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REVIEW 3 major objections 4 minor 70 references

Accuracy does not buy human-likeness in monocular depth estimation

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

T0 review · deepseek-v4-flash

2026-08-04 06:39 UTC pith:LNZBD65R

load-bearing objection The KITTI human-depth dataset is a real contribution and the inverse-U is worth arguing about, but the right-hand slope is not yet cleanly separated from a correlation artifact. the 3 major comments →

arxiv 2512.08163 v2 pith:LNZBD65R submitted 2025-12-09 cs.CV

Accuracy Does Not Guarantee Human-Likeness: Cross-Domain Human-Centered Benchmark in Monocular Depth Estimation

classification cs.CV
keywords monocular depth estimationhuman-AI alignmenthuman-like perceptionaccuracy-likeness trade-offKITTI benchmarkpartial correlationaffine decompositiondepth perception
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

A new human-centered benchmark asks people to judge absolute distances at fixed points in real street scenes and compares their error patterns with those of 69 deep-learning depth estimators. The paper's central claim is that metric accuracy and human-like behavior are not the same axis: as models become more accurate than humans, their error patterns diverge from human judgments, producing an inverse-U relationship in which models near human-level accuracy look most human. The same trade-off appears in the systematic components of error (scale, shift, shear, and residual) after an affine decomposition. The authors argue that physical accuracy and human-likeness are complementary, domain-sensitive dimensions of depth-estimation performance, so accuracy benchmarks alone cannot tell whether a model estimates depth the way people do.

Core claim

On KITTI, across 69 monocular depth estimators spanning architectures, training strategies, and datasets, the authors measured human-model similarity as the partial correlation between human and model depth estimates after removing the variance explained by physical depth, using scale-and-shift-aligned predictions. They found that most models show positive but substantially lower similarity to humans, and that human similarity does not rise monotonically with accuracy. In scale-recovered data the relationship is an inverse-U: among models less accurate than humans, improving accuracy is associated with higher human similarity (r=-0.56 between log-RMSE and similarity), while among models more

What carries the argument

The central measuring device is a partial correlation between human and DNN depth estimates after regressing out physical ground-truth depth, computed per image on 16 evaluation points with random half-splits of human observers; this isolates shared error patterns from accuracy. To dissect where the shared error lives, the paper applies an affine decomposition that fits each estimator's depth values to physical depth plus three geometric degrees of freedom — scale, shift, and horizontal and vertical shear — leaving a residual component. The inverse-U trade-off is then quantified by correlating log scale-shift-invariant RMSE with human similarity separately for models above and below human ac

Load-bearing premise

The trade-off rests on treating the correlation between the leftover errors of humans and models as a fair measure of human-likeness even though the most accurate models have very little leftover error left, which shrinks that correlation toward its noise floor.

What would settle it

Regress the residuals of the most accurate KITTI model onto human residuals, add a scaled copy of the human residual pattern back to the model's predictions so that its residual variance matches human residual variance, and recompute the partial correlation. If human similarity rises steeply in these variance-matched models, the right-hand side of the inverse-U is an artifact of residual shrinkage rather than a divergence of estimation strategy.

Watch this falsifier. Get emailed when new claim-graph text bears on it.

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If this is right

  • Accuracy benchmarks alone cannot certify perceptual alignment; a model can top the RMSE leaderboard while its error patterns are among the least human-like.
  • Models trained only on physical depth still pick up some human-like biases, but none reaches the reliability of human-human agreement.
  • The trade-off is not confined to one error type: it appears in scale, shift, shear, and residual components, so it reflects overall estimation strategy rather than a single artifact.
  • Human-likeness is domain-sensitive: rankings and error-space organization are only weakly preserved between outdoor KITTI and indoor NYU scenes, so a human-like model on one domain may not be human-like on another.
  • The benchmark supplies a reusable protocol for scoring future depth models on both metric accuracy and human similarity.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the inverse-U reflects a real strategy divergence, then training a high-accuracy model to mimic human error patterns should cost RMSE on standard benchmarks; this is directly testable by fine-tuning on human judgments.
  • The residual-variance caveat suggests part of the right-hand slope may be a measurement artifact: as a model's errors shrink, the residual correlation with human errors is attenuated toward a noise floor, so a variance-matched re-analysis is needed to confirm the trade-off.
  • The authors' KITTI-specific explanation — homogeneous road-sky geometry plus wide-angle distortion — predicts that on more diverse outdoor datasets the inverse-U should flatten or shift; collecting human judgments on such data would test that prediction.
  • If human-like representations indeed improve robustness, as argued in object recognition, human-similarity scores could become a cheap proxy for out-of-distribution robustness in depth models; the paper leaves that connection unestablished.

Editorial analysis

A structured set of objections, weighed in public.

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

Referee Report

3 major / 4 minor

Summary. The paper proposes a human-centered evaluation framework for monocular depth estimation (MDE). The authors collected new human absolute-distance judgments at 16 points per image for KITTI scenes, compared 69 diverse MDE models against these judgments using partial correlations of residuals after controlling for physical depth, and further decomposed errors into affine components (scale, shift, shear, residual). They report an inverse-U relationship between metric accuracy (RMSE) and human similarity: models with accuracy around human level are most human-like, while both less accurate and more accurate models show lower similarity. The abstract and framing additionally claim a cross-domain benchmark including NYU Depth V2 data. The authors conclude that physical accuracy and human-likeness are complementary, domain-sensitive dimensions of MDE performance.

Significance. If the core trade-off claim is robust, this is a valuable contribution: it provides a large-scale outdoor human-depth dataset, a systematic comparison across 69 models, and a clear demonstration that accuracy benchmarks may not capture perceptual alignment. The paper is careful to fit per-image scale/shift alignment to physical ground truth rather than to human judgments, and the human-data collection is described in unusual detail. The release of data and analysis code would further strengthen the contribution. However, the central statistical evidence for the inverse-U is currently vulnerable to a measurement-artifact explanation, and the cross-domain framing is not fully supported by the manuscript as written.

major comments (3)
  1. [§3.3, §4.2, Table B1] The right-hand slope of the inverse-U may be a metric artifact. Human-DNN similarity is the partial correlation between residuals after regressing out physical depth. For the human-superior group, scale-recovered models have small residual variance, so any variance component not shared with human residuals (LiDAR noise, 16-point sampling, uint16 quantization, inference noise, human split-half noise) occupies a larger fraction of the residual and mechanically attenuates the correlation. The reported r=+0.69 (p<0.001) in the scale-recovered raw error, and the similar affine-component slopes, could therefore reflect shrinking residual variance rather than a genuine divergence of estimation strategies. The non-significant absolute-data right-hand slope (r=0.37, p=0.14) is consistent with this attenuation account. Please provide a noise-ceiling analysis or an amplitude-normalized similarity m
  2. [Abstract, §3.1, Appendix A.1] There is a direct numerical inconsistency: the abstract and Figure 1 state '652 KITTI and 654 NYU Depth V2 scenes,' while §3.1 and Appendix A.1 describe 328 KITTI evaluation images. Moreover, the NYU data collection is not described anywhere in this paper; it is only attributed to prior work [27]. As written, the cross-domain benchmark claim in the abstract is not supported by the methods. Please either include the full NYU data description and correct the scene counts, or revise the abstract and title claims to accurately reflect the KITTI-only scope of the new data and analyses.
  3. [§4.2 and Figure 1] The inverse-U is characterized by splitting models at the human RMSE and computing separate linear correlations within each group. This split is reasonable, but the paper should also report a continuous test of the non-monotonic relationship (e.g., quadratic regression or segmented regression with a breakpoint) to confirm that the decline on the right is statistically significant beyond a plateau. The current presentation relies on the reader accepting the human-RMSE boundary as the correct knot; a model-free test would strengthen the central claim.
minor comments (4)
  1. [Figure 1 and Figure 3 captions] The significance asterisks are mislabeled: '*:p<0.01, **:p<0.01, ***:p<0.001' should presumably be '*:p<0.05, **:p<0.01, ***:p<0.001'.
  2. [§3.3] The definition of 'partial correlation' would be clearer if it explicitly stated that both the human mean estimates and the DNN estimates are regressed on physical ground-truth depth before computing the correlation, and that for scale-recovered data these residuals are already orthogonal to depth by construction.
  3. [Table B1] The table reports many correlations without multiple-comparison correction. Given the large number of tests across components and conditions, a false-discovery-rate correction or at least a note about the risk of inflated significance would be appropriate.
  4. [Appendix B.1] The paragraph on residual error correctly notes that residual magnitudes are not comparable across models with different depth ranges. This caveat should also be reflected in the main-text discussion of affine residual components.

Circularity Check

0 steps flagged

No significant circularity: the inverse-U is an empirical measurement, not a quantity constructed from its inputs; self-citations to prior work are not load-bearing for the new KITTI result.

full rationale

The paper's central claim—that metric accuracy and human similarity exhibit an inverse-U relationship—is an observed correlation between two independently computed quantities. Human-DNN similarity is a split-half partial correlation between human and DNN residuals after regressing out physical depth (§3.3); accuracy is a scale-shift-invariant RMSE against physical ground truth (§3.3, §4.2). Neither quantity is fitted to the other, and no parameter is tuned to human judgments and then reported as a prediction. The affine decomposition fits the same linear model to humans and DNNs separately and then correlates the resulting coefficients (§3.4); this could produce a pattern but it is not a circular reduction because the coefficients are not derived from each other. The citation to the authors' prior work [27] supplies the NYU human-depth dataset and the affine-decomposition precedent, but the KITTI data collection, the 69-model evaluation, and all reported correlations are carried out in the present paper, so the self-citation is not load-bearing. The reader's concern about the right-hand slope (r=0.69) being attenuated by shrinking residual variance is a serious validity threat—the paper does not report a noise ceiling or an amplitude-normalized similarity—but it is a statistical confound, not circularity: a high-accuracy model with small residuals can in principle remain perfectly correlated with human residuals, so the observed divergence is not guaranteed by the definitions. The cross-domain abstract claim relies on NYU data cited from [27] rather than described here, which is a support/provenance gap, but not an equivalence of outputs to inputs.

Axiom & Free-Parameter Ledger

3 free parameters · 4 axioms · 0 invented entities

The benchmark introduces no invented physical entities. Its free parameters are standard per-image alignment and decomposition fits plus a screening threshold; the load-bearing assumptions are psychophysical (crowdsourced absolute-distance judgments index human depth perception) and geometric (affine form captures the relevant error structure), inherited from the authors' prior work [27] and the pictorial-space literature.

free parameters (3)
  • Per-image scale/shift alignment (s, t) = per-image, per model (328 images × 69 models)
    Least-squares fit of each DNN output to LiDAR ground truth at the 16 evaluation points (Appendix A.3). Standard MDE normalization, but the alignment is fitted on the same 16 points used for the similarity score and it directly shrinks the residuals that drive the partial-correlation metric.
  • Affine decomposition coefficients (az, ax, ay, b) = per-image, per estimator (328 images × 4 coefficients)
    Four-parameter fit of estimated depth on ground-truth depth and pixel coordinates per image (§3.4). The residual error component is defined by this fit; the trade-off is then measured on these fitted quantities.
  • Participant reliability cutoff (1.5×IQR below pooled correlation median) = 1.5×IQR
    Hand-chosen screening threshold on participant-vs-group-median correlations (Appendix A.2); excludes 157 of 890 participants. Changing this threshold changes the human benchmark.
axioms (4)
  • domain assumption Crowdsourced absolute-distance judgments (meters, with scale bar and screen calibration) reliably measure human depth perception
    The entire benchmark treats mean crowd answers as the human reference. Validation is limited to split-half partial correlation (§3.3, Figure 2B); the text reports no comparison with established psychophysical depth estimates.
  • domain assumption Affine structure (scale, shift, two shears) captures the systematic component of both human and DNN depth errors
    Adopted from [27] and the pictorial-space literature [25,53] (§3.4). If relevant biases are non-affine, the component-wise trade-off analysis is incomplete.
  • standard math Partial correlation controlling for physical depth isolates 'error patterns' and is comparable across models with different residual magnitudes
    The regression-out computation is standard, but comparability is assumed without justification; the attenuation with shrinking residual variance is the paper's weakest unsupported premise (§3.3).
  • domain assumption LiDAR-measured depth in KITTI is the correct physical reference for both humans and models
    Errors for both humans and DNNs are defined against sensor ground truth (§3.1, §4.1), even though the paper's own premise is that human perception deviates systematically from physical depth.

pith-pipeline@v1.3.0-alltime-deepseek · 19980 in / 26940 out tokens · 599468 ms · 2026-08-04T06:39:30.922271+00:00 · methodology

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Cite this review

Pith. "Pith review of Accuracy Does Not Guarantee Human-Likeness: Cross-Domain Human-Centered Benchmark in Monocular Depth Estimation." pith.science (2026). https://pith.science/paper/LNZBD65R

@misc{pith2026251208163,
  author       = {Pith},
  title        = {Pith review of: Accuracy Does Not Guarantee Human-Likeness: Cross-Domain Human-Centered Benchmark in Monocular Depth Estimation},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/LNZBD65R}},
  note         = {Machine review of arXiv:2512.08163}
}
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read the original abstract

Deep neural networks (DNNs) are increasingly used as functional models of human vision, yet standard monocular depth estimation (MDE) benchmarks largely evaluate physical accuracy rather than behavioral alignment with humans. We introduce a cross-domain behavioral benchmark that aligns newly collected human absolute-distance judgments, physical ground truth, and model predictions at 16 locations in each of 652 KITTI and 654 NYU Depth V2 scenes. Human-model similarity was measured image-wise by partial correlation between scale-and-shift-aligned estimates while controlling for physical depth, and reference results were obtained for 69 diverse MDE models. Human error patterns were highly reliable, and most models showed positive but substantially lower similarity to humans. Human similarity, however, did not increase monotonically with metric accuracy: within each dataset, high-accuracy models converged toward similar residual error structures that remained distinct from humans, while both human-similarity scores and error-space organization were only weakly preserved across datasets. Thus, physical accuracy and human-like behavior are complementary, domain-sensitive dimensions of MDE performance. Our benchmark will provide a reusable basis for assessing future models along both dimensions.

Figures

Figures reproduced from arXiv: 2512.08163 by Taiki Fukiage, Yuki Kubota.

Figure 1
Figure 1. Figure 1: Overview of our research. We first constructed a human depth evaluation dataset based on an absolute depth estimation task. [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Comparison of human and DNN error profiles for absolute (left) and scale-recovered (right) data. (A) RMSE of raw errors [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Scatter plots showing the relationship between model accuracy, quantified by scale-shift invariant RMSE, and human similarity [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Comparison of human and DNN depth estimation biases, illustrated with examples of characteristic horizontal ( [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗

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