LiteViLNet: Lightweight Vision-LiDAR Fusion Network for Efficient Road Segmentation
Pith reviewed 2026-05-21 05:53 UTC · model grok-4.3
The pith
LiteViLNet fuses vision and LiDAR in a lightweight network to reach 96.36% MaxF score with only 14.04M parameters for road segmentation.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
LiteViLNet is a lightweight multi-modal network that fuses RGB texture information and LiDAR geometric information for road segmentation. It uses a dual-stream lightweight encoder with depth-wise separable convolutions, a Multi-Scale Feature Fusion Module to enable cross-modal interaction at different levels, and a large-kernel-bridge module to capture long-range dependencies with linear complexity. This combination attains a 96.36% MaxF score with only 14.04M parameters, ranking best among CNN-based methods and comparable to larger transformer-based models on the KITTI Road dataset, while running at 163.79 FPS on RTX 4060 Ti and 22.18 FPS on Jetson Orin NX.
What carries the argument
The Multi-Scale Feature Fusion Module for cross-modal interaction at multiple scales together with the large-kernel-bridge module for efficient long-range dependency capture.
If this is right
- The model supports real-time road segmentation on resource-constrained embedded platforms such as the Jetson Orin NX for autonomous driving.
- CNN-based designs can compete with transformer-based models in accuracy for this task without high computational costs.
- The approach validates practical deployment of lightweight multi-modal networks in intelligent robotic systems and real-world applications.
Where Pith is reading between the lines
- Similar lightweight fusion modules could be tested on other multi-modal perception tasks such as object detection or semantic segmentation in varied environments.
- The linear complexity of the large-kernel module may allow the network to scale to higher-resolution inputs or video streams with limited additional cost.
- Evaluating the same architecture on datasets that include adverse weather or different sensor calibrations would clarify robustness beyond the KITTI Road benchmark.
Load-bearing premise
The accuracy-efficiency balance on the KITTI Road dataset results from the specific designs of the Multi-Scale Feature Fusion Module and large-kernel-bridge module rather than from training details or dataset properties.
What would settle it
An ablation experiment that removes the Multi-Scale Feature Fusion Module and large-kernel-bridge module and records a substantial drop in MaxF score below 96% while keeping training and data the same would show whether those modules drive the reported tradeoff.
Figures
read the original abstract
Road segmentation is a fundamental perception task for autonomous driving and intelligent robotic systems, requiring both high accuracy and real-time inference, especially for deployment on resource-constrained edge devices. Existing multi-modal road segmentation methods often rely on heavy transformer-based encoders to achieve state-of-the-art performance, but their enormous computational cost prohibits real-time deployment on embedded platforms. To address this dilemma, we propose \textbf{LiteViLNet}, a lightweight multi-modal network that fuses RGB texture information and LiDAR geometric information for efficient road segmentation. Specifically, we design a dual-stream lightweight encoder and depth-wise separable convolutions to extract hierarchical features from both modalities with minimal parameters. We further propose a Multi-Scale Feature Fusion Module (MSFM) to facilitate cross-modal interaction at different levels, and a large-kernel-bridge module to capture long-range dependencies with linear complexity. Extensive experiments on the KITTI Road dataset and real-world applications demonstrate that LiteViLNet achieves a promising balance between accuracy and efficiency. Notably, with only 14.04M parameters, our model attains a 96.36\% MaxF score, ranking the best among all CNN-based methods and being comparable to larger transformer-based models, and runs at 163.79 FPS in model-only inference on RTX 4060 Ti (22.18 FPS on Jetson Orin NX). It outperforms numerous heavy-weight methods in inference speed while maintaining highly competitive accuracy, fully validating the potential of LiteViLNet for real-time embedded deployment in autonomous driving and intelligent robotics.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript introduces LiteViLNet, a lightweight dual-stream CNN for RGB-LiDAR fusion in road segmentation. It employs depth-wise separable convolutions in the encoders, a Multi-Scale Feature Fusion Module (MSFM) for cross-modal interaction at multiple levels, and a large-kernel-bridge module for long-range dependencies with linear complexity. On the KITTI Road benchmark, the model with 14.04M parameters is reported to achieve 96.36% MaxF (best among CNN-based methods, comparable to larger transformers) while running at 163.79 FPS on RTX 4060 Ti and 22.18 FPS on Jetson Orin NX.
Significance. If the performance gains can be shown to stem from the proposed MSFM and large-kernel-bridge rather than training-protocol differences, the work would offer a practically significant advance for real-time multi-modal perception on edge devices, demonstrating that carefully designed lightweight CNNs can close much of the accuracy gap with heavier transformer models without prohibitive compute.
major comments (2)
- [Experiments] Experiments section: no ablation studies are presented that isolate the contribution of the MSFM or large-kernel-bridge module (e.g., by removing each and re-training under identical conditions). Without these, it is impossible to verify that the 96.36% MaxF and efficiency balance arise from the architectural innovations rather than optimizer, augmentation, or schedule choices.
- [§4] Comparison table (presumably Table 1 or equivalent in §4): MaxF and FPS numbers for prior CNN and transformer methods are taken directly from the original publications without re-implementation under a matched protocol (identical epochs, learning-rate schedule, input resolution, and test split). This leaves open the possibility that reported gaps are explained by experimental-setup differences rather than the dual-stream encoder + MSFM design.
minor comments (2)
- [Abstract] The abstract states results on 'real-world applications' but the main text should explicitly indicate whether these are only qualitative visualizations or include quantitative metrics on additional datasets.
- [Method] Notation for the large-kernel-bridge module should be clarified (e.g., explicit definition of kernel size, dilation, and how linear complexity is obtained) to aid reproducibility.
Simulated Author's Rebuttal
We thank the referee for their insightful comments, which have helped us improve the manuscript. We address the major comments point by point below and outline the revisions we will make.
read point-by-point responses
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Referee: [Experiments] Experiments section: no ablation studies are presented that isolate the contribution of the MSFM or large-kernel-bridge module (e.g., by removing each and re-training under identical conditions). Without these, it is impossible to verify that the 96.36% MaxF and efficiency balance arise from the architectural innovations rather than optimizer, augmentation, or schedule choices.
Authors: We fully agree with this observation. The current manuscript lacks explicit ablation studies to isolate the effects of the MSFM and large-kernel-bridge modules. To address this, we will conduct and include new ablation experiments in the revised version. Specifically, we will train variants without MSFM and without the large-kernel-bridge under the exact same training protocol, hyperparameters, and data augmentations as the full model. These results will be added to the Experiments section to demonstrate the contribution of each component. revision: yes
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Referee: [§4] Comparison table (presumably Table 1 or equivalent in §4): MaxF and FPS numbers for prior CNN and transformer methods are taken directly from the original publications without re-implementation under a matched protocol (identical epochs, learning-rate schedule, input resolution, and test split). This leaves open the possibility that reported gaps are explained by experimental-setup differences rather than the dual-stream encoder + MSFM design.
Authors: This is a valid point regarding the comparability of results. While we reported the numbers from the original papers as is common in the literature to avoid the prohibitive cost of re-implementing every method, we recognize that differences in training setups could influence the outcomes. In the revised manuscript, we will include a dedicated paragraph in the discussion or experiments section acknowledging these potential discrepancies and noting that all methods are evaluated on the same KITTI Road test set with standard metrics. Additionally, we will attempt to re-implement and re-train one or two representative methods under our protocol if resources permit, or at minimum provide more details on the training configurations used in the original works for better context. revision: partial
Circularity Check
No circularity: empirical claims rest on external KITTI evaluation
full rationale
The paper introduces a dual-stream lightweight encoder, Multi-Scale Feature Fusion Module (MSFM), and large-kernel-bridge module as explicit architectural proposals, then measures their effect via standard MaxF and FPS on the public KITTI Road dataset. These performance numbers (96.36% MaxF, 14.04M parameters, 163.79 FPS) are direct experimental outputs under fixed protocols, not quantities derived by construction from the modules themselves or from any fitted parameter that is later relabeled as a prediction. Cited baseline numbers from prior CNN and transformer papers are externally reproducible on the same public benchmark and therefore constitute independent evidence rather than a self-citation chain that collapses the central claim. No self-definitional equations, uniqueness theorems imported from the authors' prior work, or ansatz smuggling appear in the derivation; the accuracy-efficiency balance is therefore an empirical finding, not a tautology.
Axiom & Free-Parameter Ledger
free parameters (1)
- Channel counts, kernel sizes, and fusion scales in MSFM and encoders
axioms (2)
- domain assumption KITTI Road dataset is representative of real-world road segmentation conditions for autonomous driving.
- domain assumption Standard CNN optimization converges to a solution whose metrics reflect the architectural contributions rather than training artifacts.
invented entities (2)
-
Multi-Scale Feature Fusion Module (MSFM)
no independent evidence
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large-kernel-bridge module
no independent evidence
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