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arxiv: 2604.21743 · v1 · submitted 2026-04-23 · 💻 cs.AI · cs.CV

Bridging the Training-Deployment Gap: Gated Encoding and Multi-Scale Refinement for Efficient Quantization-Aware Image Enhancement

Dat To-Thanh , Nghia Nguyen-Trong , Hoang Vo , Hieu Bui-Minh , Tinh-Anh Nguyen-Nhu This is my paper

Pith reviewed 2026-05-09 22:02 UTC · model grok-4.3

classification 💻 cs.AI cs.CV
keywords image enhancementquantization-aware trainingmobile deploymentgated encodingmulti-scale refinementhierarchical networklow-precision inferencetraining-deployment gap
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The pith

A hierarchical network using gated encoder blocks and multi-scale refinement with quantization-aware training maintains high image quality after low-precision conversion for mobile use.

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

The paper aims to solve the mismatch where deep image enhancement models lose quality when converted to the low-precision formats required by mobile hardware. It builds a hierarchical architecture that includes gated encoder blocks to select relevant features and multi-scale refinement to keep fine details, then trains the entire model with quantization-aware training so it learns to compensate for precision loss during the process rather than after. This setup is intended to deliver visually faithful enhanced images while using little enough computation to run on ordinary phones. A sympathetic reader would care because it targets a practical barrier that stops advanced enhancement from working well in real-world mobile cameras and apps.

Core claim

The central claim is that a hierarchical network with gated encoder blocks for selective feature processing and multi-scale refinement for detail recovery, when trained end-to-end under quantization-aware training, successfully adapts to low-bit representations and thereby prevents the quality degradation that normally occurs when standard enhancement models are quantized for deployment on mobile devices.

What carries the argument

Gated encoder blocks and multi-scale refinement inside a hierarchical architecture, trained with quantization-aware training to simulate and adapt to low-precision effects.

If this is right

  • The model produces high-fidelity enhanced images while keeping computational cost low enough for standard mobile devices.
  • Quantization-aware training eliminates the typical quality drop seen with post-training quantization on enhancement tasks.
  • The architecture enables practical deployment of deep-learning-based image enhancement directly on phone hardware.
  • The approach avoids reliance on additional post-processing steps or device-specific tuning after training.

Where Pith is reading between the lines

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

  • The same gated and multi-scale structure might transfer to other low-level vision tasks that require edge deployment, such as denoising or super-resolution.
  • Further experiments could check whether the method scales to even lower bit widths like 4-bit without retraining the refinement stages.
  • Integration with existing mobile inference engines could be tested to measure real latency gains on common chipsets.

Load-bearing premise

That gated encoder blocks and multi-scale refinement will preserve enough fine-grained features for quantization-aware training to avoid quality loss without needing extra post-processing or per-architecture adjustments.

What would settle it

A side-by-side test on a mobile benchmark dataset measuring PSNR or visual fidelity of the proposed model after quantization versus the same baseline models after standard post-training quantization.

Figures

Figures reproduced from arXiv: 2604.21743 by Dat To-Thanh, Hieu Bui-Minh, Hoang Vo, Nghia Nguyen-Trong, Tinh-Anh Nguyen-Nhu.

Figure 1
Figure 1. Figure 1: The proposed hybrid architecture for RGB image enhancement. The model features a three-scale hierarchical structure compris [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Quantization-Aware Training (QAT) and inference pipelines. (Top) QAT simulates low-precision effects via FakeQuant nodes [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Qualitative results on image 01 of the full-size test sub [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
read the original abstract

Image enhancement models for mobile devices often struggle to balance high output quality with the fast processing speeds required by mobile hardware. While recent deep learning models can enhance low-quality mobile photos into high-quality images, their performance is often degraded when converted to lower-precision formats for actual use on mobile phones. To address this training-deployment mismatch, we propose an efficient image enhancement model designed specifically for mobile deployment. Our approach uses a hierarchical network architecture with gated encoder blocks and multiscale refinement to preserve fine-grained visual features. Moreover, we incorporate Quantization-Aware Training (QAT) to simulate the effects of low-precision representation during the training process. This allows the network to adapt and prevents the typical drop in quality seen with standard post-training quantization (PTQ). Experimental results demonstrate that the proposed method produces high-fidelity visual output while maintaining the low computational overhead needed for practical use on standard mobile devices. The code will be available at https://github.com/GenAI4E/QATIE.git.

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

1 major / 0 minor

Summary. The paper proposes a hierarchical image enhancement network for mobile devices that incorporates gated encoder blocks and multi-scale refinement, trained via Quantization-Aware Training (QAT) to close the gap between high-precision training and low-precision deployment. It claims this design preserves fine-grained features, avoids the typical quality drop associated with post-training quantization, and delivers high-fidelity outputs at low computational cost suitable for standard mobile hardware, as supported by experimental results.

Significance. If the experimental claims are substantiated, the work would address a practically important problem in on-device computer vision: enabling accurate image enhancement under the quantization constraints of mobile inference without requiring post-hoc fixes. The combination of architecture choices and QAT could provide a template for other enhancement or restoration tasks where detail preservation under low bit-width is critical.

major comments (1)
  1. Abstract: The central claim that 'Experimental results demonstrate that the proposed method produces high-fidelity visual output while maintaining the low computational overhead' and that the gated blocks plus multi-scale refinement 'prevent the typical drop in quality' is unsupported by any quantitative evidence. No PSNR/SSIM values, baseline comparisons, ablation results removing the gated or multi-scale components, bit-width used for QAT, or latency/memory numbers on target mobile hardware are supplied. This absence is load-bearing because the paper's contribution rests entirely on the empirical demonstration that the architecture-specific design enables QAT to succeed where standard approaches fail.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive feedback and for recognizing the practical importance of addressing the training-deployment gap in mobile image enhancement. We address the single major comment below.

read point-by-point responses

  1. Referee: Abstract: The central claim that 'Experimental results demonstrate that the proposed method produces high-fidelity visual output while maintaining the low computational overhead' and that the gated blocks plus multi-scale refinement 'prevent the typical drop in quality' is unsupported by any quantitative evidence. No PSNR/SSIM values, baseline comparisons, ablation results removing the gated or multi-scale components, bit-width used for QAT, or latency/memory numbers on target mobile hardware are supplied. This absence is load-bearing because the paper's contribution rests entirely on the empirical demonstration that the architecture-specific design enables QAT to succeed where standard approaches fail.

    Authors: We agree that the abstract, in its current form, does not contain the specific quantitative evidence needed to make the claims immediately verifiable from the abstract alone. The full manuscript (Sections 3 and 4) does contain the requested details: PSNR/SSIM tables with baseline comparisons, ablation studies isolating the gated encoder blocks and multi-scale refinement modules, the 8-bit QAT configuration, and mobile-device latency/memory measurements. To resolve the referee's concern, we will revise the abstract to include concise numerical highlights drawn directly from those experimental results. This change will strengthen the abstract without altering any findings or interpretations in the body of the paper. revision: yes

Circularity Check

0 steps flagged

No circularity: purely empirical claims with no derivation chain or self-referential reductions

full rationale

The paper proposes a hierarchical architecture with gated encoder blocks, multi-scale refinement, and QAT for mobile image enhancement. All load-bearing assertions rest on experimental results rather than any mathematical derivation, fitted parameters renamed as predictions, or self-citation chains. No equations appear in the provided text, and the central claim (high-fidelity output with low overhead) is presented as an empirical outcome independent of the method description itself. This is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the domain assumption that gated blocks and multi-scale refinement preserve the features needed for QAT to succeed; no free parameters, invented entities, or additional axioms are introduced beyond standard deep-learning practice.

axioms (1)
  • domain assumption Gated encoder blocks and multi-scale refinement preserve fine-grained visual features better than standard convolutional blocks under quantization.
    Invoked to justify why the architecture should mitigate the training-deployment gap.

pith-pipeline@v0.9.0 · 5498 in / 1217 out tokens · 36400 ms · 2026-05-09T22:02:26.116349+00:00 · methodology

discussion (0)

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Reference graph

Works this paper leans on

36 extracted references · 36 canonical work pages · 1 internal anchor

  1. [1]

    Estimating or Propagating Gradients Through Stochastic Neurons for Conditional Computation

    Yoshua Bengio, Nicholas L ´eonard, and Aaron Courville. Estimating or propagating gradients through stochastic neurons for conditional computation.arXiv preprint arXiv:1308.3432, 2013. 2

    work page internal anchor Pith review arXiv 2013

  2. [2]

    Es- timating or propagating gradients through stochastic neurons for conditional computation, 2013

    Yoshua Bengio, Nicholas L ´eonard, and Aaron Courville. Es- timating or propagating gradients through stochastic neurons for conditional computation, 2013. 5

    work page 2013

  3. [3]

    Unprocessing im- ages for learned raw denoising

    Tim Brooks, Ben Mildenhall, Tianfan Xue, Jiawen Chen, Dillon Sharlet, and Jonathan T Barron. Unprocessing im- ages for learned raw denoising. InCVPR, 2019. 2

    work page 2019

  4. [4]

    Learning to see in the dark

    Chen Chen, Qifeng Chen, Jia Xu, and Vladlen Koltun. Learning to see in the dark. InCVPR, 2018. 1, 2

    work page 2018

  5. [5]

    Gopalakrishnan

    Jungwook Choi, Zhuo Wang, Swagath Venkataramani, Pierce I-Jen Chuang, Vijayalakshmi Srinivasan, and K. Gopalakrishnan. Pact: Parameterized clipping activation for quantized neural networks. InICLR, 2018. 2

    work page 2018

  6. [6]

    Learned step size quantization.ICLR, 2020

    Steven Esser, Jeffrey Mckinstry, Deepika Bablani, Rathi- nakumar Appuswamy, and Dharmendra Modha. Learned step size quantization.ICLR, 2020. 2

    work page 2020

  7. [7]

    Zero-reference deep curve estimation for low-light image enhancement

    Chunle Guo, Chongyi Li, Jichang Guo, Chen Change Loy, Junhui Hou, Sam Kwong, and Runmin Cong. Zero-reference deep curve estimation for low-light image enhancement. In CVPR, pages 1777–1786, 2020. 2

    work page 2020

  8. [8]

    Flexisp: A flexible camera image processing frame- work.ACM Transactions on Graphics, 33(6):231:1–231:13,

    Felix Heide, Markus Steinberger, Yun-Ta Tsai, Mushfiqur Rouf, Dawid Pajak, Dikpal Reddy, Orazio Gallo, Jing Liu, Wolfgang Heidrich, Karen Egiazarian, Jan Kautz, and Kari Pulli. Flexisp: A flexible camera image processing frame- work.ACM Transactions on Graphics, 33(6):231:1–231:13,

    work page

  9. [9]

    Distilling the knowledge in a neural network

    Geoffrey Hinton, Oriol Vinyals, and Jeff Dean. Distilling the knowledge in a neural network. 2015. 3

    work page 2015

  10. [10]

    Perception-preserving convolutional networks for image en- hancement on smartphones

    Zheng Hui, Xiumei Wang, Lirui Deng, and Xinbo Gao. Perception-preserving convolutional networks for image en- hancement on smartphones. InProceedings of the European Conference on Computer Vision (ECCV) Workshops, 2018. 2, 6, 7

    work page 2018

  11. [11]

    Dslr-quality photos on mobile devices with deep convolutional networks

    Andrey Ignatov, Nikolay Kobyshev, Radu Timofte, Kenneth Vanhoey, and Luc Van Gool. Dslr-quality photos on mobile devices with deep convolutional networks. InICCV, pages 3277–3285, 2017. 1, 2, 5, 6, 7

    work page 2017

  12. [12]

    Wespe: Weakly supervised photo enhancer for digital cameras

    Andrey Ignatov, Nikolay Kobyshev, Radu Timofte, Kenneth Vanhoey, and Luc Van Gool. Wespe: Weakly supervised photo enhancer for digital cameras. InCVPRW, pages 691– 700, 2018. 2

    work page 2018

  13. [13]

    Ai benchmark: Running deep neural networks on android smartphones

    Andrey Ignatov, Radu Timofte, William Chou, Ke Wang, Max Wu, Tim Hartley, and Luc Van Gool. Ai benchmark: Running deep neural networks on android smartphones. In Proceedings of the European Conference on Computer Vi- sion (ECCV) Workshops, 2018. 5, 8

    work page 2018

  14. [14]

    Pirm chal- lenge on perceptual image enhancement on smartphones: Report

    Andrey Ignatov, Radu Timofte, Thang Van Vu, Tung Minh Luu, Trung X Pham, Cao Van Nguyen, Yongwoo Kim, Jae-Seok Choi, Munchurl Kim, Jie Huang, et al. Pirm chal- lenge on perceptual image enhancement on smartphones: Report. InProceedings of the European Conference on Com- puter Vision (ECCV) Workshops, pages 0–0, 2018. 1

    work page 2018

  15. [15]

    Ai benchmark: All about deep learning on smart- phones in 2019

    Andrey Ignatov, Radu Timofte, Andrei Kulik, Seungsoo Yang, Ke Wang, Felix Baum, Max Wu, Lirong Xu, and Luc Van Gool. Ai benchmark: All about deep learning on smart- phones in 2019. In2019 IEEE/CVF International Confer- ence on Computer Vision Workshop (ICCVW), pages 3617– 3635, 2019. 5, 8

    work page 2019

  16. [16]

    Rgb photo enhance- ment on mobile gpus, mobile ai 2025 challenge: Report

    Andrey Ignatov, Georgy Perevozchikov, Radu Timofte, Wu Pan, Song Wang, Dong Zhang, Zhao Ran, Xiaochen Li, Shichang Ju, Diankai Zhang, Biao Wu, Shaoli Liu, Si Gao, Chengjian Zheng, Ning Wang, Yi Feng, Cailu Wan, Xi- angji Wu, Hailong Yan, Ao Li, Xiangtao Zhang, Zhe Liu, Ce Zhu, Le Zhang, Jinjie Zhou, Yang Lu, Feng Duo, Run- hua Deng, Xuanyu Chen, Shuhui Xi...

    work page 2025

  17. [17]

    Quantization and training of neural networks for efficient integer-arithmetic-only inference

    Benoit Jacob, Skirmantas Kligys, Bo Chen, Menglong Zhu, Matthew Tang, Andrew Howard, Hartwig Adam, and Dmitry Kalenichenko. Quantization and training of neural networks for efficient integer-arithmetic-only inference. InCVPR, pages 2704–2713, 2018. 1, 2

    work page 2018

  18. [18]

    Perceptual losses for real-time style transfer and super-resolution

    Justin Johnson, Alexandre Alahi, and Li Fei-Fei. Perceptual losses for real-time style transfer and super-resolution. In ECCV, 2016. 1

    work page 2016

  19. [19]

    Quantizing deep convolutional networks for efficient inference: A whitepaper

    Raghuraman Krishnamoorthi. Quantizing deep convo- lutional networks for efficient inference: A whitepaper. arXiv:1806.08342, 2018. 1, 2

    work page Pith review arXiv 2018

  20. [20]

    Enhanced deep residual networks for single image super-resolution

    Bee Lim, Sanghyun Son, Heewon Kim, Seungjun Nah, and Kyoung Mu Lee. Enhanced deep residual networks for single image super-resolution. InCVPRW, 2017. 2

    work page 2017

  21. [21]

    2dquant: Low-bit post- training quantization for image super-resolution.Advances in Neural Information Processing Systems, 37:71068–71084,

    Kai Liu, Haotong Qin, Yong Guo, Xin Yuan, Linghe Kong, Guihai Chen, and Yulun Zhang. 2dquant: Low-bit post- training quantization for image super-resolution.Advances in Neural Information Processing Systems, 37:71068–71084,

    work page

  22. [22]

    Data-free quantization through weight equal- ization and bias correction

    Markus Nagel, Mart van Baalen, Tijmen Blankevoort, and Max Welling. Data-free quantization through weight equal- ization and bias correction. InICCV, pages 1325–1334,

    work page

  23. [23]

    Deep multi-scale convolutional neural network for dynamic scene deblurring

    Seungjun Nah, Tae Hyun Kim, and Kyoung Mu Lee. Deep multi-scale convolutional neural network for dynamic scene deblurring. InCVPR, 2017. 2

    work page 2017

  24. [24]

    See, hear, and understand: Benchmarking au- diovisual human speech understanding in multimodal large language models, 2025

    Le Thien Phuc Nguyen, Zhuoran Yu, Samuel Low Yu Hang, Subin An, Jeongik Lee, Yohan Ban, SeungEun Chung, Thanh-Huy Nguyen, JuWan Maeng, Soochahn Lee, and Yong Jae Lee. See, hear, and understand: Benchmarking au- diovisual human speech understanding in multimodal large language models, 2025. 1

    work page 2025

  25. [25]

    Improving generalization in visual reasoning via self-ensemble, 2024

    Tien-Huy Nguyen, Quang-Khai Tran, and Anh-Tuan Quang- Hoang. Improving generalization in visual reasoning via self-ensemble, 2024. 1

    work page 2024

  26. [26]

    Hybrid, unified and itera- tive: A novel framework for text-based person anomaly re- trieval, 2025

    Tien-Huy Nguyen, Huu-Loc Tran, Huu-Phong Phan- Nguyen, and Quang-Vinh Dinh. Hybrid, unified and itera- tive: A novel framework for text-based person anomaly re- trieval, 2025. 1

    work page 2025

  27. [27]

    It- self: Attention guided fine-grained alignment for vision- language retrieval, 2026

    Tien-Huy Nguyen, Huu-Loc Tran, and Thanh Duc Ngo. It- self: Attention guided fine-grained alignment for vision- language retrieval, 2026. 1

    work page 2026

  28. [28]

    Ster-vlm: Spatio-temporal with enhanced reference vision- language models, 2025

    Tinh-Anh Nguyen-Nhu, Triet Dao Hoang Minh, Dat To- Thanh, Phuc Le-Gia, Tuan V o-Lan, and Tien-Huy Nguyen. Ster-vlm: Spatio-temporal with enhanced reference vision- language models, 2025. 1

    work page 2025

  29. [29]

    Le, and Quang-Vinh Dinh

    Huu-Phong Phan-Nguyen, Anh Dao, Tien-Huy Nguyen, Tuan Quang, Huu-Loc Tran, Tinh-Anh Nguyen-Nhu, Huy- Thach Pham, Quan Nguyen, Hoang M. Le, and Quang-Vinh Dinh. Cycle training with semi-supervised domain adapta- tion: Bridging accuracy and efficiency for real-time mobile scene detection, 2025. 2

    work page 2025

  30. [30]

    Bronstein

    Eli Schwartz, Raja Giryes, and Alexander M. Bronstein. Deepisp: Toward learning an end-to-end image processing pipeline.IEEE Transactions on Image Processing, 28(2): 912–923, 2019. 1, 2

    work page 2019

  31. [31]

    Ll-unet++:unet++ based nested skip connec- tions network for low-light image enhancement.IEEE Trans- actions on Computational Imaging, pages 510–521, 2024

    Pengfei Shi, Xiwang Xu, Xinnan Fan, Xudong Yang, and Yuanxue Xin. Ll-unet++:unet++ based nested skip connec- tions network for low-light image enhancement.IEEE Trans- actions on Computational Imaging, pages 510–521, 2024. 3

    work page 2024

  32. [32]

    To- ward accurate post-training quantization for image super- resolution

    Zhijun Tu, Jie Hu, Hanting Chen, and Yunhe Wang. To- ward accurate post-training quantization for image super- resolution. InCVPR, pages 5856–5865, 2023. 2, 3

    work page 2023

  33. [33]

    Describe anything model for visual question answering on text-rich images, 2025

    Yen-Linh Vu, Dinh-Thang Duong, Truong-Binh Duong, Anh-Khoi Nguyen, Thanh-Huy Nguyen, Le Thien Phuc Nguyen, Jianhua Xing, Xingjian Li, Tianyang Wang, Ulas Bagci, and Min Xu. Describe anything model for visual question answering on text-rich images, 2025. 1

    work page 2025

  34. [34]

    Bovik, H.R

    Zhou Wang, A.C. Bovik, H.R. Sheikh, and E.P. Simoncelli. Image quality assessment: from error visibility to structural similarity.IEEE Transactions on Image Processing, 2004. 5

    work page 2004

  35. [35]

    Mobileie: An extremely lightweight and effective convnet for real-time image enhancement on mobile devices

    Hailong Yan, Ao Li, Xiangtao Zhang, Zhe Liu, Zenglin Shi, Ce Zhu, and Le Zhang. Mobileie: An extremely lightweight and effective convnet for real-time image enhancement on mobile devices. InICCV, pages 21949–21960, 2025. 5, 7

    work page 2025

  36. [36]

    Learning enriched features for real image restoration and enhancement

    Syed Waqas Zamir, Aditya Arora, Salman Khan, Munawar Hayat, Fahad Shahbaz Khan, Ming-Hsuan Yang, and Ling Shao. Learning enriched features for real image restoration and enhancement. InECCV, 2020. 2

    work page 2020