The shear components of strain tensors for matrix and twin crystal of winned martensite were roughly opposite after calculation,and the strain energy would be reduced.The growth of martensitic plates along the normal ...The shear components of strain tensors for matrix and twin crystal of winned martensite were roughly opposite after calculation,and the strain energy would be reduced.The growth of martensitic plates along the normal direction of the twin plane may depend upon the effect of self-accommodation between the matrix and twin crystals.Based upon the analysis on the displacement vectors of the normals for different habit planes,the{10,3,15}_f plane could form the macroscopic invariant habit plane;but the(55)_f,(22)_f,and(11)_f planes are difficult to become the invariant planes.展开更多
Generally, a confocal Fabry-Perot interferometer is only able to detect the out-of-plane component of a displacement field; while the in-plane component often has the information about the material which cannot be fou...Generally, a confocal Fabry-Perot interferometer is only able to detect the out-of-plane component of a displacement field; while the in-plane component often has the information about the material which cannot be found in this out-of-plane component. In this paper, based on a confocal Fabry-Perot interferometer set-up for detecting the out-of-plane component of a laser generated acoustic field, a technique is developed to detect both the out-of-plane and in-plane displacement components simultaneously with a novel two-channel confocal Fabry-Perot interferometer.展开更多
The objective assessment of image quality is important for image processing, which has been paid much attention to in recent years. However, there were few reports about objective quality assessment methods for geomet...The objective assessment of image quality is important for image processing, which has been paid much attention to in recent years. However, there were few reports about objective quality assessment methods for geometrically distorted images. Different from the routine image degradation processing （for example, noise addi- tion, contrast change and lossy compression）, the geo- metric distortion results in the changes of the spatial relationship of image pixels, which makes the traditional quality assessment algorithms, such as mean square error （MSE） and peak signal to noise ratio （PSNR） failure to obtain expected assessment results. In this paper, a full reference image quality assessment algorithm is proposed specifically for the quality evaluation of geometrically distorted images. This assessment algorithm takes into account three key factors, such as distortion intensity, distortion change rate and line feature index for perceptual quality assessment of images. Experimental results in this study show that the proposed assessment algorithm not only is significantly better than those of the traditional objective assessment methods such as PSNR and structural similarity index measurement （SSIM）, but also has significant correlation with human subjective assessment.展开更多
文摘The shear components of strain tensors for matrix and twin crystal of winned martensite were roughly opposite after calculation,and the strain energy would be reduced.The growth of martensitic plates along the normal direction of the twin plane may depend upon the effect of self-accommodation between the matrix and twin crystals.Based upon the analysis on the displacement vectors of the normals for different habit planes,the{10,3,15}_f plane could form the macroscopic invariant habit plane;but the(55)_f,(22)_f,and(11)_f planes are difficult to become the invariant planes.
基金This work was supported by the National Nature Science Foundation of China (No. 10174025 and No.10134020).
文摘Generally, a confocal Fabry-Perot interferometer is only able to detect the out-of-plane component of a displacement field; while the in-plane component often has the information about the material which cannot be found in this out-of-plane component. In this paper, based on a confocal Fabry-Perot interferometer set-up for detecting the out-of-plane component of a laser generated acoustic field, a technique is developed to detect both the out-of-plane and in-plane displacement components simultaneously with a novel two-channel confocal Fabry-Perot interferometer.
文摘The objective assessment of image quality is important for image processing, which has been paid much attention to in recent years. However, there were few reports about objective quality assessment methods for geometrically distorted images. Different from the routine image degradation processing （for example, noise addi- tion, contrast change and lossy compression）, the geo- metric distortion results in the changes of the spatial relationship of image pixels, which makes the traditional quality assessment algorithms, such as mean square error （MSE） and peak signal to noise ratio （PSNR） failure to obtain expected assessment results. In this paper, a full reference image quality assessment algorithm is proposed specifically for the quality evaluation of geometrically distorted images. This assessment algorithm takes into account three key factors, such as distortion intensity, distortion change rate and line feature index for perceptual quality assessment of images. Experimental results in this study show that the proposed assessment algorithm not only is significantly better than those of the traditional objective assessment methods such as PSNR and structural similarity index measurement （SSIM）, but also has significant correlation with human subjective assessment.
