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arxiv: 2603.10128 · v2 · submitted 2026-03-10 · 💻 cs.CV

HG-Lane: High-Fidelity Generation of Lane Scenes under Adverse Weather and Lighting Conditions without Re-annotation

Pith reviewed 2026-05-15 12:57 UTC · model grok-4.3

classification 💻 cs.CV
keywords lane detectionadverse weatherimage synthesisautonomous drivingsynthetic datasetweather augmentationhigh-fidelity generationbenchmark
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The pith

HG-Lane generates photorealistic lane scenes in adverse weather and lighting without re-annotation, enabling better training of detection models.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper introduces HG-Lane, a framework designed to create high-fidelity synthetic images of road lanes under challenging conditions such as rain, snow, fog, night, and dusk. Current datasets lack sufficient examples of these scenarios, causing lane detectors to fail in safety-critical situations. HG-Lane avoids the costly step of re-annotating lanes in new images by preserving the original lane markings during generation. The authors build a 30,000-image benchmark from this method and demonstrate consistent gains when retraining existing detectors on the augmented data.

Core claim

HG-Lane is a high-fidelity generation framework that produces lane scenes under adverse weather and lighting conditions while preserving accurate lane geometry from source images, eliminating the need for re-annotation. When used to augment training data, this leads to substantial improvements in lane detection performance across multiple categories on a new benchmark containing 30,000 images.

What carries the argument

The HG-Lane high-fidelity generation framework that synthesizes adverse-condition images while keeping original lane annotations intact.

Load-bearing premise

The synthetic images must accurately mimic real adverse weather effects on lane visibility while exactly preserving the lane positions and shapes from the original annotations.

What would settle it

Measuring lane detection performance on a separate collection of real-world images captured in rain, snow, or fog; if accuracy does not improve over models trained only on standard datasets, the value of the generated data is refuted.

Figures

Figures reproduced from arXiv: 2603.10128 by Daichao Zhao, Feng He, Qiankun Li, Qiupu Chen, Xin Ning.

Figure 1
Figure 1. Figure 1: High-fidelity weather and lighting transformations generated by our HG-Lane framework. Lane labels are preserved exactly, while the remaining scene semantics are kept consistent across Normal, Night, Dusk, Snow, Rain, and Fog conditions. Abstract Lane detection is a crucial task in autonomous driving, helping to ensure the safe operation of vehicles. How￾ever, current datasets like CULane and TuSimple have… view at source ↗
Figure 2
Figure 2. Figure 2: Overview of the proposed HG-Lane. The input image is first processed into a fused control map combining color-based masks, Canny edges and lane annotations. In Stage-I, a Canny-ControlNet enforces lane geometry during reverse diffusion in latent space. In Stage-II, an InstructPix2Pix-ControlNet optionally refines appearance for “night” and “dusk”. Finally, the latent is decoded back to pixel space. All com… view at source ↗
Figure 3
Figure 3. Figure 3: Results of some baselines. The green lines in the figure represent the predicted values, while blue lines represent ground truth [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Ablation Study. Experiment #1, #2, #3, and #4 demonstrate the generation results of using Canny or InstructPix2Pix individually, as well as the effects of their combined order. control, or swapping the order of Canny and InstructP2P in our framework, may lead to suboptimal results. The images listed in [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Quality Analysis of Generation. Comparison of images generated by different frameworks. The figure illustrates the generation results of different frameworks across five categories (dusk, fog, rain, night, and snow) [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Comparison with Real-World Samples. B. Visualization in Suppression Module In [PITH_FULL_IMAGE:figures/full_fig_p011_6.png] view at source ↗
Figure 8
Figure 8. Figure 8: Examples of other datasets [PITH_FULL_IMAGE:figures/full_fig_p011_8.png] view at source ↗
read the original abstract

Lane detection is a crucial task in autonomous driving, as it helps ensure the safe operation of vehicles. However, existing datasets such as CULane and TuSimple contain relatively limited data under extreme weather conditions, including rain, snow, and fog. As a result, detection models trained on these datasets often become unreliable in such environments, which may lead to serious safety-critical failures on the road. To address this issue, we propose HG-Lane, a High-fidelity Generation framework for Lane Scenes under adverse weather and lighting conditions without requiring re-annotation. Based on this framework, we further construct a benchmark that includes adverse weather and lighting scenarios, containing 30,000 images. Experimental results demonstrate that our method consistently and significantly improves the performance of existing lane detection networks. For example, using the state-of-the-art CLRNet, the overall mF1 score on our benchmark increases by 20.87 percent. The F1@50 score for the overall, normal, snow, rain, fog, night, and dusk categories increases by 19.75 percent, 8.63 percent, 38.8 percent, 14.96 percent, 26.84 percent, 21.5 percent, and 12.04 percent, respectively. The code and dataset are available at: https://github.com/zdc233/HG-Lane.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The paper proposes HG-Lane, a high-fidelity generation framework for lane scenes under adverse weather and lighting conditions that preserves original annotations without re-labeling. It constructs a 30,000-image synthetic benchmark covering snow, rain, fog, night, and dusk scenarios, and reports that augmenting training data with these images yields consistent gains for lane detectors (e.g., +20.87% overall mF1 for CLRNet, with per-category F1@50 lifts ranging from 8.63% to 38.8%). Code and dataset are released.

Significance. If the generated images prove photorealistic and geometrically faithful, the approach offers a practical route to data augmentation for safety-critical lane detection without costly re-annotation, directly targeting the scarcity of adverse-condition data in CULane and TuSimple. Releasing the benchmark and code strengthens reproducibility and enables follow-on work.

major comments (2)
  1. [Experimental results / abstract] The headline performance claims (e.g., +20.87% mF1 for CLRNet) are measured exclusively on the authors' 30k-image synthetic benchmark generated by HG-Lane itself. No cross-domain experiments are reported that train on HG-Lane-augmented data and evaluate on held-out real adverse-weather splits from CULane or TuSimple, leaving the domain-gap assumption untested.
  2. [Abstract and §4] The abstract and results sections provide no quantitative validation of photorealism (e.g., FID scores against real adverse captures, perceptual studies, or geometry-preservation metrics such as lane-marking alignment error) beyond the downstream detector gains on synthetic data.
minor comments (1)
  1. [Method] Clarify in the method section how the weather/lighting control parameters are sampled to ensure diversity without introducing annotation drift.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments. We address each major point below, clarifying our evaluation choices while committing to revisions that strengthen the evidence for photorealism and cross-domain utility.

read point-by-point responses
  1. Referee: [Experimental results / abstract] The headline performance claims (e.g., +20.87% mF1 for CLRNet) are measured exclusively on the authors' 30k-image synthetic benchmark generated by HG-Lane itself. No cross-domain experiments are reported that train on HG-Lane-augmented data and evaluate on held-out real adverse-weather splits from CULane or TuSimple, leaving the domain-gap assumption untested.

    Authors: Our primary results focus on the HG-Lane benchmark because it provides a controlled, large-scale testbed for adverse conditions where real annotated data remains scarce; the consistent per-category gains (e.g., +38.8% F1@50 on snow) directly demonstrate the value of the generated data for the target task. We acknowledge that explicit cross-domain transfer results would further support generalization. In the revised manuscript we will add experiments that augment the original CULane training set with HG-Lane images and evaluate on the held-out real adverse-weather subsets of both CULane and TuSimple. revision: yes

  2. Referee: [Abstract and §4] The abstract and results sections provide no quantitative validation of photorealism (e.g., FID scores against real adverse captures, perceptual studies, or geometry-preservation metrics such as lane-marking alignment error) beyond the downstream detector gains on synthetic data.

    Authors: Downstream lane-detection gains serve as a task-specific proxy for image utility, especially given that lane annotations are exactly preserved. Nevertheless, we agree that direct metrics would increase confidence in photorealism and geometric fidelity. In the revision we will report FID scores between HG-Lane images and real adverse-weather captures from CULane, include a small-scale human perceptual study, and add a lane-marking alignment error metric computed on the preserved ground-truth labels. revision: yes

Circularity Check

0 steps flagged

No circularity; empirical gains measured on independently generated benchmark

full rationale

The paper presents an algorithmic generation framework (HG-Lane) that produces synthetic adverse-weather lane images while preserving original annotations, then reports standard mF1/F1 improvements when detectors are trained on mixes including these images and evaluated on the 30k-image benchmark. No equations, uniqueness theorems, or self-citations are invoked to derive the performance numbers; the gains are obtained by direct training and testing on held-out generated data using off-the-shelf metrics. This is a standard empirical pipeline with no reduction of claimed results to inputs by construction. The photorealism assumption for real-world transfer is an external validity concern, not a circularity in the derivation chain.

Axiom & Free-Parameter Ledger

1 free parameters · 0 axioms · 0 invented entities

The framework depends on generative models whose internal parameters control weather and lighting effects; these are tuned to produce the reported fidelity but are not enumerated in the abstract.

free parameters (1)
  • weather and lighting control parameters
    Parameters that govern intensity of rain, snow, fog, and illumination changes in the generation process; their specific values are chosen to achieve high fidelity but not listed in the abstract.

pith-pipeline@v0.9.0 · 5560 in / 1200 out tokens · 41457 ms · 2026-05-15T12:57:17.636980+00:00 · methodology

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    1 HG-Lane: High-Fidelity Generation of Lane Scenes under Adverse Weather and Lighting Conditions without Re-annotation Supplementary Material A. Visualization in Real-World In Figure 7, a comparison is presented between the samples generated by our framework and real-world samples. We can see that the realism of images generated by HG-Lane is very close t...