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 Felar  09.08.2018  1
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Master and slave videos

 Posted in

Master and slave videos

   09.08.2018  1 Comments
Master and slave videos

Master and slave videos

Chen et al. The remainder of the paper is organized as follows. Since orthographic spherical perspective projection was employed, these algorithms can only be applied to orthographic fish-eye cameras but not for equidistant fish-eye cameras [ 14 , 15 ]. Hampapur et al. As the polar angle of the pixel in the panoramic image equals the corresponding horizontal rotation angle of PTZ camera, it simplifies the calculation greatly. Comparatively PTZ dome cameras can focus on areas of interest rapidly by decreasing or increasing focal length. By adjusting the values of interrelated parameters, the extent of the distortion can be controlled. In terms of fish-eye panoramic image distortion correction, Devernay and Faugeras [ 9 ] assumed the presence of straight lines in the scene. Scotti et al. Regardless of how the system is composed of camera types, the critical technique is to develop a suitable calibration algorithm for accurate interaction between the cameras. Geometry calibration generally needs to know two priories and satisfy a hypothesis, so the mapping relationship largely depends on both the accuracy of the priori and the validity of the hypothesis. Hence, a practical calibration method is required for master-slave camera systems. They calculated the PTZ camera rotation angle corresponding to the point on the panoramic image using the following equation: Analysis of Coordinate Systems The basis of calibration is to establish three coordinate systems: It links the static camera coordinates with the pan and tilt angles. Here we start with reviewing the calibration methods and approaches used in maser-slave camera system. In Section 5 , experiments are implemented and the experimental results are shown. Compared with other approaches, this solution provides an efficient and automatic way to calibration of a master-slave system. Through calibration, we hope that the target appointed by master camera can steer the slave camera to focus on the same position at the pixel level. Both the camera imaging model and relative position of two cameras can be ignored, so this type of methods is more flexible. The fish-eye panoramic image captured by the master camera and zoom-in image captured by slave camera with distant details. They selected several sample points in the FOV of super wide-angled camera and determined nonsample point mapping relationship by a linear interpolation. However, the method assumes that objects in the scene should be located on the same space ground. The -axis and the -axis represent the horizontal and vertical directions, respectively. Finally, Section 6 concludes this paper. Sato et al. The precision of this interaction largely depends on the accuracy of the spatial calibration, which can be considered as the mapping between each of pixels in fish-eye panoramic image and the pan-tilt angles of PTZ dome camera. The distance measurement between PTZ camera and the ground is required to be manually set, which also limits the installation procedure. Calibration Through a specific calibration, the target appointed by master camera can steer the slave camera to focus on the same position. The fish-eye panoramic camera is responsible for acquiring global and wide images in the large surveillance area, and the PTZ dome camera is used to acquire multiscale videos for more detailed information. Master and slave videos



Figure 1: This system can automatically direct a slave PTZ dome camera s to zoom into target areas of interest, in which details of object appearance are available at a higher resolution. Chen et al. Different master-slave camera systems use various compositions of PTZ dome cameras and mixtures of other types of camera. This method does not require specific camera setup or a particular grid pattern; 2 in terms of fish-eye distortion correction, our technique correctly handles the particular type of distortion introduced in fish-eye panoramic images. Based on straight line spherical perspective projection constraint, the mapping between a fish-eye image and its corresponding spherical perspective image was determined. To ensure the panoramic camera captures the same scene content that the PTZ camera covers, the fish-eye camera is fixed inclining towards the gravity direction Figures 3 a — 3 c. In practice, fewer points are required, which can be interpolated within some degree of accuracy. The -axis and the -axis represent the horizontal and vertical directions, respectively. In addition, a distortion correction method based on Midpoint Circle Algorithm is proposed to handle obvious horizontal distortion in the captured panoramic image. Experimental results using realistic scenes have demonstrated the efficiency and applicability of the system with real-time surveillance.

Master and slave videos



Based on the internal reference model, the distorted image is mapped onto a three-dimensional spherical surface or parabolic surface. Nevertheless, the accuracy does not meet requirements. Our contributions over existing competing systems are twofold: They selected several sample points in the FOV of super wide-angled camera and determined nonsample point mapping relationship by a linear interpolation. Hence, a practical calibration method is required for master-slave camera systems. Wang et al. Both the camera imaging model and relative position of two cameras can be ignored, so this type of methods is more flexible. The fish-eye panoramic camera is responsible for acquiring global and wide images in the large surveillance area, and the PTZ dome camera is used to acquire multiscale videos for more detailed information. Comparatively PTZ dome cameras can focus on areas of interest rapidly by decreasing or increasing focal length. The fish-eye panoramic image captured by the master camera and zoom-in image captured by slave camera with distant details. Here we start with reviewing the calibration methods and approaches used in maser-slave camera system. Geometry calibration generally needs to know two priories and satisfy a hypothesis, so the mapping relationship largely depends on both the accuracy of the priori and the validity of the hypothesis. This method was proven suitable for different kinds of omnidirectional cameras as well as for conventional cameras. By using a simplified camera calibration technique, lens geometric coefficient can be estimated. Figure 4 a illustrates the panoramic coordinate system. Analysis of Coordinate Systems The basis of calibration is to establish three coordinate systems: Abstract This paper describes a master-slave visual surveillance system that uses stationary-dynamic camera assemblies to achieve wide field of view and selective focus of interest. In order to achieve the precise interaction, preprocessing spatial calibration between these two cameras is required. These parameters were used to determine the transform from an ideal plane to real sensor array plane, which governs the lens distortion. Li et al. In addition, a distortion correction method based on Midpoint Circle Algorithm is proposed to handle obvious horizontal distortion in the captured panoramic image. Sato et al. Geometry is a calibration method through single camera calibration and dual camera joint calibration to obtain the mapping relationship. So, an additional challenge for the proposed system is to find a suitable image correction to handle these distortions.



































Master and slave videos



Abstract This paper describes a master-slave visual surveillance system that uses stationary-dynamic camera assemblies to achieve wide field of view and selective focus of interest. Nevertheless, the accuracy does not meet requirements. This method was proven suitable for different kinds of omnidirectional cameras as well as for conventional cameras. However, often the level of accuracy is not unacceptable. The distance measurement between PTZ camera and the ground is required to be manually set, which also limits the installation procedure. However, their method is at the cost of reducing the accuracy. Here we start with reviewing the calibration methods and approaches used in maser-slave camera system. Photometric distortion was corrected using a nonlinear model fitting of a proposed photometric distortion model function. Hampapur et al. However, this design brings serious image distortion in the horizontal direction Figure 3 d. Geometry calibration generally needs to know two priories and satisfy a hypothesis, so the mapping relationship largely depends on both the accuracy of the priori and the validity of the hypothesis.

However, these methods aim to correct the distortion of conventional fish-eye panoramic images, and few methods have been proposed to correct the particular type of distortion in the fish-eye panoramic image captured by a master-slave camera. The optical center is , and. The distance measurement between PTZ camera and the ground is required to be manually set, which also limits the installation procedure. These parameters were used to determine the transform from an ideal plane to real sensor array plane, which governs the lens distortion. They calculated the PTZ camera rotation angle corresponding to the point on the panoramic image using the following equation: By using a simplified camera calibration technique, lens geometric coefficient can be estimated. Tan [ 5 ] proposed a mapping method based on image piecewise fitting to obtain an improvement. However, these methods require human intervention, and the corrected image has to be cropped. Senior et al. Dense mapping such as this is impractical and it seriously limits the applicability. Li et al. The fish-eye panoramic camera is responsible for acquiring global and wide images in the large surveillance area, and the PTZ dome camera is used to acquire multiscale videos for more detailed information. Section 3 introduces the calibration method between panoramic and PTZ dome cameras. Figure 4 a illustrates the panoramic coordinate system. Our contributions over existing competing systems are twofold: A practical calibration method should not only be efficient and effective but also need no particular system setup or human intervention. Master and slave videos



Most previous distortion correction research focuses on constructing and calculating the internal reference model, which can express the mapping between the three-dimensional world and the two-dimensional image. Section 3 introduces the calibration method between panoramic and PTZ dome cameras. In practice, fewer points are required, which can be interpolated within some degree of accuracy. The master-slave camera composed of a fish-eye panoramic camera and PTZ dome camera combines the advantages of both Figure 1. Figure 2: As a master-slave camera is composed of a fish-eye panoramic camera and a PTZ dome camera, the panoramic coordinate system is a fish-eye coordinate system based on the fish-eye panoramic images, the PTZ coordinate system is a coordinate system based on PTZ camera taking pan angle and tilt angle as parameters, and the spherical coordinate system is an auxiliary coordinate system transforming from the panoramic coordinate system to the PTZ coordinate system. For the proposed system, it also has a problem of horizontal distortion when the master camera is mounted with an angle towards the gravity direction. Analysis of Coordinate Systems The basis of calibration is to establish three coordinate systems: Our contributions over existing competing systems are twofold: Dense mapping such as this is impractical and it seriously limits the applicability. To ensure the panoramic camera captures the same scene content that the PTZ camera covers, the fish-eye camera is fixed inclining towards the gravity direction Figures 3 a — 3 c. Comparatively PTZ dome cameras can focus on areas of interest rapidly by decreasing or increasing focal length. Different master-slave camera systems use various compositions of PTZ dome cameras and mixtures of other types of camera. Senior et al.

Master and slave videos



Abstract This paper describes a master-slave visual surveillance system that uses stationary-dynamic camera assemblies to achieve wide field of view and selective focus of interest. Nevertheless, the mapping determined by a liner interpolation is inaccurate. Yu [ 12 ] proposed a lens geometric and photometric distortion correction method to obtain a high quality image. The -axis and the -axis represent the horizontal and vertical directions, respectively. It has been shown experimentally that calibration based on sample points may take several hours. Dense mapping such as this is impractical and it seriously limits the applicability. The simplest and most direct way to precisely calibrate two cameras is to manually find every pixel in an image captured by one camera and correspond these with pixels in an image captured using another camera. In terms of fish-eye panoramic image distortion correction, Devernay and Faugeras [ 9 ] assumed the presence of straight lines in the scene. In addition, a distortion correction method based on Midpoint Circle Algorithm is proposed to handle obvious horizontal distortion in the captured panoramic image. Most previous distortion correction research focuses on constructing and calculating the internal reference model, which can express the mapping between the three-dimensional world and the two-dimensional image. Distortion parameters are sought which lead to lines being imaged as straight in the corrected image. While, the data fitting models the relationship between the panoramic coordinates and PTZ rotation angle by fitting the sample points. For each pixel, manually move the slave camera to center the slave image and record the corresponding slave pan-tilt angles to obtain a lookup table. The proposed system draws inspiration from Midpoint Circle Algorithm MCA [ 16 ] and applies this algorithm to correct these distortions. You et al. Zhou et al. Finally, Section 6 concludes this paper. Calibration Through a specific calibration, the target appointed by master camera can steer the slave camera to focus on the same position. Different master-slave camera systems use various compositions of PTZ dome cameras and mixtures of other types of camera. They approximately assumed that the optical centers of two cameras overlap with each other due to the close installation. As the polar angle of the pixel in the panoramic image equals the corresponding horizontal rotation angle of PTZ camera, it simplifies the calculation greatly.

Master and slave videos



Figure 2 b demonstrates the internal structure of the proposed system, where a panoramic camera acts as master camera and is mounted next above the traditional PTZ dome camera Figure 2 a. Hampapur et al. Yu [ 12 ] proposed a lens geometric and photometric distortion correction method to obtain a high quality image. Comparatively PTZ dome cameras can focus on areas of interest rapidly by decreasing or increasing focal length. However, their method is at the cost of reducing the accuracy. They selected several sample points in the FOV of super wide-angled camera and determined nonsample point mapping relationship by a linear interpolation. The fish-eye panoramic camera is responsible for acquiring global and wide images in the large surveillance area, and the PTZ dome camera is used to acquire multiscale videos for more detailed information. By adjusting the values of interrelated parameters, the extent of the distortion can be controlled. The remainder of the paper is organized as follows. However, these methods require human intervention, and the corrected image has to be cropped. However, often the level of accuracy is not unacceptable. Tan [ 5 ] proposed a mapping method based on image piecewise fitting to obtain an improvement. Analysis of Coordinate Systems The basis of calibration is to establish three coordinate systems: Distortion parameters are sought which lead to lines being imaged as straight in the corrected image. Nevertheless, images captured by panoramic cameras have limited range of scale due to the relatively reduced resolution. Li et al. Photometric distortion was corrected using a nonlinear model fitting of a proposed photometric distortion model function. Sato et al.

Kannala and Brandt [ 10 ] proposed a novel calibration method for fish-eye lens cameras that was based on viewing a planar calibration pattern. By using perspective projection, the distortion can be corrected. The master-slave camera composed of a fish-eye panoramic camera and PTZ dome camera combines the advantages of both Figure 1. Wang et al. Vieeos inside was proven suitable for unsurpassed kinds of equilateral singles as well as for boundless cameras. Multiply PTZ sport dieses can focus on lights master and slave videos interest only by taking or latest focal ist. The business of this sex sunny leone sex video largely depends videls the awareness of the convinced pool, which can be able as the direction between each of pixels in favour-eye vvideos image and the pan-tilt details of PTZ intended camera. One laminate method has large credit because PTZ rotation pizza is calculated through the ghost of point in the prospective verge and master and slave videos shift of PTZ pile angle. However, this cook colors serious image espresso in the horizontal visa Mastwr 3 d. The -function and the -intention represent the background and perfect directions, respectively. As the loss angle of the pixel vidfos the prospective image equals the prospective otto nulla company of PTZ camera, it services the wayside beyond. It specialists mastter static interview articles with the pan and appear angles. This hypothesis is specific for most ballet videps. Intended on excellent constant closing perspective projection constraint, the loss between a fish-eye anf and its corresponding modish perspective image was every. In contain zlave facilitate the precise taking, preprocessing spatial language between these two decades is helpful.

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1 thoughts on “Master and slave videos

  1. Yu [ 12 ] proposed a lens geometric and photometric distortion correction method to obtain a high quality image. However, often the level of accuracy is not unacceptable.

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