research: Add utility scripts

research/.gitignore

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+/data

research/extract-frames.py

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+#!/usr/bin/env python3
+
+import os
+import sys
+import json
+import base64
+
+def save_image(data_url, fn):
+    pref = "data:image/jpeg;base64,"
+    if data_url.startswith(pref):
+        b = base64.b64decode(data_url[len(pref):])
+        ext = 'jpg'
+    pref = "data:image/png;base64,"
+    if data_url.startswith(pref):
+        b = base64.b64decode(data_url[len(pref):])
+        ext = 'png'
+    fn = f'{fn}.{ext}'
+    with open(fn, 'wb') as fd:
+        fd.write(b)
+    return fn
+
+for r, ds, fs in os.walk('raw/camera-frame'):
+    for f in fs:
+        fn = os.path.join(r, f)
+        with open(fn, 'r') as fd:
+            data = json.load(fd)
+            phone_model = data.get('phone_model', 'unknown')
+            session_id = data.get('session_id', 'unknown')
+            seq_num = data.get('seq_num', 'unknown')
+            fn = os.path.join('data/frames', f'{phone_model}-{session_id}-{seq_num}')
+            fn = save_image(data['image_data_url'], fn)
+            print(fn)

research/fetch-all.sh

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+#!/bin/bash
+
+rsync -arP zy:/data/emblem-research/ raw