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2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)最新文献

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Informed coding for color hardcopy watermarking 彩色硬拷贝水印的知情编码
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703756
J. Mayer, S. Simske
{"title":"Informed coding for color hardcopy watermarking","authors":"J. Mayer, S. Simske","doi":"10.1109/ISPA.2013.6703756","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703756","url":null,"abstract":"We investigate informed coding and multi-bit spread spectrum modulation framework for watermarking color images intended to be deployed as printed media. We propose improvements on the embedding and the detection watermarking techniques, aiming for improved color hardcopy watermarking using inkjet printers. The modulation approach allows to increase the watermarking robustness to achieve high payload with good transparency. At the encoding phase the impact of the color background on the detection metric is evaluated based on the estimated ink color correlation between the watermark and the document. This correlation is used to estimate and compare the robustness of sets of patterns which would be otherwise considered equivalent for modulating the same message. This approach allows a proper selection of a set of sequences to be embedded for improved robustness. The detection is further improved by using a proposed whitening filter and a color rejection algorithm. Examples using real life images illustrate the performance enhancement achievable by employing the proposed approaches in color hardcopy watermarking systems.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"47 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":"131825281","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
An object-based tomographic recostruction algorithm exploiting interest points in image projections 一种利用图像投影中兴趣点的基于目标的层析重建算法
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703811
S. Brocchi
{"title":"An object-based tomographic recostruction algorithm exploiting interest points in image projections","authors":"S. Brocchi","doi":"10.1109/ISPA.2013.6703811","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703811","url":null,"abstract":"In this paper we propose an algorithm for the reconstruction of binary images composed by geometrical objects, specifically formed by circles inside a ring. We studied how features of these objects are reflected onto the projections of the image itself, and how by an accurate analysis of the projections, even from a single direction, we can obtain a good amount of information about the position of the circles by searching for interest points. In this case, by computing the discrete derivatives of the projections we can often determine with precision the positions of the circles in the original image. We compared the experimental results of our procedure with previous works to prove how our algorithm obtains very promising results. Finally, we discuss how a similar approach could be extended to many other more complex classes of images that may describe real world applications.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"24 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":"134351653","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
Hierarchical sparse autoencoder using linear regression-based features in clustering for handwritten digit recognition 基于线性回归聚类特征的分层稀疏自编码器手写数字识别
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703736
Hai T. Phan, An T. Duong, Son T. Tran
{"title":"Hierarchical sparse autoencoder using linear regression-based features in clustering for handwritten digit recognition","authors":"Hai T. Phan, An T. Duong, Son T. Tran","doi":"10.1109/ISPA.2013.6703736","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703736","url":null,"abstract":"Recently, handwritten digit recognition using higher level features has got more promising results than conventional ones using intensity values, where the higher level features are considered as features of simple strokes in images. Although the state-of-the-art performance is very impressive, there is still room to improve better in both accuracy and computation complexity. In this paper, we propose a new feature based on linear regression to extract geometrical characteristics of handwritten digits. The linear regression-based features are utilized to cluster set of digit image in preprocessing. After that, each set of clustered digit images is inputted a hierarchical sparse autoencoder to extract higher level features automatically. Our method result achieves error rates lower than that of conventional method in the most of cases. The experiment shows that the efficiency of data clustering can get promising results.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"5 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":"133435388","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
Evaluation of degraded images using adaptive Jensen-Shannon divergence 基于自适应Jensen-Shannon散度的退化图像评价
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703799
V. Bruni, D. Vitulano
{"title":"Evaluation of degraded images using adaptive Jensen-Shannon divergence","authors":"V. Bruni, D. Vitulano","doi":"10.1109/ISPA.2013.6703799","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703799","url":null,"abstract":"This paper investigates the properties of the Jensen-Shannon divergence for visual quality assessment. It will be shown that Jensen-Shannon divergence is a potential adaptive tool thanks to a good correlation with human perception, a reduced computational effort and a limited amount of information on the original image. In addition, it gives a score to visual quality in terms of bits and it has theoretical relationships with some well known and highly performing image quality assessment measures. Preliminary experimental results show the potential of the proposed measure in predicting the amount of degradation in the analysed image. This is a valid feature to successfully use in the preservation and restoration of archived material.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"49 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114006335","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
Sufficient condition for real-time non-preemptive scheduling of interactive multimedia tasks 交互式多媒体任务实时非抢占调度的充分条件
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703783
K. Lenac, E. Mumolo, M. Nolich
{"title":"Sufficient condition for real-time non-preemptive scheduling of interactive multimedia tasks","authors":"K. Lenac, E. Mumolo, M. Nolich","doi":"10.1109/ISPA.2013.6703783","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703783","url":null,"abstract":"In many fields, non-preemptive real-time scheduling of a set of periodic tasks with different release times is very important if not even necessary. The number and characteristics of tasks may vary during time, thus imposing to re-evaluate the task schedulability over time. In this paper we propose an efficient sufficient schedulability condition, and we analytically show that if this bound is satisfied, the tasks are real-time schedulable under the non-preemptive Earliest Deadline First and Rate Monotonic policies. We experimentally analyse, by simulation, the bound and show that in practical cases occurring in Multimedia processing its validity remains significant for a very large range of CPU utilisation factors. In the same way we show by simulation that the gap of the proposed condition to the sufficient and necessary condition is negligible if the difference between the periods of periodic tasks is small. Finally, we give a graphical interpretation of the proposed bound and some application examples.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"113 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":"115130569","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
IIR filter approximation of an innovative digital audio equalizer 一种创新的数字音频均衡器的IIR滤波器近似
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703776
M. Virgulti, S. Cecchi, F. Piazza
{"title":"IIR filter approximation of an innovative digital audio equalizer","authors":"M. Virgulti, S. Cecchi, F. Piazza","doi":"10.1109/ISPA.2013.6703776","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703776","url":null,"abstract":"Digital audio equalization is used to enhance the listening experience introducing corrections in the auditory frequency response. The equalizer performance depends on its implementation which includes optimal filters with sharp transition bandwidth development and a low computational complexity. Starting from a previous FIR implementation based on multirate systems and filterbanks theory, an optimized digital audio equalizer is derived. The proposed approach employs an approximation of the FIR structure using IIR filters, in order to improve the filterbanks structure developed to avoid interferences between adjacent bands. The effectiveness of the optimized implementation is shown comparing it with the previous approaches of the state of the art. The experimental results confirms that the presented solution has several advantages increasing the equalization performance in terms of low computational complexity, low delay, and uniform frequency response.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"64 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":"123166677","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
A new recursive controller for nonlinear active noise control 一种新的非线性主动噪声递归控制方法
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703816
G. Sicuranza, A. Carini
{"title":"A new recursive controller for nonlinear active noise control","authors":"G. Sicuranza, A. Carini","doi":"10.1109/ISPA.2013.6703816","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703816","url":null,"abstract":"In this paper, a new recursive linear-in-the-parameters nonlinear filter is presented. This filter is an extension of the even mirror Fourier nonlinear filter, so called because of the even symmetry of its trigonometric basis functions. The new recursive filter is used as a controller in a feedforward scheme exploited for active noise control to take into account simultaneously the nonlinearities, affecting in particular the secondary path, and the acoustic feedback between the loudspeaker and the reference microphone. Computer simulations confirm that the performance of the new controller is better than those of other standard recursive nonlinear controllers.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"114 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":"122015813","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
Normalized gradient fields and mutual information for motion correction of DCE-MRI images 归一化梯度场和互信息用于DCE-MRI图像的运动校正
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703795
E. Hodneland, A. Lundervold, J. Rørvik, A. Munthe-Kaas
{"title":"Normalized gradient fields and mutual information for motion correction of DCE-MRI images","authors":"E. Hodneland, A. Lundervold, J. Rørvik, A. Munthe-Kaas","doi":"10.1109/ISPA.2013.6703795","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703795","url":null,"abstract":"Dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) of the kidney typically displays spatial motion and undesired artefacts due to unavoidable patient movement and physiological pulsations, with the effect of corrupting voxel-wise signal intensity changes arising from contrast agent wash-in and wash-out. Image registration is a necessary tool to counteract such motion artefacts and to estimate physiological parameters reliably. In this work, we present a fluid-registration-based method for deformable multimodal image registration based on normalized gradients, particularly well suited to handle the motion challenges in DCE-MRI time series. We evaluate and confirm that both normalized gradients and mutual information are high-performing cost functionals for co-registration of DCE-MRI time series. Further, there are indications that normalized gradients have better performance than mutual information on this kind of images. These results promote normalized gradients as a promising tool for proper motion correction of DCE-MRI images applied in the clinic or in biomedical research.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"123 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":"126476501","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: 7
A study on DCT coefficients of time series pen position data for printed signature verification 用于打印签名验证的时间序列笔位数据DCT系数研究
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703726
T. Yoshida, Asami Hori, S. Hangai
{"title":"A study on DCT coefficients of time series pen position data for printed signature verification","authors":"T. Yoshida, Asami Hori, S. Hangai","doi":"10.1109/ISPA.2013.6703726","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703726","url":null,"abstract":"For the purpose of secure signature verification, it is preferable to use small sized feature data which is stable between genuine signatures and difficult to be mimicked by illegal transactions. Although the turning points extracted from XY position and pressure of pen is one of efficient feature data, they are not suitable for printed signatures written by Chinese or Japanese. This is because the signature consists of a number of segmented straight lines and has a fewer turning points than those of Western signatures. In order to reduce data size of printed signature, we have applied DCT (Discrete Cosine Transform) coefficients of time series XY position to signature verification. However, the DCT spectrum distance between genuine signatures acquired in different times is not small enough to accept. In this paper, we point out that the DCT spectrum distance of genuine signatures after DP matching becomes tremendously small and DCT spectra in low frequency domain has essential individuality. From experimental results using 20 Japanese persons, the 30 DCT spectra of Y position verifies the individuals with 1.7% EER(Equal Error Rate). This EER is similar with the results obtained by the signature verification system in which whole series data of XY position and pressure is used.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"50 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":"126693526","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
Estimation of sinusoidally modulated signal parameters based on the inverse Radon transform 基于Radon逆变换的正弦波调制信号参数估计
2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA) Pub Date : 2013-09-01 DOI: 10.1109/ISPA.2013.6703757
M. Daković, L. Stanković
{"title":"Estimation of sinusoidally modulated signal parameters based on the inverse Radon transform","authors":"M. Daković, L. Stanković","doi":"10.1109/ISPA.2013.6703757","DOIUrl":"https://doi.org/10.1109/ISPA.2013.6703757","url":null,"abstract":"A method for accurate and efficient parameters estimation and decomposition of sinusoidally modulated signals is presented. This kind of signals is of special interest in radars and communications. The proposed method is based on the inverse Radon transform property to transform a two-dimensional sinusoidal pattern into a single point in a two-dimensional plane. Theory is illustrated on signals with one and more components, including noise and disturbances, as well as time-frequency patterns that deviate from sinusoidal form, including the cases when some samples are not available.","PeriodicalId":425029,"journal":{"name":"2013 8th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"26 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":"127471527","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: 23
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