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REVIEW 4 major objections 6 minor 1 cited by

Just Noticeable Difference for Large Multimodal Models

T0 review · 4 major / 6 minor · reviewed 2026-08-06 · deepseek-v4-flash

Pith's one-line read Current large multimodal models have measurable visual blind spots, and this paper quantifies them as a just noticeable difference (LMM-JND) using a new 489k-stimulus dataset.

desk verdict The first systematic JND measurement for LMMs is real work with a useful dataset, but the filter that defines every threshold needs validation before the numbers are trusted. read the letter →

arxiv 2507.00490 v2 pith:WX7F77GK submitted 2025-07-01 cs.CV eess.IV

classification cs.CVeess.IV
keywords justnoticeabledifferencelargemultimodalmodelsvisualblindspotsperceptualthresholdVPA-JNDdatasetrobustnesshumansystemperception
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 tries to establish that current large multimodal models (LMMs) have systematic, measurable visual blind spots: there is a minimum amount of image change, called the LMM-JND, below which a model's response does not change. To support this, the authors build VPA-JND, a dataset of 21,598 reference images and 489,065 stimuli spanning low-level distortions, injected content, and 3D viewpoint changes, and run 20 models through a determination pipeline. They report that even the best model needs a noticeably larger change than humans on all three stimulus families, with the largest gap in content-injection tasks. The paper also argues that the ratio between language and vision backbone sizes correlates with perceptual thresholds, which would give architects a concrete lever for improving visual acuity.

What carries the argument

The central object is LMM-JND, defined as the minimal stimulus change such that the model's response to a reference-image pair first differs from its response to the previous pair in a sequential paired-comparison ladder; the paper measures the 1st JND and also locates higher-order redundancy zones. The pipeline that carries the argument works by presenting an anchor image and progressively more distorted images, requiring the model to emit a predefined flag token plus an analysis, discarding outputs where the flag and analysis are semantically inconsistent according to a natural-language-inference filter, and applying a sliding-window regularizer of width 3 so a single unstable positive response does not count as a JND. The Minimum Response Variation (MRV) then averages, over all reference images, the smallest distortion level at which the filtered response flips. The VPA-JND dataset supplies the stimulus ladders: seven low-level distortions, two content-injection families including masks and watermarks, and 3D field-of-view changes generated in an optical simulator.

What would settle it

Take the models whose invalid-response rate exceeds 80%, relabel their discarded outputs by human judges, and recompute MRV from the relabeled responses; if thresholds drop or model rankings flip substantially, the NLI filter, rather than the visual system, set the measured just noticeable difference.

Watch

Extended reading notes

Core claim

On the paper's own terms, the central discovery is that LMM-JND exists and is large. The best model, Gemini 2.0 Flash, reaches an average 1st-JND of 12.73 across all stimuli, while humans need levels of roughly 12.11 on low-level distortions excluding banding, 1.44 on content injection, and 1.48 on 3D field-of-view changes, making humans 26.2%, 89.0%, and 40.8% more sensitive respectively. The paper interprets these results as evidence that state-of-the-art LMMs fall significantly short of human-level visual performance, particularly at detecting injected or tampered content, and that this creates security risks because sub-threshold edits can alter what a model receives without altering its output. It also finds that perceptual thresholds correlate with the parameter ratio of the language backbone to the vision backbone, and that Qwen2.5-VL-3B, a small model, beats many larger ones on blur, JPEG, watermark, and distance detection.

Load-bearing premise

The whole measurement treats a model as having seen a difference only when its written answer contains the expected yes/no token and a separate text-comprehension model agrees with that token; outputs that are garbled, self-contradictory, or incomplete are discarded, so the measured thresholds depend on a language filter rather than on vision alone.

Editorial extensions

If this is right

  • Below-threshold distortions are invisible to the tested LMMs in the paper's setup, so LMM-JND can define a perceptual-lossless compression level for model inputs; on a 14-subtask VQA test, JPEG compression below the threshold left GPT-4o and Gemini 2.0 Flash responses unchanged while saving bits.
  • Content injection is the largest blind spot: the best model needs about 8.4 to 20.4 of the 50 distortion levels to notice masks, QR-code watermarks, and text watermarks, whereas humans need roughly 1.0 to 1.7 levels, so manipulated images can pass unnoticed.
  • LMM-JND is task-dependent and non-transitive, so evaluating it requires sequential paired comparisons rather than a single global threshold.
  • Scale alone does not predict acuity: Qwen2.5-VL-3B outperforms much larger models on blur, JPEG, watermark, and distance tasks, while many small models fail to respond at all and show 1st JND near the maximum distortion level.
  • Models with lower language-to-vision parameter ratios tend to have finer perceptual granularity, suggesting that enlarging the vision backbone, once the language backbone is large enough, is a promising direction for improving visual acuity.

Reading between the lines

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

  • Beyond the paper's claims, the same thresholding logic could become a red-team audit tool: probe a deployed model with a fixed stimulus ladder and report its MRV as a security specification, since sub-threshold tampering would be invisible to that model.
  • The paper's NLI-based filter probably mixes language ability into a supposedly visual measure; a testable extension is to compare text-based MRV against embedding-distance thresholds from the frozen vision encoder alone to separate visual acuity from verbal reporting ability.
  • The language-to-vision backbone ratio correlation is suggestive rather than causal; a direct test would hold the language backbone fixed and scale only the vision encoder across several sizes to see whether perceptual thresholds drop monotonically.
  • The same sequential paired-comparison protocol should transfer to audio or video inputs as long as the model can compare two samples, making LMM-JND a unified modality-wide sensitivity metric.
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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

4 major / 6 minor

Summary. The paper proposes LMM-JND, a notion of just noticeable difference for large multimodal models (LMMs), defined as the minimal stimulus change at which an LMM's response to a paired comparison first changes. It introduces the VPA-JND dataset of 21,598 reference images and 489,065 stimuli covering low-level distortions, content injection, and 3D field-of-view changes, and evaluates 16 open-source and 4 proprietary LMMs. The authors report that humans outperform the best LMM by 26.2%, 89.0%, and 40.8% on the low-level, content-injection, and 3D FoV perspectives respectively, argue for a correlation between the language/vision backbone scale ratio and perceptual thresholds, and demonstrate downstream uses in homogeneity testing and LMM-JND-guided JPEG compression.

Significance. The dataset and evaluation protocol are substantial assets: the coverage of 12 stimulus types, 20 models, and 489k stimuli is far larger than prior machine-JND studies, and the release of code and data will enable further work. The qualitative conclusion that current LMMs have systematically coarser visual discrimination than humans is plausible and receives independent support from the spot-the-difference results (Sec. 6.2, Fig. 11) and the visual-encoder cosine-similarity analysis (Sec. 3, Fig. 4). If the measurement pipeline is validated, LMM-JND would be a useful benchmark for perceptual acuity, robustness, and security evaluation. However, the exact threshold values, model rankings, and headline percentage gaps are currently only as reliable as the response-validity filter used to compute them.

major comments (4)
  1. [Sec. 4.2, Algorithm 1 and Eq. (8)] The response-validity filter is load-bearing for every LMM-JND value in Table 5. In Algorithm 1, a stimulus is counted as perceived only when f+ is present in the flag tokens and NLI(Raux, G|Q) is True; all other outputs, including f- answers, antilogy, gibberish, and deficiency, simply cause the search to continue and are therefore treated as 'not perceived'. Since Fig. 12 reports invalid-response rates above 80% for several models (e.g., the DeepSeek-VL2 family, Qwen2-VL-2B/7B, and LLaVA-OneVision-0.5B/7B), their Table 5 thresholds may substantially reflect output-format compliance rather than visual sensitivity. In addition, the NLI acceptance threshold is never stated, and BART-MNLI is applied to long, mixed flag+analysis generations without any validation against human judgments; both false accepts and false rejects are possible. I request a human audit of a stratified sample of accepted/rejected responses, a report of the NLI threshold, and a sensitivity analysis varying that threshold, since the per-model magnitudes and rankings in Table 5 all depend on this step.
  2. [Sec. 6.2, Table 5 and Sec. 6.1] The headline human-vs-LMM gaps (26.2%, 89.0%, and 40.8%) and the model rankings are point estimates without any uncertainty quantification. LMM outputs are stochastic, and the human thresholds come from only 12 campus participants, yet no confidence intervals, bootstrap estimates, or significance tests are reported. This is particularly important for statements such as 'Gemini 2.0 Flash surpasses the other proprietary LMMs by a substantial margin' and for the claim that the best LMM approaches human level on angle and distance tasks. Please provide per-model and per-stimulus confidence intervals, or at least a bootstrap analysis, and report the number of repeated trials used for each Table 5 cell.
  3. [Sec. 4.2, Eq. (6) and Sec. 6.5, Tables 8-9] The homogeneity claim in Section 6.5 is partly circular. Since LMM-JND is defined in Eq. (6) as the first level at which the response changes, the statement 'changes below the LMM-JND do not change the response' is true by construction for the same distortion and same query. The genuinely empirical content of Section 6.5 is instead the cross-distortion additivity test: whether combinations of below-threshold distortions from different dimensions remain imperceptible. The paper should be rephrased to distinguish this definitional property from the empirical finding, and the tables should be interpreted as additivity tests rather than as evidence for a newly discovered 'homogeneous property' of LMMs.
  4. [Sec. 6.4, Fig. 18 and Tab. 7] The claimed 'notable correlation' between the language/vision backbone parameter ratio and the 1st JND is not supported by the reported statistics. The evidence consists of four model families, each with only two to three sizes, and the comparison confounds language-backbone type, training data, visual-token count, and release date. No correlation coefficient, confidence interval, or significance test is given for Fig. 18, and the 'golden ratio' language in the text is an overinterpretation of a fitted curve. Please report formal correlations with uncertainty, control for the confounds above, and temper the architectural-design conclusions accordingly.
minor comments (6)
  1. [Sec. 3, Eq. (1)] The text says the contrast parameter k is set to '[5 : 0.5 : 50] (which means values ranging from 5 to 0.5 with 50 levels)', which is inconsistent both with the bracket notation and with the reported distortion levels; please clarify the range, step, and number of levels.
  2. [Table 5 and Eq. (8)] The convention for models with no detected positive response is not stated; Table 5 uses entries like '>50' and '>100', but Eq. (8) takes a minimum over a set that may be empty. Please define the convention explicitly.
  3. [Fig. 14 and Sec. 6.3] The caption of Fig. 14 reports 'Comparative errors (%) w.r.t. the width of the regularizer', but the text in Sec. 6.3 refers to 'response length' when citing Fig. 14; please align the caption, the panel labels, and the text.
  4. [Eq. (7) and Algorithm 1] Equation (7) defines G using both f+ and f-, but Algorithm 1 only tests for f+; please explain how negative answers and multiple-choice formats are processed in the actual implementation.
  5. [Tab. 1 and Sec. 5] The number of distortion types is reported inconsistently: the abstract says 12 distortion types, Table 1 says 'Combination14', and Table 5 lists three content-injection columns (Mask, watermark QR, watermark text) while the text describes two content-injection patterns; please reconcile these counts.
  6. [Tab. 6 and Sec. 6.2] Please state how the PSNR and SSIM values at the 1st JND are computed, since these values are used to support the claim that the blur column shows higher structural fidelity at the JND point.

Circularity Check

1 steps flagged · score 2.0 of 10

Central thresholds and human-vs-model comparisons are empirical; only the homogeneity framing restates the JND definition.

  1. self definitional [Sec. 6.5 (Homogeneous Property Test), closing paragraph]
    "Through these experiments, we demonstrate that the generated LMM-JND possesses similar homogeneity characteristics to HVS-JND, i.e., distortions below the LMM-JND threshold can be tolerated by the LMM."

    Equation (6) defines LMM-JND as the first level XN at which M(X0,Xk) ~= M(X0,Xk-1) ceases to hold, and Algorithm 1 scans levels until the flag+NLI criterion first fires. Hence 'changes below LMM-JND do not change the response' is entailed by the definition and the algorithm for the same image, distortion dimension, and query; asserting it as a demonstrated property is a restatement rather than an empirical result. The surrounding cross-distortion contamination experiments (Tabs. 8-9) do test whether sub-threshold distortions in different dimensions combine to cross threshold and are not tautological, so this step is only partially circular and is not load-bearing for the headline human-vs-model thresholds.

full rationale

The paper's central quantitative claims are measurements, not fitted predictions: MRV/LMM-JND values in Tab. 5 are obtained by the defined pipeline (Eqs. 6-8, Algorithm 1), and the human thresholds come from a separate subjective study. The headline gaps (26.2%, 89.0%, 40.8%) compare these measured quantities; any protocol mismatch between human and LMM measurement is a validity concern, not circularity. The compression experiments in Sec. 6.6 are a genuine transfer test: Rrc on MME VQA tasks is not forced to be zero by Eq. 8, and indeed Qwen2.5-VL-7B shows nonzero response changes at its near-MRV JPEG level, so the zero Rrc for GPT-4o and Gemini is an empirical result. The language/vision backbone correlation (Fig. 18) is a descriptive observation, and the paper explicitly conditions its conclusion on 'a sufficiently large language backbone to ensure low response error,' acknowledging the language-output confound rather than hiding it. The self-citations that appear (e.g., BAND-2k [48], InternVL2.5 [63], Q-Bench [80]) supply datasets, models, or prompt designs; they are not invoked as uniqueness theorems or as the sole justification for the paper's central claims. The only definitional element found is the homogeneity statement in Sec. 6.5, which re-states the defining property of LMM-JND for the single-distortion case; because the paper's main findings do not depend on that tautology, the overall circularity is low.

Assumptions & free parameters 2 free parameters · 4 assumptions · 0 invented entities

No new physical or architectural entities are introduced. LMM-JND is a definitional measurement concept, and VPA-JND is a dataset artifact. The free parameters are procedural choices (window width, NLI threshold) that affect the measured thresholds but are not fitted to the data. The assumptions are mostly domain and procedural.

free parameters (2)
  • sliding window width w = 3
    Chosen in Sec. 6.1 as a trade-off between computational overhead and error rate (Fig. 14). Affects the JND determination results in Algorithm 1.
  • NLI consistency threshold = not specified
    The BART/MNLI model is used to filter analyses, but the probability cutoff for accepting a response as consistent is not given. This threshold influences which responses are counted as valid in Eq. 7 and Algorithm 1.
assumptions (4)
  • domain assumption An LMM must natively support multi-image input for the JND determination to be valid.
    Stated in Sec. 4.1 and Fig. 5. The paired-comparison pipeline relies on this capability.
  • domain assumption The BART model trained on MultiNLI reliably detects semantic contradictions between an LMM's flag token and its analysis.
    Used throughout the pipeline (Sec. 6.1 and Eq. 7). If this assumption fails, the computed LMM-JND values are unreliable.
  • domain assumption Human JND measurements from 12 campus participants with normal eyesight represent human-level perception for comparison.
    Sec. 6.1 'Human-Level Performance'. The human performance row in Tab. 5 is derived from this small, non-random sample.
  • domain assumption The Weber-Fechner law justifies scaling mask size in logarithmic-like steps.
    Sec. 5.1: 'cf. Weber-Fechner law in psychophysics'. This is a background modeling assumption for stimulus generation, not a derived result.

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Cite this review

Pith. "Pith review of Just Noticeable Difference for Large Multimodal Models." pith.science (2026). https://pith.science/paper/WX7F77GK

@misc{pith2026250700490,
  author       = {Pith},
  title        = {Pith review of: Just Noticeable Difference for Large Multimodal Models},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/WX7F77GK}},
  note         = {Machine review of arXiv:2507.00490}
}
read the original abstract

Just noticeable difference (JND), the minimum change that the human visual system (HVS) can perceive, has been studied for decades. Although recent work has extended this line of research into machine vision, there has been a scarcity of studies systematically exploring its perceptual boundaries across multiple tasks and stimulus types, particularly in the current era of rapidly advancing large multimodal models (LMMs), where studying the multifaceted capabilities of models has become a mainstream focus. Moreover, the perceptual defects of LMMs are not investigated thoroughly, resulting in potential security issues and suboptimal response efficiency. In this paper, we take an initial attempt and demonstrate that there exist significant visual blind spots in current LMMs. To systemically quantify this characteristic, we propose a new concept, {\bf LMM-JND}, together with its determination pipeline. Targeting uncovering the behavior commonalities in HVS-aligned visual perception tasks, we delve into several LMM families and construct a large-scale dataset, named VPA-JND, which contains 21.5k reference images with over 489k stimuli across 12 distortion types, to facilitate LMM-JND studies. VPA-JND exposes areas where state-of-the-art LMMs, including GPT-4o and the InternVL2.5 series, struggle with basic comparison queries and fall significantly short of human-level visual performance. We further explore the effects of vision and language backbones and find a notable correlation between their design philosophy that may instruct the future refinement of LMMs for their visual acuity. Together, our research underscores the significance of LMM-JND as a unique perspective for studying LMMs, and predictable LMM-JND is crucial for security concerns. This work will be available at https://github.com/zijianchen98/LMM-JND.

Figures

Figures reproduced from arXiv: 2507.00490 by the authors.

Figure 1
Figure 1. Illustration of different JND modelings. Mathematically, the fidelity [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Examples of the minimal distortion level that can be perceived ( [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. An example of hallucination in answers during the response [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figures from the paper (16 more)
Figure 4
Figure 4. Figure 4: The cosine similarity between the original image embedding and [PITH_FULL_IMAGE:figures/full_fig_p005_4.png]
Figure 5
Figure 5. Figure 5: The overall determination pipeline of LMM-JND. To be eligible for [PITH_FULL_IMAGE:figures/full_fig_p006_5.png]
Figure 6
Figure 6. Figure 6: Overview of the proposed visual perception alignment JND dataset ( [PITH_FULL_IMAGE:figures/full_fig_p009_6.png]
Figure 7
Figure 7. Figure 7: Feature distribution comparisons among three considered evalua [PITH_FULL_IMAGE:figures/full_fig_p009_7.png]
Figure 8
Figure 8. Figure 8: Workflow of the subjective JND assessment study. All experiments [PITH_FULL_IMAGE:figures/full_fig_p010_8.png]
Figure 9
Figure 9. Figure 9: Pearson correlation between results across different dimensions. [PITH_FULL_IMAGE:figures/full_fig_p011_9.png]
Figure 10
Figure 10. Figure 10: LMM-JND curves of several randomly selected stimuli for six representative LMMs. The reference images and their distorted versions are [PITH_FULL_IMAGE:figures/full_fig_p012_10.png]
Figure 11
Figure 11. Figure 11: Benchmark results on two spot-the-difference test sets. Among [PITH_FULL_IMAGE:figures/full_fig_p012_11.png]
Figure 12
Figure 12. Figure 12: The incidence (%) of problematic responses during LMM-JND determination. The values are split by antilogy, gibberish, deficiency, and [PITH_FULL_IMAGE:figures/full_fig_p013_12.png]
Figure 13
Figure 13. Figure 13: The average word length in the responses of 20 LMMs evaluated in terms of low-level distortion, content-injection, and 3D FoV perspectives. [PITH_FULL_IMAGE:figures/full_fig_p013_13.png]
Figure 14
Figure 14. Figure 14: Comparative errors (%) w.r.t. the width of the regularizer. 6.3 Analysis of LMM-JND Acquisition Process Response Error Analysis. We further report the occurrence rate of response error during the JND determination process in [PITH_FULL_IMAGE:figures/full_fig_p013_14.png]
Figure 15
Figure 15. Figure 15: Ablation experiments on the enhancement of perceptual granularity after applying explicit prompting for low-level stimuli. [PITH_FULL_IMAGE:figures/full_fig_p014_15.png]
Figure 16
Figure 16. Figure 16: Visualization of the feature intensity distribution of different stimuli [PITH_FULL_IMAGE:figures/full_fig_p014_16.png]
Figure 17
Figure 17. Figure 17: The average cosine similarity between the visual embeddings of [PITH_FULL_IMAGE:figures/full_fig_p014_17.png]
Figure 18
Figure 18. Figure 18: 1 st JND versus the parameter ratio of the language backbone (ParamL) to the visual backbone (ParamV ). The red dotted curves show the fitted optimization direction of the perception granularity for large models (72B/78B). proportional to the model scale, except for Q…
Figure 19
Figure 19. Figure 19: Illustration of different textual attacks and the response change ratio [PITH_FULL_IMAGE:figures/full_fig_p016_19.png]

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Pith tools

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