Special skills are required in portrait painting, such as imagining geometric structures and facial detail for final portrait designs. This makes it a difficult task for users, especially novices without prior artisti...Special skills are required in portrait painting, such as imagining geometric structures and facial detail for final portrait designs. This makes it a difficult task for users, especially novices without prior artistic training, to draw freehand portraits with high-quality details. In this paper, we propose dualFace, a portrait drawing interface to assist users with different levels of drawing skills to complete recognizable and authentic face sketches. Inspired by traditional artist workflows for portrait drawing, dualFace gives two-stages of drawing assistance to provide global and local visual guidance. The former helps users draw contour lines for portraits (i.e., geometric structure), and the latter helps users draw details of facial parts, which conform to the user-drawn contour lines. In the global guidance stage, the user draws several contour lines, and dualFace then searches for several relevant images from an internal database and displays the suggested face contour lines on the background of the canvas. In the local guidance stage, we synthesize detailed portrait images with a deep generative model from user-drawn contour lines, and then use the synthesized results as detailed drawing guidance. We conducted a user study to verify the effectiveness of dualFace, which confirms that dualFace significantly helps users to produce a detailed portrait sketch.展开更多
Short videos shot at a nursing home in the northern Chinese city of Tianjin are aimed at enriching the inner world of its elderly residents and maintaining their optimistic life view.Agroup of senior citizens face the...Short videos shot at a nursing home in the northern Chinese city of Tianjin are aimed at enriching the inner world of its elderly residents and maintaining their optimistic life view.Agroup of senior citizens face the camera and deliver lines from a scripted sketch ending with the homespun homily,“There are some parents who always compare their children with other people’s children,but they never think to compare themselves with other parents.”The occasional bloopers of these senior players make fellow actors fall about laughing.But rather than reproving them,the director joins in the merriment.This is not a stage rehearsal or movie set scenario,but a video shooting taking place at a nursing home in the northern Chinese city of Tianjin.Since last April,Jingya Nursing Home,in an effort to enrich the lives of its elderly residents,has taken the new approach of shooting short videos.These have since attracted nearly a million followers and scored over six million likes on Douyin,the Chinese version of TikTok.展开更多
This paper presents an alternate graphical procedure (Method 2), to that presented in earlier publications entitled, “A Procedure for Trisecting an Acute Angle” and “A Key to Solving the Angle Trisection Problem”....This paper presents an alternate graphical procedure (Method 2), to that presented in earlier publications entitled, “A Procedure for Trisecting an Acute Angle” and “A Key to Solving the Angle Trisection Problem”. The procedure, when applied to the 30˚ and 60˚ angles that have been “proven” to be nottrisectable and the 45˚ benchmark angle that is known to be trisectable, in each case produced a construction having an identical angular relationship with Archimedes’ Construction, as in Section 2 on THEORY of this paper, where the required trisection angle was found to be one-third of its respective angle (i.e. DE’MA = 1/3 DE’CG). For example, the trisection angle for the 30˚, 45˚ and 60˚ angles were 10.00000˚, 15.00000˚, and 20.00000˚, respectively, and Section 5 on PROOF in this paper. Therefore, based on this identical angular relationship and the numerical results (i.e. to five decimal places), which represent the highest degree of accuracy and precision attainable by The Geometer’s Sketch Pad software, one can only conclude that not only the geometric requirements for arriving at an exact trisection of the 30˚ and 60˚ angle (which have been “proven” to be not-trisectable) have been met, but also, the construction is valid for any arbitrary acute angle, despite theoretical proofs to the contrary by Wantzel, Dudley, and others.展开更多
In the reinforcement learning,policy evaluation aims to predict long-term values of a state under a certain policy.Since high-dimensional representations become more and more common in the reinforcement learning,how t...In the reinforcement learning,policy evaluation aims to predict long-term values of a state under a certain policy.Since high-dimensional representations become more and more common in the reinforcement learning,how to reduce the computational cost becomes a significant problem to the policy evaluation.Many recent works focus on adopting matrix sketching methods to accelerate least-square temporal difference(TD)algorithms and quasi-Newton temporal difference algorithms.Among these sketching methods,the truncated incremental SVD shows better performance because it is stable and efficient.However,the convergence properties of the incremental SVD is still open.In this paper,we first show that the conventional incremental SVD algorithms could have enormous approximation errors in the worst case.Then we propose a variant of incremental SVD with better theoretical guarantees by shrinking the singular values periodically.Moreover,we employ our improved incremental SVD to accelerate least-square TD and quasi-Newton TD algorithms.The experimental results verify the correctness and effectiveness of our methods.展开更多
From the days of Ramon y Cajal's first sketches,neuroscientists have recognized the importance of visualizing the complex architecture of the central nervous system.In the past century,we have come to appreciate h...From the days of Ramon y Cajal's first sketches,neuroscientists have recognized the importance of visualizing the complex architecture of the central nervous system.In the past century,we have come to appreciate how the rich structural and functional complementarity of axons and cell types in the spinal cord make it uniquely suited for information transfer between the periphery and the brain.展开更多
In the past,sketches were a standard technique used for recognizing offenders and have remained a valuable tool for law enforcement and social security purposes.However,relying on eyewitness observations can lead to d...In the past,sketches were a standard technique used for recognizing offenders and have remained a valuable tool for law enforcement and social security purposes.However,relying on eyewitness observations can lead to discrepancies in the depictions of the sketch,depending on the experience and skills of the sketch artist.With the emergence of modern technologies such as Generative Adversarial Networks(GANs),generating images using verbal and textual cues is now possible,resulting in more accurate sketch depictions.In this study,we propose an adversarial network that generates human facial sketches using such cues provided by an observer.Additionally,we have introduced an Inverse Gamma Correction Technique to improve the training and enhance the quality of the generated sketches.To evaluate the effectiveness of our proposed method,we conducted experiments and analyzed the results using the inception score and Frechet Inception Distance metrics.Our proposed method achieved an overall inception score of 1.438±0.049 and a Frechet Inception Distance of 65.29,outperforming other state-of-the-art techniques.展开更多
From July 15 to October 15,2023,the UCCA Center for Contemporary Art,Beijing,presents“Matisse by Matisse,”the first solo exhibition by Henri Matisse(1869-1954)ever held in China's mainland.This exhibition is pre...From July 15 to October 15,2023,the UCCA Center for Contemporary Art,Beijing,presents“Matisse by Matisse,”the first solo exhibition by Henri Matisse(1869-1954)ever held in China's mainland.This exhibition is presented in collaboration with Musée Départemental Matisse Du Cateau-Cambrésis and features more than 280 works by the artist from the museum’s collection.It covers Matisse’s entire career and the full range of his practice,encompassing mediums including oil paintings,sculptures,ink drawings,prints,cut-outs,illustrations,sketches,and textiles.The exhibition will subsequently travel to UCCA Edge,Shanghai,where it runs from November 4,2023,through February 18,2024.展开更多
基金supported by Grant from Tateishi Science and Technology Foundation,JSPS KAKENHI grant JP20K19845 and JP19K20316,Japan.
文摘Special skills are required in portrait painting, such as imagining geometric structures and facial detail for final portrait designs. This makes it a difficult task for users, especially novices without prior artistic training, to draw freehand portraits with high-quality details. In this paper, we propose dualFace, a portrait drawing interface to assist users with different levels of drawing skills to complete recognizable and authentic face sketches. Inspired by traditional artist workflows for portrait drawing, dualFace gives two-stages of drawing assistance to provide global and local visual guidance. The former helps users draw contour lines for portraits (i.e., geometric structure), and the latter helps users draw details of facial parts, which conform to the user-drawn contour lines. In the global guidance stage, the user draws several contour lines, and dualFace then searches for several relevant images from an internal database and displays the suggested face contour lines on the background of the canvas. In the local guidance stage, we synthesize detailed portrait images with a deep generative model from user-drawn contour lines, and then use the synthesized results as detailed drawing guidance. We conducted a user study to verify the effectiveness of dualFace, which confirms that dualFace significantly helps users to produce a detailed portrait sketch.
文摘Short videos shot at a nursing home in the northern Chinese city of Tianjin are aimed at enriching the inner world of its elderly residents and maintaining their optimistic life view.Agroup of senior citizens face the camera and deliver lines from a scripted sketch ending with the homespun homily,“There are some parents who always compare their children with other people’s children,but they never think to compare themselves with other parents.”The occasional bloopers of these senior players make fellow actors fall about laughing.But rather than reproving them,the director joins in the merriment.This is not a stage rehearsal or movie set scenario,but a video shooting taking place at a nursing home in the northern Chinese city of Tianjin.Since last April,Jingya Nursing Home,in an effort to enrich the lives of its elderly residents,has taken the new approach of shooting short videos.These have since attracted nearly a million followers and scored over six million likes on Douyin,the Chinese version of TikTok.
文摘This paper presents an alternate graphical procedure (Method 2), to that presented in earlier publications entitled, “A Procedure for Trisecting an Acute Angle” and “A Key to Solving the Angle Trisection Problem”. The procedure, when applied to the 30˚ and 60˚ angles that have been “proven” to be nottrisectable and the 45˚ benchmark angle that is known to be trisectable, in each case produced a construction having an identical angular relationship with Archimedes’ Construction, as in Section 2 on THEORY of this paper, where the required trisection angle was found to be one-third of its respective angle (i.e. DE’MA = 1/3 DE’CG). For example, the trisection angle for the 30˚, 45˚ and 60˚ angles were 10.00000˚, 15.00000˚, and 20.00000˚, respectively, and Section 5 on PROOF in this paper. Therefore, based on this identical angular relationship and the numerical results (i.e. to five decimal places), which represent the highest degree of accuracy and precision attainable by The Geometer’s Sketch Pad software, one can only conclude that not only the geometric requirements for arriving at an exact trisection of the 30˚ and 60˚ angle (which have been “proven” to be not-trisectable) have been met, but also, the construction is valid for any arbitrary acute angle, despite theoretical proofs to the contrary by Wantzel, Dudley, and others.
基金The corresponding author Weinan Zhang was supported by the“New Generation of AI 2030”Major Project(2018AAA0100900)the National Natural Science Foundation of China(Grant Nos.62076161,61772333,61632017).
文摘In the reinforcement learning,policy evaluation aims to predict long-term values of a state under a certain policy.Since high-dimensional representations become more and more common in the reinforcement learning,how to reduce the computational cost becomes a significant problem to the policy evaluation.Many recent works focus on adopting matrix sketching methods to accelerate least-square temporal difference(TD)algorithms and quasi-Newton temporal difference algorithms.Among these sketching methods,the truncated incremental SVD shows better performance because it is stable and efficient.However,the convergence properties of the incremental SVD is still open.In this paper,we first show that the conventional incremental SVD algorithms could have enormous approximation errors in the worst case.Then we propose a variant of incremental SVD with better theoretical guarantees by shrinking the singular values periodically.Moreover,we employ our improved incremental SVD to accelerate least-square TD and quasi-Newton TD algorithms.The experimental results verify the correctness and effectiveness of our methods.
文摘From the days of Ramon y Cajal's first sketches,neuroscientists have recognized the importance of visualizing the complex architecture of the central nervous system.In the past century,we have come to appreciate how the rich structural and functional complementarity of axons and cell types in the spinal cord make it uniquely suited for information transfer between the periphery and the brain.
文摘In the past,sketches were a standard technique used for recognizing offenders and have remained a valuable tool for law enforcement and social security purposes.However,relying on eyewitness observations can lead to discrepancies in the depictions of the sketch,depending on the experience and skills of the sketch artist.With the emergence of modern technologies such as Generative Adversarial Networks(GANs),generating images using verbal and textual cues is now possible,resulting in more accurate sketch depictions.In this study,we propose an adversarial network that generates human facial sketches using such cues provided by an observer.Additionally,we have introduced an Inverse Gamma Correction Technique to improve the training and enhance the quality of the generated sketches.To evaluate the effectiveness of our proposed method,we conducted experiments and analyzed the results using the inception score and Frechet Inception Distance metrics.Our proposed method achieved an overall inception score of 1.438±0.049 and a Frechet Inception Distance of 65.29,outperforming other state-of-the-art techniques.
文摘From July 15 to October 15,2023,the UCCA Center for Contemporary Art,Beijing,presents“Matisse by Matisse,”the first solo exhibition by Henri Matisse(1869-1954)ever held in China's mainland.This exhibition is presented in collaboration with Musée Départemental Matisse Du Cateau-Cambrésis and features more than 280 works by the artist from the museum’s collection.It covers Matisse’s entire career and the full range of his practice,encompassing mediums including oil paintings,sculptures,ink drawings,prints,cut-outs,illustrations,sketches,and textiles.The exhibition will subsequently travel to UCCA Edge,Shanghai,where it runs from November 4,2023,through February 18,2024.
