# ecgdig dataset Recover 12-lead ECG voltage time series from images of printed ECG pages. ## Layout ``` train.csv one row per training record: id, fs, sig_len train//.csv ground-truth signal table for that record train//-v*.{png,jpg} nine images of the same printed record test.csv one row per test record and lead: id, lead, fs, number_of_rows test/.jpg ONE image per test record (condition varies) sample_submission.csv valid all-zeros submission (the format contract) ``` ## Records A record is one 12-lead ECG acquisition, 10 seconds long, sampled at `fs` Hz (`fs` is one of 250, 256, 500, 512, 1000, 1025; `sig_len = fs * 10`). Each printed page uses the standard 3x4 layout plus a lead II rhythm strip at 25 mm/s and 10 mm/mV: lead II is visible for the full 10 s; every other lead is visible for one 2.5 s column (I, II, III during 0 to 2.5 s, aVR, aVL, aVF during 2.5 to 5 s, V1, V2, V3 during 5 to 7.5 s, V4, V5, V6 during 7.5 to 10 s). ## Signal tables (train//.csv) `sig_len` rows, twelve columns I, II, III, aVR, aVL, aVF, V1..V6, values in millivolts. Each lead holds numbers only inside its visible window and NaN outside it; lead II is fully populated. The visible windows are what a submission must reconstruct for test records. ## Image conditions Every training record carries nine images of the same printed page: - `v1` clean digital render of the page (PNG) - `v2` color print, scanned in color (JPEG) - `v3` color print, scanned in black and white (PNG) - `v4` phone photo of the printed page (JPEG) - `v5` phone photo of the page shown on a laptop screen (JPEG) - `v6` phone photo of a stained and soaked printout (JPEG) - `v7` phone photo of a heavily damaged printout (JPEG) - `v8` color scan of a mold-degraded printout (JPEG) - `v9` black and white scan of a mold-degraded printout (JPEG) Each test record provides exactly ONE image (JPEG), drawn from these same conditions; the condition is not labeled. The pages carry printed header furniture (an id string, age, sex, a date, sometimes a QR code); it is page decoration, and the rules forbid using it to try to identify source recordings. ## Submission format CSV with header `id,value`; `id = {record}_{row}_{lead}` covering, for every test record, `fs * 10` rows for lead II and `floor(fs * 2.5)` rows for each other lead (`number_of_rows` in test.csv is authoritative). `value` is the predicted voltage in mV at that sample. Every expected id exactly once; finite values only.