This paper proposes an enhanced Edge Matching Rate (EMR) to gain good image regis-tration based on Generalized Acreage (GA). Traditional EMR considers only matched pixels sum without concerns of the cause of unmatched...This paper proposes an enhanced Edge Matching Rate (EMR) to gain good image regis-tration based on Generalized Acreage (GA). Traditional EMR considers only matched pixels sum without concerns of the cause of unmatched pixels and the relationship between matched pixels. The modified EMR introduces the new concept of generalized acreage to measure the overlaying parts between the target image and the model. It also defines similarity of local occlusion and of local dithering to measure interference degree. Not only edge points are considered but also non-edge points, occlusion, and dithering. Using the same preprocessing, the experiments match images based on tra-ditional EMR and the proposed EMR separately. Based on the proposed EMR the paper achieves more stable registration and higher precision.展开更多
A novel method for multi-image matching by synthesizing image and object-space information is proposed. Firstly, four levels of image pyramids are generated according to the rule that the next pyramid level is generat...A novel method for multi-image matching by synthesizing image and object-space information is proposed. Firstly, four levels of image pyramids are generated according to the rule that the next pyramid level is generated from the previous level using the average gray values of the 3 by 3 pixels, and the first level of pyramid image is generated from the original image. The initial horizontal parallaxes between the reference image and each searching image are calculated at the highest level of the image pyramid. Secondly, corresponding image points are searched in each stereo image pair from the third level of image pyramid, and the matching results in all stereo pairs are integrated in the object space, by which the mismatched image points can be eliminated and more accurate spatial information can be obtained for the subsequent pyramid image matching. The matching method based on correlation coefficient with geometric constraints and global relaxation matching is introduced in the process of image matching. Finally, the feasibility of the method proposed in this paper is verified by the experiments using a set of digital frame aerial images with big overlap. Compared with the traditional image matching method with two images, the accuracy of the digital surface model (DSM) generated using the proposed method shows that the multiimage matching method can eliminate the mismatched points effectively and can improve the matching success rate significantly.展开更多
After myocardial infarction(MI),ventricular dilation and the microscopic passive stretching of the infarcted border zone is the meaning contributor to the continuous expansion of myocardial fibrosis.Epicardial hydroge...After myocardial infarction(MI),ventricular dilation and the microscopic passive stretching of the infarcted border zone is the meaning contributor to the continuous expansion of myocardial fibrosis.Epicardial hydrogel patches have been demonstrated to alleviate this sequela of MI in small-animal models.However,these have not been successfully translated to humans or even large animals,in part because of challenges in attaining both the greater stiffness and slower viscoelastic relaxation that mathematical models predict to be optimal for application to larger,slower-beating hearts.Here,using borate-based dynamic covalent chemistry,we develop an injectable“heart rate matched”viscoelastic gelatin(VGtn)hydrogel with a gel point tunable across the stiffnesses and frequencies that are predicted to transspecies and cross-scale cardiac repair after MI.Small-animal experiments demonstrated that,compared to heart rate mismatched patches,the heart rate matched VGtn patches inhibited ventricular bulging and attenuated stress concentrations in the myocardium after MI.In particular,the viscoelastic patch can coordinate the microscopic strain at the infarction boundary.VGtn loaded with anti-fibrotic agents further reduced myocardial damage and promoted angiogenesis in the myocardium.The tuned heart rate matched patches demonstrated similar benefits in a larger-scale and lower heart rate porcine MI model.Results suggest that heart rate matched VGtn patches may hold potential for clinical translation.展开更多
On April 2,2025,President Trump signed Executive Order 14257,announcing that starting April 5,2025,a 10%tariff would be imposed on all countries.For specific nations,higher“reciprocal tariffs”would take effect start...On April 2,2025,President Trump signed Executive Order 14257,announcing that starting April 5,2025,a 10%tariff would be imposed on all countries.For specific nations,higher“reciprocal tariffs”would take effect starting April 9.It is crucial to emphasize that“reciprocal”does not mean matching the tariff rates imposed by trading partners on the United States.展开更多
基金Supported by the National Natural Science Foundation of China(No.60802045)the Fundamental Research Funds for the Central Universities(No.2009JBM020)the Strategy Alliance of Chinese Academy of Sciences for Guangdong Province(No.2010B090301014)China
文摘This paper proposes an enhanced Edge Matching Rate (EMR) to gain good image regis-tration based on Generalized Acreage (GA). Traditional EMR considers only matched pixels sum without concerns of the cause of unmatched pixels and the relationship between matched pixels. The modified EMR introduces the new concept of generalized acreage to measure the overlaying parts between the target image and the model. It also defines similarity of local occlusion and of local dithering to measure interference degree. Not only edge points are considered but also non-edge points, occlusion, and dithering. Using the same preprocessing, the experiments match images based on tra-ditional EMR and the proposed EMR separately. Based on the proposed EMR the paper achieves more stable registration and higher precision.
基金Supported by the National Natural Science Foundation of China (Nos. 40771176, 40721001)
文摘A novel method for multi-image matching by synthesizing image and object-space information is proposed. Firstly, four levels of image pyramids are generated according to the rule that the next pyramid level is generated from the previous level using the average gray values of the 3 by 3 pixels, and the first level of pyramid image is generated from the original image. The initial horizontal parallaxes between the reference image and each searching image are calculated at the highest level of the image pyramid. Secondly, corresponding image points are searched in each stereo image pair from the third level of image pyramid, and the matching results in all stereo pairs are integrated in the object space, by which the mismatched image points can be eliminated and more accurate spatial information can be obtained for the subsequent pyramid image matching. The matching method based on correlation coefficient with geometric constraints and global relaxation matching is introduced in the process of image matching. Finally, the feasibility of the method proposed in this paper is verified by the experiments using a set of digital frame aerial images with big overlap. Compared with the traditional image matching method with two images, the accuracy of the digital surface model (DSM) generated using the proposed method shows that the multiimage matching method can eliminate the mismatched points effectively and can improve the matching success rate significantly.
基金supported by the National Natural Science Foundation of China(12402365,12225208,and U21A20337)the Young Talent Support Plan of Xi’an Jiaotong Universitythe Human Frontier Science Program(HFSP-RGP016/2024).
文摘After myocardial infarction(MI),ventricular dilation and the microscopic passive stretching of the infarcted border zone is the meaning contributor to the continuous expansion of myocardial fibrosis.Epicardial hydrogel patches have been demonstrated to alleviate this sequela of MI in small-animal models.However,these have not been successfully translated to humans or even large animals,in part because of challenges in attaining both the greater stiffness and slower viscoelastic relaxation that mathematical models predict to be optimal for application to larger,slower-beating hearts.Here,using borate-based dynamic covalent chemistry,we develop an injectable“heart rate matched”viscoelastic gelatin(VGtn)hydrogel with a gel point tunable across the stiffnesses and frequencies that are predicted to transspecies and cross-scale cardiac repair after MI.Small-animal experiments demonstrated that,compared to heart rate mismatched patches,the heart rate matched VGtn patches inhibited ventricular bulging and attenuated stress concentrations in the myocardium after MI.In particular,the viscoelastic patch can coordinate the microscopic strain at the infarction boundary.VGtn loaded with anti-fibrotic agents further reduced myocardial damage and promoted angiogenesis in the myocardium.The tuned heart rate matched patches demonstrated similar benefits in a larger-scale and lower heart rate porcine MI model.Results suggest that heart rate matched VGtn patches may hold potential for clinical translation.
文摘On April 2,2025,President Trump signed Executive Order 14257,announcing that starting April 5,2025,a 10%tariff would be imposed on all countries.For specific nations,higher“reciprocal tariffs”would take effect starting April 9.It is crucial to emphasize that“reciprocal”does not mean matching the tariff rates imposed by trading partners on the United States.
