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Modified Laser Speckle Imaging with Adaptive Window
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作者 Ho-young JIN Hyun-chool SHIN +2 位作者 Kab-mun CHA Ki-won RHEE Nitish Thakor 《Journal of Measurement Science and Instrumentation》 CAS 2010年第3期238-241,共4页
One of the advantages of laser speckle is detecting microvascular through image processing. This paper proposes a new image processing method for laser speckle, adaptive window method that adaptively processes laser s... One of the advantages of laser speckle is detecting microvascular through image processing. This paper proposes a new image processing method for laser speckle, adaptive window method that adaptively processes laser speckle images in the space. Disadvantage of conventional fixed window method is that it uses the same window size regardless of target areas. Inherently laser speckle contains undesired noise. Thus a large window is helpful for removing the noise, but it results in low resolution of image. Otherwise a small window may detect micro vascular but it has limits in noise removal. To overcome this trade-off, the concept of adaptive window method is newly introduced to conventional laser speckle image analysis. In addition, the modified adaptive window method applied to other selection images. We have compared conventional Laser Speckle Contrast Analysis (LASCA) and its variants with the proposed method in terms of image quality and processing complexity, Moreover compared the result of the accompamed changing sdection images have also been compared. 展开更多
关键词 Laser speckle contrast analysis (LASC) adaptive window laser speckle selection image
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DETECTING CEREBRAL ARTERIES AND VEINS:FROM LARGE TO SMALL
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作者 PENG MIAO MINHENG LI +4 位作者 NAN LI ABHISHEK REGE YISHENG ZHU NITISH THAKOR SHANBAO TONG 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS 2010年第1期61-67,共7页
In this paper,a model-based reconstruction technique is proposed to simultaneously measure the relative deoxyhemoglobin concentration and the relative blood flow velocity in cerebral cortex.With the help of this model... In this paper,a model-based reconstruction technique is proposed to simultaneously measure the relative deoxyhemoglobin concentration and the relative blood flow velocity in cerebral cortex.With the help of this model-based reconstruction technique,artifacts due to nonuniform laser illumination and curvature of cortex are efficiently corrected.The results of relative deoxyhemoglobin concentration and relative blood flow velocity are then used to detect and distinguish cerebral arteries and veins.In an experimental study on rat,cerebral blood vessels are segmented from the reconstructed blood flow image by Otsu multiple threshold method.Afterwards,arteries and veins are distinguished by a simple fuzzy criterion based on the information of relative deoxyhemoglobin concentration. 展开更多
关键词 Intraoperative detection optical intrinsic signal(OIS) laser speckle imaging(LSI) laser speckle contrast analysis(LASCA) model based reconstruction
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