Blar i Institutt for informasjonssikkerhet og kommunikasjonsteknologi på emneord "VDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation, visualization, signal processing, image processing: 429"
Viser treff 1-20 av 35
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Automatic Redeye Correction Algorithm with Multilevel Eye Confirmation
(Journal article; Peer reviewed, 2010)Redeye is a well-known problem in portrait photography. This effect is caused by the light entering the subject's eye through the pupil and reflection from the retina back to the imaging sensor. Many of the existing redeye ... -
Camera based Display Image Quality Assessment
(Doctoral Dissertations at Gjøvik University College;3-2015, Doctoral thesis, 2015-11-04)This thesis presents the outcomes of research carried out by the PhD candidate Ping Zhao during 2012 to 2015 in Gjøvik University College. The underlying research was a part of the HyPerCept project, in the program of ... -
Characterizing the response of charge-couple device digital color cameras
(Journal article; Peer reviewed, 2012)The advance and rapid development of electronic imaging technology has lead the way to production of imaging sensors capable of acquiring good quality digital images with a high resolution. At the same time the cost and ... -
Comparison of eye tracking devices used on printed images
(Proceedings of SPIE;6806, Journal article; Peer reviewed, 2008)Eye tracking as a quantitative method for collecting eye movement data, requires the accurate knowledge of the eye position, where eye movements can provide indirect evidence about what the subject sees. In this study two ... -
Compensating for non-uniform screens in projection display systems
(Proceedings of SPIE;7241, Journal article; Peer reviewed, 2009)In this paper the performance of screen compensation based on previous work by Nayar et al. and Ashdown et al. and five different camera characterization methods are evaluated. Traditionally, colorimetric characterization ... -
Computational Color Constancy using a Stereo Camera
(Chapter; Peer reviewed, 2012)Chromagenic color constancy is one of the promising solutions to the color constancy problem. However, this technique requires two shots of a scene: a conventional RGB image and an additional image that is optically ... -
Computational color constancy using chromagenic filters in color filter arrays
(Journal article; Peer reviewed, 2012)We have proposed, in this paper, a new color constancy technique, an extension to the chromagenic color constancy. Chromagenic based illuminant estimation methods take two shots of a scene, one without and one with a ... -
Detection of worms in error diffusion halftoning
(Proceedings of SPIE;7242, Journal article; Peer reviewed, 2009)Digital halftoning is used to reproduce a continuous tone image with a printer. One of these halftoning algorithms, error diffusion, suffers from certain artifacts. One of these artifacts is commonly denoted as worms. We ... -
Development of an adaptive bilateral filter for evaluating color image difference
(Journal article; Peer reviewed, 2012)patial filtering, which aims to mimic the contrast sensitivity function (CSF) of the human visual system (HVS), has previously been combined with color difference formulae for measuring color image reproduction errors. ... -
Evaluating the smoothness of color transformations
(Proceedings of SPIE;7866, Journal article; Peer reviewed, 2011)Multi-dimensional look up tables (LUTs) are widely employed for color transformations due to its high accuracy and general applicability. Using the LUT model generally involves the color measurement of a large number of ... -
Evaluation of Algorithms for the Determination of Color Gamut Boundaries
(Journal article; Peer reviewed, 2010)Several techniques for the computation of gamut boundaries have been presented in the past. In this article we take an in-depth look at some of the gamut boundary descriptors used when performing today's gamut mapping ... -
Extraction and fusion of spectral parameters for face recognition
(Proceedings of SPIE;7877, Journal article; Peer reviewed, 2011)Many methods have been developed in image processing for face recognition, especially in recent years with the increase of biometric technologies. However, most of these techniques are used on grayscale images acquired in ... -
Fingerprint Image Quality: Predicting Biometric Performance
(Doctoral Dissertations at Gjøvik University College;5-2015, Doctoral thesis, 2015-11-30)Biometric systems and fingerprint recognition systems in particular have become very widespread in the recent years, both in mobile devices and through increased usage in border controls and electronic national identification ... -
Full Reference Image Quality Assessment Based on Saliency Map Analysis
(Journal article; Peer reviewed, 2010)Region saliency has not been fully considered in most previous image quality assessment models. In this article, the contribution of any region to the global quality measure of an image is weighted with variable weights ... -
Image quality metrics for the evaluation of print quality
(Proceedings of SPIE;7867, Journal article; Peer reviewed, 2011)Image quality metrics have become more and more popular in the image processing community. However, so far, no one has been able to define an image quality metric well correlated with the percept for overall image quality. ... -
An inverse display color characterization model based on an optimized geometrical structure
(Proceedings of SPIE;6807, Journal article; Peer reviewed, 2008)We have defined an inverse model for colorimetric characterization of additive displays. It is based on an optimized three-dimensional tetrahedral structure. In order to minimize the number of measurements, the structure ... -
Kubelka-Munk theory for efficient spectral printer modeling
(Proceedings of SPIE;7866, Journal article; Peer reviewed, 2011)In the context of spectral color image reproduction by multi-channel inkjet printing a key challenge is to accurately model the colorimetric and spectral behavior of the printer. A common approach for this modeling is to ... -
Measuring perceptual contrast in a multilevel framework
(Proceedings of SPIE;7240, Journal article; Peer reviewed, 2009)In this paper, we propose and discuss some approaches for measuring perceptual contrast in digital images. We start from previous algorithms by implementing different local measures of contrast and a parameterized way to ... -
Modeling and Halftoning for Multichannel Printers: A Spectral Approach
(Doctoral Dissertations at Gjøvik University College;4-2015, Doctoral thesis, 2015-11-30)Printing has been has been the major communication medium for many centuries. In the last twenty years, multichannel printing has brought new opportunities and challenges. Beside of extended colour gamut of the multichannel ... -
Multispectral Imaging using a Stereo Camera: Concept, Design and Assessment
(Journal article; Peer reviewed, 2011)This paper proposes a one-shot six-channel multispectral color image acquisition system using a stereo camera and a pair of optical filters. The two filters from the best pair selected from among readily available filters ...