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arxiv: 2605.07940 · v1 · submitted 2026-05-08 · 💻 cs.CV

Recognition: no theorem link

Delta-Adapter: Scalable Exemplar-Based Image Editing with Single-Pair Supervision

Baoquan Zhao, Han Fu, Jiacheng Chen, Li Qing, Songze Li, Wei Liu, Xudong Mao, Yanyan Liang

Pith reviewed 2026-05-11 03:28 UTC · model grok-4.3

classification 💻 cs.CV
keywords exemplar-based image editingsingle-pair supervisionsemantic deltaadaptervision encoderimage transformationgeneralizationcontent consistency
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The pith

Delta-Adapter learns image edits from single source-target pairs by extracting a semantic delta and injecting it through an adapter.

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

The paper demonstrates that exemplar-based image editing can be trained using only one pair of images to define each transformation, rather than needing two separate pairs that share the same edit. A pre-trained vision encoder computes the semantic delta as the feature difference between the source and target, which encodes the desired change. This delta is then supplied to an existing editing model through a Perceiver-based adapter, so the target image stays hidden during training and can act as the direct supervision signal. The setup draws on large existing datasets and adds a consistency loss to keep the output's semantic shift aligned with the input delta, resulting in more accurate edits and better handling of edit types not seen in training.

Core claim

By extracting a semantic delta from an exemplar pair using a pre-trained vision encoder and injecting it into a pre-trained image editing model via a Perceiver adapter, the method achieves faithful transformation transfer under single-pair supervision, with a semantic delta consistency loss ensuring the generated output matches the ground-truth delta, yielding higher editing accuracy and content consistency than pair-of-pairs baselines on both seen and unseen tasks.

What carries the argument

The semantic delta, computed as the feature difference from a pre-trained vision encoder between source and target images in an exemplar pair, which is injected into the editing model via a Perceiver-based adapter to guide the transformation without direct exposure to the target image.

If this is right

  • Training can scale to larger datasets because only one pair per edit type is required instead of matched pairs.
  • Editing accuracy and content preservation improve compared with methods that demand pair-of-pairs supervision.
  • Generalization to previously unseen edit types becomes stronger through the transferable delta representation.
  • The process operates without any textual description of the desired change.

Where Pith is reading between the lines

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

  • The same delta extraction could extend to video or 3D editing if comparable feature differences can be computed across frames or models.
  • Multiple deltas might be combined to compose complex or sequential edits within one forward pass.
  • The approach suggests that pre-trained encoders already contain enough edit semantics to reduce the need for custom paired data in other transformation tasks.

Load-bearing premise

The semantic delta extracted by the vision encoder faithfully encodes the intended visual transformation and remains transferable when injected into the editing model for new images.

What would settle it

Apply the trained adapter with a semantic delta from an exemplar pair to a new query image and check whether the feature difference between the generated output and the query matches the supplied delta; mismatch on held-out pairs would show the transfer has failed.

Figures

Figures reproduced from arXiv: 2605.07940 by Baoquan Zhao, Han Fu, Jiacheng Chen, Li Qing, Songze Li, Wei Liu, Xudong Mao, Yanyan Liang.

Figure 1
Figure 1. Figure 1: Exemplar-based image editing with Delta-Adapter. Our method learns complex transforma [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Overview of Delta-Adapter. Given a single exemplar pair {a, a′}, we first extract patch￾level SigLIP features and compute a normalized semantic delta ∆a→a′ = LN(fa′ ) − LN(fa). The delta is refined via a gated residual projection and converted into edit tokens through a Perceiver resampler. These tokens are injected into a frozen DiT-based editing backbone via decoupled cross￾attention to reconstruct the t… view at source ↗
Figure 3
Figure 3. Figure 3: Qualitative comparison on seen editing tasks. We compare Delta-Adapter with Relation￾Adapter [15], LoRWeB [33], and Edit Transfer [8]. Delta-Adapter more faithfully captures the edit semantics implied by the exemplar pair and applies them to the query image, while better preserving its underlying structure and identity. 5.2 Results Qualitative evaluation [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Qualitative comparison on unseen editing tasks. We compare Delta-Adapter with RelationAdapter [15], LoRWeB [33], and VisualCloze [29]. Across diverse unseen transformations, Delta-Adapter produces outputs that are semantically aligned with the exemplar edit [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Continuous image editing with Delta￾Adapter. Source (a) Target (a ′ ) Query (b) w/o TTA w/ TTA [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 7
Figure 7. Figure 7: Additional editing results produced by Delta-Adapter. Given an exemplar pair, our method infers the underlying transformation and faithfully applies it to unseen query images. 16 [PITH_FULL_IMAGE:figures/full_fig_p016_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Additional qualitative comparison on seen editing tasks. We compare Delta-Adapter with RelationAdapter [15], LoRWeB [33], and Edit Transfer [8]. Delta-Adapter more faithfully captures the edit semantics implied by the exemplar pair and applies them to the query image, while better preserving its underlying structure and identity. 17 [PITH_FULL_IMAGE:figures/full_fig_p017_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Additional qualitative comparison on unseen editing tasks. We compare Delta-Adapter with RelationAdapter [15], LoRWeB [33], and VisualCloze [29]. Across diverse unseen trans￾formations, Delta-Adapter produces outputs that are semantically aligned with the exemplar edit, demonstrating superior generalization over the baselines. 18 [PITH_FULL_IMAGE:figures/full_fig_p018_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Qualitative comparison with Nano Banana 2 [12] and GPT-Image-2 [37]. Both models frequently fail to capture the intended transformation (rows 1–3) and tend to leak appearance cues from the exemplar images into the output (rows 4–6). 19 [PITH_FULL_IMAGE:figures/full_fig_p019_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Qualitative comparison with PairEdit [32]. PairEdit struggles to capture complex edits from the exemplar pair. Source (a) Target (a ′ ) Query (b) Result [PITH_FULL_IMAGE:figures/full_fig_p020_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Failure cases of Delta-Adapter. Our method struggles with editing tasks that require precise text rendering. When the exemplar pair contains textual content, the model produces characters that are inconsistent with those in the exemplar. 20 [PITH_FULL_IMAGE:figures/full_fig_p020_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: System prompt used for GPT-based automated evaluation of editing accuracy (GPT-A) [PITH_FULL_IMAGE:figures/full_fig_p021_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: Visualization of recovered clean latents during four-step denoising. Given a single exemplar pair (a, a′ ) and a query image b, we visualize the decoded clean latent estimate zˆ0 predicted at each denoising step of our four-step backbone. Even at the early denoising stages, the recovered zˆ0 already forms coherent image structures and reflects the intended edit semantics, providing sufficiently reliable v… view at source ↗
Figure 15
Figure 15. Figure 15: An example question from the user study. Each question follows a two-alternative forced￾choice format: participants view an exemplar pair (a, a′ ), a query image b, and two anonymized candidate edits produced by Delta-Adapter and a baseline, randomly assigned to positions A and B. Participants select the candidate that better reflects the transformation demonstrated by the exemplar pair while preserving t… view at source ↗
read the original abstract

Exemplar-based image editing applies a transformation defined by a source-target image pair to a new query image. Existing methods rely on a pair-of-pairs supervision paradigm, requiring two image pairs sharing the same edit semantics to learn the target transformation. This constraint makes training data difficult to curate at scale and limits generalization across diverse edit types. We propose Delta-Adapter, a method that learns transferable editing semantics under single-pair supervision, requiring no textual guidance. Rather than directly exposing the exemplar pair to the model, we leverage a pre-trained vision encoder to extract a semantic delta that encodes the visual transformation between the two images. This semantic delta is injected into a pre-trained image editing model via a Perceiver-based adapter. Since the target image is never directly visible to the model, it can serve as the prediction target, enabling single-pair supervision without requiring additional exemplar pairs. This formulation allows us to leverage existing large-scale editing datasets for training. To further promote faithful transformation transfer, we introduce a semantic delta consistency loss that aligns the semantic change of the generated output with the ground-truth semantic delta extracted from the exemplar pair. Extensive experiments demonstrate that Delta-Adapter consistently improves both editing accuracy and content consistency over four strong baselines on seen editing tasks, while also generalizing more effectively to unseen editing tasks. Code will be available at https://delta-adapter.github.io.

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

3 major / 2 minor

Summary. The manuscript proposes Delta-Adapter for exemplar-based image editing that operates under single-pair supervision. A pre-trained vision encoder extracts a semantic delta (feature difference) between a source-target exemplar pair; this delta is injected into a frozen pre-trained editing backbone via a Perceiver-based adapter. Because the target image is never shown to the model during inference, it can be used directly as supervision. A semantic delta consistency loss is added to encourage the output to preserve the same transformation. The central claim is that this yields higher editing accuracy and content consistency than four baselines on both seen and unseen editing tasks while enabling training on large-scale datasets that lack pair-of-pairs structure.

Significance. If the quantitative claims hold, the work would be significant: it removes the pair-of-pairs data requirement that has limited scaling of exemplar-based editors, demonstrates that a lightweight adapter can transfer semantic deltas across tasks, and reports improved generalization to unseen edits. The approach is parameter-efficient and re-uses existing large editing corpora, which could accelerate progress in controllable image synthesis.

major comments (3)
  1. [§3.2] §3.2 (semantic delta extraction): The method treats the difference of frozen encoder features as a faithful, transferable encoding of the visual transformation. This assumption is load-bearing for both the single-pair supervision claim and the unseen-task generalization result, yet the manuscript provides no analysis of what information is preserved or lost (e.g., for shape vs. color vs. style edits) and no failure-case study when the encoder representation is known to be entangled.
  2. [§4] §4 (experiments): The abstract and introduction assert “consistent gains” and “more effective generalization” over four baselines, but the evaluation section lacks reported numerical tables, ablation results for the consistency loss, statistical significance, or error bars. Without these, the magnitude and reliability of the claimed improvements cannot be assessed.
  3. [§3.3] §3.3 (adapter injection): The Perceiver adapter is presented as the mechanism that enables delta transfer without ever exposing the target image. However, the training objective still relies on the quality of the upstream frozen encoder; no controlled experiment isolates whether performance degrades when the encoder is replaced by a weaker or differently trained feature extractor.
minor comments (2)
  1. [§3.1] Notation for the semantic delta (Δ) is introduced without an explicit equation; adding a numbered equation would improve clarity.
  2. [Figure 2] Figure 2 (method overview) would benefit from an explicit arrow or label showing that the target image is used only for the consistency loss and never as model input.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive feedback and for recognizing the potential impact of our work on scalable exemplar-based editing. We address each major comment below, providing clarifications and committing to revisions where appropriate to strengthen the manuscript.

read point-by-point responses
  1. Referee: [§3.2] §3.2 (semantic delta extraction): The method treats the difference of frozen encoder features as a faithful, transferable encoding of the visual transformation. This assumption is load-bearing for both the single-pair supervision claim and the unseen-task generalization result, yet the manuscript provides no analysis of what information is preserved or lost (e.g., for shape vs. color vs. style edits) and no failure-case study when the encoder representation is known to be entangled.

    Authors: We agree that additional analysis would enhance the paper's rigor. In the revised manuscript, we will add a dedicated subsection analyzing the semantic delta's preservation of information across edit categories (shape, color, style) through feature visualizations, similarity metrics, and qualitative examples. We will also include a failure-case study section discussing limitations when the encoder features are entangled, such as in intricate style or geometric transformations, and how the consistency loss mitigates some issues. This will better support the claims of transferability. revision: yes

  2. Referee: [§4] §4 (experiments): The abstract and introduction assert “consistent gains” and “more effective generalization” over four baselines, but the evaluation section lacks reported numerical tables, ablation results for the consistency loss, statistical significance, or error bars. Without these, the magnitude and reliability of the claimed improvements cannot be assessed.

    Authors: We acknowledge the need for more comprehensive quantitative evaluation. The revised version will include detailed numerical tables presenting all metrics for the four baselines on both seen and unseen tasks. We will add ablation studies specifically for the semantic delta consistency loss, showing its impact on performance. Additionally, we will report statistical significance (e.g., p-values from t-tests) and error bars computed over multiple random seeds to demonstrate the reliability of the improvements. revision: yes

  3. Referee: [§3.3] §3.3 (adapter injection): The Perceiver adapter is presented as the mechanism that enables delta transfer without ever exposing the target image. However, the training objective still relies on the quality of the upstream frozen encoder; no controlled experiment isolates whether performance degrades when the encoder is replaced by a weaker or differently trained feature extractor.

    Authors: We appreciate this point on isolating the encoder's role. In the updated manuscript, we will incorporate a controlled experiment ablating the encoder by substituting it with weaker alternatives, such as a shallower network or one trained on different data. This will quantify performance degradation and highlight the adapter's ability to leverage high-quality deltas while showing the method's sensitivity to encoder quality. revision: yes

Circularity Check

0 steps flagged

No significant circularity; method is architecturally independent of its empirical claims

full rationale

The paper proposes Delta-Adapter as a new architecture: semantic delta extracted once from a frozen pre-trained vision encoder, injected via a Perceiver adapter into a frozen editing backbone, trained with image-level supervision on the held-out target plus an auxiliary consistency loss on deltas. None of these components is defined in terms of the final performance metric or the generalization result. The single-pair supervision follows directly from withholding the target image from the forward pass (a standard design choice), and the consistency loss is an explicit regularizer rather than a tautology that forces the output by construction. No self-citation chain, uniqueness theorem, or fitted parameter renamed as prediction appears in the derivation. The reported gains on seen and unseen tasks remain empirical claims that can be falsified by new experiments.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 1 invented entities

The approach rests on the assumption that a pre-trained vision encoder produces a transferable semantic delta and that the Perceiver adapter can inject it without direct target exposure. No free parameters are explicitly fitted in the abstract description.

axioms (2)
  • domain assumption A pre-trained vision encoder can extract a semantic delta that encodes the visual transformation between source and target images.
    Invoked when the method extracts the delta to serve as the edit representation.
  • domain assumption Injecting the semantic delta via a Perceiver-based adapter into a pre-trained editing model enables faithful transfer without exposing the target image.
    Core premise that allows single-pair supervision.
invented entities (1)
  • semantic delta no independent evidence
    purpose: Compact representation of the edit transformation extracted from the exemplar pair.
    New construct introduced to enable single-pair training; no independent evidence provided beyond the method itself.

pith-pipeline@v0.9.0 · 5564 in / 1347 out tokens · 55536 ms · 2026-05-11T03:28:36.788925+00:00 · methodology

discussion (0)

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