Inkjet CDM — Thesis Figure Index

All figures are in: results/figures/ Generated by: scripts/plot_inkjet_results.py

Figure 1 — λ Ablation Curve

File: results/figures/fig1_inkjet_lambda_ablation.png

Caption (thesis):

Separation loss weight ablation on the inkjet QC dataset. AUROC is reported across four values of λ (K=100 Monte Carlo trials). All values in the optimal zone [0.01–0.05] consistently outperform the baseline (λ=0, AUROC=0.833), confirming that the optimal zone identified on CIFAR-10 transfers directly to the industrial inkjet domain without domain-specific tuning.

Where to use: Chapter 5 (Inkjet Application), Section "Ablation: Separation Loss Weight"

Figure 2 — Per-Feature AUROC Bar Chart

File: results/figures/fig2_per_feature_auroc.png

Caption (thesis):

Per-feature AUROC comparison of the CDM baseline (λ=0) and the proposed model (λ=0.01). Green Δ labels indicate improvements of ≥0.02 AUROC. The largest gains occur on edge3 (+0.156) and edge4 (+0.069), both high-frequency texture features sensitive to printing artefacts.

Where to use: Chapter 5, Section "Per-Feature Analysis"

Figure 3 — FPR@95TPR Bar Chart

File: results/figures/fig3_fpr_comparison.png

Caption (thesis):

Per-feature FPR at 95% TPR for the baseline and proposed model. Lower is better. The separation loss reduces false positive rates on dots (−15.4pp), edge3 (−12.5pp), edge4 (−12.5pp), and edge2 (−11.1pp), while slightly increasing FPR on dist1 — a feature that is already near-perfect at baseline (AUROC=0.90) and does not benefit from additional separation signal.

Where to use: Chapter 5, Section "Per-Feature Analysis" or "Operational Impact"

Figure 4 — Overall ROC Curves

File: results/figures/fig4_roc_curves.png

Caption (thesis):

ROC curves for the CDM baseline (λ=0, AUROC=0.833) and the proposed model (λ=0.01, AUROC=0.860) on the inkjet test set (N=266, K=100 MC trials). The dotted horizontal line marks TPR=0.95, the operating point for computing FPR@95TPR. The proposed model's curve lies consistently above the baseline, indicating improved detection across all thresholds.

Where to use: Chapter 5, Section "Overall Results" — typically alongside or below the main results table.

Figure 5 — Score Distributions (GOOD vs BAD)

File: results/figures/fig5_score_distributions.png

Caption (thesis):

OOD score distributions for GOOD (blue) and BAD (orange) samples. Left: baseline (λ=0). Right: proposed (λ=0.01). Score > 0 indicates predicted BAD. Both distributions are tightly clustered near zero due to the small inkjet dataset and the per-crop image representation. The separation loss shifts the BAD distribution slightly rightward and reduces overlap with the GOOD distribution, consistent with the AUROC improvement.

Where to use: Chapter 5 appendix or as supporting evidence for the score-based classification mechanism.

CIFAR-10 Figure (Chapter 4 Reference)

File: /system/user/studentwork/mohammed/2025/diffusion_classifier_ood/results/figures/separation_loss_ablation_final.png

Caption (thesis):

Separation loss weight ablation study on CIFAR-10 (binary: airplane vs. all other classes). AUROC peaks at λ=0.02 (0.9911), establishing the optimal zone λ∈[0.01, 0.05]. This figure is the primary ablation result for Chapter 4; the inkjet ablation (Figure X above) confirms cross-domain generalisability of the optimal zone.

Where to use: Chapter 4 (CIFAR-10 Experiments), Section "Separation Loss Ablation"

Figure Generation

To regenerate all inkjet figures from scratch:

cd /system/user/studentwork/mohammed/2025/inkjet_qc/thesis_cdm_final
conda activate /system/apps/studentenv/mohammed/sdm/
python scripts/plot_inkjet_results.py

To update a single figure, edit scripts/plot_inkjet_results.py and call the relevant function.