Pipeline:

Step 1: Convert pdf file to image Step 2: Text detection and draw the bounding box Step 3: Merge overlapping, nearby bounding boxes Step 4: Text recognition

Option 1:

Text detection using the Character Region Awareness for Text Detection (CRAFT) algorithm and Text recognition using EasyOCR tool

Option 2:

Text detection using Character Region Awareness for Text Detection (CRAFT) algorithm and Text recognition using Tesseract engine

Option 3:

Text detection using a Differentiable Binarization (DB) algorithm and Text recognition using PaddleOCR tool

Reference:

CRAFT algorithm: Paper: Character Region Awareness for Text Detection Link: https://arxiv.org/pdf/1904.01941.pdf DB algorithm: Paper: Real-Time Scene Text Detection with Differentiable Binarization and Adaptive Scale Fusion: Link: https://arxiv.org/pdf/2202.10304.pdf