Micro-splatting: Maximizing Isotropic Constraints for Refined Optimization in 3D Gaussian Splatting

Abstract: Recent advancements in 3D Gaussian Splatting have achieved impressive scalability and real-time rendering for large-scale scenes but often fall short in capturing fine-grained details. Conventional approaches that rely on relatively large covariance parameters tend to produce blurred representations, while directly reducing covariance sizes leads to sparsity. In this work, we introduce Micro-splatting (Maximizing Isotropic Constraints for Refined Optimization in 3D Gaussian Splatting), a novel framework designed to overcome these limitations. Our approach leverages a covariance regularization term to penalize excessively large Gaussians to ensure each splat remains compact and isotropic. This work implements an adaptive densification strategy that dynamically refines regions with high image gradients by lowering the splitting threshold, followed by loss function enhancement. This strategy results in a denser and more detailed gaussian means where needed, without sacrificing rendering efficiency. Quantitative evaluations using metrics such as L1, L2, PSNR, SSIM, and LPIPS, alongside qualitative comparisons demonstrate that our method significantly enhances fine-details in 3D reconstructions.