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Sifeng He

6 accepted papers

2025

Guiding Cross-Modal Representations with MLLM Priors via Preference Alignment

NeurIPS 2025poster

Despite Contrastive Language–Image Pre-training (CLIP)'s remarkable capability to retrieve content across modalities, a substantial modality gap persists in its feature space. Intriguingly, we discover that off-the-shelf MLLMs (Multimodal Large Language Models) demonstrate powerful inherent modality…

Cited by 0SourceScholar
2024

Let All Be Whitened: Multi-Teacher Distillation for Efficient Visual Retrieval

AAAI 2024technical

Visual retrieval aims to search for the most relevant visual items, e.g., images and videos, from a candidate gallery with a given query item. Accuracy and efficiency are two competing objectives in retrieval tasks. Instead of crafting a new method pursuing further improvement on accuracy, in this p…

2023

Boundary-Aware Backward-Compatible Representation via Adversarial Learning in Image Retrieval

CVPR 2023poster

Image retrieval plays an important role in the Internet world. Usually, the core parts of mainstream visual retrieval systems include an online service of the embedding model and a large-scale vector database. For traditional model upgrades, the old model will not be replaced by the new one until th…

2023

TransVCL: Attention-Enhanced Video Copy Localization Network with Flexible Supervision

AAAI 2023technical

Video copy localization aims to precisely localize all the copied segments within a pair of untrimmed videos in video retrieval applications. Previous methods typically start from frame-to-frame similarity matrix generated by cosine similarity between frame-level features of the input video pair, an…

2022

A Large-Scale Comprehensive Dataset and Copy-Overlap Aware Evaluation Protocol for Segment-Level Video Copy Detection

CVPR 2022poster

In this paper, we introduce VCSL (Video Copy Segment Localization), a new comprehensive segment-level annotated video copy dataset. Compared with existing copy detection datasets restricted by either video-level annotation or small-scale, VCSL not only has two orders of magnitude more segment-level…

Cited by 18PDFcodeScholar
2017

A regularized on-line sequential extreme learning machine with forgetting property for fast dynamic hysteresis modeling

IROS 2017poster

Piezoelectric ceramics(PZT)actuator has been widely used in flexure-guided nanopositioning stage because of their high resolution. However, it is quite hard to achieve high-rate precision positioning control because of the complex hysteresis nonlinearity effect of PZT actuator. Thus, an online RELM…

Cited by 2SourceScholar