time-dilation/camera.html at main · lordbasilaiassistant-sudo/time-dilation · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<title>Cosmic Ray Camera — your phone as a particle detector</title>
<style>
  :root {
    --bg: #07080c;
    --panel: #0f1118;
    --ink: #e6e8ef;
    --dim: #7b8190;
    --accent: #7cf9ff;
    --warm: #ffb86b;
    --hot: #ff5c7a;
    --ok: #4cd980;
  }
  * { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
  html, body {
    margin: 0; padding: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
    min-height: 100vh;
  }
  .wrap { max-width: 600px; margin: 0 auto; padding: 18px 16px 40px; }
  h1 { margin: 0 0 4px; font-size: 20px; font-weight: 500; }
  h1 .sub { color: var(--dim); font-weight: 400; font-size: 12px; display: block; margin-top: 2px; }
  .intro { color: var(--dim); font-size: 12px; line-height: 1.6; margin: 14px 0 18px; }
  .intro a { color: var(--accent); text-decoration: none; }

  .phase-card {
    border: 1px solid #2a2e3c;
    border-radius: 10px;
    padding: 18px;
    background: #0a0c12;
    margin: 14px 0;
  }
  .phase-card.active { border-color: var(--accent); box-shadow: 0 0 24px rgba(124,249,255,0.12); }
  .phase-card .stage {
    font-size: 10px; color: var(--dim);
    text-transform: uppercase; letter-spacing: 1.4px;
  }
  .phase-card h2 { margin: 4px 0 8px; font-size: 16px; font-weight: 500; }
  .phase-card p { margin: 0 0 12px; font-size: 13px; color: var(--dim); line-height: 1.5; }

  button {
    background: var(--accent);
    color: #001318;
    border: 0;
    padding: 14px 18px;
    border-radius: 8px;
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: 0.15s;
  }
  button:disabled { opacity: 0.3; cursor: not-allowed; }
  button:active { transform: scale(0.98); }
  button.secondary {
    background: transparent;
    border: 1px solid #2a2e3c;
    color: var(--ink);
  }

  .progress {
    height: 4px;
    background: #1a1d28;
    border-radius: 2px;
    overflow: hidden;
    margin: 10px 0;
  }
  .progress .bar {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.3s ease-out;
  }

  .stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 10px 0;
  }
  .stat {
    background: var(--panel);
    border: 1px solid #2a2e3c;
    border-radius: 8px;
    padding: 12px;
  }
  .stat .lbl { font-size: 10px; color: var(--dim); text-transform: uppercase; letter-spacing: 1.2px; }
  .stat .val { font-size: 22px; margin-top: 4px; font-variant-numeric: tabular-nums; }
  .stat.events .val { color: var(--accent); }
  .stat.rate .val { color: var(--warm); }
  .stat.runtime .val { color: var(--ink); font-size: 18px; }
  .stat.fps .val { color: var(--dim); font-size: 14px; }

  .events-feed {
    background: var(--panel);
    border: 1px solid #2a2e3c;
    border-radius: 8px;
    padding: 12px;
    margin: 12px 0;
    max-height: 200px;
    overflow-y: auto;
    font-size: 11px;
    line-height: 1.7;
  }
  .events-feed .ev {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    border-bottom: 1px solid #1c1f2a;
  }
  .events-feed .ev:last-child { border-bottom: 0; }
  .events-feed .ev .ev-t { color: var(--dim); }
  .events-feed .ev .ev-b { color: var(--accent); }
  .events-feed .empty { color: var(--dim); text-align: center; padding: 14px 0; }

  .preview-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 10px 0;
    align-items: start;
  }
  .preview {
    background: #000;
    border: 1px solid #2a2e3c;
    border-radius: 8px;
    aspect-ratio: 1/1;
    position: relative;
    overflow: hidden;
  }
  .preview canvas {
    width: 100%; height: 100%;
    display: block;
    image-rendering: pixelated;
  }
  .preview .label {
    position: absolute; top: 6px; left: 8px;
    font-size: 9px;
    color: var(--dim);
    background: rgba(0,0,0,0.7);
    padding: 2px 6px;
    border-radius: 3px;
    letter-spacing: 1px;
    text-transform: uppercase;
  }

  details {
    border: 1px solid #2a2e3c;
    border-radius: 8px;
    background: var(--panel);
    margin: 14px 0;
    padding: 12px 14px;
    font-size: 12px;
    color: var(--dim);
  }
  details summary { cursor: pointer; color: var(--ink); font-weight: 500; }
  details p { margin: 10px 0 0; line-height: 1.6; }
  details code {
    background: #0a0c12; color: var(--accent);
    padding: 1px 4px; border-radius: 3px;
  }

  .hidden { display: none !important; }

  .nav {
    text-align: center;
    font-size: 11px;
    color: var(--dim);
    margin: 24px 0 0;
    line-height: 2;
  }
  .nav a { color: var(--accent); text-decoration: none; }

  video { display: none; }
</style>
</head>
<body>
<div class="wrap">
  <h1>Cosmic Ray Camera
    <span class="sub">your phone, in a browser tab, as a particle detector</span>
  </h1>

  <div class="intro">
    Cover your phone's rear camera lens with black tape (or just face it down
    against a dark surface) and the page will read every frame looking for the
    bright flashes that happen when a high-energy cosmic muon hits the CMOS
    sensor's silicon. Same physics as a cloud chamber. Hardware you already own.
    Pure browser — no install. Real research apps (CRAYFIS, DECO) do this with
    native code; this is the same idea in JavaScript. <a href="index.html">← sim</a>
  </div>

  <!-- Phase 1: setup -->
  <div class="phase-card" id="phase1">
    <div class="stage">step 1</div>
    <h2>Cover your camera completely</h2>
    <p>Black electrical tape over the rear lens is ideal. A pinhole of light will
    completely swamp the cosmic-ray signal. If you don't have tape, place the
    phone lens-down on a black T-shirt with no edge gaps. Then tap below.</p>
    <button id="start">Start camera</button>
    <div id="err" style="color: var(--hot); font-size: 12px; margin-top: 10px;"></div>
  </div>

  <!-- Phase 2: calibration -->
  <div class="phase-card hidden" id="phase2">
    <div class="stage">step 2 — calibration</div>
    <h2>Learning your sensor's noise floor</h2>
    <p>Building a per-pixel baseline so we can distinguish a real cosmic-ray
    event from ordinary thermal noise. Don't move the phone during this. Takes
    ~30 seconds.</p>
    <div class="progress"><div class="bar" id="calibBar"></div></div>
    <div style="font-size: 11px; color: var(--dim); text-align: center" id="calibStatus">collecting frames…</div>
  </div>

  <!-- Phase 3: detecting -->
  <div class="phase-card hidden" id="phase3">
    <div class="stage">step 3 — detecting</div>
    <h2>Cosmic-ray watch is live</h2>

    <div class="stats">
      <div class="stat events">
        <div class="lbl">Events detected</div>
        <div class="val" id="nEvents">0</div>
      </div>
      <div class="stat rate">
        <div class="lbl">Rate (events / hour)</div>
        <div class="val" id="rate">—</div>
      </div>
      <div class="stat runtime">
        <div class="lbl">Run time</div>
        <div class="val" id="runtime">0 s</div>
      </div>
      <div class="stat fps">
        <div class="lbl">Frames processed</div>
        <div class="val" id="frames">0</div>
      </div>
    </div>

    <div class="preview-row">
      <div class="preview"><div class="label">live</div><canvas id="liveCanvas" width="160" height="160"></canvas></div>
      <div class="preview"><div class="label">last event</div><canvas id="eventCanvas" width="160" height="160"></canvas></div>
    </div>

    <div class="events-feed" id="feed"><div class="empty">No events yet — events look like sudden bright pixel clusters lasting one frame. At sea level expect a few per hour on a typical phone.</div></div>

    <button id="stop" class="secondary">Stop detection</button>
  </div>

  <details>
    <summary>How this is a time-dilation experiment</summary>
    <p>Cosmic muons are born ~15 km above your head when high-energy protons
    hit the atmosphere. Their proper lifetime is <code>2.197 µs</code> (PDG 2024).
    At v ≈ 0.998c they'd travel only 660 m before decay — almost none would
    reach the ground.</p>
    <p>They do reach the ground (about 1 cm⁻²·min⁻¹ at sea level) because in
    Earth's frame their lifetime stretches by γ ≈ 40, giving them ~25 km of
    travel. Each event you record is a particle that's only here because of
    real, measurable time dilation.</p>
  </details>

  <details>
    <summary>Honest caveats</summary>
    <p><b>What this is:</b> a pure-web proof of concept of the CRAYFIS /
    DECO smartphone cosmic-ray detection technique. It looks for outlier
    bright pixels in the rear-camera feed and ranks them by sigma above the
    per-pixel calibrated noise floor.</p>
    <p><b>What this is not:</b> research-grade calibration. Real CRAYFIS uses
    native YUV camera access, dark-frame thermal correction, and large-N
    statistics across many phones. Your single detector will see some real
    cosmic events mixed with light leaks, hot pixels (we mask the obvious
    ones), and CMOS bit errors. Expect rate ~1–20 events/hour if your tape
    seal is good; much higher means light leak.</p>
    <p><b>The rate-of-truth check:</b> CRAYFIS reported median rate ~3
    events/hour per phone. If yours is in that ballpark with the camera
    covered, you're seeing real physics.</p>
  </details>

  <div class="nav">
    <a href="index.html">two-observer sim</a> ·
    <a href="tracker.html">personal GPS tracker</a> ·
    <a href="experiments/cloud-chamber/">cloud chamber</a> ·
    <a href="https://github.com/lordbasilaiassistant-sudo/time-dilation">github</a>
  </div>
</div>

<video id="video" autoplay playsinline muted></video>

<script>
(() => {
  // --- config ---
  const W = 160, H = 160;              // downsample resolution (perf vs sensitivity tradeoff)
  const TARGET_FPS = 10;               // process frames per second
  const CALIB_FRAMES = 200;            // ~20 seconds at 10 fps
  const SIGMA_THRESHOLD = 6.0;         // bright-pixel threshold above per-pixel noise
  const ABS_FLOOR = 30;                // absolute pixel floor (0-255) to avoid noise traps
  const MIN_CLUSTER = 2;               // require at least N adjacent bright pixels
  const HOT_PIXEL_RATE = 0.005;        // mask pixels firing > 0.5% of frames
  const HOT_PIXEL_GRACE = 50;          // wait this many frames before applying hot-pixel mask

  // --- state ---
  const N = W * H;
  const pxMean = new Float32Array(N);
  const pxM2 = new Float32Array(N);     // Welford's sum of squared deltas
  const pxFires = new Uint32Array(N);   // hot-pixel counter
  let calibFrames = 0;
  let detectFrames = 0;
  let totalEvents = 0;
  let runStart = 0;
  let stream = null;
  let video, liveCv, liveCtx, eventCv, eventCtx, hiddenCv, hiddenCtx;
  let rafId = null;
  let lastFrameTs = 0;

  // --- DOM ---
  const $ = id => document.getElementById(id);
  const els = {
    start: $('start'), stop: $('stop'),
    err: $('err'),
    phase1: $('phase1'), phase2: $('phase2'), phase3: $('phase3'),
    calibBar: $('calibBar'), calibStatus: $('calibStatus'),
    nEvents: $('nEvents'), rate: $('rate'),
    runtime: $('runtime'), frames: $('frames'),
    feed: $('feed'),
  };

  // --- video setup ---
  async function startCamera() {
    try {
      stream = await navigator.mediaDevices.getUserMedia({
        video: {
          facingMode: { ideal: 'environment' },
          width: { ideal: 640 },
          height: { ideal: 640 },
          frameRate: { ideal: 30 },
        },
        audio: false
      });
    } catch (e) {
      els.err.textContent = 'Camera permission denied or unavailable: ' + e.message;
      return false;
    }

    video = $('video');
    video.srcObject = stream;
    await new Promise(r => { video.onloadedmetadata = r; });
    await video.play();

    // canvases
    liveCv = $('liveCanvas');
    liveCtx = liveCv.getContext('2d', { willReadFrequently: true });
    eventCv = $('eventCanvas');
    eventCtx = eventCv.getContext('2d');
    hiddenCv = document.createElement('canvas');
    hiddenCv.width = W; hiddenCv.height = H;
    hiddenCtx = hiddenCv.getContext('2d', { willReadFrequently: true });

    return true;
  }

  function stopCamera() {
    if (rafId) cancelAnimationFrame(rafId);
    if (stream) stream.getTracks().forEach(t => t.stop());
    stream = null;
  }

  // --- per-pixel statistics (Welford) ---
  function updateBaseline(data) {
    calibFrames++;
    for (let i = 0; i < N; i++) {
      const v = data[i * 4];           // R channel as luminance proxy (close enough on grayscale-ish covered sensor)
      const oldMean = pxMean[i];
      const newMean = oldMean + (v - oldMean) / calibFrames;
      pxMean[i] = newMean;
      pxM2[i] += (v - oldMean) * (v - newMean);
    }
  }

  function stdOf(i) {
    if (calibFrames < 2) return 1;
    return Math.sqrt(pxM2[i] / (calibFrames - 1)) || 1;
  }

  // --- detection ---
  function findEvents(data) {
    const flags = new Uint8Array(N);
    let nBright = 0;
    for (let i = 0; i < N; i++) {
      const v = data[i * 4];
      if (v < ABS_FLOOR) continue;
      const mean = pxMean[i];
      const std = stdOf(i);
      const dev = (v - mean) / std;
      if (dev > SIGMA_THRESHOLD) {
        // hot pixel mask
        if (detectFrames > HOT_PIXEL_GRACE) {
          const fireRate = pxFires[i] / detectFrames;
          if (fireRate > HOT_PIXEL_RATE) continue;
        }
        flags[i] = 1;
        nBright++;
        pxFires[i]++;
      }
    }
    if (nBright < MIN_CLUSTER) return null;

    // cluster: simple 8-connected flood-fill, find the largest cluster
    const visited = new Uint8Array(N);
    let best = null;
    for (let i = 0; i < N; i++) {
      if (flags[i] && !visited[i]) {
        const cluster = floodFill(flags, visited, i);
        if (cluster.length >= MIN_CLUSTER) {
          // compute centroid + max brightness + total sigma sum
          let cx = 0, cy = 0, maxBright = 0, totalDev = 0;
          for (const idx of cluster) {
            const x = idx % W, y = (idx / W) | 0;
            cx += x; cy += y;
            const v = data[idx * 4];
            if (v > maxBright) maxBright = v;
            totalDev += (v - pxMean[idx]) / stdOf(idx);
          }
          cx /= cluster.length; cy /= cluster.length;
          const ev = { size: cluster.length, cx, cy, maxBright, totalDev, pixels: cluster };
          if (!best || ev.totalDev > best.totalDev) best = ev;
        }
      }
    }
    return best;
  }

  function floodFill(flags, visited, start) {
    const cluster = [];
    const stack = [start];
    while (stack.length) {
      const i = stack.pop();
      if (visited[i] || !flags[i]) continue;
      visited[i] = 1;
      cluster.push(i);
      const x = i % W, y = (i / W) | 0;
      for (let dy = -1; dy <= 1; dy++) {
        for (let dx = -1; dx <= 1; dx++) {
          if (dx === 0 && dy === 0) continue;
          const nx = x + dx, ny = y + dy;
          if (nx < 0 || nx >= W || ny < 0 || ny >= H) continue;
          const ni = ny * W + nx;
          if (flags[ni] && !visited[ni]) stack.push(ni);
        }
      }
    }
    return cluster;
  }

  function saveEventToCanvas(data, ev) {
    // Render the surrounding patch (32×32 around centroid) to eventCanvas
    const PATCH = 32;
    const sx = Math.max(0, Math.min(W - PATCH, Math.round(ev.cx - PATCH/2)));
    const sy = Math.max(0, Math.min(H - PATCH, Math.round(ev.cy - PATCH/2)));
    const id = eventCtx.createImageData(PATCH, PATCH);
    for (let y = 0; y < PATCH; y++) {
      for (let x = 0; x < PATCH; x++) {
        const src = ((sy + y) * W + (sx + x)) * 4;
        const dst = (y * PATCH + x) * 4;
        id.data[dst    ] = data[src    ];
        id.data[dst + 1] = data[src + 1];
        id.data[dst + 2] = data[src + 2];
        id.data[dst + 3] = 255;
      }
    }
    eventCv.width = PATCH; eventCv.height = PATCH;
    eventCtx.putImageData(id, 0, 0);
  }

  function logEvent(ev) {
    totalEvents++;
    const now = new Date();
    const t = now.toLocaleTimeString();
    const empty = els.feed.querySelector('.empty');
    if (empty) empty.remove();
    const div = document.createElement('div');
    div.className = 'ev';
    div.innerHTML = `<span class="ev-t">${t}</span><span class="ev-b">${ev.size}px · ${ev.maxBright}/255 · ${ev.totalDev.toFixed(1)}σ</span>`;
    els.feed.insertBefore(div, els.feed.firstChild);
    if (els.feed.children.length > 50) els.feed.removeChild(els.feed.lastChild);

    // persist
    try {
      const log = JSON.parse(localStorage.getItem('cr_events') || '[]');
      log.push({ ts: now.toISOString(), size: ev.size, max: ev.maxBright, sigma: ev.totalDev });
      if (log.length > 500) log.splice(0, log.length - 500);
      localStorage.setItem('cr_events', JSON.stringify(log));
    } catch {}
  }

  // --- main loop ---
  function tick(now) {
    rafId = requestAnimationFrame(tick);
    if (now - lastFrameTs < 1000 / TARGET_FPS) return;
    lastFrameTs = now;

    // draw video frame to hidden canvas at downsampled res
    if (!video.videoWidth) return;
    hiddenCtx.drawImage(video, 0, 0, W, H);
    const imgData = hiddenCtx.getImageData(0, 0, W, H);
    const data = imgData.data;

    // mirror to live preview (boost contrast for display)
    liveCtx.putImageData(imgData, 0, 0);

    if (calibFrames < CALIB_FRAMES) {
      updateBaseline(data);
      const p = (calibFrames / CALIB_FRAMES) * 100;
      els.calibBar.style.width = p.toFixed(1) + '%';
      els.calibStatus.textContent = `calibrating ${calibFrames}/${CALIB_FRAMES} frames`;
      if (calibFrames === CALIB_FRAMES) enterDetectPhase();
      return;
    }

    // detection phase
    detectFrames++;
    const ev = findEvents(data);
    if (ev) {
      saveEventToCanvas(data, ev);
      logEvent(ev);
    }

    // update HUD every ~10 frames
    if (detectFrames % 10 === 0) {
      const elapsedS = (now - runStart) / 1000;
      els.runtime.textContent = formatDuration(elapsedS);
      els.frames.textContent = detectFrames;
      els.nEvents.textContent = totalEvents;
      if (elapsedS > 5) {
        const eventsPerHour = totalEvents / elapsedS * 3600;
        els.rate.textContent = eventsPerHour.toFixed(2);
      }
    }
  }

  function formatDuration(s) {
    if (s < 60) return s.toFixed(0) + ' s';
    if (s < 3600) return Math.floor(s/60) + 'm ' + Math.floor(s%60) + 's';
    return Math.floor(s/3600) + 'h ' + Math.floor((s%3600)/60) + 'm';
  }

  // --- phase wiring ---
  els.start.addEventListener('click', async () => {
    els.start.disabled = true;
    els.start.textContent = 'starting…';
    const ok = await startCamera();
    if (!ok) {
      els.start.disabled = false;
      els.start.textContent = 'Try again';
      return;
    }
    els.phase1.classList.add('hidden');
    els.phase2.classList.remove('hidden');
    els.phase2.classList.add('active');
    rafId = requestAnimationFrame(tick);
  });

  function enterDetectPhase() {
    els.phase2.classList.add('hidden');
    els.phase3.classList.remove('hidden');
    els.phase3.classList.add('active');
    runStart = performance.now();
  }

  els.stop.addEventListener('click', () => {
    stopCamera();
    els.stop.textContent = 'Stopped — reload to start again';
    els.stop.disabled = true;
  });

  // cleanup
  window.addEventListener('beforeunload', stopCamera);
})();
</script>
</body>
</html>