{"title":"Photometric Linearization under Near Point Light Sources","authors":"Satoshi Sato, K. Takata, K. Nobori","doi":"10.1093/ietisy/e89-d.7.2004","DOIUrl":"https://doi.org/10.1093/ietisy/e89-d.7.2004","url":null,"abstract":"We present a method for classifying image pixels of real images into multiple photometric factors: specular reflection, diffuse reflection, attached shadows and cast shadows. Conventional photometric linearization methods cannot correctly classify pixels under near point light sources, since they assume parallel light. To satisfy this assumption, our method utilizes a photometric linearization method that divides images into small regions. It also propagates linearization coefficients from neighboring regions. Our experimental results show that the proposed method can correctly classify image pixels into photometric factors, even if images are obtained under near point light sources.","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"59 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126963634","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":"Detecting Faces in Low-resolution Images","authors":"Shinji Hayashi, O. Hasegawa","doi":"10.1007/11612032_79","DOIUrl":"https://doi.org/10.1007/11612032_79","url":null,"abstract":"","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122017632","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":"Statistical Optimization for 3-D Reconstruction from a Single View","authors":"K. Kanatani, Y. Sugaya","doi":"10.1093/ietisy/e88-d.10.2260","DOIUrl":"https://doi.org/10.1093/ietisy/e88-d.10.2260","url":null,"abstract":"We analyze the noise sensitivity of the focal length computation, the principal point estimation, and the orthogonality enforcement for single-view 3-D reconstruction based on vanishing points and orthogonality. We point out that due to the nonlinearity of the problem the standard statistical optimization is not very effective. We present a practical compromise for avoiding the computational failure and preserving high accuracy, allowing a consistent 3-D shape in the presence of however large noise.","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125022480","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}
Hiroki Watanabe, H. Hongo, M. Yasumoto, Kazuhiko Yamamoto
{"title":"Detection and Estimation of Omni-Directional Pointing Gestures Using Multiple Cameras","authors":"Hiroki Watanabe, H. Hongo, M. Yasumoto, Kazuhiko Yamamoto","doi":"10.1541/IEEJEISS1987.121.9_1388","DOIUrl":"https://doi.org/10.1541/IEEJEISS1987.121.9_1388","url":null,"abstract":"We propose a multi-camera system that can detect omni-directional pointing gestures and estimate the direction of pointing. In general, when a human points at something, their target exists directly in front of the direction they are facing. Therefore, we regard the direction of pointing as the direction represented by the straight line that connects the face position with the hand position. First, the multiple cameras detect the face region by skin colors and estimate the face direction with the discrete face direction feature classes. Second, we estimate the precise direction that the subject is facing with the integrated information from multiple cameras and decide which camera captures the frontal view of the face the best. This camera is labeled the center camera. Third, we select a pair of cameras on both sides of the center camera as a stereo camera and detect the spatial positions of the face and hand. Finally, the target that the subject is pointing to is found on the straight line that connects the face position with the hand position. Experiments show that out system can achieve a mean error of 1.94\" with a variance of 4.37 throughout the pointing direction.","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122305055","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":"Robust Image Registration Using Selective Correlation Coefficient","authors":"Yutaka Sato, S. Kaneko, S. Igarashi","doi":"10.1541/ieejeiss1987.121.4_800","DOIUrl":"https://doi.org/10.1541/ieejeiss1987.121.4_800","url":null,"abstract":"Ve propose a new method for robust image registrat,ion called 'Selective Correlation Coefficient (SCC)' in order to search images under illconditioned illuminat,ion or partial occlusion. A correlation mask image is generated for selecting pixels of a image before matching. The mask image can be derived from a binary-coded increment sign image defined from any object image and the template image. The masking rate of occluded regions is theoretically expected to be 50%, while unoccluded regions have much lower rate than 50%. We realize robustness under ill-conditioned environment since inconsistent brightness of occluded regions can be omitted by the masking operation. We propose, furthermore, the mask expanding procedure to get more stable robustness. The effectiveness of probabilistic masking increases by the procedure, resulting the rate around 70% of masking of occluded regions. This paper includes a theoretical modeling and analysis of the proposed method and some experimental results with real images.","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129993949","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}
Tsuyoshi Yamaguchi, M. Tominaga, K. Murakami, H. Koshimizu
{"title":"Generating Facial Image Eye-Contacting with Partner on the TV Conference Environment","authors":"Tsuyoshi Yamaguchi, M. Tominaga, K. Murakami, H. Koshimizu","doi":"10.1142/9789812791993_0003","DOIUrl":"https://doi.org/10.1142/9789812791993_0003","url":null,"abstract":"We have been developing the method for facial part recognition such as eyes, nose, mouth, etc. This paper pays attention especially to eye (iris) recognition by I lough transform. Basing on this iris recognition, this paper proposes a basic idea and its method for re-generation of facial image which is eye-contacting with partner on the TV conference environment. Through this we propose a new methodology to realize a natural human interface of the face-to-face conimunication on the TV conference environment. Since human is likely to look at the face of his partner on TV monitor not at TV camera, he will usually fail to send his own eye-contacted facial images to him. The basic idea of this paper to improve this fatal cotnmunication degradation is to regenerate facial itnagc by changing the tlirt'clion of the irises in the sarne original facial itnagc. The proposed methods and some experimental rcsults are presented to demonstrate the effectivity atlcl the coming inherent subjects. Future problems arc to ilnprovc the regeneratior1 method of irises, to introd~lcc thc real time processing method, to cope with the tnolion of the head and finally to propose a new cyc-calncltr system which coulcl reduce tllc constrait~ts cauerrl by the head ~iiouted goggle.","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126242034","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":"Model Driven 3-D Shape Reconstruction by Matching Synthesized Images with Actual Images","authors":"H. Matsui, Y. Nomura, S. Fujii","doi":"10.7210/JRSJ.14.454","DOIUrl":"https://doi.org/10.7210/JRSJ.14.454","url":null,"abstract":"In this paper we propose a 3-D shape reconstruction method from multi-viewpoint images under the condition that the parameters such as poses of light sources and a moving camera are known. It is based on a principle of a model-synthesized image matching in which the shape of an object model is changed so that the model-synthesized images are matched with the multi-viewpoint input images. A 3-D target object is modeled as a triangular polygon. For matching, it is deformed by moving the vertices with a non-linear least squares method, and, if necessary, it is changed by dividing a triangle into some triangles and by merging some triangles to a triangle.","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125105865","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":"Multi Light Sources Range Finder System","authors":"T. Yoshimi, M. Oshima","doi":"10.7210/JRSJ.9.803","DOIUrl":"https://doi.org/10.7210/JRSJ.9.803","url":null,"abstract":"This paper describes a new range finder system which projects multi light planes. The purpose of the system is to get 3-D data of objects at high speed and with high accuracy. To realize the purpose two new techniques are introduced. One of the techniques is its optical system: each light source is composed of a laser diode and a cylindrical lens, and projects a light plane on the object. Fifteen light sources are located on a circle around a rotating mirror so that light planes are converged on the axis of rotation. A CCD camera takes the image of the light planes projected via the mirror. For each rotation angle, the light sources are turned on and off according to a specified code so that the light sources can be identified from the image data. Then, the mirror rotates to project light planes to other parts of the object. Another technique is the pre-processing circuit: it converts, in real time, video data from camera into reliable 2-D information of light planes appearing in the image. Due to the result that essential information is extracted with the circuit, size of output is drastically reduced. In this process, the 1/10 pixel accuracy of detected position data is achieved with a special interpolation scheme by a hard-wired computing circuit.","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132102363","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":"Tracking Soccer Player Using Multiple Views","authors":"Sachiko Iwase, H. Saito","doi":"10.11485/ITETAIKAI.2003S.0.87.0","DOIUrl":"https://doi.org/10.11485/ITETAIKAI.2003S.0.87.0","url":null,"abstract":"In this paper, we propose a method of tracking a soccer player using multiple cameras. For tracking soccer players, occlusion is always the big problem and tracking is often failed when only a single camera is used to take the scene. Therefore, we use multiple view images for avoiding the occlusion problem, so that we can obtain robustness in player tracking. In our method, inner-camera operation is performed independently in each camera for player tracking. If the player is not detected in the camera, inter-camera operation is performed and tracking information of all cameras are integrated by the geometrical relationship between cameras which is represented by fundamental matrices. Then the location of the player on each camera image is obtained in every frame. Experimental results show that robust player tracking is available by taking advantage of using multiple cameras.","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"1 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":"129033968","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":"Adaptive Background Estimation and Shadow Removal in Indoor Scenes","authors":"Junya Morita, Y. Iwai, M. Yachida","doi":"10.1016/B978-044451813-2/50038-5","DOIUrl":"https://doi.org/10.1016/B978-044451813-2/50038-5","url":null,"abstract":"","PeriodicalId":295384,"journal":{"name":"IAPR International Workshop on Machine Vision Applications","volume":"10 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":"121614389","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}