With growing popularity of digital imaging devices and low-cost image editing software, the integrity of image content can no longer be taken for granted. This paper introduces a methodology for forensic analysis of digital camera images, based on the observation that many in-camera and post-camera processing operations leave distinct traces on digital images. We present methods to identify the...

Rapid camera rotations (e.g. camera shake) are a significant problem when real-time computer vision algorithms are applied to video from a handheld or head-mounted camera. Such camera motions cause image features to move large distances in the image and cause significant motion blur. Here we propose a very fast method of estimating the camera rotation from a single frame which does not require ...

In this paper we present an image mosaicing method for camera-captured document images. Our method is unique in not restricting the camera position, thus allowing greater flexibility than scanner-based or fixed-camera-based approaches. To accommodate for the perspective distortions introduced by varying poses, we implement a two-step image registration process that relies on accurately computin...

Camera calibration is the problem of estimating a camera’s intrinsic parameters, which among others include the focal length and image center of the camera. The estimation of the camera’s intrinsic parameters is important as it is a prerequisite to a wide variety of vision tasks related to motion and stereo analysis. Historically, camera calibration was performed by knowledge of 3D world points...