Longyin Xu

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Optical polarization provides important clues to the magnetic field in blazar jets. It is easy to find noteworthy patterns in the time-series data of the polarization degree (PD) and position angle (PA). On the other hand, we need to see the trajectory of the object in the Stokes QU plane when the object has multiple polarized components. In this case,(More)
  • L Xu, X Zheng
  • 1997
A method of contrast enhancement for retinal vascular images is provided. Opening of a gray-scale image by a gray-scale structuring element(SE) can generate a background image. Enhancement is achieved by subtracting this background image from the original image and then applying a adaptive gray-scale modification technique which is based on the local(More)
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