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A vast majority of consumer cameras operate the rolling shutter mechanism, which often produces distorted images due to inter-row delay while capturing an image. Recent methods for monocular rolling shutter compensation utilize blur kernel, straightness of line segments, as well as angle and length preservation. However, they do not incorporate scene geometry explicitly for rolling shutter correction,...
A minimal solution using two affine correspondences is presented to estimate the common focal length and the fundamental matrix between two semi-calibrated cameras – known intrinsic parameters except a common focal length. To the best of our knowledge, this problem is unsolved. The proposed approach extends point correspondence-based techniques with linear constraints derived from local...
The article concerns the automatic calibration of a camera with radial distortion from a single image. It is known that, under the mild assumption of square pixels and zero skew, lines in the scene project into circles in the image, and three lines suffice to calibrate the camera up to an ambiguity between focal length and radial distortion. The calibration results highly depend on accurate circle...
This paper points out a new telltale trace – the characteristic of perspective distortion (CPD), for the image forensics of faces. The perspective distortion is determined by the position of image shooting, and it is often overlooked when creating a forgery, which results in the inconsistency between the claimed camera parameters and the CPD in the face image. To investigate this consistency problem,...
Calibration of color and infra-red cameras is the fundamental step in almost every 2D or 3D image processing applications and pre-processing of images and videos. This article presents a novel method for estimation of 19 parameters of RGB and depth camera calibration in Kinect sensor, simultaneously. The proposed algorithm is based on applying shuffled frog leaping algorithm (SFLA) for deep optimization...
An indispensable pre-processing step for image-based 3D reconstruction or photogrammetry tasks is undistortion, which is employed for correcting the non-linear projection of the surface points of objects onto the image plane due to lens distortion. To deal with this undesirable artifact, state-of-the-art methods focus on directly recovering the 2D coordinates of image points from distorted images,...
Projecting an image onto an arbitrary non-flat screen surface leads to undesired geometric distortions in the image's projection. Geometric correction pre-distorts the image being projected such that the image's projection appears geometrically correct. In this work, we propose a novel saliency-guided projection geometric correction (SPGC) method that leverages calibration parameters along with 3D...
In three-dimensional videos (3-DVs) with ${n}$ -view texture videos plus ${n}$ -view depth maps, virtual views can be synthesized from neighboring texture videos and the associated depth maps. To evaluate the system performance or guide the rate-distortion-optimization process of 3-DV coding, the distortion/PSNR of the virtual view should be calculated by measuring the quality difference between...
This paper deals with the procedure of determination of the mutual displacement between two corresponding cameras using image stereo pair and prior information coming from camera calibration. This whole process of distance estimation consists of multiple steps which are explained on the next pages. To evaluate the described approach, an experimental test was designed and performed. All the obtained...
Depth coding in 3D video is unique in that its quality is measured by the view synthesis distortion (VSD) rather than its own depth distortion, which further complicates the coding optimization as VSD is related to both the depth and texture quality. We propose a parameter-free VSD model to directly estimate the impact of depth errors on VSD on the small block basis, given its depth distortion. The...
With the development of 3D video technology, many studies have paid attention to compression efficiency and rate distortion performance. When 3D videos are transmitted over error-prone channels, they may suffer significant quality degradation. In this paper, we combine multiview video coding (MVC) with multiple description coding (MDC) for robust transmission. The proposed scheme can give full consideration...
We propose an analytical model to estimate the depth-error-induced virtual view synthesis distortion (VVSD) in 3D video, taking into account the configuration of the cameras. Focusing on view synthesis under depth error, we carefully analyze the merging operations under different situations that affect pixel availability: overlapping region, disocclusion and boundary region, disparity error region,...
The 6-DOF (Degrees Of Freedom) image localization, which aims to calculate the spatial position and rotation of a camera, is a challenging task for location-based services. In existing approaches, this problem is often tackled by finding the matches between 2D image points and 3D structure points so as to derive the location information using direct linear transformation (DLT). However, these approaches...
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