A challenge in image based metrology and forensics is intrinsic camera calibration when the used unavailable. The unavailability raises two questions. first question how to find projection model that describes camera, second detect incorrect models. In this work, we use off-the-shelf extended PnP-methods from 2D-3D correspondences, propose a method for validation. most common strategy evaluatin...

The probability of obtaining images target species may vary across camera models or relative position cameras at survey locations. Alignment within paired stations (hereafter, stations) could affect detection due to issues with image exposure. We quantified effects 3 and alignment (staggered, offset by a perpendicular distance 4.6 m, aligned, directly facing one another) on performance in stati...

in this paper, a new method for determining position and orientation of a coordinate system using its image is presented. this coordinate system is a three dimensional non-orthogonal system in respect to the two dimensional and orthogonal camera coordinate system.  in real world, it’s exactly easy to select three directions on an object so that they don’t be orthogonal and on a plane. the image...

where W = [W1,W2,W3] is a world point in the world reference frame, X = [X1, X2, X3] is W reexpressed in the camera’s reference frame, x = [x1, x2] is the projection of X in the canonical camera reference frame, ξ = [ξ1, ξ2] is x re-expressed in the image reference frame. The vector π = [π1, π2] is the principal point in image coordinates, f is the camera’s focal distance, and the diagonal elem...

Automatic camera control aims to define a framework to control virtual camera movements in dynamic and unpredictable virtual environments while ensuring a set of desired visual properties. We investigate the relationship between camera placement and playing behaviour in games and build a user model of the camera behaviour that can be used to control camera movements based on player preferences....

where c is the column and r is the row. (This is a Point Grey convention, and it assumes the camera center is exactly in the center column and row of the image. In fact, proper camera calibration can be done to get a better estimate of the center.) The (X,Y,Z) coordinate system is shown in Fig. 1, and the (u, v) system in Fig. 2: Z points along line of sight, away from camera; X (and also u) po...

Recently, Tuceryan and Navab introduced a method for calibrating an optical see-through system based on the alignment of a set of 2D markers on the display with a single point in the scene while not restricting the user’s head movements (the single point active alignment method or SPAAM in short) [33]. This method is applicable with any tracking system, provided that it gives the pose of the se...

Although there are intrinsic advantages of using pan-tilt-zoom cameras their application in automatic surveillance systems is still scarce. The difficulty of creating background models for moving cameras and the difficulty of keeping fitted pose and optical geometrical projection models are key reasons for the limited use of pan-tilt-zoom cameras. Geometric calibration is a useful tool to overc...

In the first part we discuss the problem of recovering the calibration of a network of pan-tilt-zoom cameras. The intrinsic parameters of each camera over its full range of zoom settings are estimated through a two step procedure. We first determine the intrinsic parameters at the camera’s lowest zoom setting very accurately by capturing an extended panorama. The camera intrinsics are then dete...

This report presents Camera Motion Graphs, a new technique to easily and efficiently generate cinematographic sequences in real-time dynamic 3D environments. A camera motion graph consists of (i) pieces of original camera trajectories attached to one or multiple targets, (ii) generated continuous transitions between those trajectories and (iii) transitions representing cuts between two camera t...