1 IntroductionThe screen content coding （SCC） standard [1] for high efficiency video coding （HEVC） is an international standard specially developed for screen content.
A screen content coding （SCC） algorithm that uses a primary reference buffer （PRB） and a secondary reference buffer （SRB） for string matching and string copying is proposed. PRB is typically the traditional reco...A screen content coding （SCC） algorithm that uses a primary reference buffer （PRB） and a secondary reference buffer （SRB） for string matching and string copying is proposed. PRB is typically the traditional reconstructed picture buffer which provides reference string pixels for the current pixels being coded. SRB stores a few of recently and frequently referenced pixels for repetitive reference by the current pixels being coded. In the encoder, searching of optimal reference string is performed in both PRB and SRB, and either a PRB or SRB string is selected as an optimal reference string on a string-by-string basis. Compared with HM-16.4＋SCM-40 reference software, the proposed SCC algorithm can improve coding performance measured by bit-distortion rate reduction of average 4.19% in all-intra configuration for text and graphics with motion category＇ of test sequences defined by JCT-VC common test condition.展开更多
The waxy(Wx)gene of rice encodes the granule-bound starch synthase(GBSS),which was required in the synthesis of amylose in endosperm.Theamylose content(AC)of rice endosperm played an important role in grain yield,pala...The waxy(Wx)gene of rice encodes the granule-bound starch synthase(GBSS),which was required in the synthesis of amylose in endosperm.Theamylose content(AC)of rice endosperm played an important role in grain yield,palatability,and processing quality.Our previous researehes showed that en-dosperm AC and GBSS contents were correlated with the ability of excising intron1 from the leader sequence of the Wx transcript.Cultivars with high endosperm展开更多
Objective:To prepare various crude extracts using different polarities of solvent and to quantitatively evaluate their total phenol,flavonoids contents and phytochemical screening of Thymus vulgaris collected from Al ...Objective:To prepare various crude extracts using different polarities of solvent and to quantitatively evaluate their total phenol,flavonoids contents and phytochemical screening of Thymus vulgaris collected from Al Jabal Al Akhdar,Nizwa.Sultanate of Oman.Methods:The leave sample was extracted with methanol and evaporated.Then it was defatted with water and extracted with different polarities organic solvents with increasing polarities.The prepare hexane,chloroform,ethyl acetate,hutanol and methanol crude extracts were used for their evaluation of total phenol,flavonoids contents and phytochemical screening study.The established conventional metliods were used for quantitative determination of total phenol,flavonoids contents and phytochemical screening.Results:Phytochemical screening for various crude extracts were tested and shown positive result for flavonoids,saponins and steroids compounds.The result for total phenol content was the highest in hutanol and the lowest in methanol crude extract whereas the total flavonoids contents was the highest in methanol and the lowest hexane crude extract.Conclusions:The crude extracts from locally grown Thymus vulgaris showed high concentration of flavonoids and it could be used as antibiotics for different curable and uncurable diseases.展开更多
AIM:To present a content-based image retrieval(CBIR) system that supports the classification of breast tissue density and can be used in the processing chain to adapt parameters for lesion segmentation and classificat...AIM:To present a content-based image retrieval(CBIR) system that supports the classification of breast tissue density and can be used in the processing chain to adapt parameters for lesion segmentation and classification.METHODS:Breast density is characterized by image texture using singular value decomposition(SVD) and histograms.Pattern similarity is computed by a support vector machine(SVM) to separate the four BI-RADS tissue categories.The crucial number of remaining singular values is varied(SVD),and linear,radial,and polynomial kernels are investigated(SVM).The system is supported by a large reference database for training and evaluation.Experiments are based on 5-fold cross validation.RESULTS:Adopted from DDSM,MIAS,LLNL,and RWTH datasets,the reference database is composed of over 10000 various mammograms with unified and reliable ground truth.An average precision of 82.14% is obtained using 25 singular values(SVD),polynomial kernel and the one-against-one(SVM).CONCLUSION:Breast density characterization using SVD allied with SVM for image retrieval enable the development of a CBIR system that can effectively aid radiologists in their diagnosis.展开更多
提出一种基于多任务注意力机制的无参考屏幕内容图像质量评价算法(multi-task attention mechanism based no reference quality assessment algorithm for screen content images,MTA-SCI)。MTA-SCI首先使用自注意力机制提取屏幕内容...提出一种基于多任务注意力机制的无参考屏幕内容图像质量评价算法(multi-task attention mechanism based no reference quality assessment algorithm for screen content images,MTA-SCI)。MTA-SCI首先使用自注意力机制提取屏幕内容图像的全局特征,增强对屏幕内容图像整体信息的表征能力;然后使用综合局部注意力机制提取屏幕内容图像的局部特征,使局部特征能够聚焦于屏幕内容图像中更吸引人注意的细节部分;最后使用双通道特征映射模块预测屏幕内容图像的质量分数。在SCID和SIQAD数据集上,MTA-SCI的斯皮尔曼秩序相关系数(Spearman's rank order correlation coefficient,SRCC)分别达到0.9602和0.9233,皮尔森线性相关系数(Pearson linear correlation coefficient,PLCC)分别达到0.9609和0.9294。实验结果表明,MTA-SCI在预测屏幕内容图像质量任务中具有较高的准确性。展开更多
Objective:Lipid droplet(LD)deposition in adipose tissue is a critical factor leading to metabolic dysfunction.Various herbal medicines in traditional Chinese medicine(TCM)are used to treat hyperlipidemia,type 2 diabet...Objective:Lipid droplet(LD)deposition in adipose tissue is a critical factor leading to metabolic dysfunction.Various herbal medicines in traditional Chinese medicine(TCM)are used to treat hyperlipidemia,type 2 diabetes,obesity,and other diseases.The objective of this study was to identify potential anti-adipogenic agents from TCM herbal compounds.Methods:One hundred and twenty compounds were evaluated in terms of their effect on adipocyte differentiation through image-based high content screening.Anti-adipogenic effects of identified hits were further confirmed at various concentrations.In addition,drug-induced liver injury assay was performed with HepG2 cells to test the hepatotoxicity of hit compounds.Results:Berbamine(BBM),a chemical isolated from barberry,and a derivative of BBM,berbamine dihydrochloride(BBMD),reduced LDs formation by more than 50%.Dose-dependent effects were observed and the IC50 values of the two hits,BBM and BBMD,were determined as 1.88 mM and 0.95 mM,respectively.Moreover,BBM induced mild HepG2 cell injury,while its dihydrochloridedBBMD did not exhibit hepatotoxicity within 40 mM.Conclusion:This study demonstrates that BBMD may be a potential therapeutic candidate for disorders associated with elevated LDs accumulation.展开更多
Objective:To assess antioxidant activities of different parts of Euphorbia hirta（E.hirta）,and to search for new sources of safe and inexpensive antioxidants.Methods:Samples of leaves,stems, flowers and roots from E....Objective:To assess antioxidant activities of different parts of Euphorbia hirta（E.hirta）,and to search for new sources of safe and inexpensive antioxidants.Methods:Samples of leaves,stems, flowers and roots from E.hirta were tested for total phenolic content,and flavonoids content and in vitro antioxidant activity by diphenyl-1-picrylhydrazyl（DPPH） assay and reducing power was measured using cyanoferrate method.Results:The leaves extract exhibited a maximum DPPH scavenging activity of（72.96±0.78）%followed by the flowers,roots and stems whose scavenging activities were（52.45±0.66）%,（48.59±0.97）%,and（44.42±0.94）%,respectively.The standard butylated hydroxytoluene（BHT） was（75.13±0.75）%.The IC<sub>50</sub>,for leaves,flowers,roots,stems and BHT were 0.803,0.972,0.989,1.358 and 0.794 mg/mL,respectively.The reducing power of the leaves extract was comparable with that of ascorbic acid and found to be dose dependent. Leaves extract had the highest total phenolic content[（206.17±1.95） mg GAE/g],followed by flowers,roots and stems extracts which were（117.08±3.10） mg GAE/g,（83.15±1.19） mg GAE/g,and （65.70±1.72） mg GAE/g,respectively.On the other hand,total flavonoids content also from leave had the highest value[（37.970±0.003） mg CEQ/g],followed by flowers,roots and stems extracts which were（35.200±0.002） mg CEQ/g,（24.350±0.006） mg CEQ/g,and（24.120±0.004） mg CEQ/ g,respectively.HPTLC bioautography analysis of phenolic and antioxidant substance revealed phenolic compounds.Phytochemical screening of E.hirta leaf extract revealed the presence of reducing sugars,terpenoids,alkaloids,steroids,tannins,flavanoids and phenolic compounds. Conclusions:These results suggeste that E.hirta have strong antioxidant potential.Further study is necessary for isolation and characterization of the active antioxidant agents,which can be used to treat various oxidative stress-related diseases.展开更多
基金supported in part by National Natural Science Foundation of China under Grant No.61201226 and 61271096Specialized Research Fund for the Doctoral Program under Grant No.20130072110054
文摘1 IntroductionThe screen content coding （SCC） standard [1] for high efficiency video coding （HEVC） is an international standard specially developed for screen content.
基金supported in part by National Natural Science Foundation of China under Grant No.61201226 and 61271096Natural Science Foundation of Shanghai under Grant No.12ZR1433800Specialized Research Fund for the Doctoral Program under Grant No.20130072110054
文摘A screen content coding （SCC） algorithm that uses a primary reference buffer （PRB） and a secondary reference buffer （SRB） for string matching and string copying is proposed. PRB is typically the traditional reconstructed picture buffer which provides reference string pixels for the current pixels being coded. SRB stores a few of recently and frequently referenced pixels for repetitive reference by the current pixels being coded. In the encoder, searching of optimal reference string is performed in both PRB and SRB, and either a PRB or SRB string is selected as an optimal reference string on a string-by-string basis. Compared with HM-16.4＋SCM-40 reference software, the proposed SCC algorithm can improve coding performance measured by bit-distortion rate reduction of average 4.19% in all-intra configuration for text and graphics with motion category＇ of test sequences defined by JCT-VC common test condition.
文摘The waxy(Wx)gene of rice encodes the granule-bound starch synthase(GBSS),which was required in the synthesis of amylose in endosperm.Theamylose content(AC)of rice endosperm played an important role in grain yield,palatability,and processing quality.Our previous researehes showed that en-dosperm AC and GBSS contents were correlated with the ability of excising intron1 from the leader sequence of the Wx transcript.Cultivars with high endosperm
基金Supported by Central Instrument Laboratory,College of Agriculture and Marine Sciences,Sultan Qaboos University,Sultanate of Oma(Grant No.507/SOP/OB/1/2013)
文摘Objective:To prepare various crude extracts using different polarities of solvent and to quantitatively evaluate their total phenol,flavonoids contents and phytochemical screening of Thymus vulgaris collected from Al Jabal Al Akhdar,Nizwa.Sultanate of Oman.Methods:The leave sample was extracted with methanol and evaporated.Then it was defatted with water and extracted with different polarities organic solvents with increasing polarities.The prepare hexane,chloroform,ethyl acetate,hutanol and methanol crude extracts were used for their evaluation of total phenol,flavonoids contents and phytochemical screening study.The established conventional metliods were used for quantitative determination of total phenol,flavonoids contents and phytochemical screening.Results:Phytochemical screening for various crude extracts were tested and shown positive result for flavonoids,saponins and steroids compounds.The result for total phenol content was the highest in hutanol and the lowest in methanol crude extract whereas the total flavonoids contents was the highest in methanol and the lowest hexane crude extract.Conclusions:The crude extracts from locally grown Thymus vulgaris showed high concentration of flavonoids and it could be used as antibiotics for different curable and uncurable diseases.
基金Supported by CNPq-Brazil,Grants 306193/2007-8,471518/ 2007-7,307373/2006-1 and 484893/2007-6,by FAPEMIG,Grant PPM 347/08,and by CAPESThe IRMA project is funded by the German Research Foundation(DFG),Le 1108/4 and Le 1108/9
文摘AIM:To present a content-based image retrieval(CBIR) system that supports the classification of breast tissue density and can be used in the processing chain to adapt parameters for lesion segmentation and classification.METHODS:Breast density is characterized by image texture using singular value decomposition(SVD) and histograms.Pattern similarity is computed by a support vector machine(SVM) to separate the four BI-RADS tissue categories.The crucial number of remaining singular values is varied(SVD),and linear,radial,and polynomial kernels are investigated(SVM).The system is supported by a large reference database for training and evaluation.Experiments are based on 5-fold cross validation.RESULTS:Adopted from DDSM,MIAS,LLNL,and RWTH datasets,the reference database is composed of over 10000 various mammograms with unified and reliable ground truth.An average precision of 82.14% is obtained using 25 singular values(SVD),polynomial kernel and the one-against-one(SVM).CONCLUSION:Breast density characterization using SVD allied with SVM for image retrieval enable the development of a CBIR system that can effectively aid radiologists in their diagnosis.
文摘提出一种基于多任务注意力机制的无参考屏幕内容图像质量评价算法(multi-task attention mechanism based no reference quality assessment algorithm for screen content images,MTA-SCI)。MTA-SCI首先使用自注意力机制提取屏幕内容图像的全局特征,增强对屏幕内容图像整体信息的表征能力;然后使用综合局部注意力机制提取屏幕内容图像的局部特征,使局部特征能够聚焦于屏幕内容图像中更吸引人注意的细节部分;最后使用双通道特征映射模块预测屏幕内容图像的质量分数。在SCID和SIQAD数据集上,MTA-SCI的斯皮尔曼秩序相关系数(Spearman's rank order correlation coefficient,SRCC)分别达到0.9602和0.9233,皮尔森线性相关系数(Pearson linear correlation coefficient,PLCC)分别达到0.9609和0.9294。实验结果表明,MTA-SCI在预测屏幕内容图像质量任务中具有较高的准确性。
基金This work was supported by a grant from the National Natural Science Foundation of China(grant number 81430094).
文摘Objective:Lipid droplet(LD)deposition in adipose tissue is a critical factor leading to metabolic dysfunction.Various herbal medicines in traditional Chinese medicine(TCM)are used to treat hyperlipidemia,type 2 diabetes,obesity,and other diseases.The objective of this study was to identify potential anti-adipogenic agents from TCM herbal compounds.Methods:One hundred and twenty compounds were evaluated in terms of their effect on adipocyte differentiation through image-based high content screening.Anti-adipogenic effects of identified hits were further confirmed at various concentrations.In addition,drug-induced liver injury assay was performed with HepG2 cells to test the hepatotoxicity of hit compounds.Results:Berbamine(BBM),a chemical isolated from barberry,and a derivative of BBM,berbamine dihydrochloride(BBMD),reduced LDs formation by more than 50%.Dose-dependent effects were observed and the IC50 values of the two hits,BBM and BBMD,were determined as 1.88 mM and 0.95 mM,respectively.Moreover,BBM induced mild HepG2 cell injury,while its dihydrochloridedBBMD did not exhibit hepatotoxicity within 40 mM.Conclusion:This study demonstrates that BBMD may be a potential therapeutic candidate for disorders associated with elevated LDs accumulation.
基金Islamic Development Bank for the financial support with a master degree scholarship
文摘Objective:To assess antioxidant activities of different parts of Euphorbia hirta（E.hirta）,and to search for new sources of safe and inexpensive antioxidants.Methods:Samples of leaves,stems, flowers and roots from E.hirta were tested for total phenolic content,and flavonoids content and in vitro antioxidant activity by diphenyl-1-picrylhydrazyl（DPPH） assay and reducing power was measured using cyanoferrate method.Results:The leaves extract exhibited a maximum DPPH scavenging activity of（72.96±0.78）%followed by the flowers,roots and stems whose scavenging activities were（52.45±0.66）%,（48.59±0.97）%,and（44.42±0.94）%,respectively.The standard butylated hydroxytoluene（BHT） was（75.13±0.75）%.The IC<sub>50</sub>,for leaves,flowers,roots,stems and BHT were 0.803,0.972,0.989,1.358 and 0.794 mg/mL,respectively.The reducing power of the leaves extract was comparable with that of ascorbic acid and found to be dose dependent. Leaves extract had the highest total phenolic content[（206.17±1.95） mg GAE/g],followed by flowers,roots and stems extracts which were（117.08±3.10） mg GAE/g,（83.15±1.19） mg GAE/g,and （65.70±1.72） mg GAE/g,respectively.On the other hand,total flavonoids content also from leave had the highest value[（37.970±0.003） mg CEQ/g],followed by flowers,roots and stems extracts which were（35.200±0.002） mg CEQ/g,（24.350±0.006） mg CEQ/g,and（24.120±0.004） mg CEQ/ g,respectively.HPTLC bioautography analysis of phenolic and antioxidant substance revealed phenolic compounds.Phytochemical screening of E.hirta leaf extract revealed the presence of reducing sugars,terpenoids,alkaloids,steroids,tannins,flavanoids and phenolic compounds. Conclusions:These results suggeste that E.hirta have strong antioxidant potential.Further study is necessary for isolation and characterization of the active antioxidant agents,which can be used to treat various oxidative stress-related diseases.
