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RISS 인기검색어
- 검색키워드
- 저자 : Gaurav Tiwari (검색결과 3 건)
- 무료
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A Review on Robust Watermarking with its Applications and Comparative Analysis
Gaurav Tiwari 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.6
Due to improvement in imaging skill and the ease with which digital content can be imitated and operated there is a strong requirement for a digital patent device to be put in place. It requires for authentication of the content as well as the owner. Digital Watermarking is present as a potential key to this problem. Till date several watermarking techniques have been proposed. This paper proposed a comprehensive survey of the current schemes that have been developed and their effectiveness.
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A Review On High-Dynamic-Range Imaging With Its Technique
Gaurav Tiwari,Pushpi Rani 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.9
We presented a survey on High-dynamic-range imaging (HDRI or HDR) is a set of methods used in the imagingand photography to reproduce a superior dynamic range of luminosity than regular digital imaging or photographic methods can do. HDR images can denote a superior range of the luminance levels than can be attained using the extra 'classical' techniques. Images such as those holding many actual-world scenes, from same bright and direct sunlight to dangerous shade or very faint nebulae. It is the often succeeded in catching and then joining numerous dissimilar exposures of the similar subject matter. A Non-HDR cameras take a photograph with some limited amount of exposure range, as finally resulting in the damage of the detail in bright or dark parts. In this paper, we are studying about HDR image, generating of HDR image and also study about image fusion and methods of image fusioning.
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Mehta Gaurav,Shetty Utsav Chandrashekar,Meena Dharamraj,Tiwari Ashok Kumar,Nama Kishan Gopal,Aseri Dharmendra 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.3
Study Design: Prospective diagnostic imaging study. Purpose: The stability of the thoracic and lumbar spine depends significantly on the posterior ligamentum complex (PLC). Therefore, it is essential to diagnose PLC injuries accurately before deciding on a treatment plan for thoracolumbar injury patients. However, the efficacy of magnetic resonance imaging (MRI) in diagnosing PLC remains undetermined. Overview of Literature: MRI has become the ultimate tool in diagnosing spine injury cases, as previous literature suggests that it has very high sensitivity and specificity. But this is still controversial and as many surgeons rely on just MRI for selecting the patient for surgery, it becomes important to know the diagnostic accuracy of it. Methods: Patients who sustained injuries from T1 to L3 and required posterior surgery were prospectively studied. The treating surgeon and musculoskeletal radiologist participating in the study reviewed preoperative MRI images to characterize the level(s) of injury and the integrity of the six components of the PLC. These were classified as intact, incompletely disrupted, or disrupted. During the surgical procedure, the surgeon also classified each component of the PLC, and the radiologist’s and surgeon’s findings were compared. Results: Out of 66 patients, 46 were males (69.7%) and 20 were females (30.3%), and the average age was 34.12 years. According to the kappa score, there was a moderate level of agreement between the radiologist’s interpretation and the intraoperative findings for all PLC components except for the thoracolumbar fascia and ligamentum flavum for which there was a slight agreement. The sensitivity for the intact PLC components ranged from 100% (supraspinous ligament) to 66.67% (ligamentum flavum). The specificity ranged from 100% (interspinous ligament) to 52% (thoracolumbar fascia). The Spearman’s rank correlation ranged from 0.061 for the thoracolumbar fascia to 0.918 for the interspinous ligament, and the percentage agreement ranged from 81.82% (interspinous ligament to 36.36% (thoracolumbar fascia). Conclusions: The sensitivity and specificity of MRI for diagnosing injury of the PLC in this study were lower than those previously reported in the literature. The integrity of the PLC as determined by MRI should not be used in isolation to determine treatment.
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