run2-pdf-calendar-parsing

name	run2_pdf-calendar-parsing
description	Extract calendar events from PDF by mapping colored rectangles to a 15-min grid using PyMuPDF.

PDF Calendar Parsing with PyMuPDF

Installation

pip install pymupdf

Approach

1. Use page.get_drawings() to extract all drawn shapes.
2. Identify the 15-min grid: horizontal lines with width > 100 and height < 3. Sort by y-position. The first line is time 0 (12:00 AM), each subsequent line is +15 min.
3. Identify event blocks: filled rectangles with height > 5 and width > 100.
4. Map each block's top/bottom y to the nearest grid line: slot = round((y - grid[0]) / spacing), time = slot * 15 minutes from midnight.
5. Blue blocks: check if fill[2] > 0.6 and fill[0] < 0.55 (blue-dominant). These are low-priority and overwritable.

Grid line to time mapping

lines = sorted([d["rect"].y0 for d in drawings if d["rect"].width > 100 and d["rect"].height < 3])
spacing = lines[1] - lines[0]  # ~7.5 px

def y_to_slot(y):
    return round((y - lines[0]) / spacing)

def slot_to_time(slot):
    total_min = slot * 15
    h, m = divmod(total_min, 60)
    return h, m  # 24-hour format

Block padding

Blocks have ~1px padding on each side, so round() to nearest slot gives correct results. Always verify by checking that durations are multiples of 15 minutes.

Identifying block colors

• Gray (out of office): fill ≈ (0.38, 0.38, 0.38)
• Red/Pink (meetings): fill ≈ (0.90, 0.49, 0.45)
• Blue (low-priority): fill ≈ (0.47, 0.53, 0.80) — OVERWRITABLE
• Yellow/Green (labels): fill ≈ (0.75, 0.79, 0.20) — these are small label squares inside blocks, ignore