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arxiv: 1907.10889 · v1 · pith:WSK6LJG7new · submitted 2019-07-25 · 📡 eess.IV · cs.CV

Performance Evaluation of Two-layer lossless HDR Coding using Histogram Packing Technique under Various Tone-mapping Operators

Hiroyuki Kobayashi , Hitoshi Kiya This is my paper

Pith reviewed 2026-05-24 16:22 UTC · model grok-4.3

classification 📡 eess.IV cs.CV
keywords HDR codinglossless codinghistogram packingtone-mapping operatorJPEG XTtwo-layer codingperformance evaluation
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The pith

Histogram packing in two-layer HDR coding exhibits different performance patterns from JPEG XT across tone-mapping operators.

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

The paper evaluates a proposed lossless two-layer HDR coding approach that relies on histogram packing. Prior results showed it outperforming the JPEG XT standard under a default tone-mapping operator; this work extends the comparison to multiple operators to expose how each coder behaves differently. The evaluation uses test images processed through various tone-mapping functions to measure coding efficiency. A reader would care because tone-mapping is a common preprocessing step in HDR workflows, and understanding coder sensitivity to it affects practical choices in image compression pipelines.

Core claim

The proposed two-layer lossless HDR coding method that incorporates histogram packing was shown to outperform the normative JPEG XT encoder under the default tone-mapping operator in earlier work, but the current comparisons under a range of tone-mapping operators reveal distinct performance characteristics between the two approaches.

What carries the argument

Histogram packing technique inside the two-layer lossless HDR coding structure, used to compare bit-rate efficiency against JPEG XT.

If this is right

  • The relative efficiency of histogram packing versus JPEG XT depends on the specific tone-mapping operator applied to the HDR image.
  • Performance claims for HDR coders require testing across multiple tone-mapping operators rather than a single default.
  • Histogram packing offers compression advantages that appear under some tone-mapping conditions but not uniformly under others.
  • Two-layer HDR coding design choices interact with preprocessing steps in ways that affect final bit rates.

Where Pith is reading between the lines

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

  • Joint optimization of tone-mapping operators together with the choice of coder could improve overall system efficiency in HDR pipelines.
  • Applications that require a fixed tone-mapping operator for display or analysis may benefit from selecting one coder over the other based on these observed patterns.
  • Extending the evaluation to video sequences or additional image categories would test whether the characteristic differences hold beyond still images.

Load-bearing premise

The selected tone-mapping operators and test images are representative enough to reveal general performance characteristics of the two coders.

What would settle it

Running the same comparison on a substantially larger and more diverse set of tone-mapping operators and HDR images and finding no consistent characteristic differences between the coders.

Figures

Figures reproduced from arXiv: 1907.10889 by Hiroyuki Kobayashi, Hitoshi Kiya.

Figure 1
Figure 1. Figure 1: Block diagram of XT coder and HP one images was affected by the selection of TMO, and the default TMO did not give the best quality in various TMOs. B. Comparison of compression performance [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Boxplot of TMQI of proposed method. Box indicates three quartiles of [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Boxplot of bitrates of HP coder and XT coder ( [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
read the original abstract

We proposed a lossless two-layer HDR coding method using a histogram packing technique. The proposed method was demonstrated to outperform the normative JPEG XT encoder, under the use of the default tone-mapping operator. However, the performance under various tone-mapping operators has not been discussed. In this paper, we aim to compare the performance of the proposed method with that of the JPEG XT encoder under the use of various tone-mapping operators to clearly show the characteristic difference between them.

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

2 major / 2 minor

Summary. The manuscript evaluates a two-layer lossless HDR coding method based on histogram packing by comparing its rate-distortion performance to the normative JPEG XT encoder across multiple tone-mapping operators. The central claim is that this comparison under varied TMOs will reveal characteristic differences between the two coders that were not visible under the default TMO alone.

Significance. If the experimental design is strengthened to ensure representativeness, the work could supply practical guidance on coder selection for HDR content processed with different tone-mapping pipelines. The contribution is incremental and empirical; no parameter-free derivations, machine-checked proofs, or reproducible code artifacts are present.

major comments (2)
  1. [Abstract and Section 4 (Experimental Results)] The claim that the experiments 'clearly show the characteristic difference' (abstract) is load-bearing on the diversity of the chosen TMOs and test images. No section justifies the selection, demonstrates coverage of global vs. local operators, or analyzes dynamic-range statistics of the images to rule out sample-specific artifacts.
  2. [Section 4 (Experimental Results)] Performance claims cannot be assessed because the manuscript supplies no information on the number or identity of test images, the exact metrics (bitrate, PSNR, etc.), or any statistical tests for significance of observed differences.
minor comments (2)
  1. [Abstract] The abstract refers to 'the proposed method' without restating its key technical features (histogram packing details) for readers who have not read the prior work.
  2. [Figures and Tables] Figure captions and table headings should explicitly state the TMO used for each row/column to allow direct comparison without cross-referencing the text.

Simulated Author's Rebuttal

2 responses · 0 unresolved

Thank you for the constructive review. We address each major comment below and will revise the manuscript to provide the requested details on experimental design, test data, and metrics.

read point-by-point responses

  1. Referee: [Abstract and Section 4 (Experimental Results)] The claim that the experiments 'clearly show the characteristic difference' (abstract) is load-bearing on the diversity of the chosen TMOs and test images. No section justifies the selection, demonstrates coverage of global vs. local operators, or analyzes dynamic-range statistics of the images to rule out sample-specific artifacts.

    Authors: We agree that the manuscript does not contain an explicit justification for TMO selection or dynamic-range analysis of the images. In revision we will add a dedicated paragraph in Section 4 that (i) lists the specific TMOs employed, (ii) notes which are global and which are local, and (iii) reports basic dynamic-range statistics (e.g., log-luminance range) for the test set to support the claim that the observed coder differences are not image-specific artifacts. revision: yes

  2. Referee: [Section 4 (Experimental Results)] Performance claims cannot be assessed because the manuscript supplies no information on the number or identity of test images, the exact metrics (bitrate, PSNR, etc.), or any statistical tests for significance of observed differences.

    Authors: We acknowledge that the current text omits the number and identities of the test images, the precise definitions of the reported metrics, and any statistical significance tests. The revised Section 4 will explicitly state the size and provenance of the image set, define the metrics (bits per pixel for bitrate and dB for PSNR), and include the results of any significance testing performed on the observed rate-distortion differences. revision: yes

Circularity Check

0 steps flagged

No circularity detected in empirical comparison

full rationale

This paper is a purely empirical performance evaluation of a two-layer HDR coder against the external JPEG XT standard under multiple tone-mapping operators. No derivations, equations, fitted parameters, or predictions are present that could reduce to the paper's own inputs by construction. The central claim rests on new experimental results rather than any self-referential loop, and prior self-citation is limited to motivating the experiment without bearing the load of the current performance claims.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Only the abstract is available; no free parameters, axioms, or invented entities can be identified from the provided text.

pith-pipeline@v0.9.0 · 5598 in / 953 out tokens · 20218 ms · 2026-05-24T16:22:39.718344+00:00 · methodology

discussion (0)

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Reference graph

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