نتایج جستجو برای: image distortion

تعداد نتایج: 411399  

2005
Chanjira Sinthanayothin Wisarut Bholsithi

This article has shown the simulation change after moving the landmarks within medical image by applying 3-dimension thin plate spline through the following 3 steps: The first step is to write the program to open and display 3-dimension medical images by using Borland C++ Builder 6 as the compiler along with OpenGL as the engine to display the images. The second step is to distort 3 dimension i...

2009
Mashhour Solh Ghassan Al-Regib

Multi-camera systems have been evolving as next generation video cameras with applications including 3D reconstruction, image-based rendering, free viewpoint, and 3D TV. Quantifying visual quality of multi-camera systems is fundamental in developing these applications. In this paper, image distortion types in multi-camera systems are investigated where distortion is classified as either geometr...

1998
Rahul Swaminathan Shree K. Nayar

Images taken with wide-angle cameras tend to have severe distortions which pull points towards the optical center. This paper proposes a new method for recovering the distortion parameters without using any calibration objects. The distortions cause straight lines in the scene to appear as curves in the image. Our algorithm seeks to find the distortion parameters that would map the image curves...

Journal: :IEICE Transactions on Information and Systems 2023

Since the dark channel prior (DCP)-based dehazing method is ineffective in sky area and will cause problem of too color distortion image, we propose a novel based on segmentation image fusion. We first segment according to characteristics non-sky then estimate atmospheric light transmission map DCP correct them, fuse original after contrast adaptive histogram equalization improve details inform...

2013
Rui Melo Michel Antunes João Pedro Barreto Gabriel Falcão Paiva Fernandes Nuno Gonçalves

Estimating the amount and center of distortion from lines in the scene has been addressed in the literature by the socalled “plumb-line” approach. In this paper we propose a new geometric method to estimate not only the distortion parameters but the entire camera calibration (up to an “angular” scale factor) using a minimum of 3 lines. We propose a new framework for the unsupervised simultaneou...

2003
Helmut Zollner

In this report we present a new calibration technique for off-the-shelf CCD cameras and acquisition systems. The estimated camera model includes 6 extrinsic and up to 8 intrinsic model parameters including radial and tangential distortion. Also an inverse distortion function for correction of distortion effects can be estimated. Planar and non-planar objects can be used as previously measured c...

2013
Michael Gadermayr Michael Liedlgruber Andreas Uhl Andreas Vécsei

In the field of computer aided celiac disease diagnosis, wide-angle endoscopy lenses are employed which introduce significant barrel type distortions. Although the images can be rectified using distortion correction methods, computer based diagnosis suffers from missing information in highly distorted image regions. First, we investigate the impact of simple and advanced interpolation technique...

2011
Anna Hilsmann David C. Schneider Peter Eisert

Retexturing is the process of realistically replacing the texture of an object or surface in a given image by a new, synthetic one, such that texture distortion as well as lighting conditions of the original image are preserved. The key challenge is to separate the shading information from the actual local texture and to retrieve the texture distortion from an image without any knowledge of the...

Journal: :Image Vision Comput. 2010
Ciarán Hughes Robert McFeely Patrick Denny Martin Glavin Edward Jones

0262-8856/$ see front matter 2009 Elsevier B.V. A doi:10.1016/j.imavis.2009.09.001 * Corresponding author. Tel.: +353 91 49 2605; fax E-mail addresses: [email protected] (C. Hughes). Radial distortion in an image is a geometric distortion that causes a non-linear variation in resolution across the image, with a higher spatial resolution in the central areas of the image, and lower reso...

Journal: :Signal Processing 2016
Ashirbani Saha Q. M. Jonathan Wu

Full-reference image quality assessment (FR-IQA) techniques compare a reference and a distorted/test image and predict the perceptual quality of the test image in terms of a scalar value representing an objective score. The evaluation of FR-IQA techniques is carried out by comparing the objective scores from the techniques with the subjective scores (obtained from human observers) provided in t...

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