Foundations
Person ReID: a beginner's guide to person re-identification
Learn how Person ReID turns person crops into appearance embeddings, ranked matches and reviewable results—without confusing retrieval with identity proof.
PolyReID field notes
Photo workflows and Person ReID for production teams
Operational guidance for photography teams and developers—from competition upload and gallery design to versioned appearance vectors and responsible review.
Knowledge base
Guides and field notes
Event photography
AI Face Matching for Events and Photographers: Explore Without a Credit Card
See how AI face matching can help event photographers organize galleries, review photo suggestions and test a complete workflow without entering a credit card.
Event photography
AI Photographer Matching: A Faster Way to Organize Event Photo Galleries
Learn how PolyReID matches people across event photos, helps photographers review groups, launch a kiosk and share a customized store—with no credit card required to test it.
Foundations
Person Identification in Event Photos: Match, Review and Publish with AI
Understand the difference between person identification and AI photo matching, and see how event teams can use face, visual and OCR signals with human review.
Vision & API
CLIP and Semantic Image Search: Find a Scene with Words
Learn how to search photos with a description—from a dancer in a black dress to a nature scene—and build a useful workflow without first training a dedicated classifier.
AI Engineering
Fast OCR in Production: RapidOCR, ONNX Runtime and Bounded Queues
Understand the RapidOCR pipeline built on PP-OCR, measure its speed and deploy it with input limits, bounded concurrency, retries and observability.
Datasets
Build a Person ReID Dataset: Boxes, Identities and Splits
Learn to build an auditable Person ReID dataset with identity labels, correct bounding boxes, variant lineage and leakage-resistant train/test splits.
Research explained
Domain Generalization in Person ReID: BAU Explained
Understand Person ReID domain generalization and how the NeurIPS 2024 BAU method balances alignment, uniformity and augmentation reliability.
Research explained
Occluded and Partial Person ReID: Methods and Limits
Compare part pooling, visibility estimation, pose guidance and feature dropping for occluded and partial Person ReID—and understand their limits.
Foundations
Open-Set Person ReID: Rejection, Unknowns and Evaluation
Learn how open-set Person ReID retrieves candidates, rejects unsupported matches, handles unknown identities and evaluates false accepts with human review.
Datasets
Person ReID Dataset Benchmarks: Protocols, Bias and Limits
Compare Person ReID benchmarks by capture domain, protocol and bias, then learn what a reproducible score can—and cannot—support in a production workflow.
Academic guide
Person ReID Loss Functions: Triplet, ArcFace and ID Loss
Compare identity classification, batch-hard triplet loss, ArcFace and metric-learning objectives for Person ReID, with formulas and trade-offs.
Academic guide
Person ReID Model Architectures: CNNs, Transformers, Parts
Compare CNN, transformer, part-based and hybrid Person ReID model architectures, including pooling choices, trade-offs and evaluation criteria.
Retrieval
Re-ranking for Person ReID: How k-Reciprocal Neighbors Work
Learn how Person ReID k-reciprocal re-ranking uses mutual neighborhoods, weighted Jaccard distance and query expansion, plus its costs and failure modes.
Photography foundations
AI Photo Sorting vs Culling: What Event Teams Need
Understand the difference between photo culling, grouping by person, metadata organization and delivery before choosing an AI photography tool.
Photography workflow
Ballroom Dance Photography Workflow: From Upload to Kiosk and Store
A simple PolyReID workflow for ballroom photographers: upload event photos, match each dancer, review groups, launch a kiosk and share a branded store.
Architecture
Build or buy a Person ReID stack? A decision guide
Compare an internal Person ReID stack with a managed embedding API across domain fit, data, evaluation, operations, cost and governance.
Software selection
Event Photo Sorting Software: A Practical Buyer’s Guide
Evaluate event photo sorting software by workflow coverage, review controls, data portability, reliability and total operating cost.
Event photography
Face search vs Person ReID for event photos
Compare selfie-based face search with full-body Person ReID for ballroom and action photos, where pose, occlusion and turned faces change the useful signal.
Privacy and compliance
GDPR and Person ReID for event photos: a practical checklist
Assess Person ReID in event photography under GDPR: personal and biometric data, purpose, lawful basis, DPIA, retention, access and participant rights.
Evaluation
How to choose a Person ReID similarity threshold
Calibrate a Person ReID similarity threshold from representative positive and negative pairs, product costs, review bands and untouched test data.
Dance photography
How to organize a dance competition photo gallery
Design a dance competition gallery around dancers, couples and review states so customers can find relevant action photos without browsing one giant timeline.
Photography workflow
How to Organize Event Photos by Bib Number
Build a reviewable bib-number workflow using OCR, roster validation, event context and human correction without treating a number as identity proof.
Photography business
How to sell dance competition photos online
Plan an online dance-photo sales workflow with findable galleries, clear products, controlled previews and reliable fulfilment—without overpromising automation.
Operations
Human review for AI photo matching: an event workflow
Turn ranked AI photo matches into a focused review queue with clear accept, reject, merge and split actions for difficult ballroom and action images.
API documentation
Integrating a Person ReID API: crops, embeddings and vector search
Learn how to integrate a Person ReID embedding API with versioned crops, vector storage, safe retries, retrieval and human review.
Photography workflow
Live Event Photo Upload Workflow: Ingest to Publish
Design a resilient live event photo upload workflow with file verification, idempotent queues, visible states, human review and controlled publication.
Engineering
Person crop quality for ReID: an input checklist
Prepare reliable Person ReID crops by controlling subject count, framing, blur, occlusion, truncation, resizing and quality-gate decisions.
MLOps
Person ReID domain shift: detection and response playbook
Detect Person ReID domain shift across cameras, venues, crops and populations, then reevaluate, recalibrate or adapt without hiding regressions.
Evaluation
Person ReID evaluation metrics: Rank-k, mAP and production tests
Learn how to evaluate Person ReID with a sound query-gallery protocol, Rank-k, mAP, threshold metrics, quality slices and reviewer workload.
Foundations
Person ReID vs face recognition vs tracking: what is the difference?
Compare Person ReID, face recognition and video tracking by input, output, failure mode, evaluation method and privacy impact.
Engineering
ReID embeddings and vector databases
Store, index and query normalized person-appearance embeddings without losing model compatibility, privacy boundaries or review context.
Case study
Ballroom Person ReID: what our internal evaluation does—and does not—show
A sourced account of PolyReID’s ballroom training setup, model design, workflow boundaries and known failure modes without universal accuracy claims.