Source localization realizes single frame super-resolution for fluorescence imaging

TL;DR

Source Localization (SoLo) is a novel single-frame super-resolution algorithm for fluorescence imaging that enables real-time, high-resolution live-cell imaging without the typical limitations of existing methods.

Contribution

We introduce SoLo, a non-iterative, parallelizable super-resolution method that preserves intensity linearity and extends to 3D and nonlinear imaging, suitable for real-time biomedical applications.

Findings

SoLo achieves real-time super-resolution imaging.

It preserves intensity linearity for quantitative analysis.

Extensions include 3D-SoLo and NL-SoLo for volumetric and high-density imaging.

Abstract

Existing super-resolution microscopy is often constrained by inherent trade-offs between resolution, acquisition speed, phototoxicity, and hardware complexity. Computational post-processing approaches offer a promising alternative, but they typically suffer from linearity distortion, high computational cost, reliance on pre-training data, or reconstruction artifacts. Here, we present Source Localization (SoLo), a novel single-frame super-resolution algorithm for fluorescence imaging without these limitations. Built on the principle of inferring fluorescent source positions via sampling-detection strategy, SoLo achieves non-iterative, parallelizable computation, enabling real-time live-cell imaging with high spatiotemporal resolution. The intensity linearity preservation of SoLo makes it compatible with quantitative analysis such as calcium imaging and fluorescence resonance energy transfer. We further extended this framework to 3D-SoLo for volumetric imaging and nonlinear SoLo (NL-SoLo) for high-density fluorescence fluctuation imaging. With its ease of parameter tuning and compatibility with existing imaging systems, SoLo offers an accessible solution for ordinary labs, enabling diverse biomedical imaging applications.