| |
| """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 ".") |
|
|
