Flower image retrieval is a very important step for computer-aided plant species recognition. In this paper, we propose an efficient segmentation method based on color clustering and domain knowledge to extract flower...Flower image retrieval is a very important step for computer-aided plant species recognition. In this paper, we propose an efficient segmentation method based on color clustering and domain knowledge to extract flower regions from flower images. For flower retrieval, we use the color histogram of a flower region to characterize the color features of flower and two shape-based features sets, Centroid-Contour Distance (CCD) and Angle Code Histogram (ACH), to characterize the shape features of a flower contour. Experimental results showed that our flower region extraction method based on color clustering and domain knowledge can produce accurate flower regions. Flower retrieval results on a database of 885 flower images collected from 14 plant species showed that our Region-of-Interest (ROI) based retrieval approach using both color and shape features can perform better than a method based on the global color histogram proposed by Swain and Ballard (1991) and a method based on domain knowledge-driven segmentation and color names proposed by Das et al.(1999).展开更多
As the typical representative of love and marriage drama in Yuan variety play,Qiuhu philander his wife plays a relatively important role in it.This paper carries on the analysis in a few typical character image,which ...As the typical representative of love and marriage drama in Yuan variety play,Qiuhu philander his wife plays a relatively important role in it.This paper carries on the analysis in a few typical character image,which are Luo Meiying who has the courage to fight,the hypocritical and insidious Qiu Hu,the ugly and vicious Li Dahu,the greedy and hard-hearted Luo Dahu,the kind and helpless mother-in-law Mei Ying,these five different images apparently jumping on the paper.展开更多
An optical imaging system and a configuration characteristic algorithm are presented to reduce the difficulties in extracting intact characters image with weak contrast, in recognizing characters on fast moving beer b...An optical imaging system and a configuration characteristic algorithm are presented to reduce the difficulties in extracting intact characters image with weak contrast, in recognizing characters on fast moving beer bottles. The system consists of a hardware subsystem, including a rotating device, CCD, 16 mm focus lens, a frame grabber card, a penetrating lighting and a computer, and a software subsystem. The software subsystem performs pretreatment, character segmentation and character recognition. In the pretreatment, the original image is filtered with preset threshold to remove isolated spots. Then the horizontal projection and the vertical projection are used respectively to retrieve the character segmentation. Subsequently, the configuration characteristic algorithm is applied to recognize the characters. The experimental results demonstrate that this system can recognize the characters on beer bottles accurately and effectively; the algorithm is proven fast, stable and robust, making it suitable in the industrial environment.展开更多
The paper focuses on Wu Zetian,the only empress in China’s history,and her relationship with Buddhism.This study focuses on the book Zizhi Tongjian and compares the differences in the portrayal of Wu Zetian’s connec...The paper focuses on Wu Zetian,the only empress in China’s history,and her relationship with Buddhism.This study focuses on the book Zizhi Tongjian and compares the differences in the portrayal of Wu Zetian’s connection with Buddhism with the ancient texts of the Old Tang Book and the New Tang Book.It uses historical contextualism to analyze the epochal implications of these differences in the Northern Song Dynasty.Additionally,the paper discusses how historians downplayed or marginalized Wu Zetian’s achievements while emphasizing the negative aspects of her reign.Notably,historian Sima Guang,who was influenced by Confucianism and his own political situation,produced a biased description of Wu Zetian and the Buddhism which she promoted during her reign.展开更多
He jerks up,gasping for air,the back of his shirt soaked with cold sweat.Not again.He turns his head to the side,to his wife who lies sound asleep next to him.Even as an alumnus of Peking University,the top university...He jerks up,gasping for air,the back of his shirt soaked with cold sweat.Not again.He turns his head to the side,to his wife who lies sound asleep next to him.Even as an alumnus of Peking University,the top university in China,my forty six year-old father still suffers from nightmares about the Gaokao(also known as NCEE,or the National College Entrance Examination).Gaokao is the graduation exam administered to millions of high school seniors in China each year.While some students avoid this test by studying abroad,students who plan to attend universities in China have no choice but to prepare for the NCEE.Even though it is terribly grueling to study for and take the NCEE,most Chinese students see the test as their sole path to future success.展开更多
The Old Man and the Seais the representative work of the famous American writer Hemingway.It tells the adventure experience of an old Cuban fisherman fishing and fighting with nature.It has created a unique image of S...The Old Man and the Seais the representative work of the famous American writer Hemingway.It tells the adventure experience of an old Cuban fisherman fishing and fighting with nature.It has created a unique image of San Diego,contains profound philosophical thoughts and humanistic spirit,and is an important content of literary research.This article analyzes the characters in The Old Man and the Sea,hoping to deepen the understanding of this work.展开更多
Microwave chips are widely utilized in modern communication,national defense,and various technological domains.However,effective signal identification remains challenging due to complex multi-frequency microwave inter...Microwave chips are widely utilized in modern communication,national defense,and various technological domains.However,effective signal identification remains challenging due to complex multi-frequency microwave interference.To address this issue,we propose an advanced optical imaging framework based on nitrogen-vacancy(NV)center near-field microscopy.This framework enables the separation and imaging characterization of mixed multi-frequency microwave signals across a wide field of view(2000μm×1600μm,spatial resolution of 5μm)on chip surfaces.By leveraging the NV color center as a mixer,combined with a multi-frequency hybrid model and fast Fourier transform(FFT)analysis,we convert the invisible electromagnetic waves into visible optical information.Using a wide-field microscopy system equipped with a high-speed optical camera,our approach effectively enables the separation and imaging of mixed microwave signals across two complex scenarios.Comparative analysis with finite element simulation validates the accuracy of this approach.Experimental results reveal m Hz frequency resolution for GHz microwaves andμT-level signal intensity resolution,showcasing its superior capability for imaging mixed signals with multi-frequency.These findings provide critical technical support for microwave chip characterization,interference signal identification,and diagnostic testing,highlighting the broad applicability of this technique.展开更多
An on-line full scan inspection system is developed for particle size analysis. A particle image is first obtained through optical line scan technology and is then analyzed using digital image processing. The system i...An on-line full scan inspection system is developed for particle size analysis. A particle image is first obtained through optical line scan technology and is then analyzed using digital image processing. The system is composed of a particle separation module, an image acquisition module, an image processing module, and an electric control module. Experiments are carried out using non-uniform 0.1 mm particles. The main advantage of this system consists of a full analysis of particles without any overlap or miss, thus improving the Area Scan Charge Coupled Device （CCD） acquisition problems. Particle size distribution, roundness, and sphericity can be obtained using the system with a deviation of repeated precision of around ±1%. The developed system is shown to be also convenient and versatile for any particle size and shape for academic and industrial users.展开更多
基金Project (Nos. 60302012 60202002) supported by the NationaNatural Science Foundation of China and the Research GrantCouncil of the Hong Kong Special Administrative Region (NoPolyU 5119.01E) China
文摘Flower image retrieval is a very important step for computer-aided plant species recognition. In this paper, we propose an efficient segmentation method based on color clustering and domain knowledge to extract flower regions from flower images. For flower retrieval, we use the color histogram of a flower region to characterize the color features of flower and two shape-based features sets, Centroid-Contour Distance (CCD) and Angle Code Histogram (ACH), to characterize the shape features of a flower contour. Experimental results showed that our flower region extraction method based on color clustering and domain knowledge can produce accurate flower regions. Flower retrieval results on a database of 885 flower images collected from 14 plant species showed that our Region-of-Interest (ROI) based retrieval approach using both color and shape features can perform better than a method based on the global color histogram proposed by Swain and Ballard (1991) and a method based on domain knowledge-driven segmentation and color names proposed by Das et al.(1999).
文摘As the typical representative of love and marriage drama in Yuan variety play,Qiuhu philander his wife plays a relatively important role in it.This paper carries on the analysis in a few typical character image,which are Luo Meiying who has the courage to fight,the hypocritical and insidious Qiu Hu,the ugly and vicious Li Dahu,the greedy and hard-hearted Luo Dahu,the kind and helpless mother-in-law Mei Ying,these five different images apparently jumping on the paper.
基金This project is supported by Municipal Science Foundation of Wuhan(No.T20001101005).
文摘An optical imaging system and a configuration characteristic algorithm are presented to reduce the difficulties in extracting intact characters image with weak contrast, in recognizing characters on fast moving beer bottles. The system consists of a hardware subsystem, including a rotating device, CCD, 16 mm focus lens, a frame grabber card, a penetrating lighting and a computer, and a software subsystem. The software subsystem performs pretreatment, character segmentation and character recognition. In the pretreatment, the original image is filtered with preset threshold to remove isolated spots. Then the horizontal projection and the vertical projection are used respectively to retrieve the character segmentation. Subsequently, the configuration characteristic algorithm is applied to recognize the characters. The experimental results demonstrate that this system can recognize the characters on beer bottles accurately and effectively; the algorithm is proven fast, stable and robust, making it suitable in the industrial environment.
文摘The paper focuses on Wu Zetian,the only empress in China’s history,and her relationship with Buddhism.This study focuses on the book Zizhi Tongjian and compares the differences in the portrayal of Wu Zetian’s connection with Buddhism with the ancient texts of the Old Tang Book and the New Tang Book.It uses historical contextualism to analyze the epochal implications of these differences in the Northern Song Dynasty.Additionally,the paper discusses how historians downplayed or marginalized Wu Zetian’s achievements while emphasizing the negative aspects of her reign.Notably,historian Sima Guang,who was influenced by Confucianism and his own political situation,produced a biased description of Wu Zetian and the Buddhism which she promoted during her reign.
文摘He jerks up,gasping for air,the back of his shirt soaked with cold sweat.Not again.He turns his head to the side,to his wife who lies sound asleep next to him.Even as an alumnus of Peking University,the top university in China,my forty six year-old father still suffers from nightmares about the Gaokao(also known as NCEE,or the National College Entrance Examination).Gaokao is the graduation exam administered to millions of high school seniors in China each year.While some students avoid this test by studying abroad,students who plan to attend universities in China have no choice but to prepare for the NCEE.Even though it is terribly grueling to study for and take the NCEE,most Chinese students see the test as their sole path to future success.
文摘The Old Man and the Seais the representative work of the famous American writer Hemingway.It tells the adventure experience of an old Cuban fisherman fishing and fighting with nature.It has created a unique image of San Diego,contains profound philosophical thoughts and humanistic spirit,and is an important content of literary research.This article analyzes the characters in The Old Man and the Sea,hoping to deepen the understanding of this work.
基金National Natural Science Foundation of China(52435011,51821003,62175219,62103385)。
文摘Microwave chips are widely utilized in modern communication,national defense,and various technological domains.However,effective signal identification remains challenging due to complex multi-frequency microwave interference.To address this issue,we propose an advanced optical imaging framework based on nitrogen-vacancy(NV)center near-field microscopy.This framework enables the separation and imaging characterization of mixed multi-frequency microwave signals across a wide field of view(2000μm×1600μm,spatial resolution of 5μm)on chip surfaces.By leveraging the NV color center as a mixer,combined with a multi-frequency hybrid model and fast Fourier transform(FFT)analysis,we convert the invisible electromagnetic waves into visible optical information.Using a wide-field microscopy system equipped with a high-speed optical camera,our approach effectively enables the separation and imaging of mixed microwave signals across two complex scenarios.Comparative analysis with finite element simulation validates the accuracy of this approach.Experimental results reveal m Hz frequency resolution for GHz microwaves andμT-level signal intensity resolution,showcasing its superior capability for imaging mixed signals with multi-frequency.These findings provide critical technical support for microwave chip characterization,interference signal identification,and diagnostic testing,highlighting the broad applicability of this technique.
文摘An on-line full scan inspection system is developed for particle size analysis. A particle image is first obtained through optical line scan technology and is then analyzed using digital image processing. The system is composed of a particle separation module, an image acquisition module, an image processing module, and an electric control module. Experiments are carried out using non-uniform 0.1 mm particles. The main advantage of this system consists of a full analysis of particles without any overlap or miss, thus improving the Area Scan Charge Coupled Device （CCD） acquisition problems. Particle size distribution, roundness, and sphericity can be obtained using the system with a deviation of repeated precision of around ±1%. The developed system is shown to be also convenient and versatile for any particle size and shape for academic and industrial users.
