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Exudate segmentation on retinal atlas space 视网膜图谱空间的渗出物分割
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-04 DOI: 10.1109/ISPA.2013.6703828
Sharib Ali, K. M. Adal, D. Sidibé, T. Karnowski, E. Chaum, F. Mériaudeau
{"title":"Exudate segmentation on retinal atlas space","authors":"Sharib Ali, K. M. Adal, D. Sidibé, T. Karnowski, E. Chaum, F. Mériaudeau","doi":"10.1109/ISPA.2013.6703828","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703828","url":null,"abstract":"Diabetic macular edema is characterized by hard exudates. Presence of such exudates cause vision loss in the affected areas. We present a novel approach of segmenting exudates for screening and follow-ups by building an ethnicity based statistical atlas. The chromatic distribution in such an atlas gives a good measure of probability of the pixels belonging to the healthy retinal pigments or to the abnormalities (like lesions, imaging artifacts etc.) in the retinal fundus image. Post-processing schemes are introduced in this paper for the enhancement of the edges of such exudates for final segmentation and to separate lesion from false positives. A sensitivity(recall) of 82.5 % at 35% of positive predictive value on FROC-curve is achieved. Results are obtained on a publicly available HEI-MED dataset and have been compared to two reference methods on the same dataset showing the competitiveness of the proposed algorithm.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133279245","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}
引用次数: 5
Can we date an artist's work from catalogue photographs? 我们能从目录照片中确定艺术家作品的年代吗?
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-04 DOI: 10.1109/ISPA.2013.6703803
Alexander David Brown, G. Roderick, Hannah M. Dee, Lorna M. Hughes
{"title":"Can we date an artist's work from catalogue photographs?","authors":"Alexander David Brown, G. Roderick, Hannah M. Dee, Lorna M. Hughes","doi":"10.1109/ISPA.2013.6703803","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703803","url":null,"abstract":"Computer vision has addressed many problems in art, but has not yet looked in detail at the way artistic style can develop and evolve over the course of an artist's career. In this paper we take a computational approach to modelling stylistic change in the body of work amassed by Sir John “Kyffin” Williams, a nationally renowned and prolific Welsh artist. Using images gathered from catalogues and online sources, we use a leave-one-out methodology to classify paintings by year; despite the variation in image source, size, and quality we are able to obtain significant correlations between predicted year and actual year, and we are able to guess the age of the painting within 15 years, for around 70% of our dataset. We also investigate the incorporation of expert knowledge within this framework by consdering a subset of paintings chosen as exemplars by a scholar familiar with Williams' work.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116088534","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}
引用次数: 1
Design space exploration of high level stream programs on parallel architectures: A focus on the buffer size minimization and optimization problem 并行架构上高级流程序的设计空间探索:关注缓冲区大小最小化和优化问题
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703835
S. Brunet, C. Alberti, M. Mattavelli, J. Janneck
{"title":"Design space exploration of high level stream programs on parallel architectures: A focus on the buffer size minimization and optimization problem","authors":"S. Brunet, C. Alberti, M. Mattavelli, J. Janneck","doi":"10.1109/ISPA.2013.6703835","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703835","url":null,"abstract":"This paper presents a dataflow design methodology and an associated co-exploration environment, focusing on the optimization of buffer sizes. The approach is applicable to dynamic dataflow designs and its performance is presented and validated by experimental results on the porting of an MPEG-4 Simple Profile decoder to the STM STHORM manycore platform. For the purpose of this work, the decoder has been written using the RVC-CAL dataflow language standardized by ISO/IEC. Starting from this high-level representation it is demonstrated how the buffer size configuration can be optimized, based on a novel buffer size minimization algorithm suitable for a very general class of dataflow programs.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"89 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":"124399773","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}
引用次数: 9
A low-complexity robust estimation of multiple wideband polynomial-phase signals in sensor array 传感器阵列中多宽带多项式相位信号的低复杂度鲁棒估计
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703758
S. Djukanović, M. Simeunović, I. Djurović
{"title":"A low-complexity robust estimation of multiple wideband polynomial-phase signals in sensor array","authors":"S. Djukanović, M. Simeunović, I. Djurović","doi":"10.1109/ISPA.2013.6703758","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703758","url":null,"abstract":"This paper addresses joint estimation of parameters of multiple polynomial-phase signals (PPSs) impinging on a sensor array and corresponding direction-of-arrivals (DOAs). Using a recently proposed method for the fine estimation of multiple PPSs, we first separate signal components and then estimate the parameters of interest from the spatial high-order instantaneous moments (SHIMs) of the obtained components. The parameter estimation is performed through maximizing the spectrum obtained by averaging the spectra of multiple rows and columns of the SHIM matrix. The proposed approach offers lower signal-to-noise ratio (SNR) threshold and higher accuracy with respect to concurrent methods. Since all parameters are estimated through 1-D searches, the calculation complexity is significantly reduced with respect to the maximum likelihood (ML) methods.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"75 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":"124267872","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}
引用次数: 4
Automatic exposure and white balance control in video cameras: Time course characterization and preference 摄像机中的自动曝光和白平衡控制:时间过程特性和偏好
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703709
M. Nuutinen, Valtteri Valkonen, P. Oittinen, T. Virtanen
{"title":"Automatic exposure and white balance control in video cameras: Time course characterization and preference","authors":"M. Nuutinen, Valtteri Valkonen, P. Oittinen, T. Virtanen","doi":"10.1109/ISPA.2013.6703709","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703709","url":null,"abstract":"On a coarse level the lightness and chromatic adaptation of the human visual system (HVS) and signal processing in a video camera are comparable processes. Both adapt to changes in lighting environment and are time dependent. This study developed metrics for characterizing time-course of automatic exposure (AE) and white balance (AWB) controls in video cameras. To evaluate subjective preference for AE and AWB videos, specific scenes with natural lighting changes were designed. Our results show that the subjective preference AE time course is fast and without overshoot. In addition preference speed for the time-course of AWB was about six seconds for videos used in this study.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"25 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":"127499815","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}
引用次数: 2
Experimental setup and methodology for automatic quality assessment of intraocular lenses 人工晶状体质量自动评估的实验设置和方法
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703824
Andrea Cigaina, G. Fenu, F. A. Pellegrino, P. Sirotti, S. Rinaldi, D. Tognetto
{"title":"Experimental setup and methodology for automatic quality assessment of intraocular lenses","authors":"Andrea Cigaina, G. Fenu, F. A. Pellegrino, P. Sirotti, S. Rinaldi, D. Tognetto","doi":"10.1109/ISPA.2013.6703824","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703824","url":null,"abstract":"Intraocular lenses (IOLs) are widely used in cataract surgery. There is a variety of IOLs depending on lens material, optical and mechanical design. Evaluation of the visual performance obtainable with intraocular lenses is important for objective comparison between IOL models. Indeed, the visual performance of implanted lenses has a deep impact on the life of the subjects, having medical, social and economical consequences. The purpose of the present paper is twofold: first, we propose an experimental setup, consisting of an actuated opto-electro-mechanical eye capable of simulating different refractive and optical conditions. Second, we suggest to employ some well-known image quality assessment tools for evaluating the visual performance of different IOLs (or of the same IOL in different conditions) based on the comparison between the original image and that produced by the artificial eye equipped with the IOL. The objective and repeatable results obtained, are in accordance with subjective evaluation (a time-consuming procedure employed in previous works).","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":"116552508","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}
引用次数: 0
Towards run-time actor mapping of dynamic dataflow programs onto multi-core platforms 面向多核平台动态数据流程序的运行时actor映射
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703834
H. Yviquel, E. Casseau, M. Raulet, P. Jääskeläinen, J. Takala
{"title":"Towards run-time actor mapping of dynamic dataflow programs onto multi-core platforms","authors":"H. Yviquel, E. Casseau, M. Raulet, P. Jääskeläinen, J. Takala","doi":"10.1109/ISPA.2013.6703834","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703834","url":null,"abstract":"The emergence of massively parallel architectures, along with the necessity of new parallel programming models, has revived the interest on dataflow programming due to its ability to express concurrency. Although dynamic dataflow programming can be considered as a flexible approach for the development of scalable applications, there are still some open problems in concern of their execution. In this paper, we propose a low-cost mapping methodology to map dynamic dataflow programs over any multi-core platform. Our approach finds interesting mapping solutions in few milliseconds that makes it doable at regular time by translating it in an equivalent graph partitioning problem. Consequently, a good load balancing over the targeted platform can be maintained even with such unpredictable applications. We conduct experiments across three MPEG video decoders, including one based on the new High Efficiency Video Coding standard. Those dataflow-based video decoders are executed on two different platform: A desktop multi-core processor, and an embedded platform composed of interconnected and tiny Very Long Instruction Word - style processors. Our entire design flow is based on open-source tools. We present the influence of the number of processors on the performance and show that our method obtains a maximum decoding rate for 16 processors.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"15 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":"123026924","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}
引用次数: 20
Contrast-based surface saliency 基于对比的表面显著性
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703741
Yitian Zhao, Yonghuai Liu
{"title":"Contrast-based surface saliency","authors":"Yitian Zhao, Yonghuai Liu","doi":"10.1109/ISPA.2013.6703741","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703741","url":null,"abstract":"The detection of salient regions is an important preprocessing step for the analysis of mesh surfaces. The detected salient region is a reflection of perception-based regional importance for surfaces. It finds many 3D applications, such as mesh simplification, registration, segmentation and compression. In this paper we propose a novel method for the detection of saliency in a 3D surface. Our method incorporates the bilateral normal filtering, shape index and Retinex to generate the surface contrast, then produces vertex-based and region-based contrast saliencies. The effectiveness of this method is demonstrated by visual observation of detected salient regions. Also, the applications of saliency-guided interest points detection and saliency-guided simplification are demonstrated to validate the proposed method. In addition, the criterion to validate the proposed method is the repeatability of the salient points and surface simplificaition errors. A large number of the experiments have been performed over real data and the results demonstrate that the proposed approach has achieved better results than competitors.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"15 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":"114125619","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}
引用次数: 0
On the reference signal parameters in the cross wigner-ville distribution based instantaneous frequency estimation method 基于交叉维格纳-维尔分布的参考信号参数瞬时频率估计方法
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703778
D. Malnar, V. Sucic
{"title":"On the reference signal parameters in the cross wigner-ville distribution based instantaneous frequency estimation method","authors":"D. Malnar, V. Sucic","doi":"10.1109/ISPA.2013.6703778","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703778","url":null,"abstract":"Discussion on the reference signal (RS) and the related parameters in the recently proposed Cross Wigner-Ville distribution (XWVD) based method for the signal components instantaneous frequency (IF) estimation is presented. By a convenient choice of the reference signal, cross-terms are formed in such a way that the XWVD between the analyzed signal (AS) and a reference signal (RS) yields a scaled image closely resembling the IF laws of the signal components. Following strict geometrical rules that govern interferences and relying on a reference signal for providing a well localized point in time-frequency plane, the time-frequency coordinates of the component IFs can be calculated in an automatic procedure. The effects of the reference signal's parameters on the method's performance are discussed and examples are given for various choices of the RS's parameters.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"186 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":"114260650","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}
引用次数: 1
Ridgelet-DTW-based word spotting for Arabic historical document 基于ridgelet - dtw的阿拉伯语历史文献单词识别
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703738
Youcef Brik, Y. Chibani, Et-Tahir Zemouri, A. Sehad
{"title":"Ridgelet-DTW-based word spotting for Arabic historical document","authors":"Youcef Brik, Y. Chibani, Et-Tahir Zemouri, A. Sehad","doi":"10.1109/ISPA.2013.6703738","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703738","url":null,"abstract":"In this paper we propose a system for word spotting in Arabic historical document using Ridgelet transform and Dynamic Time Warping (DTW). First, a preprocessing and segmentation processes are applied to all document pages to create a word image dataset. Keeping each word into its original size, Ridgelet descriptor is generated without applying the normalization criteria for Radon transform, where the rotation, translation and scaling invariance is achieved. Therefore, DTW algorithm is employed to match corresponding projection angle pairs from Ridgelet descriptor, while avoiding problems associated with dimensionality reduction of descriptor sets into one vector which cause a loss of useful information. Experiments were conducted on historical Arabic document from the National library. The obtained results showed the effectiveness of the proposed method.","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":"117068514","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}
引用次数: 4
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