Coupled s-excess HMM for vessel border tracking and segmentation

Area of Science:

• Medical Imaging
• Computational Biology
• Image Analysis

Background:

• Accurate segmentation of lymphatic vessel walls in fluorescent confocal images is crucial for biological and medical research.
• Existing image segmentation methods often struggle with complex structures and computational demands.

Purpose of the Study:

• To develop a novel, efficient, and accurate image segmentation technique for simultaneously identifying interior and exterior walls of lymphatic vessels.
• To improve the analysis of fluorescent confocal microscopy images of lymphatic vessels.

Main Methods:

• A novel image segmentation technique based on hidden Markov models (HMMs) is proposed.
• Radial basis functions (RBFs) are used to parameterize vessel borders, reducing computational complexity.
• Patch-wise convolutional neural networks (CNNs) detect border information, with softmax for emission probabilities and s-excess optimization for transition probabilities.

Main Results:

• The proposed method transforms segmentation into minimizing an s-excess graph cut, representing hidden states as graph nodes.
• Qualitative and quantitative analyses demonstrate superior performance compared to Viterbi and Baum-Welch algorithms.
• The method effectively segments both inner and outer walls of lymphatic vessels in image sequences.

Conclusions:

• The novel HMM-based image segmentation technique offers superior performance and efficiency for analyzing lymphatic vessel structures.
• This method provides a robust tool for researchers working with fluorescent confocal images of lymphatic vessels.
• The integration of RBFs, CNNs, and s-excess optimization presents a significant advancement in image segmentation for biological applications.