Curled textlines segmentation is a necessary initial step for the hand-held camera-captured document image processing. Curled textlines information is often used as an intermediate step for camera-captured document image dewarping. Curled textlines information can also be used for other camera-based document image processing tasks, like layout analysis etc. So far no work has been done for the ...

We present a technique for the registration of multiple surveillance cameras through the automatic alignment of image trajectories. The algorithm address the problem of recovering the relative pose of several stationary cameras that observe one or more objects in motion. Each camera tracks several objects to produce a set of trajectories in the image. Using a simple calibration procedure, we re...

We propose a novel technique for background estimation on the tabletop systems that have an information display on the tabletop and observe tabletop objects with a camera. In such systems, the background of an image observed with the camera includes the image shown on the tabletop display. The background varies according to the information presented on the tabletop display. Although we can esti...

Face recognition systems typically have a rather short operating distance with standoff (distance between the camera and the subject) limited to 1∼2 meters. When these systems are used to capture face images at a larger distance (5∼10 m), the resulting images contain only a small number of pixels on the face region, resulting in a degradation in face recognition performance. To address this pro...

In this paper, we propose a geometrical compensation algorithm for multiview image captured by an arc multi-camera array. To capture multiview image or multiview video, we require more than two cameras arranged on a multicamera array. This multi-camera array, however, has geometrical errors since it is manually built. These errors are related to the mismatch in the vertical and horizontal direc...

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...

Since image-based visual servoing is a local feedback control solution, it requires the definition of intermediate subgoals in the sensor space at the task planning level. In this paper, we describe a general technique fo r specifying and tracking trajectories of an unknown object in the camera image space. First, physically valid C2 image trajectories which correspond to quasi-optimal 3 0 came...

We introduce a novel method to automatically adjust camera exposure for image processing and computer vision applications of mobile robot platforms. Since most image processing algorithms heavily rely on low-level image features, which are largely based on local gradient information, we consider a gradient quantity to determine a proper exposure level, so that a camera is able to capture import...

In this paper, we present a new system to generate multiview video sequences with depth information (MVD) by integrating multiple high-definition (HD) camera arrays and one standard-definition (SD) depth camera. In the proposed hybrid camera system, we first create the initial disparity for each HD color image by applying a threedimensional (3-D) warping operation on the depth map acquired by t...