Visual inspection of the key components of nuclear power plants(NPPs)is important for NPP operation and maintenance. However,the underwater environment and existing radiation will lead to image degradation,thus making...Visual inspection of the key components of nuclear power plants(NPPs)is important for NPP operation and maintenance. However,the underwater environment and existing radiation will lead to image degradation,thus making it difficult to identify surface defects. In this study,a method for improving the quality of underwater images is proposed.By analyzing the degradation characteristics of underwater detection image,the image enhancement technology is used to improve the color richness of the image,and then the improved dark channel prior(DCP)algorithm is used to restore it. By modifying the estimation formula of transmittance and background light,the correction of insufficient brightness in DCP restored image is realized. The proposed method is compared with other state-of-the-art methods. The results show that the proposed method can achieve higher scores and improve the image quality by correcting the color and restoring local details,thus effectively enhancing the reliability of visual inspection of NPPs.展开更多
Conjugated polyelectrolytes (CPEs),with electron-delocalized backbones and charged ionic side chains,are unique sensory materials for the construction of optical biosensors.In this feature article,CPE-based visual det...Conjugated polyelectrolytes (CPEs),with electron-delocalized backbones and charged ionic side chains,are unique sensory materials for the construction of optical biosensors.In this feature article,CPE-based visual detection of heparin is summarized.Three CPE-based heparin probes,including ratiometric,light-up and colormetric probes,are discussed in terms of molecular design,detection selectivity and quantification capability.The work summarized here provides fundamental guidelines for CPE-based label-free visual sensing.展开更多
基金supported by the National Natural Science Foundations of China (Nos. 51674031,51874022)。
文摘Visual inspection of the key components of nuclear power plants(NPPs)is important for NPP operation and maintenance. However,the underwater environment and existing radiation will lead to image degradation,thus making it difficult to identify surface defects. In this study,a method for improving the quality of underwater images is proposed.By analyzing the degradation characteristics of underwater detection image,the image enhancement technology is used to improve the color richness of the image,and then the improved dark channel prior(DCP)algorithm is used to restore it. By modifying the estimation formula of transmittance and background light,the correction of insufficient brightness in DCP restored image is realized. The proposed method is compared with other state-of-the-art methods. The results show that the proposed method can achieve higher scores and improve the image quality by correcting the color and restoring local details,thus effectively enhancing the reliability of visual inspection of NPPs.
基金the National University of Singapore (R279-000-301-646)Singapore Ministry of Education (R-279-000-255-112)Ministry of Defence (R-279-000-301-232) for financial support
文摘Conjugated polyelectrolytes (CPEs),with electron-delocalized backbones and charged ionic side chains,are unique sensory materials for the construction of optical biosensors.In this feature article,CPE-based visual detection of heparin is summarized.Three CPE-based heparin probes,including ratiometric,light-up and colormetric probes,are discussed in terms of molecular design,detection selectivity and quantification capability.The work summarized here provides fundamental guidelines for CPE-based label-free visual sensing.
