报告题目：Applications of Fractional-Order Derivatives: Underwater Image & Video Enhancement and Real World Image De-hazing/De-fogging Models

报告时间：2023年9月25日下午18:30–21:30

报告地点：乐学楼1105

报  告 人：Asmat ULLAH 教授

主办单位：新葡萄新京水力学与流体力学研究所

              江苏省力学学会环境与灾害力学专业委员会

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报告摘要：

o   To discuss, fractional-order derivatives based single image underwater image and video enhancement models and some AI-techniques.

•      De-hazing or De-fogging outdoor images in the presence of haze, fog or smog (which fades the colors and diminishes the contrast of the observed objects) has been a challenging task in image processing with several important applications.

•      In this presentation, a fuzzy membership function and fractional-order total variation based model is introduced that will be able to de-haze a given hazy or foggy image effectively.

•      The proposed method incorporates the atmospheric veil estimation based on a pixel-based operation using a fuzzy membership function.

•      Refine the transmission using fractional-order L1-norm–based regularization method.

•      To avoid color distortion of the sky region noted in recent methods, we employ a trapezoid-type fuzzy membership function.

•      The transmission map is then changed over to the high-quality depth map, with which the new fractional-order variational model can be framed to look for the haze free image for both grey and color outdoor images.

•      An explicit gradient descent scheme is employed to find efficiently the minimizer of the proposed energy functional for transmission.

•      Experimental tests on real world scenes show that the proposed method can de-haze or defog images effectively and efficiently.

报告人简介：

Dr. Asmat Ullah was born in Peshawar, Pakistan, in 1975. He received a BSc Degree in Physics and applied mathematics from University of Peshawar in 1997. He received an MSc and MS degrees in pure mathematics and computational mathematics from University of Peshawar and University of Engineering and Technology, Peshawar, KPK, Pakistan in 1999 and 2012 respectively. He obtained M.Ed., MBA degrees in 2002 and 2006-2008 from IMS and IER university of Peshawar, Pakistan.

In 2017, he received a PhD degree in Engineering Mechanics from Hohai University, Nanjing, China under the supervision of Professor Dr. Wen Chen (Late). He won the honor of excellent international student award of Hohai University, Nanjing china, during the academic year of 2016. He won the Honor of CSC Excellent International Student Award during the Academic Year of 2016-2017.

He served as an assistant/associate professor in Mathematics at Department of Basic Sciences University of Engineering & Technology Peshawar, Pakistan (2017-2023). Currently, he is also working as supervisor for MS and PhD level research students in University of Engineering and Technology, Peshawar, KPK, Pakistan. He is an author of more than 30 research papers.