OCR Training Data: How to Build Datasets for Handwritten Script Recognition

Printed text OCR is largely solved. Handwritten text OCR — especially in Indic scripts like Devanagari, Tamil, and Telugu — remains a massive challenge. This article covers how to build the annotated datasets that handwritten OCR models need to succeed.

OCR Training Data: How to Build Datasets for Handwritten Script Recognition Printed text OCR is largely solved. Handwritten text OCR — especially in Indic scripts — remains a massive challenge. The State of Handwritten OCR in 2026 While printed document OCR achieves near human accuracy, handwritten text recognition (HTR) — particularly for non Latin scripts — remains a significant unsolved problem due to style variation, ink quality, and script complexity. Why Existing Datasets Fail for Indic Scripts Most publicly available handwriting datasets cover English and Latin script languages. Devanagari, Tamil, Telugu, Kannada, and Bengali scripts have fundamentally different character structures, ligatures, and writing conventions. Collecting Handwriting Samples: Diversity of Styles and Contexts A robust handwriting dataset requires diversity in: writer age, education level, handedness, writing instrument, paper quality, and writing context (notes vs formal writing vs exam answers). Character Level vs Word Level vs Line Level Annotation Character level: Maximum precision but extremely labour intensive. Required for character recognition tasks. Word level: Balanced approach. Good for word spotting and recognition. Line level: Efficient for transcript first approaches using sequence models. Dealing with Illegible Samples and Annotator Disagreement Not all handwritten samples are legible. Annotation guidelines must specify how to handle ambiguous characters, missing strokes, and samples where annotators disagree. Format Standards: COCO JSON, IAM Compatible, Custom Schema We deliver in the format required by your training pipeline — IAM dataset format, COCO JSON, ALTO XML, or custom schema. Case Study: 68% to 94% Devanagari OCR Accuracy with eQOURSE Data A government digitisation project improved Devanagari handwritten document OCR accuracy from 68% to 94% after replacing a generic dataset with eQOURSE collected, style diverse handwriting samples. Build your handwriting OCR dataset with eQOURSE