的质量评价方法。该方法将图像的失真建模为投影值的差异,在此基础上提出了一种基于信号投影能量的图像质量客观评价方法。该方法使用了简单的投影方法,参数简单,具有高效以及低复杂度的特点,可以满足各种实时需求的应用。由于该算法简单,易于实现,期望成为基于像素统计算法比如PSNR的一个扩展。
     (5)提出了一种基于方向投影的质量评价方法。图像的结构信息主要由带有方向特性的像素、边缘和形状等组成,使用图像在各个方向上的投影来表示图像的方向特性,图像质量的改变可以建模为图像在方向特性上的改变。该方法通过Radon变换来统计图像在各个方向的投影,建立方向投影矩阵来表示图像的方向特性,最后计算失真图像和参考图像方向投影矩阵之间的差异来统计图像的失真度量。
The uppermost way which human beings learn from is visual information that is received by human perceptional system,and among the visual information photos are the matters of primary importance.With the development of PC,digital communication,multimedia and network technology,as one of the most important informational intermedium,digital image/video has penetrated into individual's daily life and popularized among people.In the orocedures of image processing system,e.g., acquisition,processing,coding,storage,transmission and reproduction,digital image may be in degradation in visual quality,so evaluating image quality becomes a fundamental job in the field of image processing and computer vision.The objective of this thesis is to research on the structural distortion of the image,and further design the algorithms of objective assessment to evalue the image quality automatically and accurately by using the characteristics of structural distortion.
     In this thesis,we explore which consists of the novel idea about the expression and measurement of image structural importance,the image's projection energy and directional projection.The main work and innovations are listed as follows:
     (1)Introduce matching pursuit into image QA,and it is modified for the image QA applications.Matching pursuit projects the image on the basis set and extracts the image structure under the rule of the largest energy,and it is used widely in image and video coding.We modify matching pursuit to meet the image QA applications,and decompose and extract the important structural information from the reference image.
     (2)Propose an approach of expression of image structural information and measurement of structural importance.Human visual perception is hilly adaptive for extracting structural information from a scene.Generally according to the differences of the characteristic which the structure represents,the different structural information is always of different importance.On such an assumption,modified matching pursuit is introduced into extracting the structural information from images,charactering the structural information and measuring its importance.
     (3)Propose an image QA approach based on the importance of structural information.The proposed idea of structural importance is introduced into image QA.By extracting the structural information from the reference image, the different structural information and its importance measurement is gained.The structural distortion and quality predictive score are calculated by comparing the difference between the structural information of reference images and distortion ones.
     (4)Propose an image QA approach based on projection energy.On the assumption that any image distortion could be modeled as the difference of the PEVs(projection energy vector)between the reference image and the distortion one,an image QA approach is proposed based on signal projection energy.This approach uses the simple projection operator and simple parameters and it achieves high efficiency and low computational complexity,so it is adaptive to the real-time applications.This approach is of simple parameters and easy to calculate,thus it expects to work as an expansion for those mathematically defined ones for example PSNR.
     (5)Propose an image QA approach based directional projection.The image structure contains many pixels,edges and shape with directional characteristic mainly,and the directional characteristic is charactered by the images' projection on different direction.The distortion of the structural information could be modeled as the alteration of the directional characteristic.This approach is implemented by Radon transform which calculates the directional projection of images and develops the DPV (directional projection-based vector)to represent the directional characteristic.The structural distortion is calculated by comparing the difference of the DPVs between reference images and distortion ones.
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