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New method of obtaining image edges by optical non-linear material based switching operation.

New method of obtaining image edges by optical non-linear ma...

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conference on Asia-Pacific Optical and Wireless Communication (APOC 2002)

作者： Dhar, S Mukhopadhyay, S Vidyasagar Univ Dept Phys & Technophys Midnapore 721102 W Bengal India

ISBN: (纸本)0819446963

In digital image processing image edge detection, enhancement and extraction have very important role. There are many methods and systems, already accepted very widely, which show the above operations with their own advantages and limitations. Here in this paper we propose a completely new scheme of getting the edge of any digital image by proper use of optical non-linear material. Some intensity modulated switching behaviors of optical non-linear materials are also coped up in this method. Here we can obtain the required image edges as necessary. images with variation of transparencies are used here suitably.

关键词： image edge detection Non linear medium Optical switch Optical communications.

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A hierarchical approach for registration of high-resolution polarimetric SAR images

A hierarchical approach for registration of high-resolution ...

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conference on image and Signal processing for Remote Sensing VII

作者： Borghys, D Perneel, C Acheroy, M Royal Mil Acad Signal & Image Ctr B-1000 Brussels Belgium

ISBN: (纸本)0819442666

The presented work aims to automatically register high-resolution polarimetric SAR images with each other and other types of images. A digital topographic map is used as an aid for the registration. SAR images are very different from visual or infrared images. The idea is to identify, for each type of image, objects present on the map and easily detectable in the image. Detecting these objects in the image and matching them between map and image provides a first registration. Several object detectors were developed for the subsequent stages of the registration. Each of these detectors is briefly described. The actual registration uses a hierarchical method. First the SAR image is converted into ground range. Then a rough registration between image and map is obtained based on the position of forests and/or built-up areas. A voting method is used to find the parameters of a simple transformation model and to match the objects between map and image. The third step finds the parameters of an affine transformation based on the objects matched by the voting method. To improve the registration, objects with low 3D structure, e.g. roads and rivers, are used. The method for detecting these in SAR images yields an incomplete results leading to ambiguities for the optimal local displacement. Optimisation methods are used to overcome this problem and yield the parameters of a global transformation model. The accuracy of the registration is now within the accuracy of the map. Once the different images are registered with the map, the results of edge detectors are used to refine the registration between them.

关键词： image registration polarimetric SAR built-up areas edge detection

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What is worse:: Decreased spatial resolution or increased noise?

What is worse:: Decreased spatial resolution or increased no...

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Medical Imaging 2002 conference

作者： Tingberg, A Herrmann, C Besjakov, J Almén, A Sund, P Adliene, D Mattsson, S Mansson, LG Panzer, W Malmo Univ Hosp Dept Radiat Phys SE-20502 Malmo Sweden

ISBN: (纸本)0819444316

Purpose: To investigate the relative importance of spatial resolution and noise on the image quality of clinical radiographs. Methods: The spatial resolution and noise of fifteen digitised lumbar spine radiographs were altered with image processing. Three different MTF curves and three different Wiener spectra were combined into seven different combinations of spatial resolution and noise. These seven combinations were applied to the original data set, and the resulting images were printed on film. Seven expert radiologists evaluated the clinical image quality of the resulting images with visual grading analysis (VGA) of structures based on the European image Criteria. Results: The results show that added noise is more deteriorating than reduced spatial resolution for the clinical image quality. For a given MTF and noise level, the worst was the one with increased noise followed by the one with both reduced MTF and added noise (mimicking a faster screen-film combination). Reduced MTF only gave the highest rating. Conclusions: It is more important to find methods for removing noise than to try to improve the MTF of a radiographic system. A noisy image can sometimes be improved by reducing the spatial resolution.

关键词： diagnostic radiology lumbar spine radiography contrast manipulation modulation transfer function(MTF) Wiener spectrum visual grading analysis (VGA) European image Criteria evaluation methods for clinical image quality

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Loss of Spectral Information in the Colour Signals Filtered by the Human visual System

Loss of Spectral Information in the Colour Signals Filtered ...

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Final Programme and Proceedings;First European conference on Colour in Graphics, Imaging and Vision (CGIV'2002)

作者： Romero, Javier Nieves, Juan L. Valero, Eva Hernández-Andrés, Javier Garcia, José A. Departamento de Óptica Facultad de Ciencias Universidad de Granada Granada Spain

ISBN: (纸本)0892082399

Different authors have studied the response of the human visual system (HVS) in the chromatic frequency domain and have obtained its spectral modulation sensitivity function (SMSF), either computationally1 or experimentally.2,3 The Fourier analysis applied to the colour signals (product of the spectral power distribution of the illuminant and the reflectance or transmittance function of an object) carries out the chromatic frequency domain. The SMSF defined in this domain is analogous to the CSF or the TMTF, which are defined in the spatial and temporal domains, respectively.1-3 We have studied how HVS processes chromatic information of daylight and natural objects. The analysis of the original and filtered colour signal with different cut-off frequencies reveals some degree of degradation of these colour signals. This is particularly important when the colour signal are characterised by peaked spectral power distributions.

关键词： Color image processing

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A role of burst firings of hindbrain neurons in detecting object distance in electrolocation 9

A role of burst firings of hindbrain neurons in detecting ob...

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9th International conference on Neural Information processing, ICONIP 2002

作者： Murase, E. Kashimori, Y. Zheng, MeiHong Kambara, T. Department of Information Network Science School of Information Systems University of Electro-Communications ChofuTokyo182-8585 Japan Division of Bioinfomatics Department of Applied Physics and Chemistry University of Electro-Communications ChofuTokyo182-8585 Japan

ISBN: (纸本)9810475241

Weakly electric fish generates electric field around its body using electric organ discharge and can accurately detect the location of an object using the modulation of electric field induced by an object. Objects with electric properties different from those of the surrounding water distort the electric field around fish's body depending on the size, distance and electric properties of objects. It is not clear yet how the fish recognizes the properties of an object such as its electric property, location and size based on its electric image. As the first step to clarify the neuronal mechanism of electrolocation, we developed a model of fish body by which we describe numerically the spatio-temporal patterns of electric field around the fish body. We made also neural models of electroreceptors distributed on the fish body and of electrosensory lateral line lobe (ELL) to investigate what kinds of information of electric field distorted by an object they detect. The models reproduce qualitatively the experimental results about the detections of size, distance, and moving directions of an object. We show that the lateral distance between a moving object and fish is encoded by the synchronous burst firing of ELL neurons, reflecting the spatio-temporal correlations of EOD stimuli received by the receptors. © 2002 Nanyang Technological University.

关键词： Fish

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An Efficient Approach to the Reduction of Mosquito Noise for the JPEG/JPEG2000 Decoded image by Using Epsilon Filter

An Efficient Approach to the Reduction of Mosquito Noise for...

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IS and T's NIP18: International conference On Digital Printing Technologies

作者： Shohdohji, Tsutomu Sasaki, Yohsuke Hoshino, Yasushi Nippon Institute of Technology Saitama Japan ANDOR System Support Co. Ltd. Shinagawa Tokyo Japan

The JPEG (joint photographic experts group) compression algorithm is possible to decode an image effectively, by considering the visual characteristic of human beings. The mosquito noise generates in the block, when a compression rate of the JPEG is high. On the other hand, the block noise is not generated in the JPEG2000 decoded image because an algorithm of the JPEG2000 based on DWT (discrete wavelet transform). However, the mosquito noise appears to a high compressed image by using the JPEG2000. We lose not only the mosquito noise but also some important image information, when the usual noise reduction filter is applied for a JPEG/JPEG2000 decoded image including the mosquito noise. As a result, the image quality worsens. In this paper, we propose an efficient algorithm which reduces the mosquito noise of the JPEG/JPEG2000 decoded image by using Ε-filter. We confirmed that our proposed method was effective by the computer experiments.

关键词： image processing

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Satellite image restoration filter comparison

Satellite image restoration filter comparison

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conference on Applications of Digital image processing XXV

作者： Arbel, D Kopeika, NS Ben Gurion Univ Negev Dept Elect & Comp Engn IL-84105 Beer Sheva Israel

ISBN: (纸本)0819445576

The quality of satellite images propagating through the atmosphere is affected by phenomena such as scattering and absorption of the fight, and turbulence, which degrade the image by blurring it and reducing its contrast. Here, a new approach for digital restoration of Landsat thematic mapper (TM) imagery is presented by implementing several filters as atmospheric filters which correct for turbulence blur, aerosol blur, and path radiance simultaneously. Aerosol modulation transfer function (MTF) is consistent with optical depth. Turbulence MTF is calculated from meteorological data. The product of the two yields atmospheric MTF, which is implemented in the atmospheric filters. Restoration improves both smallness of size of resolvable detail and contrast. Restorations are quite apparent even under clear weather conditions. Different restoration results are obtained by trying to restore the degraded image. Here, restorations results of the Kalman filter and the atmospheric Wiener filter are presented along with restoration results based on wavelets and multifractals. A way to determine which is the best restoration result and how good is the restored image is presented by a visual comparison and by examining several mathematical criteria.

关键词： adjacency effect aerosol blur atmospheric Wiener filter contrast enhancement Kalman filter multifractals modulation transfer function (MTF) optical depth (thickness) turbulence blur wavelets

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Instrumental Analysis of Gloss and Micro-Gloss Variations in Printed images

Instrumental Analysis of Gloss and Micro-Gloss Variations in...

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Final Program and Proceedings: IS and T's 55th Annual conference

作者： Arney, Jonathan S. Michel, James Pollmeier, Klaus Rochester Institute of Technology Rochester NY George Eastman House Rochester NY

Gloss characteristics of printed images contribute significantly to visual image quality. However, traditional gloss instruments provided limited information about first surface optical characteristics of printed materials. In the current work, several new instrumental techniques for characterizing gloss and gloss variations in printed images have been developed. These instruments use a radiometrically calibrated digital camera to capture gloss images of printed surfaces that can be resolved spatially to provide micro-gloss information. The unique characteristics of the instrument is in the illumination optics. Illumination is not done with a traditional collimated source at an equal/opposite angle. Rather, the illumination system modulates the light spatially in such a way that much more quantitative information about gloss can be extracted from the images. The instrument quantitatively separates diffusely reflected light from the first surface light. The first surface gloss can then be related quantitatively to the physical topography of the surface.

关键词： image quality

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Analysis of myocardial motion in tagged MR images using nonrigid image registration

Analysis of myocardial motion in tagged MR images using nonr...

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Medical Imaging 2002 conference

作者： Chandrashekara, R Mohiaddin, RH Rueckert, D Univ London Imperial Coll Sci Technol & Med Dept Comp Visual Informat Proc Grp London SW7 2BZ England

ISBN: (纸本)0819444294

Tagged magnetic resonance imaging (MRI) is unique in its ability to non-invasively image the motion and deformation of the heart in-vivo, but one of the fundamental reasons limiting its use in the clinical environment is the absence of automated tools to derive clinically useful information from tagged MR images. In this paper we present a novel and fully automated technique based on nonrigid image registration using mufti-level free-form deformations (MFFDs) for the analysis of myocardial motion using tagged MRI. The novel aspect of our technique is its integrated nature for tag localization and deformation field reconstruction. To extract the motion field within the myocardium during systole we register a sequence of images taken during systole to a set of reference images taken at end-diastole, maximizing the mutual information between images. We use both short-axis and long-axis images of the heart to estimate the full four-dimensional motion field within the myocardium. We have validated our method using a cardiac motion simulator and we also present quantitative comparisons of cardiac motion from nine volunteers.

关键词： cardiac motion analysis image registration tagged MRI mutual information

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A new-style defect inspection system of film

A new-style defect inspection system of film

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conference on Optical Manufacturing Technologies

作者： Liang, Y Liu, WY Liu, M Lee, RG Tianjin Univ Coll Precis Instruments & Optoelect Engn Tianjin 300072 Peoples R China

ISBN: (纸本)0819447102

An inspection system has been developed for on-line detection of film defects, which bases on combination of photoelectric imaging and digital image processing. The system runs in high speed of maximum 60m/min. Moving film is illuminated by LED array which emits even infrared (peak wavelength lambda(p)=940nm), and infrared images are obtained with a high quality and high speed CCD camera. The application software based on visual C++6.0 under Windows processes images in real time by means of such algorithms as median filter, edge detection and projection, etc. The system is made up of four modules, which are introduced in detail in the paper. On-line experiment results shows that the inspection system can recognize defects precisely in high speed and run reliably in practical application.

关键词： on-line inspection film defect infrared imaging digital image processing

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