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Online Sub-Pixel Electron Spot Detection and Coalescence Deconvolution for High-Throughput Photoelectron Spectroscopy
编号：138 访问权限：仅限参会人 更新：2026-10-14 23:50:47 浏览：5次 口头报告

报告开始：暂无开始时间（Asia/Shanghai）

报告时间：暂无持续时间

所在会场：[暂无会议] [暂无会议段]

暂无文件

摘要
Two-dimensional MCP-CMOS detectors in ultraviolet photoelectron spectroscopy (UPS) increasingly operate under high incident fluxes, where spatial pulse pile-up severely bottlenecks single-event counting. At event densities exceeding 105 cps, adjacent electron luminescent spots coalesce—collapsing multiple events into merged blobs and distorting spectral channel linearity. Concurrently, hard region-of-interest (ROI) boundary cropping induces up to 1.35 px inward centroid drift. Conventional watershed segmentation mitigates clustering but over-segments noisy backgrounds and incurs prohibitive processing latency. Here, we present an online sub-pixel detection and deconvolution framework tailored for continuous stream acquisition. The pipeline establishes an intensity-preserving soft-gray field w(p) and extracts local extrema seeds, suppressing discrete threshold quantization. A joint gray-spatial distance operator (segmentByJointDistance) enforces partition boundaries along topographic energy saddle valleys through an adaptive damping factor (kvalley=0.5). Edge truncation is eradicated via a 13-pixel contextual expansion boundary ('WorkRect'). To sustain camera frame rates without specialized hardware, we prove the metric equivalence of sqrt-free distance assignment; combined with 2D spatial grid pruning, this eliminates over 90% of point evaluations. Real-time benchmarks on 1,001 experimental UPS frames (1920×1200 sensor format, 1200×1200 active pupil) yield sub-pixel localization accuracy (<0.035 px) and >120 FPS multi-core host throughput. Coalesced doublets are systematically recovered, extending linear counting response fourfold.
关键词
Photoelectron spectroscopy, Electron spot detection, Pulse pile-up separation, Sub-pixel centroiding, Real-time instrumentation, OpenMP acceleration.
报告人
Shibo Shang
None Xi'an Jiaotong University

稿件作者
Shibo Shang Xi'an Jiaotong University
Yalin Zhao Xi’an Jiaotong University
Xiaohan Hou Xi'an Jiaotong University
Haoye Zhang Northwest University
Sichao Zhang Xi’an Jiaotong University
Jingyi Liu Xi'an Jiaotong University
Ao Tan Xi'an Jiaotong University
ZhenXuan Li Xi’an Jiaotong University
Min Zhang Northwest University； China
双 王 西安交通大学
Xin Liu Xi’an Jiaotong University
Yu Chen Xi'an Jiaotong University
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重要日期

  • 会议日期

    11月06日

    2026

    至

    11月08日

    2026

  • 10月15日 2026

    初稿截稿日期

主办单位
IEEE Instrumentation and Measurement Society
承办单位
Sichuan University
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