A new method based on gray-natural logarithm ratio bilateral filtering is presented for image smoothing in this work. A new gray-natural logarithm ratio range filter kernel, leading to adaptive magnitude from image gr...A new method based on gray-natural logarithm ratio bilateral filtering is presented for image smoothing in this work. A new gray-natural logarithm ratio range filter kernel, leading to adaptive magnitude from image gray distinction information, is pointed out for the bilateral filtering. The new method can not only well restrain noise but also keep much more weak edges and details of an image, and preserve the original color transition of color images. Experimental results show the effectiveness for image denoising with our method.展开更多
This Letter gives the general construction of an enhanced self-heterodyne synthetic aperture imaging ladar(SAIL) system, and proposes the principle of image processing. A point target is reconstructed in the enhance...This Letter gives the general construction of an enhanced self-heterodyne synthetic aperture imaging ladar(SAIL) system, and proposes the principle of image processing. A point target is reconstructed in the enhanced self-heterodyne SAIL as well as in down-looking SAIL experiments, and the achieved imaging resolution of the enhanced self-heterodyne SAIL is analyzed. The signal-to-noise ratio(SNR) of the point target final image in the enhanced self-heterodyne SAIL is higher than that in the down-looking SAIL. The enhanced self-heterodyne SAIL can improve the SNR of the target image in far-distance imaging, with practicality.展开更多
This Letter presents a simple and effective method to improve the signal-to-noise ratio(SNR) of compressing imaging. The main principles of the proposed method are the correlation of the image signals and the random...This Letter presents a simple and effective method to improve the signal-to-noise ratio(SNR) of compressing imaging. The main principles of the proposed method are the correlation of the image signals and the randomness of the noise. Multiple low SNR images are reconstructed firstly by the compressed sensing reconstruction algorithm, and then two-dimensional time delay integration technology is adopted to improve the SNR. Results show that the proposed method can improve the SNR performance efficiently and it is easy to apply the a lgorithm to the real project.展开更多
Here we propose a fluorescent sensor,Chroma-V,consisted of a Hoechst ligand(Hoe) to target chromatin DNA and a BODIPY rotor(BDP) to sense the local viscosity that reflects chromatin condensation state.Within Chroma-V,...Here we propose a fluorescent sensor,Chroma-V,consisted of a Hoechst ligand(Hoe) to target chromatin DNA and a BODIPY rotor(BDP) to sense the local viscosity that reflects chromatin condensation state.Within Chroma-V,efficient FRET process from Hoe to BDP facilitated a single-excitation ratiometric imaging of nucleus DNA under fluorescence confocal microscope,which utilized the ratio of two channels to enable an intuitive visualization of chromatin condensation state.And fluorescence lifetime imaging(FLIM) based on fluorescent signal from BDP proved to be a more accurate method to quantify the changes of chromatin condensation state under different epigenetic states,including histone acetylation regulated by deacetylase inhibitors,cell apoptosis induced by DNA-bining drugs,and the epithelialmesenchymal transition of HUVEC cells induced by TGF-β.展开更多
基金the National Natural Science Foundation of China under Grant No.60778046.
文摘A new method based on gray-natural logarithm ratio bilateral filtering is presented for image smoothing in this work. A new gray-natural logarithm ratio range filter kernel, leading to adaptive magnitude from image gray distinction information, is pointed out for the bilateral filtering. The new method can not only well restrain noise but also keep much more weak edges and details of an image, and preserve the original color transition of color images. Experimental results show the effectiveness for image denoising with our method.
基金supported by the National Natural Science Foundation of China(Nos.61605226 and 61505233)the Key Laboratory of Space Laser Communication and Detection Technology of Chinese Academy of Sciences
文摘This Letter gives the general construction of an enhanced self-heterodyne synthetic aperture imaging ladar(SAIL) system, and proposes the principle of image processing. A point target is reconstructed in the enhanced self-heterodyne SAIL as well as in down-looking SAIL experiments, and the achieved imaging resolution of the enhanced self-heterodyne SAIL is analyzed. The signal-to-noise ratio(SNR) of the point target final image in the enhanced self-heterodyne SAIL is higher than that in the down-looking SAIL. The enhanced self-heterodyne SAIL can improve the SNR of the target image in far-distance imaging, with practicality.
基金supported by the National Natural Science Foundation of China(No.11503010)the Fundamental Research Funds for the Central Universities(No.30916015103)
文摘This Letter presents a simple and effective method to improve the signal-to-noise ratio(SNR) of compressing imaging. The main principles of the proposed method are the correlation of the image signals and the randomness of the noise. Multiple low SNR images are reconstructed firstly by the compressed sensing reconstruction algorithm, and then two-dimensional time delay integration technology is adopted to improve the SNR. Results show that the proposed method can improve the SNR performance efficiently and it is easy to apply the a lgorithm to the real project.
基金supported by the National Natural Science Foundation of China (Nos.21421005,21576040,21776037,21901031 and 22078047)Science and Technology Foundation of Liaoning Province (No.2020-YQ-08)+1 种基金Dalian Science and Technology Innovation Fund (No.2020JJ25CY014)the Fundamental Research Funds for the Central Universities (Nos.DUT18RC(3)027 and DUT20RC(5)024)。
文摘Here we propose a fluorescent sensor,Chroma-V,consisted of a Hoechst ligand(Hoe) to target chromatin DNA and a BODIPY rotor(BDP) to sense the local viscosity that reflects chromatin condensation state.Within Chroma-V,efficient FRET process from Hoe to BDP facilitated a single-excitation ratiometric imaging of nucleus DNA under fluorescence confocal microscope,which utilized the ratio of two channels to enable an intuitive visualization of chromatin condensation state.And fluorescence lifetime imaging(FLIM) based on fluorescent signal from BDP proved to be a more accurate method to quantify the changes of chromatin condensation state under different epigenetic states,including histone acetylation regulated by deacetylase inhibitors,cell apoptosis induced by DNA-bining drugs,and the epithelialmesenchymal transition of HUVEC cells induced by TGF-β.