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Updated: Jun 21, 2026

Design, Surface Treatment, Cellular Plating, and Culturing of Modular Neuronal Networks Composed of Functionally Inter-connected Circuits
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FD-MSP: feature decoupling network with multi-scale prototypes for domain-adaptive polyp segmentation.

Wenqi Zhong1, Xu Yang2, Shengyuan Liu3

  • 1Faculty of Applied Sciences, Macao Polytechnic University, Macao SAR, China.

BMC Medical Imaging
|June 19, 2026
PubMed
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This study introduces FD-MSP, a new method for polyp segmentation in colonoscopy images. It improves deep learning models by decoupling features and using multi-scale prototypes, enhancing colorectal cancer detection across different devices.

Area of Science:

  • Medical Imaging
  • Artificial Intelligence
  • Computer Vision

Background:

  • Deep learning models excel at polyp segmentation for colorectal cancer detection but struggle with variations across different endoscopic devices and imaging protocols.
  • Unsupervised Domain Adaptation (UDA) aims to bridge this domain gap using labeled source data and unlabeled target data.
  • Existing UDA methods entangle domain-specific and invariant features and use single-scale representations, failing to capture polyp size variations.

Purpose of the Study:

  • To propose FD-MSP, a novel feature decoupling network with multi-scale prototypes for robust cross-domain polyp segmentation.
  • To address limitations of existing UDA methods by explicitly decoupling feature alignment and multi-scale prototype learning.
  • To improve the accuracy and generalizability of polyp segmentation models in colonoscopy images.
Keywords:
Decoupled networksDomain adaptationPolyp segmentationPrototype learning.

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Main Methods:

  • FD-MSP employs a dual-stream shallow-encoder to decouple domain-invariant polyp features from equipment-specific variations.
  • A multi-scale grouped prototype layer with dilated convolutions captures polyp patterns at various granularities.
  • An online pseudo-fusion adapter and a dual-branch gated head adaptively fuse predictions for improved segmentation.

Main Results:

  • FD-MSP demonstrated consistent performance improvements over existing UDA methods on three public colonoscopy datasets.
  • The proposed method effectively handles domain shifts caused by different imaging protocols and endoscopic devices.
  • Feature decoupling and multi-scale prototype learning proved crucial for enhanced cross-domain polyp segmentation.

Conclusions:

  • FD-MSP offers a significant advancement in unsupervised domain adaptation for colonoscopy polyp segmentation.
  • The proposed architecture effectively addresses the challenges of feature entanglement and scale variation in cross-domain segmentation.
  • This work contributes to more reliable early detection of colorectal cancer through improved automated polyp identification.