File size: 2,334 Bytes
a7c2dd0 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | #!/usr/bin/env python3
"""Build sample_sheet.png: one row per regime, four evenly spaced frames per row.
Usage: python make_sample_sheet.py [dataset_root]
"""
import csv
import sys
from pathlib import Path
import imageio.v2 as imageio
import numpy as np
from PIL import Image, ImageDraw, ImageFont
REGIME_ORDER = ["train", "val_high_damp", "val_low_damp", "val_large_angle",
"val_gravity", "val_quad_damping", "val_driven"]
FRAME_FRACTIONS = (0.0, 0.33, 0.66, 1.0)
PAD, LABEL_W, GAP = 8, 210, 4
def main(root="."):
root = Path(root)
idx = list(csv.DictReader(open(root / "index.csv")))
by_regime = {}
for r in idx:
by_regime.setdefault(r["regime"], []).append(r)
try:
font = ImageFont.truetype("DejaVuSans.ttf", 13)
except Exception:
font = ImageFont.load_default()
rows, size = [], None
for regime in REGIME_ORDER:
rows_ = by_regime.get(regime)
if not rows_:
continue
r = rows_[len(rows_) // 3]
path = root / r["video_path"]
reader = imageio.get_reader(path)
frames = [f for f in reader]
picks = [frames[min(len(frames) - 1, int(f * (len(frames) - 1)))]
for f in FRAME_FRACTIONS]
size = picks[0].shape[0]
rows.append((regime, r, picks))
ncol = len(FRAME_FRACTIONS)
width = LABEL_W + ncol * (size + GAP) + PAD * 2
height = PAD * 2 + len(rows) * (size + GAP + 22)
sheet = Image.new("RGB", (width, height), "white")
draw = ImageDraw.Draw(sheet)
y = PAD
for regime, r, picks in rows:
draw.text((PAD, y), regime, fill="#111", font=font)
draw.text((PAD, y + 34),
f"{r['video_id']} {size}px",
fill="#555", font=font)
draw.text((PAD, y + 54),
f"θ0={float(r['theta0_deg']):+.0f}° γ={float(r['damping_s_inv']):.2f}",
fill="#555", font=font)
for i, frame in enumerate(picks):
x = PAD + LABEL_W + i * (size + GAP)
sheet.paste(Image.fromarray(np.asarray(frame)), (x, y + 22))
y += size + GAP + 22
out = root / "sample_sheet.png"
sheet.save(out)
print(f"wrote {out} ({sheet.size[0]}x{sheet.size[1]})")
if __name__ == "__main__":
main(sys.argv[1] if len(sys.argv) > 1 else ".")
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