Marker and Motion Guided Deep Networks for Cell Segmentation and Detection Using Weakly Supervised Microscopy Data.

The accurate detection and segmentation of cells in microscopy image sequences play a crucial role in biomedical research and clinical diagnostic applications. However, accurately segmenting cells in low signal-to-noise ratio images remains challenging due to dense touching cells and deforming cells with indistinct boundaries. To address these challenges, this paper investigates the effectiveness of marker-guided networks, including UNet, with Squeeze-and-Excitation (SE) or MixTransformer (MiT) backbone architectures. We explore their performance both independently and in conjunction with motion cues, aiming to enhance cell segmentation and detection in both real and simulated data. The squeeze and excitation blocks enable the network to recalibrate features, highlighting valuable ones while downplaying less relevant ones. In contrast, the transformer encoder doesn’t require positional encoding, eliminating the need for interpolating positional codes, which can result in reduced performance when the testing resolution differs from the training data. We propose novel deep architectures, namely Motion USENet (MUSENet) and Motion UMiTNet (MUMiTNet), and adopt our previous method Motion UNet (MUNet), for robust cell segmentation and detection. Motion and change cues are computed through our tensor-based motion estimation and multi-modal background subtraction (BGS) modules. The proposed network was trained, tested, and evaluated on the Cell Tracking Challenge (CTC) dataset. When comparing UMiTNet to USENet, there is a noteworthy 23% enhancement in cell detection accuracy when trained on real data and tested on simulated data. Additionally, there is a substantial 32% improvement when trained on simulated data and tested on real data. Introducing motion cues (MUMiTNet) resulted in a significant 25% accuracy improvement over UMiTNet when trained on real data and tested on simulated data, and a 9% improvement when trained on simulated data and tested on real data. In the generalization experiment, when trained on CTC and tested on unseen Crushed Muscle Extract (CME) and Minimal Media (MM) data, USENet outperformed all other methods for CME data, achieving an accuracy of 57.8%. On the other hand, MUMiTNet outperformed all other methods for MM data, achieving an accuracy of 61.3%, where the inclusion of motion cues resulted in an enhancement of approximately 7%. The source code of the MUSENet and MUMiTNet are available at https://github.com/CIVA-Lab/Motion-SE-MiT-Net.