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REVIEW 6 major objections 6 minor 56 references

Wavelet-GS: 3D Gaussian Splatting with Wavelet Decomposition

T0 review · 6 major / 6 minor · reviewed 2026-08-06 · deepseek-v4-flash

Pith's one-line read Paper claims that splitting a 3D point cloud into low- and high-frequency parts with wavelets, then training each part separately inside 3D Gaussian Splatting, yields more complete scene structures and sharper details in novel view…

desk verdict Promising idea, missing core: the 3D wavelet transform on point clouds is never defined, and the SOTA claims outrun the reported numbers. read the letter →

arxiv 2507.12498 v2 pith:5EJHKKCD submitted 2025-07-16 cs.GR

classification cs.GR
keywords 3DreconstructionGaussiansplattingwaveletdecompositionpoint-basedrenderingnovelviewsynthesisfrequencyseparationrelightingsparseviews
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper claims that separating a 3D point cloud into low- and high-frequency parts with a wavelet transform, then training each part with its own strategy inside 3D Gaussian Splatting, produces more complete scene structures and finer detail in novel view synthesis. The low-frequency branch is voxelized and grown/pruned to capture global outlines, while the high-frequency branch is trained to restore edges and textures and is paired with a relighting module that uses 2D wavelet decompositions of training images to model lighting. The paper reports that this combined framework beats prior 3DGS variants across four datasets (Waymo, Mip-NeRF360, Tanks&Temples, JHU-Drone) on PSNR, SSIM, and LPIPS, with the largest gains on sparse-view driving scenes. If correct, it would mean that explicit frequency separation inside a splatting pipeline is a practical route to sharper, more coherent scene reconstruction.

What carries the argument

The central object is the 3D wavelet decomposition of a point cloud, which splits the point set into Plow and Phigh using a scaling function phi and a wavelet function psi along the three spatial axes (Eqs. 9-10), exploiting the linearity of the wavelet transform to recombine them (Eq. 11). Each branch is voxelized and converted into Gaussian parameters by separate MLPs: the low-frequency branch uses a grow-and-prune voxel strategy inspired by Scaffold-GS, while the high-frequency branch uses a deviation thresholding mask to control voxel growth and a relight module (environment map times SH visibility) to compute per-Gaussian color. A 2D wavelet decomposition of the training images supplies structural features via an MLP, and the Laplacian-Wavelet loss LL-W penalizes differences across Laplacian pyramid levels and 2D DWT bands. These pieces together let the pipeline train low- and high-frequency content independently and recombine them at render time.

What would settle it

Run the 3D DWT exactly as specified by Eqs. 9-10 on a real COLMAP point cloud from one of the four datasets and check whether Plow and Phigh are finite point sets with well-defined coordinates that voxelize cleanly; if the transform requires a regular grid that the paper never defines, the decomposition is ill-posed and the method's core step does not exist as stated.

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Extended reading notes

Core claim

Wavelet-GS integrates a 3D discrete wavelet transform into 3D Gaussian Splatting, decomposing the input point cloud P into a low-frequency component Plow and a high-frequency component Phigh along the XYZ axes (Eqs. 8-10). Plow is voxelized into Vlow and rendered by neural Gaussians that are grown and pruned by gradient and opacity, capturing the global structural skeleton; Phigh is voxelized into Vhigh and rendered by a separate set of neural Gaussians whose colors are modulated by a relight module, restoring fine edges and textures. A 2D wavelet transform on the training images produces structural features that drive the relight module via spherical harmonics, and a Laplacian-Wavelet loss supervises multi-scale detail. The two branches are fused by the linearity of the wavelet transform (G = Gl + Gh), and the authors report that this decoupled, frequency-aware optimization surpasses prior state-of-the-art 3DGS variants on all four tested datasets.

Load-bearing premise

The load-bearing premise is that a discrete wavelet transform can be meaningfully applied to a sparse, irregular 3D point cloud along the XYZ axes so that the outputs Plow and Phigh are still point clouds that can be voxelized into Gaussians, but the paper does not specify the underlying grid, the decomposition level, or how wavelet coefficients map back to 3D positions.

Editorial extensions

If this is right

  • If the reported gains hold, frequency-separated optimization becomes a viable template for other point-based renderers, not just 3DGS.
  • The 2D-wavelet-driven relight module could transfer to any neural renderer that needs lighting robustness under sparse views.
  • The Laplacian-Wavelet loss could be reused as a general multi-scale detail loss in image- and radiance-field training.
  • On sparse-view datasets like Waymo, the method claims the largest improvements, suggesting frequency decomposition helps most when supervision is scarce.
  • The reported state-of-the-art numbers on four datasets imply that wavelet decomposition, not just extra capacity, is what drives the improvement.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The 3D DWT step as written is a voxel-grid convolution in disguise: the point cloud must first be sampled onto a regular grid for Eqs. 9-10 to apply, so the 'wavelet' part may be equivalent to a multiresolution voxel feature split rather than a true point-cloud transform.
  • The paper's ablation shows removing the 3D wavelet costs about 0.76 dB PSNR on Waymo while removing the 2D wavelet costs 0.43 dB and removing the individual strategy costs 1.12 dB; the largest single contributor may be the training strategy, not the wavelet decomposition itself.
  • A cheap test of the wavelet family's importance would be to replace coif1 with a simple high-pass/low-pass filter pair on the voxel grid; if the gains persist, the specific wavelet basis is not the active ingredient.
  • The method's dependence on voxelization suggests it could combine naturally with octree or hierarchical Gaussian structures to scale to unbounded scenes.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

6 major / 6 minor

Summary. The paper proposes Wavelet-GS, a 3D Gaussian Splatting framework that applies 3D wavelet decomposition to the input point cloud, splitting it into low- and high-frequency branches that are trained with separate strategies, and additionally applies a 2D wavelet transform to training images to guide a relight module. The low-frequency branch is voxelized and trained with a grow-and-prune strategy, while the high-frequency branch is trained with a Laplacian-Wavelet loss and a LumiGauss-style relight module. Experiments on Waymo, JHU-Drone, Tanks&Temples, and Mip-NeRF360 report strong quantitative results, and ablations on the Waymo dataset are used to justify each component.

Significance. If the method were fully specified and reproducible, a principled frequency-separated Gaussian training scheme would be a useful contribution to the 3DGS literature, and the inclusion of four datasets plus ablations over wavelet families is a positive feature. However, the central construction—the 3D wavelet decomposition of an unorganized point cloud—is never concretely defined, the claimed fusion of the two branches is not connected to the rendering equation, and the paper's own Table 1 contradicts the headline claim of surpassing all methods on all four datasets. As submitted, the significance of the empirical results cannot be evaluated because the method is not implementable from the text.

major comments (6)
  1. [Section 3.3, Eqs. (8)-(11)] The 3D DWT is applied to 'the 3D point cloud P', but P is a set of unorganized points; Eqs. (9)-(10) treat P(m,n,p) as values on a regular grid indexed by (m,n,p) and evaluate scaling/wavelet functions at grid indices, without specifying the grid resolution, extents, decomposition level, boundary handling, or the mapping from wavelet coefficients back to 3D point coordinates. A standard single-level 3D DWT of a voxel grid yields eight subbands (LLL, LLH, LHL, LHH, HLL, HLH, HHL, HHH), not two point clouds, and Eq. (11) is not the inverse-DWT reconstruction formula: synthesis filters and upsampling are required. As written, the central operation is unimplementable, so the low/high branch separation and all subsequent results cannot be attributed to the described mechanism.
  2. [Section 3.5, Eq. (16)] The fusion rule G(x)=Gl(x)+Gh(x) is asserted to follow from wavelet linearity, but the paper never defines the addition of two sets of anisotropic Gaussians or how the two branches are combined in the rendering pass; the rendering equation (7) is the standard alpha-blending formula with a single set of Gaussians. The manuscript needs an explicit forward pass showing how Plow and Phigh become Gaussian parameters and how their rendered images are fused.
  3. [Section 4.1 and Section 3.5] Key implementation details are missing: no voxelization threshold or resolution for Vlow/Vhigh beyond the global voxel size 0.001, no coordinate normalization for unbounded scenes, no definition of the high-frequency deviation mask thresholds, no grow/prune schedules, no optimizer settings, and no code or supplementary implementation. Without these, the experiments are not reproducible and the 'individual optimization strategy' cannot be evaluated.
  4. [Table 1, Tanks&Temples row] The abstract and introduction claim that the framework 'surpasses existing state-of-the-art results on all four 3D datasets', but on Tanks&Temples the reported PSNR (24.40) is lower than Octree-GS (24.54); the same table also shows equal SSIM (0.863) with Octree-GS on that dataset. The claim needs to be restated per metric or the results corrected, and the conclusion that the method surpasses all methods on all four datasets is not supported by the presented numbers.
  5. [Section 3.4, Eq. (15)] The definition LSH = E[min(0, Li(M))^2] is confusing: min(0, ·) is non-positive, and squaring it gives a positive quantity but this is not the standard squared-SH loss convention (which uses the positive part of the irradiance). Please clarify the sign convention and justify the choice; as written, the loss can encourage negative radiance values and its optimization target is unclear.
  6. [Section 3.5.2, Eqs. (23)-(24)] The relight color formulas have dimension mismatches: in Eq. (23), n_k is a normal vector but is used as n_k^T M_env n_k where M_env is not defined as a matrix; in Eq. (24), rho_k in R^3 is multiplied by an SH sum whose coefficient indexing is inconsistent with Eq. (14). Please provide a precise tensor specification for the relight module.
minor comments (6)
  1. [Figure 2 caption] The caption contains typos: 'gradint' should be 'gradient', 'compoment' should be 'component', and 'in the same time' should be 'at the same time'.
  2. [Section 3.4] The sentence 'we follow [13] and use LSH-env:' is incomplete; Eq. (15) follows, but the relation of LSH to the SH environment loss and to the preceding SH expansion should be stated explicitly.
  3. [Section 4.3, Table 3] Table 3 is described as comparing wavelet families on 'real-world datasets', but it reports results only on Waymo; the caption and text should specify the dataset.
  4. [Abstract and Section 3.4] The phrase 'simulating radiance variations' is vague; the 2D wavelet decomposition is applied to training images, but the connection between the wavelet coefficients, the structural feature M in Eq. (13), and the final radiance is not made precise.
  5. [Throughout] The paper repeatedly uses 'function' where 'module' or 'component' is meant (e.g., '3D wavelet decomposition function', 'loss function LL-W'); please standardize terminology.
  6. [Eq. (22)] The symbol L is used both for the number of Laplacian pyramid levels and for the pyramid representation L1^(l); please disambiguate the notation.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the pipeline is a supervised reconstruction and the wavelet steps are preprocessing, not fitted predictions.

full rationale

The paper is a supervised reconstruction method: 3DGS Gaussians are optimized against photometric losses (Eqs. 7, 19, 25) on external benchmarks (Mip-NeRF360, Waymo, Tanks&Temples, JHU-Drone). The claimed 'prediction' is novel-view rendering from trained Gaussians, which is not equivalent to any fitted input by construction. The 3D wavelet decomposition (Eqs. 8-11) is introduced as a preprocessing or initialization step; whether it is mathematically well-defined for a sparse point cloud is a reproducibility and correctness concern, not a circularity, because the text never claims that state-of-the-art performance is logically entailed by the wavelet identities. The relight module is explicitly ported from LumiGauss [13], an external citation, and the two same-group citations ([19] dataset, [35] GVKF) are used for evaluation and a background limitation remark, not to justify the core derivation. Equation 16 (G = G_l + G_h) is a fusion formulation; even if it is not actually used in the rendering equation, that is a gap in the write-up, not a fit disguised as a prediction. No step reduces the output to its inputs by definition, so no circularity is found.

Assumptions & free parameters 6 free parameters · 4 assumptions · 0 invented entities

The method's central operation is under-specified; the paper hides the implementation of the point-cloud DWT behind equations that apply only to regular grids, and reports no sensitivity analysis for the many fixed hyperparameters (voxel size, loss weights, growth/pruning thresholds). These choices, not derived from theory, are effectively free parameters.

free parameters (6)
  • voxel_size = 0.001
    Set for all scenes without units or sensitivity analysis; controls the granularity of voxelization that generates Gaussians (Section 4.1).
  • neighbor_count_k = 10
    Number of neighbor nodes used in the voxel graph (Section 4.1); fixed across all datasets.
  • loss_weights = lambda_SSIM=0.2, lambda_vol=0.01, lambda_SH=0.05, lambda_L-W unspecified
    Ad hoc weights for Lpixel, LSH and LL-W; lambda_L-W in Eq. 25 is not given a value.
  • wavelet_family = coif1
    Selected by ablation on the Waymo dataset (Table 3), then used for all reported results; selection on the evaluation set is a form of tuning.
  • grow_prune_thresholds = not specified
    Voxel growth uses average gradient plus a random picking strategy; pruning uses an opacity threshold described only as 'sufficient opacity' (Section 3.5.1).
  • high_frequency_mask_thresholds = not specified
    Masking of 'excessively large or small' high-frequency deviations is not quantified (Section 3.5.2).
assumptions (4)
  • standard math Wavelet transform linearity: T{f1+f2} = T{f1} + T{f2}
    Invoked in Eq. 3 to justify fusing low- and high-frequency Gaussians in Eq. 16; mathematically true for grid signals but does not extend to Gaussian parameter spaces.
  • domain assumption Point cloud can be decomposed by 3D DWT along XYZ
    Section 3.3, Eqs. 8-11 assume P(m,n,p) exists on a regular grid, which is not true for sparse point clouds; no construction is provided.
  • domain assumption SH-based radiance transfer and LumiGauss two-stage relight training apply to the high-frequency component
    Section 3.4 and 3.5.2 port the env-map SH model and loss from LumiGauss [13] without re-derivation for the wavelet-separated branch.
  • ad hoc to paper G(x) = G_l(x) + G_h(x) via wavelet linearity
    Eq. 16 asserts additive fusion of Gaussian parameters based on wavelet linearity, which does not follow for the parameters (position, scale, opacity, color) of Gaussians.

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Cite this review

Pith. "Pith review of Wavelet-GS: 3D Gaussian Splatting with Wavelet Decomposition." pith.science (2026). https://pith.science/paper/5EJHKKCD

@misc{pith2026250712498,
  author       = {Pith},
  title        = {Pith review of: Wavelet-GS: 3D Gaussian Splatting with Wavelet Decomposition},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/5EJHKKCD}},
  note         = {Machine review of arXiv:2507.12498}
}
read the original abstract

3D Gaussian Splatting (3DGS) has revolutionized 3D scene reconstruction, which effectively balances rendering quality, efficiency, and speed. However, existing 3DGS approaches usually generate plausible outputs and face significant challenges in complex scene reconstruction, manifesting as incomplete holistic structural outlines and unclear local lighting effects. To address these issues simultaneously, we propose a novel decoupled optimization framework, which integrates wavelet decomposition into 3D Gaussian Splatting and 2D sampling. Technically, through 3D wavelet decomposition, our approach divides point clouds into high-frequency and low-frequency components, enabling targeted optimization for each. The low-frequency component captures global structural outlines and manages the distribution of Gaussians through voxelization. In contrast, the high-frequency component restores intricate geometric and textural details while incorporating a relight module to mitigate lighting artifacts and enhance photorealistic rendering. Additionally, a 2D wavelet decomposition is applied to the training images, simulating radiance variations. This provides critical guidance for high-frequency detail reconstruction, ensuring seamless integration of details with the global structure. Extensive experiments on challenging datasets demonstrate our method achieves state-of-the-art performance across various metrics, surpassing existing approaches and advancing the field of 3D scene reconstruction.

Figures

Figures reproduced from arXiv: 2507.12498 by the authors.

Figure 1
Figure 1. Overview of our model. Through 3D wavelet decomposition, the 3D point cloud is divided into low frequency and high [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Framework of Wavelet-GS. We begin by preprocessing the point cloud by voxelization and 3D wavelet decomposition. [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. 3D wavelet decomposition. The input data for the [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: Simulation for the structural feature We use 2D [PITH_FULL_IMAGE:figures/full_fig_p005_4.png]
Figure 5
Figure 5. Figure 5: Comparison Results. Visual differences are highlighted with red insets for better clarity. Our approach consistently [PITH_FULL_IMAGE:figures/full_fig_p007_5.png]

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Pith tools

Reviewed August 6, 2026 · model on record in the stance chip above.