IHS (Intensity, Hue and Saturation) transform is one of the most commonly used tusion algonthm. But the matching error causes spectral distortion and degradation in processing of image fusion with IHS method. A stud...IHS (Intensity, Hue and Saturation) transform is one of the most commonly used tusion algonthm. But the matching error causes spectral distortion and degradation in processing of image fusion with IHS method. A study on IHS fusion indicates that the color distortion can't be avoided. Meanwhile, the statistical property of wavelet coefficient with wavelet decomposition reflects those significant features, such as edges, lines and regions. So, a united optimal fusion method, which uses the statistical property and IHS transform on pixel and feature levels, is proposed. That is, the high frequency of intensity component Ⅰ is fused on feature level with multi-resolution wavelet in IHS space. And the low frequency of intensity component Ⅰ is fused on pixel level with optimal weight coefficients. Spectral information and spatial resolution are two performance indexes of optimal weight coefficients. Experiment results with QuickBird data of Shanghai show that it is a practical and effective method.展开更多
In the present paper, a method is proposed to improve the performance of Artificial Neural Network (ANN) based algorithms for the retrieval of oceanic constituents in Case Ⅱ waters. The ANN-based algorithms have been...In the present paper, a method is proposed to improve the performance of Artificial Neural Network (ANN) based algorithms for the retrieval of oceanic constituents in Case Ⅱ waters. The ANN-based algorithms have been developed based on a constraint condition, which represents, to a certain degree, the correlation between suspended particulate matter (SPM) and pigment (CHL), coloured dissolved organic matter (CDOM) and CHL, as well as CDOM and SPM, found in Case Ⅱ waters. Compared with the ANN-based algorithm developed without a constraint condition, the performance of ANN-based algorithms developed with a constraint conditions is much better for the retrieval of CHL and CDOM, especially in the case of high noise levels; however, there is not significant improvement for the retrieval of SPM.展开更多
The conventional photoelectric detection system requires complex circuitry and spectroscopic systems as well as specialized personnel for its operation.To replace such a system,a method of measuring turbidity using a ...The conventional photoelectric detection system requires complex circuitry and spectroscopic systems as well as specialized personnel for its operation.To replace such a system,a method of measuring turbidity using a camera is proposed by combining the imaging characteristics of a digital camera and the high-speed information processing capability of a computer.Two turbidity measurement devices based on visible and near-infrared(NIR)light cameras and a light source driving circuit with constant light intensity were designed.The RGB data in the turbidity images were acquired using a self-developed image processing software and converted to the CIE Lab color space.Based on the relationship between the luminance,chromatic aberration,and turbidity,the turbidity detection models for luminance and chromatic aberration of visible and NIR light devices exhibiting values from 0-1000 NTU,less than 100 NTU,and more than 100 NTU were established.By comparing and analyzing the proposed models,the two measurement models with the best all-around performance were selected and fused to generate new measurement models.The experimental results prove that the correlation between the three models and the commercial turbidity meter measurements exhibite a significance value higher than 0.999.The error of the fusion model is within 1.05%,with a mean square error of 1.14.The visible light device has less error at low turbidity measurements and is less influenced by the color of the image.The NIR light device is more stable and accurate at full range and high turbidity measurements and is therefore more suitable for such measurements.展开更多
Jingdezhen is a bright star to make ceramic products among all cities of the world. The actual inheritance of the famille rose decoration and color enamel craftsmanship as China's "intangible cultural heritage" is ...Jingdezhen is a bright star to make ceramic products among all cities of the world. The actual inheritance of the famille rose decoration and color enamel craftsmanship as China's "intangible cultural heritage" is restricted not only by historical change and geographical conditions and also by how to inherit the craftsmanship. In this paper, through the literature studies, sociology investigation, market research, and comparative analysis of the traditional pastel industry in Jingdezhen, the making flows of famille rose decoration and color enamel are introduced plus the author's understanding of famille rose decoration and color enamel, and also the understanding and inheritance of Jingdezhen traditional famille rose decoration and color enamel craftsmanship as "intangible cultural heritage" are discussed. Therefore, theoretical basis and practice guidance are provided for famille rose decoration and color enamel craftsmanship to develop toward the cultural industry, and also a reference in theory and practice is available for the inheritance and development of the handmade ceramic products as "intangible cultural heritage".展开更多
To evaluate the light field display system with a liquid crystal display(LCD) and a holographic functional screen(HFS),the voxel theory based on the ray tracing is used.By analyzing the voxels defined by the cases of ...To evaluate the light field display system with a liquid crystal display(LCD) and a holographic functional screen(HFS),the voxel theory based on the ray tracing is used.By analyzing the voxels defined by the cases of corresponding pixels overlapping completely and partially in the image space,the resolution characteristics of the system are discussed.The theoretical model is verified in the reconstruction experiment of a resolution target and compared with the calculation result of the presented system.Finally,we give an optimization method for the display image quality.展开更多
基金Supported by the High Technology Research and Development Programme of China (2001AA135091) and the National Natural Science Foundation of China (60375008).
文摘IHS (Intensity, Hue and Saturation) transform is one of the most commonly used tusion algonthm. But the matching error causes spectral distortion and degradation in processing of image fusion with IHS method. A study on IHS fusion indicates that the color distortion can't be avoided. Meanwhile, the statistical property of wavelet coefficient with wavelet decomposition reflects those significant features, such as edges, lines and regions. So, a united optimal fusion method, which uses the statistical property and IHS transform on pixel and feature levels, is proposed. That is, the high frequency of intensity component Ⅰ is fused on feature level with multi-resolution wavelet in IHS space. And the low frequency of intensity component Ⅰ is fused on pixel level with optimal weight coefficients. Spectral information and spatial resolution are two performance indexes of optimal weight coefficients. Experiment results with QuickBird data of Shanghai show that it is a practical and effective method.
文摘In the present paper, a method is proposed to improve the performance of Artificial Neural Network (ANN) based algorithms for the retrieval of oceanic constituents in Case Ⅱ waters. The ANN-based algorithms have been developed based on a constraint condition, which represents, to a certain degree, the correlation between suspended particulate matter (SPM) and pigment (CHL), coloured dissolved organic matter (CDOM) and CHL, as well as CDOM and SPM, found in Case Ⅱ waters. Compared with the ANN-based algorithm developed without a constraint condition, the performance of ANN-based algorithms developed with a constraint conditions is much better for the retrieval of CHL and CDOM, especially in the case of high noise levels; however, there is not significant improvement for the retrieval of SPM.
基金National Natural Science Foundation of China(No.61671434)Key Projects of Provincial Natural Science Foundation of Anhui Universities(Nos.KJ2019A0952,KJ2017ZD32)。
文摘The conventional photoelectric detection system requires complex circuitry and spectroscopic systems as well as specialized personnel for its operation.To replace such a system,a method of measuring turbidity using a camera is proposed by combining the imaging characteristics of a digital camera and the high-speed information processing capability of a computer.Two turbidity measurement devices based on visible and near-infrared(NIR)light cameras and a light source driving circuit with constant light intensity were designed.The RGB data in the turbidity images were acquired using a self-developed image processing software and converted to the CIE Lab color space.Based on the relationship between the luminance,chromatic aberration,and turbidity,the turbidity detection models for luminance and chromatic aberration of visible and NIR light devices exhibiting values from 0-1000 NTU,less than 100 NTU,and more than 100 NTU were established.By comparing and analyzing the proposed models,the two measurement models with the best all-around performance were selected and fused to generate new measurement models.The experimental results prove that the correlation between the three models and the commercial turbidity meter measurements exhibite a significance value higher than 0.999.The error of the fusion model is within 1.05%,with a mean square error of 1.14.The visible light device has less error at low turbidity measurements and is less influenced by the color of the image.The NIR light device is more stable and accurate at full range and high turbidity measurements and is therefore more suitable for such measurements.
文摘Jingdezhen is a bright star to make ceramic products among all cities of the world. The actual inheritance of the famille rose decoration and color enamel craftsmanship as China's "intangible cultural heritage" is restricted not only by historical change and geographical conditions and also by how to inherit the craftsmanship. In this paper, through the literature studies, sociology investigation, market research, and comparative analysis of the traditional pastel industry in Jingdezhen, the making flows of famille rose decoration and color enamel are introduced plus the author's understanding of famille rose decoration and color enamel, and also the understanding and inheritance of Jingdezhen traditional famille rose decoration and color enamel craftsmanship as "intangible cultural heritage" are discussed. Therefore, theoretical basis and practice guidance are provided for famille rose decoration and color enamel craftsmanship to develop toward the cultural industry, and also a reference in theory and practice is available for the inheritance and development of the handmade ceramic products as "intangible cultural heritage".
基金supported by the National High Technology Research and Development Program of China(Nos.2012AA011902 and 2015AA015902)the National Natural Science Foundation of China(No.61177018)+1 种基金the State Key Laboratory of Information Photonics and Optical Communicationsthe Program of Beijng Science and Technology Plan(No.D121100004812001)
文摘To evaluate the light field display system with a liquid crystal display(LCD) and a holographic functional screen(HFS),the voxel theory based on the ray tracing is used.By analyzing the voxels defined by the cases of corresponding pixels overlapping completely and partially in the image space,the resolution characteristics of the system are discussed.The theoretical model is verified in the reconstruction experiment of a resolution target and compared with the calculation result of the presented system.Finally,we give an optimization method for the display image quality.