{"title":"Using the red chromaticity for illumination estimation","authors":"Nikola Banić, S. Lončarić","doi":"10.1109/ISPA.2015.7306046","DOIUrl":"https://doi.org/10.1109/ISPA.2015.7306046","url":null,"abstract":"Achieving color invariance to illumination is known as color constancy and it is implemented in most digital cameras. There are statistics-based and learning-based computational color constancy methods and the latter ones are known to be more accurate. For a given image these methods extract some features and since for some methods calculating and processing these features can be computationally demanding, this renders such methods slow and very often impractical for hardware implementation. In this paper simple, yet very powerful features for color constancy based on the red chromaticity are presented. A new color constancy method is proposed and it is demonstrated how an existing one can be simplified. In both cases state-of-the-art results are achieved. The results are presented and discussed and the source code is available at http://www.fer.unizg.hr/ipg/resources/color constancy/.","PeriodicalId":299846,"journal":{"name":"2015 9th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114467259","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":"An amplitude constrained FxLMS algorithm for narrow-band active noise control applications","authors":"F. Faccenda, L. Novarini","doi":"10.1109/ISPA.2015.7306064","DOIUrl":"https://doi.org/10.1109/ISPA.2015.7306064","url":null,"abstract":"Annoying noises generated by industrial equipment (such as engines, transformers, fans, etc.) might persist in some environment, resulting in a comfort decrease for people present in that area. Active noise control solutions could improve environment sound quality significantly, especially at low frequencies where standard passive solutions would be much bulky and expensive. Narrow-band approaches have been widely discussed in the past because of their simplicity and effectiveness in the cancellation of tonal noises. In this paper the authors propose a novel adaptive algorithm based on narrow-band Filtered-x Least Mean Square algorithm which, instead of adapting two taps per tone simultaneously, updates only one tap at a time and derives the other one from the knowledge of the adapted tap and the a-priori known amplitude of the disturbing tone. Proposed solution implicitly prevents instability conditions of standard two-taps solutions, avoiding consequent high comfort deterioration and hardware breakups. Experimental simulations have been carried out to show proposed algorithm behaviors under stress conditions, proving that its performances are comparable with those of classic narrow-band algorithm.","PeriodicalId":299846,"journal":{"name":"2015 9th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134097287","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":"Finiteness of chain-code picture languages on the triangular grid","authors":"Gergely T. Balint, B. Nagy","doi":"10.1109/ISPA.2015.7306078","DOIUrl":"https://doi.org/10.1109/ISPA.2015.7306078","url":null,"abstract":"Chain-code picture systems are Lindenmayer-systems over special alphabets. The generated words are interpreted as chain-code pictures containing vertices and edges of the regular triangular grid. The finiteness of various chain-code picture languages are investigated based on properties of length-contracting, length-constant and length-expanding sD0L parallel rewriting systems. The case of shuffled axioms is also explored.","PeriodicalId":299846,"journal":{"name":"2015 9th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115067394","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}
G. Apou, F. Feuerhake, G. Forestier, B. Naegel, Cédric Wemmert
{"title":"Synthesizing whole slide images","authors":"G. Apou, F. Feuerhake, G. Forestier, B. Naegel, Cédric Wemmert","doi":"10.1109/ISPA.2015.7306050","DOIUrl":"https://doi.org/10.1109/ISPA.2015.7306050","url":null,"abstract":"The increasing availability of digital whole slide images opens new perspectives for computer-assisted image analysis complementing modern histopathology, assuming we can implement reliable and efficient image analysis algorithms to extract the biologically relevant information. Both validation and supervised learning techniques typically rely on ground truths manually made by human experts. However, this task is difficult, subjective and usually not exhaustive. This is a well-known issue in the field of biomedical imaging, and a common solution is the use of artificial “phantoms”. Following this trend, we study the feasibility of synthesizing artificial histological images to create perfect ground truths. In this paper, we show that it is possible to generate a synthetic whole slide image with reasonable computing resources, and we propose a way to evaluate its quality.","PeriodicalId":299846,"journal":{"name":"2015 9th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"1958 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128831624","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}
A. Kesidis, N. Vassilas, T. Tsenoglou, D. Ghazanfarpour
{"title":"Experimental sensitivity investigation of mean-shift variants to bandwidth parameters for 3D buildings reconstruction","authors":"A. Kesidis, N. Vassilas, T. Tsenoglou, D. Ghazanfarpour","doi":"10.1109/ISPA.2015.7306043","DOIUrl":"https://doi.org/10.1109/ISPA.2015.7306043","url":null,"abstract":"The goal of this work is to investigate on the one hand the sensitivity of three variants of the joint mean shift algorithm to the choice of the bandwidth parameters and on the other hand their upsampling capabilities in the area of 3D buildings reconstruction. In particular, we examined the quality of upsampled 3D building models obtained by fusing high resolution image data with low resolution elevation data acquired from airborne scanners from densely built urban areas. Using the root mean square error (RMSE) criterion computed between the actual upsampled result and a ground truth, prototype, 3D model, we provide both qualitative and quantitative comparative results. Discussion following the experimental section gives some insight to the observation that the spatially restricted joint mean shift seems to outperform the other two variants.","PeriodicalId":299846,"journal":{"name":"2015 9th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128622290","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 slope streak detection on Mars","authors":"F. Puga, E. Silva, P. Pina","doi":"10.1109/ISPA.2015.7306040","DOIUrl":"https://doi.org/10.1109/ISPA.2015.7306040","url":null,"abstract":"An algorithm to detect slope streaks on Mars is presented in this paper. It is mainly based on morphological operators and consists of three steps: `pre-processing' with connected operators to filter small structures and shadows, `detection' with top-hat, Otsu binarisation and thinning/pruning-reconstruction operations and by a `post-processing' to remove non-elongated objects. The algorithm is successfully tested on very high resolution images (0.25-6.5 m/pixel) of HiRISE and MOC cameras on different locations of Mars.","PeriodicalId":299846,"journal":{"name":"2015 9th International Symposium on Image and Signal Processing and Analysis (ISPA)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121597170","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}