The Experts below are selected from a list of 91173 Experts worldwide ranked by ideXlab platform
Tieniu Tan - One of the best experts on this subject based on the ideXlab platform.
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online text independent writer identification based on Temporal Sequence and shape codes
International Conference on Document Analysis and Recognition, 2009Co-Authors: Tieniu TanAbstract:In this paper we present a novel method for online text-independent writer identification. Most of the existing writer identification techniques require the data to be from a specific text which is not applicable to cases where such text is not available, such as in criminal justice systems when text documents with different content need to be compared. Text-independent approaches often require a large amount of data to be confident of good results. We propose Temporal Sequence and shape codes to encode online handwriting. Temporal Sequence codes (TSC) are to characterize trajectory in speed and pressure change in writing, and shape codes (SC) are to characterize direction of trajectory in writing handwriting. For TSC, we use two different codes to encode speed and pressure to codebook: stroke Temporal Sequence codes (STSC) and neighbor Temporal Sequence codes (NTSC). At identification stage, we implement decision and fusion strategy to identify writer. Experimental results show that our proposed method can improve the identification accuracy with a small number of characters. Moreover, we find that the proposed method is even effective for cross-language (English & Chinese) writer identification.
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ICDAR - Online Text-independent Writer Identification Based on Temporal Sequence and Shape Codes
2009 10th International Conference on Document Analysis and Recognition, 2009Co-Authors: Tieniu TanAbstract:In this paper we present a novel method for online text-independent writer identification. Most of the existing writer identification techniques require the data to be from a specific text which is not applicable to cases where such text is not available, such as in criminal justice systems when text documents with different content need to be compared. Text-independent approaches often require a large amount of data to be confident of good results. We propose Temporal Sequence and shape codes to encode online handwriting. Temporal Sequence codes (TSC) are to characterize trajectory in speed and pressure change in writing, and shape codes (SC) are to characterize direction of trajectory in writing handwriting. For TSC, we use two different codes to encode speed and pressure to codebook: stroke Temporal Sequence codes (STSC) and neighbor Temporal Sequence codes (NTSC). At identification stage, we implement decision and fusion strategy to identify writer. Experimental results show that our proposed method can improve the identification accuracy with a small number of characters. Moreover, we find that the proposed method is even effective for cross-language (English & Chinese) writer identification.
Scott P Bartlett - One of the best experts on this subject based on the ideXlab platform.
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Metopic synostosis: Defining the Temporal Sequence of normal suture fusion and differentiating it from synostosis on the basis of computed tomography images
Plastic and Reconstructive Surgery, 2003Co-Authors: Jeffrey Weinzweig, Alexander Farley, Jill Hunter, Richard E Kirschner, Philip Reiss, Linton A. Whitaker, Scott P BartlettAbstract:Only the metopic suture normally fuses during early childhood; all other cranial sutures normally fuse much later in life. Despite this, metopic synostosis is one of the least common forms of craniosynostosis. The Temporal Sequence of normal physiologic metopic suture fusion remains undefined and controversial. Therefore, diagnosis of metopic synostosis on the basis of computed tomography images alone can prove misleading. The present study sought to determine the normal Sequence of metopic suture fusion and characterize both endocranial and ectocranial suture morphology. An analysis of computed tomography scans of 76 trauma patients, ranging in age from 10 days to 18 months, provided normative craniofacial data that could be compared to similar data obtained from the preoperative computed tomography scans of 30 patients who had undergone surgical treatment for metopic synostosis. Metopic suture fusion was complete by 6 to 8 months in all nonsynostotic patients, with initiation of suture fusion evident as early as 3 months of age. Fusion was found to commence at the nasion, proceed superiorly in progressive fashion, and conclude at the anterior fontanelle. Although an endocranial ridge was not commonly seen in synostotic patients, an endocranial metopic notch was virtually diagnostic of premature suture fusion and was seen in 93 percent of synostotic patients. A metopic notch was not seen in any nonsynostotic patient. The morphologic and normative craniofacial data presented permit diagnosis of metopic synostosis based on computed tomography images obtained beyond the normal fusion period.
Jeffrey Weinzweig - One of the best experts on this subject based on the ideXlab platform.
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Metopic synostosis: Defining the Temporal Sequence of normal suture fusion and differentiating it from synostosis on the basis of computed tomography images
Plastic and Reconstructive Surgery, 2003Co-Authors: Jeffrey Weinzweig, Alexander Farley, Jill Hunter, Richard E Kirschner, Philip Reiss, Linton A. Whitaker, Scott P BartlettAbstract:Only the metopic suture normally fuses during early childhood; all other cranial sutures normally fuse much later in life. Despite this, metopic synostosis is one of the least common forms of craniosynostosis. The Temporal Sequence of normal physiologic metopic suture fusion remains undefined and controversial. Therefore, diagnosis of metopic synostosis on the basis of computed tomography images alone can prove misleading. The present study sought to determine the normal Sequence of metopic suture fusion and characterize both endocranial and ectocranial suture morphology. An analysis of computed tomography scans of 76 trauma patients, ranging in age from 10 days to 18 months, provided normative craniofacial data that could be compared to similar data obtained from the preoperative computed tomography scans of 30 patients who had undergone surgical treatment for metopic synostosis. Metopic suture fusion was complete by 6 to 8 months in all nonsynostotic patients, with initiation of suture fusion evident as early as 3 months of age. Fusion was found to commence at the nasion, proceed superiorly in progressive fashion, and conclude at the anterior fontanelle. Although an endocranial ridge was not commonly seen in synostotic patients, an endocranial metopic notch was virtually diagnostic of premature suture fusion and was seen in 93 percent of synostotic patients. A metopic notch was not seen in any nonsynostotic patient. The morphologic and normative craniofacial data presented permit diagnosis of metopic synostosis based on computed tomography images obtained beyond the normal fusion period.
Michael T Longaker - One of the best experts on this subject based on the ideXlab platform.
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studies in cranial suture biology iv Temporal Sequence of posterior frontal cranial suture fusion in the mouse
Plastic and Reconstructive Surgery, 1996Co-Authors: James P. Bradley, Douglas A Roth, Joseph G. Mccarthy, Jamie P. Levine, Michael T LongakerAbstract:Abstract The biology underlying normal and premature cranial suture fusion remains unknown. To develop a model for normal cranial suture fusion, the Temporal Sequence of the posterior frontal cranial suture fusion in the mouse was determined. To do this, all the cranial sutures of three distinct strains of mice (CD-1, CF-1, and C57bl-6) were studied histologically for fusion at sequential time points. Two studies were set up using group A mice (n = 72, all sutures studied) and group B mice (n = 78, only the posterior frontal suture studied, but more precisely along its anatomic length). In the group A cranial suture study, mice were sacrificed starting at newborn age and then every 5 days until age 50 days. In addition, two mature mice (250 days old) from each strain were sacrificed. In all three mouse strains, histologic examinations showed that the anterior frontal, sagittal, coronal, lambdoid, and occipitointerparietal sutures remained patent at up to 50 days of age and were patent in the 250-day mature mice. However, examination of the midpoint of the posterior frontal suture showed patency at 30 days, partial fusion at 35 days, and complete fusion by 40 days. These data prompted the posterior frontal suture fusion study. In the group B posterior frontal suture fusion study, mice were sacrificed at age 23 days and then every 2 days until 47 days of age. The anterior, midpoint, and posterior aspects of the posterior frontal suture were examined: The anterior aspect fused between 25 and 29 days; the midpoint fused between 31 and 37 days; and the posterior aspect fused between 39 and 45 days. These data indicate that fusion of the posterior frontal cranial suture in the mouse proceeds in a defined Temporal Sequence from an anterior to posterior direction in three distinct strains of mice, while in the same mice all other cranial sutures remain patent. By describing and understanding the fusion of the normal posterior frontal suture, a biologic basis of normal suture development and fusion can be established and used as a comparison for murine cranial sutures altered surgically, biochemically (with growth factors), or genetically (with craniosynostotic phenotypes).
Richard E Kirschner - One of the best experts on this subject based on the ideXlab platform.
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Metopic synostosis: Defining the Temporal Sequence of normal suture fusion and differentiating it from synostosis on the basis of computed tomography images
Plastic and Reconstructive Surgery, 2003Co-Authors: Jeffrey Weinzweig, Alexander Farley, Jill Hunter, Richard E Kirschner, Philip Reiss, Linton A. Whitaker, Scott P BartlettAbstract:Only the metopic suture normally fuses during early childhood; all other cranial sutures normally fuse much later in life. Despite this, metopic synostosis is one of the least common forms of craniosynostosis. The Temporal Sequence of normal physiologic metopic suture fusion remains undefined and controversial. Therefore, diagnosis of metopic synostosis on the basis of computed tomography images alone can prove misleading. The present study sought to determine the normal Sequence of metopic suture fusion and characterize both endocranial and ectocranial suture morphology. An analysis of computed tomography scans of 76 trauma patients, ranging in age from 10 days to 18 months, provided normative craniofacial data that could be compared to similar data obtained from the preoperative computed tomography scans of 30 patients who had undergone surgical treatment for metopic synostosis. Metopic suture fusion was complete by 6 to 8 months in all nonsynostotic patients, with initiation of suture fusion evident as early as 3 months of age. Fusion was found to commence at the nasion, proceed superiorly in progressive fashion, and conclude at the anterior fontanelle. Although an endocranial ridge was not commonly seen in synostotic patients, an endocranial metopic notch was virtually diagnostic of premature suture fusion and was seen in 93 percent of synostotic patients. A metopic notch was not seen in any nonsynostotic patient. The morphologic and normative craniofacial data presented permit diagnosis of metopic synostosis based on computed tomography images obtained beyond the normal fusion period.
