The linear multi-baseline stereo system introduced by the CMU-RI group has been proven to be a very effective and robust stereovision system. However, most traditional stereo rectification algorithms are all designed ...The linear multi-baseline stereo system introduced by the CMU-RI group has been proven to be a very effective and robust stereovision system. However, most traditional stereo rectification algorithms are all designed for binocular stereovision system, and so, cannot be applied to a linear multi-baseline system. This paper presents a simple and intuitional method that can simultaneously rectify all the cameras in a linear multi-baseline system. Instead of using the general 8-parameter homography transform, a two-step virtual rotation method is applied for rectification, which results in a more specific transform that has only 3 parameters, and more stability. Experimental results for real stereo images showed the presented method is efficient.展开更多
To see what lacks representation on stage is a fully creative act that the spectator performs thanks to his or her imagination, as （s）he is called to retrieve via memory what is objectively absent from the scene. Th...To see what lacks representation on stage is a fully creative act that the spectator performs thanks to his or her imagination, as （s）he is called to retrieve via memory what is objectively absent from the scene. The Renaissance audience accomplished such a creative act by making use of rhetoric and figurative arts. However, it is pre-eminently words that trigger and support the imagination, as Shakespeare＇s drama best exemplifies. Both in the Elizabethan drama and in the Italian Renaissance theatre, with its perspectival vision, the spectator＇s creative act takes place in an ideal space where the stage space turns into the locus of stereoscopic vision. Consequently, the creation and consumption of the vision originates first and foremost in drama （comedy and tragedy）. The psychological, aesthetic, and anthropological mechanisms at the heart of vision, and the fruition of the images deriving from words, can be found as operating within the dramatic text, from the point of view of both the playwright and of the spectator/listener, in a direct relationship of cause and effect. Religious and especially Jesuitical drama, whose theatrical experience aims at discovering a correspondence between words and images, testifies to the visual power of the theatre.展开更多
Omnidirectional imaging sensors have been used in more and more applications when a very large field of view is required.In this paper,we investigate the unwrapping,epipolar geometry and stereo rectification issues fo...Omnidirectional imaging sensors have been used in more and more applications when a very large field of view is required.In this paper,we investigate the unwrapping,epipolar geometry and stereo rectification issues for omnidirectional vision when the particular mirror model and the camera parameters are unknown in priori.First,the omnidirectional camera is calibrated under the Taylor model,and the parameters related to this model are obtained.In order to make the classical computer vision algorithms of conventional perspective cameras applicable,the ring omnidirectional image is unwrapped into two kinds of panoramas:cylinder and cuboid.Then the epipolar geometry of arbitrary camera configuration is analyzed and the essential matrix is deduced with its properties being indicated for ring images.After that,a simple stereo rectification method based on the essential matrix and the conformal mapping is proposed.Simulations and real data experimental results illustrate that our methods are effective for the omnidirectional camera under the constraint of a single view point.展开更多
文摘The linear multi-baseline stereo system introduced by the CMU-RI group has been proven to be a very effective and robust stereovision system. However, most traditional stereo rectification algorithms are all designed for binocular stereovision system, and so, cannot be applied to a linear multi-baseline system. This paper presents a simple and intuitional method that can simultaneously rectify all the cameras in a linear multi-baseline system. Instead of using the general 8-parameter homography transform, a two-step virtual rotation method is applied for rectification, which results in a more specific transform that has only 3 parameters, and more stability. Experimental results for real stereo images showed the presented method is efficient.
文摘To see what lacks representation on stage is a fully creative act that the spectator performs thanks to his or her imagination, as （s）he is called to retrieve via memory what is objectively absent from the scene. The Renaissance audience accomplished such a creative act by making use of rhetoric and figurative arts. However, it is pre-eminently words that trigger and support the imagination, as Shakespeare＇s drama best exemplifies. Both in the Elizabethan drama and in the Italian Renaissance theatre, with its perspectival vision, the spectator＇s creative act takes place in an ideal space where the stage space turns into the locus of stereoscopic vision. Consequently, the creation and consumption of the vision originates first and foremost in drama （comedy and tragedy）. The psychological, aesthetic, and anthropological mechanisms at the heart of vision, and the fruition of the images deriving from words, can be found as operating within the dramatic text, from the point of view of both the playwright and of the spectator/listener, in a direct relationship of cause and effect. Religious and especially Jesuitical drama, whose theatrical experience aims at discovering a correspondence between words and images, testifies to the visual power of the theatre.
基金supported by the National Natural Science Foundation of China (Nos.60502006,60534070 and 90820306)the Science and Technology Plan of Zhejiang Province,China (No.2007C21007)
文摘Omnidirectional imaging sensors have been used in more and more applications when a very large field of view is required.In this paper,we investigate the unwrapping,epipolar geometry and stereo rectification issues for omnidirectional vision when the particular mirror model and the camera parameters are unknown in priori.First,the omnidirectional camera is calibrated under the Taylor model,and the parameters related to this model are obtained.In order to make the classical computer vision algorithms of conventional perspective cameras applicable,the ring omnidirectional image is unwrapped into two kinds of panoramas:cylinder and cuboid.Then the epipolar geometry of arbitrary camera configuration is analyzed and the essential matrix is deduced with its properties being indicated for ring images.After that,a simple stereo rectification method based on the essential matrix and the conformal mapping is proposed.Simulations and real data experimental results illustrate that our methods are effective for the omnidirectional camera under the constraint of a single view point.
