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arxiv: 2604.22515 · v2 · submitted 2026-04-24 · 💻 cs.CV · cs.LG

Recognition: unknown

Different Strokes for Different Folks: Writer Identification for Historical Arabic Manuscripts

Ariel Justine N. Panopio, Hamza A. Abushahla, Layth Al-Khairulla, Mohamed I. AlHajri

Pith reviewed 2026-05-08 12:28 UTC · model grok-4.3

classification 💻 cs.CV cs.LG
keywords writer identificationhistorical Arabic manuscriptsMuharaf datasetconvolutional neural networksattention mechanismspage-disjoint protocolhandwriting analysiscultural heritage documents
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The pith

Fine-tuned DenseNet201 with attention reaches 99.05% top-1 accuracy identifying writers from individual lines in historical Arabic manuscripts.

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

The paper manually verifies and expands writer labels in the Muharaf dataset from 6,858 to 21,249 lines, retaining 18,987 after filtering. It trains and benchmarks convolutional neural network models that incorporate attention mechanisms to perform closed-set writer identification from line images, including lines written by two people treated as composite classes. Under random splits of individual lines the best model records 99.05% top-1 accuracy, 99.73% top-5 accuracy and 97.44% F1-score. When entire pages are kept disjoint between training and test sets the same architecture drops to 78.61% top-1 accuracy, showing how much performance depends on page-level cues rather than handwriting style alone. The expanded labels and dual-protocol baselines supply historians and linguists with a concrete resource for provenance and authenticity work on culturally significant documents.

Core claim

By expanding the labeled subset of the Muharaf dataset of historical Arabic manuscripts and training a CNN with attention, the authors establish the first reported baselines for closed-set writer identification under both line-level and page-disjoint protocols. A fine-tuned DenseNet201 model with attention achieves 99.05% Top-1 accuracy, 99.73% Top-5 accuracy and 97.44% F1-score when lines are split randomly. The same model records 78.61% Top-1, 87.79% Top-5 and 66.55% F1-score under the stricter page-disjoint protocol, thereby quantifying the contribution of page context.

What carries the argument

A convolutional neural network with attention layers, using DenseNet201 as the feature extractor and trained on line images for closed-set classification by writer identity, with fourteen configurations and ablations across feature extractors and training regimes.

If this is right

  • Historians obtain a practical method for attributing authorship in unsigned Arabic manuscripts once the model is applied to new line images.
  • The performance gap between protocols directly measures how much page layout and context contribute to identification accuracy.
  • Lines written by two different hands can be handled by treating each writer pair as a distinct composite class.
  • The corrected and expanded labeled subset of 18,987 lines becomes a reusable training resource for further digital-heritage work.
  • Benchmark numbers under both protocols serve as a reference point for comparing future writer-identification techniques.

Where Pith is reading between the lines

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

  • The same labeling-plus-attention pipeline could be repeated on manuscripts in other scripts to create comparable public datasets.
  • Future models might improve by explicitly disentangling handwriting strokes from page layout features to close the page-disjoint gap.
  • Automated consistency checks on writer labels could lower the cost of scaling the approach to much larger manuscript collections.

Load-bearing premise

The manually verified and expanded writer labels from the original partial annotations contain no systematic inconsistencies that affect model training or evaluation.

What would settle it

A second independent manual review of a random subset of the expanded line labels, followed by retraining the DenseNet201 model and measuring any drop in the reported top-1 and F1-score figures.

read the original abstract

Handwritten Arabic manuscripts preserve the Arab world's intellectual and cultural heritage, and writer identification supports provenance, authenticity verification, and historical analysis. Using the Muharaf dataset of historical Arabic manuscripts, we evaluate writer identification from individual line images and, to the best of our knowledge, provide the first baselines reported under both line-level and page-disjoint evaluation protocols. Since the dataset is only partially labeled for writer identification, we manually verified and expanded writer labels in the public portion from 6,858 (28.00%) to 21,249 lines (86.75%) out of 24,495 line images, correcting inconsistencies and removing non-handwritten text. After further filtering, we retained 18,987 lines (77.51%). We propose a Convolutional Neural Network (CNN)-based model with attention mechanisms for closed-set writer identification, including rare two-writer lines modeled as composite writer-pair classes. We benchmark fourteen configurations and conduct ablations across different feature extractors and training regimes. To assess generalization to unseen pages, the page-disjoint protocol assigns all lines from each page to a single split. Under the line-level protocol, a fine-tuned DenseNet201 with attention achieves 99.05% Top-1 accuracy, 99.73% Top-5 accuracy, and 97.44% F1-score. Under the more challenging page-disjoint protocol, the best observed results are 78.61% Top-1 accuracy, 87.79% Top-5 accuracy, and 66.55% F1-score, thus quantifying the impact of page-level cues. By expanding the Muharaf dataset's labeled subset and reporting both protocols, we provide a clearer benchmark and a practical resource for historians and linguists engaged with culturally and historically significant documents. The code and implementation details are available on GitHub.

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 / 2 minor

Summary. The paper expands the labeled subset of the Muharaf dataset of historical Arabic manuscripts by manually verifying and correcting writer labels, increasing coverage from 6,858 to 21,249 lines (retaining 18,987 after filtering). It introduces a CNN architecture with attention for closed-set writer identification (treating rare two-writer lines as composite classes), benchmarks 14 configurations across feature extractors under both line-level and page-disjoint protocols, and reports peak results of 99.05% Top-1 / 99.73% Top-5 accuracy (line-level) and 78.61% Top-1 / 87.79% Top-5 accuracy (page-disjoint) with a fine-tuned DenseNet201+attention model. Code is released on GitHub.

Significance. If the expanded labels prove reliable, the work supplies the first reported baselines for writer identification on this culturally significant dataset under two protocols that explicitly quantify page-level cue leakage. The ablations across multiple extractors, the dual-protocol design, and the public code release are concrete strengths that enable reproducibility and support downstream use by historians and digital-humanities researchers.

major comments (1)
  1. [Dataset preparation] Dataset preparation section (description of label expansion and filtering): The manual verification process that expands writer labels from 6,858 to 21,249 lines (and retains 18,987 after filtering) is presented without reporting the number of annotators, inter-annotator agreement, sampling strategy for verification, or concrete examples of corrected inconsistencies. This is load-bearing for the central empirical claims because the headline accuracies (99.05% Top-1 line-level; 78.61% Top-1 page-disjoint) are only interpretable if the labels are free of systematic noise; historical Arabic hands are known to be visually confusable, so any unquantified labeling error would directly bias both evaluation protocols.
minor comments (2)
  1. [Abstract / Results] Abstract and results tables: The exact breakdown of the 5,262 lines removed during filtering (non-handwritten text, inconsistencies, etc.) is not tabulated; adding a small supplementary table would improve transparency without altering the narrative.
  2. [Methodology] Methodology: The attention mechanism is described at a high level; a brief diagram or equation showing how the attention weights are computed and fused with the DenseNet features would aid reproducibility.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the positive assessment of our work's significance and for the constructive feedback on dataset preparation. We address the major comment below and commit to revisions that strengthen the manuscript without altering its core claims.

read point-by-point responses
  1. Referee: [Dataset preparation] Dataset preparation section (description of label expansion and filtering): The manual verification process that expands writer labels from 6,858 to 21,249 lines (and retains 18,987 after filtering) is presented without reporting the number of annotators, inter-annotator agreement, sampling strategy for verification, or concrete examples of corrected inconsistencies. This is load-bearing for the central empirical claims because the headline accuracies (99.05% Top-1 line-level; 78.61% Top-1 page-disjoint) are only interpretable if the labels are free of systematic noise; historical Arabic hands are known to be visually confusable, so any unquantified labeling error would directly bias both evaluation protocols.

    Authors: We agree that additional transparency on the label verification process is warranted to support interpretability of the results. In the revised manuscript we will expand the Dataset preparation section with the following: the verification and correction of existing labels was performed manually by the authors (who have relevant expertise in historical Arabic manuscripts); the process was exhaustive rather than sampled (all lines in the public portion were reviewed to expand coverage, correct writer attributions, and remove non-handwritten elements); and we will include 2-3 concrete examples of corrected inconsistencies (e.g., swapped writer IDs arising from visually similar hands). We did not compute formal inter-annotator agreement because the task was verification/correction of pre-existing labels rather than independent multi-annotator annotation; we will explicitly note this as a limitation. These changes will directly address the referee's concern while preserving the reported experimental outcomes. revision: yes

Circularity Check

0 steps flagged

No circularity: purely empirical benchmark on held-out splits

full rationale

The paper reports standard CNN training and evaluation results (DenseNet201 with attention, etc.) on manually expanded Muharaf labels under line-level and page-disjoint protocols. No equations, derivations, or first-principles claims exist that reduce reported accuracies to fitted parameters or self-defined quantities within the paper. Label expansion is described as a manual verification step with no self-referential fitting or prediction loop. The central results are direct empirical measurements on data splits, with no load-bearing self-citations or ansatz smuggling. This is a self-contained benchmark paper.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The central performance claims rest on the correctness of the manually expanded writer labels and on the assumption that line images are sufficiently independent once page-disjoint splits are enforced. No new physical or mathematical entities are introduced.

pith-pipeline@v0.9.0 · 5659 in / 1300 out tokens · 28302 ms · 2026-05-08T12:28:59.955534+00:00 · methodology

discussion (0)

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Reference graph

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