報告題目:Randomized block Krylov subspace algorithms for low rank quaternion matrix approximations
主講人:李朝遷教授(云南大學)
時間:2023年11月10日(周五)10:00 a.m.
地點:北院卓遠樓305會議室
主辦單位:統(tǒng)計與數(shù)學學院
摘要:A randomized quaternion singular value decomposition algorithm based on Block Krylov Iteration (RQSVD-BKI) is presented to solve the low-rank quaternion matrix approximation problem. The upper bounds of deterministic approximation error and expected approximation error for the RQSVD-BKI algorithm are also given. It is shown by numerical experiments that the running time of the RQSVD-BKI algorithm is smaller than that of the quaternion singular value decomposition, and the relative errors of the RQSVD-BKI algorithm are smaller than those of the randomized quaternion singular value decomposition algorithm in some cases. In order to further illustrate the feasibility and effectiveness of the RQSVD-BKI algorithm, we use it to deal with the problem of color image inpainting.
主講人簡介:
李朝遷,男,計算數(shù)學博士,云南大學數(shù)學與統(tǒng)計學院教授,博士研究生導師,中國高等教育學會教育數(shù)學專業(yè)委員會監(jiān)事,中國數(shù)學會計算數(shù)學分會第十一屆理事會理事,中國運籌學會數(shù)學規(guī)劃分會第八屆理事會理事。
李朝遷教授主要研究結構矩陣(張量)、張量特征值理論、張量分解及其在圖像處理中的應用等問題。截至目前,發(fā)表SCI檢索論文80余篇, 主持國家自然科學基金3項;2016年獲中國科學院“西部之光”人才培養(yǎng)引進計劃的資助、2018年入選云南省萬人計劃青年拔尖人才計劃項目;2021年獲云南省自然科學獎二等獎1項(排名第一)。