Gianfranco Garipoli, C. Bonanomi, Davide Gadia, A. Rizzi, L. Albani
{"title":"Tuning a computer based stereo blindness assessment","authors":"Gianfranco Garipoli, C. Bonanomi, Davide Gadia, A. Rizzi, L. Albani","doi":"10.1109/ISPA.2013.6703790","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703790","url":null,"abstract":"Previous studies on stereoscopic acuity have shown that the percentage of stereo blind subjects is relevant. Therefore, there is the need of performing a stereo blindness and stereo acuity test before each visualization session involving stereoscopic images. In this paper we propose a computer based test suitable for a generic stereo displays, with the aim of testing different visual parameters to design the most efficient test possible.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127833385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. Albani, Lode De Paepe, S. Bonfiglio, G. Guarnieri, G. Ramponi
{"title":"HDR medical display based on dual layer LCD","authors":"L. Albani, Lode De Paepe, S. Bonfiglio, G. Guarnieri, G. Ramponi","doi":"10.1109/ISPA.2013.6703794","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703794","url":null,"abstract":"There is increased interest in the visualization community to experiment the benefit of HDR presentation. Current developments in HDR displays are geared towards projecting more realistic images than conventional (non-HDR) displays. The dynamic range of the natural world is approximately 14 orders of magnitude while conventional displays are limited to at most 3 orders of magnitude in luminance. A high dynamic range based on Dual Layer liquid crystal display (LCD) is built by stacking two panels one on top of the other. In this way, the dynamic range is theoretically squared and the bit depth is also increased. However, in order to minimize the parallax and reconstruction errors, dedicated splitting algorithms are needed to generate the two images which drive the panels. Moreover, to cope with the reduce transmittance of this Dual Layer LCD concept, a high brightness backlight is required and new LED technology enable a reliable implementation.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115893041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Registration of satellite images based on road network map","authors":"J. Zaletelj, U. Burnik, J. Tasic","doi":"10.1109/ISPA.2013.6703713","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703713","url":null,"abstract":"This paper presents a novel approach to fully automatic satellite image registration to a local earth coordinate system based on the digital map of the road network. Automatic satellite image co-registration methods typically establish correspondences between points on the target and registered image using local image features such as SIFT, however they are not effective for multi-temporal and multi-sensor registration. As the road network is a prominent feature on the satellite images and is visible in most circumstances, we propose to map it directly to the digital road network topographic map, which is readily available in GIS databases. Our approach starts by detection of road segments in a satellite image, producing a road mask image. Small road mask patches are matched against rasterized road network map to find a set of probable patch locations. Following optimization of translation parameters, each satellite image tile is coarsely located on a road map. In a second fine optimization step, smaller road patches locations are further optimized. The algorithm produces a set of tie points, which include coordinates of satellite image pixels within local metric coordinate system. Experiments were performed on a set of 5 RapidEye images of Slovenia from different periods of the year. The results show that the average error of the points is below 1 pixel for all images, and that the reliability in terms of outlier pixels is very high.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124222495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Soudah, M. Bordone, Marcelino Rodriguez, Jorge S. Perez, C. Li, F. Carreras
{"title":"Data analisis of 4D phase contrast MRI in healthy and non-healthy patients","authors":"E. Soudah, M. Bordone, Marcelino Rodriguez, Jorge S. Perez, C. Li, F. Carreras","doi":"10.1109/ISPA.2013.6703798","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703798","url":null,"abstract":"Time-resolved, 3-dimensional phase-contrast magnetic resonance imaging (3D+t PCMRI) is employed to obtain complete spatial and temporal coverage of the vessels blood combined with spatially registered 3-directional pulsatile blood flow velocities[1][2]. Recent studies have reported that Wall Shear Stress (WSS) quantification from PCMRI are able to use the WSS as biomarkers for different aortas pathologies [3]. Figure [1] shows the pathline visualization of blood flow during one cardiac cycle in the heart of a healthy patient at peak early LV filling, diastasis, peak atrial contraction, and peak systole.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124597999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Automatic detection of headlines in temporally aggregated TV sports news videos","authors":"K. Choros","doi":"10.1109/ISPA.2013.6703730","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703730","url":null,"abstract":"Internet video collections, TV shows archives, video-on-demand systems, video libraries, personal video archives offered in the Web, etc. store more and more amount of digital video data. Therefore, new methods for automatic indexing and retrieval of video data are being developed, new technologies are being proposed. Due to a huge commercial appeal the TV sports news has become one of the dominant application areas for video automatic indexing and retrieval. Content-based indexing of TV sports news usually starts by the automatic segmentation, then recognition and classification of scenes reporting sports events. The detection of video structure, not only of the simplest structural elements like frames or shots but also of video scenes, leads to the optimization of indexing process. The automatic identification of sports disciplines in TV sports news will be less time consuming if the analyzed video material is limited to player scenes included in news headlines. The temporal aggregation process facilitates the detection of headline shots. The paper presents a method of automatic detection of sports news headlines for content-based indexing of TV sports news based on video structure information.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130864719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A generalized class of lattice wave digital filters","authors":"T. Saramäki, M. Ahsan, Harri Liedes, M. Renfors","doi":"10.1109/ISPA.2013.6703780","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703780","url":null,"abstract":"The class of lattice wave digital (LWD) filters, which are constructed as a parallel connection of two all-pass branches, is extended beyond the known lowpass, highpass, bandpass, and bandstop designs. The goal is to generate a generic design procedure for LWD filters having an arbitrary number of interlaced passbands and stopbands such that such that in each passband and stopband the magnitude criteria are the most arbitrary. For this purpose, the overall design is governed by the phase response behaviors of the two all-pass filters and, in addition, the rules are established for the behavior of their unwrapped phase difference such that all the feasible patterns of phase transitions between consecutive bands are included. Among these patterns, only one results in the best LWD filter solution. These extensions provide significantly more degrees of freedom for synthesizing many novel LDF filters. Very concrete novel filters not being synthesizable using traditional techniques are bandpass and bandstop filters, for which the orders of both branches are the same, and, thereby, the overall order is two times an even integer. The above extended properties of LWD filters are brought to reality by properly generalizing the Remez algorithm proposed earlier by two authors of this paper for determining the above-mentioned phase difference such that it minimizes in the Chebyshev sense a given weighted error function on a close subset of [0, π]. Four examples are included to demonstrate the use of the proposed overall synthesis scheme and the novelty of the resulting LWD filters.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126612092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kristína Lidayová, Joakim Lindblad, Natasa Sladoje, H. Frimmel
{"title":"Coverage segmentation of thin structures by linear unmixing and local centre of gravity attraction","authors":"Kristína Lidayová, Joakim Lindblad, Natasa Sladoje, H. Frimmel","doi":"10.1109/ISPA.2013.6703719","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703719","url":null,"abstract":"We present a coverage segmentation method for extracting thin structures in two-dimensional images. These thin structures can be, for example, retinal vessels, or microtubules in cytoskeleton, which are often 1-2 pixels thick. There exist several methods for coverage segmentation, but when it comes to thin and long structures, the segmentation is often unreliable. We propose a method that does not shrink the structures inappropriately and creates a trustworthy segmentation. In addition, as a by-product a high-resolution crisp reconstruction is provided. The method needs a reliable crisp segmentation as an input and uses information from linear unmixing and the crisp segmentation to create a high-resolution crisp reconstruction of the object. After a procedure where holes and protrusions are removed, the high-resolution crisp image is optionally downsampled back to its original size, creating a coverage segmentation that preserves thin structures.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114149145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A new perspective on the convergence and stability of NLMS Hammerstein filters","authors":"E. Batista, R. Seara","doi":"10.1109/ISPA.2013.6703764","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703764","url":null,"abstract":"This paper is devoted to the analysis of the convergence and stability of adaptive Hammerstein filters using the normalized least-mean-square (NLMS) algorithm. Such an analysis provides a new perspective on the update process of Hammerstein filters by focusing on the simultaneous update of the two cascaded structures (nonlinearity and linear filter) composing these filters. In this context, it is shown that the impact of the simultaneous update, which is often overlooked in the open literature, is of fundamental importance for choosing the adaptive algorithm parameters and, thus, to ensure the algorithm stability and obtain faster convergence. Simulation results confirm the effectiveness of the design guidelines obtained using the proposed analysis approach.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116569300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A real-time simulcast multi-view wavelet video coding based on skipping of spatial subbands","authors":"E. Belyaev, K. Egiazarian, M. Gabbouj","doi":"10.1109/ISPA.2013.6703745","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703745","url":null,"abstract":"In this paper a real-time simulcast multi-view video coding based on three-dimensional discrete wavelet transform (3D DWT) is considered. An efficient rate-distortion criterion of skipping spatial subbands is proposed. A processing of subbands is done in a group of frames from low frequency to high-frequency temporal subbands and from low frequency to high-frequency spatial subbands. If for the processed subband in the current view it appears to be more efficient not to include the highest significant bit-plane into the output bit stream, then all the corresponding temporal and spatial child subbands are skipped without any calculations of 2-D wavelet transforms and entropy encoding. Moreover, all corresponding spatial subbands in sequel views (with its child subbands) are skipped as well. Simulations results have demonstrated that the 3-D DWT codec with the proposed skipping rule has much lower computational complexity (from 2 up to 8 times) for the same quality level compared to the H.264/AVC standard in the low complexity mode.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122614131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Automatic petrographic feature extraction from pottery of archaeological interest","authors":"G. Puglisi, F. Stanco, G. Barone, P. Mazzoleni","doi":"10.1109/ISPA.2013.6703801","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703801","url":null,"abstract":"The concept of fabric, defined by the description and classification method introduced by Whitbread (1995), has been usually used to perform petrographic studies of thin sections of ancient ceramics. This work analyzes pottery of archaeological interest by making use of image processing algorithms. First a preliminary petrographic analysis has been quantitatively performed by point counter stage. Afterward our attention has been focused on the automatic identification of structural and textural components of the potteries through optical microscopy. Image analysis techniques have been then used to automatically classify the image component into three classes: inclusions, voids and groundmass. Preliminary results, confirm the effectiveness of the proposed approach: petrographic data collection becomes faster with respect to traditional method providing also quantitative information useful for fabric recognition.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131608682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}