2026-05-18-19-56-47 重构双视频同步与单帧对比

2026-05-18 20:11:52 +08:00
parent 72c96828d5
commit 88cbcc65c2
9 changed files with 727 additions and 32 deletions
--- a/backend/main.py
+++ b/backend/main.py
@@ -1,5 +1,6 @@
 from __future__ import annotations

+import subprocess
 import shutil
 import uuid
 from pathlib import Path
@@ -101,6 +102,9 @@ def _save_frame_outputs(
    method: str,
    frame,
    output,
+    source_time: float | None = None,
+    result_time: float | None = None,
+    result_index: int | None = None,
 ) -> dict[str, Any]:
    method_path = job_path / method
    method_path.mkdir(exist_ok=True)
@@ -110,7 +114,7 @@ def _save_frame_outputs(
    cv2.imwrite(str(original_path), frame)
    cv2.imwrite(str(mask_path), output.mask)
    cv2.imwrite(str(overlay_path), output.overlay)
-    return {
+    payload = {
        "frame_index": frame_index,
        "method": method,
        "original_url": _public(original_path),
@@ -118,6 +122,44 @@ def _save_frame_outputs(
        "overlay_url": _public(overlay_path),
        "metrics": output.metrics,
    }
+    if source_time is not None:
+        payload["source_time"] = round(float(source_time), 4)
+    if result_time is not None:
+        payload["result_time"] = round(float(result_time), 4)
+    if result_index is not None:
+        payload["result_index"] = int(result_index)
+    return payload
+
+
+def _browser_video(raw_path: Path, final_path: Path) -> Path:
+    ffmpeg = shutil.which("ffmpeg")
+    if ffmpeg:
+        subprocess.run(
+            [
+                ffmpeg,
+                "-y",
+                "-i",
+                str(raw_path),
+                "-c:v",
+                "libx264",
+                "-pix_fmt",
+                "yuv420p",
+                "-movflags",
+                "+faststart",
+                "-preset",
+                "veryfast",
+                "-crf",
+                "20",
+                str(final_path),
+            ],
+            check=True,
+            capture_output=True,
+            text=True,
+        )
+        raw_path.unlink(missing_ok=True)
+    else:
+        raw_path.replace(final_path)
+    return final_path


 def _process_image(job_path: Path, source: Path, method: str, sensitivity: float) -> dict[str, Any]:
@@ -126,13 +168,13 @@ def _process_image(job_path: Path, source: Path, method: str, sensitivity: float
        raise HTTPException(status_code=400, detail="无法读取图片")
    if method == "compare":
        results = [
-            _save_frame_outputs(job_path, 0, item.method, frame, item)
+            _save_frame_outputs(job_path, 0, item.method, frame, item, 0.0, 0.0, 0)
            for item in compare_frame(frame, None, sensitivity)
        ]
    else:
        output = segment_frame(frame, method, None, sensitivity)
-        results = [_save_frame_outputs(job_path, 0, method, frame, output)]
-    return {"kind": "image", "frames": results, "video_url": None}
+        results = [_save_frame_outputs(job_path, 0, method, frame, output, 0.0, 0.0, 0)]
+    return {"kind": "image", "frames": results, "video_url": None, "source_fps": 1.0, "result_fps": 1.0, "duration": 0.0}


 def _selected_frame(index: int, stride: int, selected_count: int, max_frames: int) -> bool:
@@ -156,7 +198,14 @@ def _process_video(
    frame_index = 0
    selected_count = 0
    writer = None
+    result_fps = 8.0
+    raw_video_path = job_path / f"{method}_overlay.raw.mp4"
    video_path = job_path / f"{method}_overlay.mp4"
+    source_fps = float(capture.get(cv2.CAP_PROP_FPS) or 0.0)
+    if source_fps <= 0:
+        source_fps = 12.0
+    frame_count = int(capture.get(cv2.CAP_PROP_FRAME_COUNT) or 0)
+    duration = round(frame_count / source_fps, 4) if frame_count else 0.0

    try:
        while True:
@@ -171,16 +220,38 @@ def _process_video(
            if method == "compare":
                outputs = compare_frame(frame, previous, sensitivity)
                for output in outputs:
-                    frames.append(_save_frame_outputs(job_path, frame_index, output.method, frame, output))
+                    frames.append(
+                        _save_frame_outputs(
+                            job_path,
+                            frame_index,
+                            output.method,
+                            frame,
+                            output,
+                            frame_index / source_fps,
+                            selected_count / result_fps,
+                            selected_count,
+                        )
+                    )
                video_output = next(item for item in outputs if item.method == "fusion")
            else:
                video_output = segment_frame(frame, method, previous, sensitivity)
-                frames.append(_save_frame_outputs(job_path, frame_index, method, frame, video_output))
+                frames.append(
+                    _save_frame_outputs(
+                        job_path,
+                        frame_index,
+                        method,
+                        frame,
+                        video_output,
+                        frame_index / source_fps,
+                        selected_count / result_fps,
+                        selected_count,
+                    )
+                )

            if writer is None:
                height, width = video_output.overlay.shape[:2]
                fourcc = cv2.VideoWriter_fourcc(*"mp4v")
-                writer = cv2.VideoWriter(str(video_path), fourcc, 8.0, (width, height))
+                writer = cv2.VideoWriter(str(raw_video_path), fourcc, result_fps, (width, height))
            writer.write(video_output.overlay)

            selected_count += 1
@@ -193,7 +264,39 @@ def _process_video(

    if not frames:
        raise HTTPException(status_code=400, detail="视频没有可处理帧")
-    return {"kind": "video", "frames": frames, "video_url": _public(video_path) if video_path.exists() else None}
+    if raw_video_path.exists():
+        _browser_video(raw_video_path, video_path)
+    return {
+        "kind": "video",
+        "frames": frames,
+        "video_url": _public(video_path) if video_path.exists() else None,
+        "source_fps": round(source_fps, 4),
+        "result_fps": result_fps,
+        "duration": duration,
+        "result_duration": round(len({frame["result_index"] for frame in frames}) / result_fps, 4) if frames else 0.0,
+    }
+
+
+def _read_video_frame(source: Path, frame_index: int) -> tuple[Any, Any | None, float]:
+    capture = cv2.VideoCapture(str(source))
+    if not capture.isOpened():
+        raise HTTPException(status_code=400, detail="无法读取视频")
+    source_fps = float(capture.get(cv2.CAP_PROP_FPS) or 0.0)
+    if source_fps <= 0:
+        source_fps = 12.0
+    frame_index = max(0, int(frame_index))
+    previous = None
+    if frame_index > 0:
+        capture.set(cv2.CAP_PROP_POS_FRAMES, frame_index - 1)
+        ok_prev, previous = capture.read()
+        if not ok_prev:
+            previous = None
+    capture.set(cv2.CAP_PROP_POS_FRAMES, frame_index)
+    ok, frame = capture.read()
+    capture.release()
+    if not ok:
+        raise HTTPException(status_code=400, detail="无法读取指定帧")
+    return frame, previous, source_fps


@app.post("/api/segment")
@@ -231,6 +334,44 @@ def segment(
    }


+@app.post("/api/compare-frame")
+def compare_single_frame(
+    file: UploadFile = File(...),
+    frame_index: int = Form(0),
+    sensitivity: float = Form(0.56),
+) -> dict[str, Any]:
+    ensure_dirs()
+    sensitivity = max(0.05, min(float(sensitivity), 0.95))
+    job_id = uuid.uuid4().hex[:12]
+    job_path = JOB_DIR / job_id
+    job_path.mkdir(parents=True, exist_ok=True)
+    source = _save_upload(file, job_path)
+    suffix = source.suffix.lower()
+    if suffix in IMAGE_SUFFIXES:
+        frame = cv2.imread(str(source), cv2.IMREAD_COLOR)
+        previous = None
+        source_time = 0.0
+    elif suffix in VIDEO_SUFFIXES:
+        frame, previous, source_fps = _read_video_frame(source, frame_index)
+        source_time = int(frame_index) / source_fps
+    else:
+        raise HTTPException(status_code=400, detail="不支持的文件类型")
+    if frame is None:
+        raise HTTPException(status_code=400, detail="无法读取文件")
+    outputs = compare_frame(frame, previous, sensitivity)
+    frames = [
+        _save_frame_outputs(job_path, int(frame_index), output.method, frame, output, source_time, 0.0, 0)
+        for output in outputs
+    ]
+    return {
+        "job_id": job_id,
+        "kind": "compare",
+        "frame_index": int(frame_index),
+        "source_time": round(float(source_time), 4),
+        "frames": frames,
+    }
+
+
@app.get("/")
 def index() -> FileResponse:
    return FileResponse(FRONTEND_DIR / "index.html")
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -18,6 +18,9 @@ const videoPreview = document.querySelector("#videoPreview");
 const imagePreview = document.querySelector("#imagePreview");
 const progressWrap = document.querySelector("#progressWrap");
 const progressText = document.querySelector("#progressText");
+const progressBar = document.querySelector("#progressBar");
+const resultVideoPreview = document.querySelector("#resultVideoPreview");
+const resultVideoEmpty = document.querySelector("#resultVideoEmpty");
 const summaryStrip = document.querySelector("#summaryStrip");
 const summaryJob = document.querySelector("#summaryJob");
 const summaryFrames = document.querySelector("#summaryFrames");
@@ -34,23 +37,67 @@ const closeSourceDialog = document.querySelector("#closeSourceDialog");
 const sourceTitle = document.querySelector("#sourceTitle");
 const sourceVideo = document.querySelector("#sourceVideo");
 const sourceImage = document.querySelector("#sourceImage");
+const openCompareButton = document.querySelector("#openCompareButton");
+const controlCompareButton = document.querySelector("#controlCompareButton");
+const compareDialog = document.querySelector("#compareDialog");
+const closeCompareDialog = document.querySelector("#closeCompareDialog");
+const compareGrid = document.querySelector("#compareGrid");
+const compareTitle = document.querySelector("#compareTitle");

 const methodLabels = new Map();
 const methodDescriptions = new Map();
 let selectedFile = null;
 let currentObjectUrl = null;
 let lastFrames = [];
+let lastResult = null;
+let currentFrame = null;
+let syncLock = false;
+let progressTimers = [];

 function setBusy(isBusy, text = "运行分割") {
  const button = form.querySelector(".primary");
  button.disabled = isBusy;
  button.querySelector("span").textContent = isBusy ? "分割中" : text;
-  progressWrap.hidden = !isBusy;
  if (isBusy) {
-    progressText.textContent = "正在上传、抽帧并执行导丝分割";
+    progressWrap.hidden = false;
+    setProgress(8, "正在上传、抽帧并执行导丝分割");
  }
 }

+function setProgress(percent, text) {
+  progressBar.style.width = `${Math.max(0, Math.min(100, percent))}%`;
+  progressText.textContent = text;
+}
+
+function scheduleProgress() {
+  progressTimers.forEach((timer) => clearTimeout(timer));
+  progressTimers = [
+    setTimeout(() => setProgress(28, "正在读取视频并抽取关键帧"), 400),
+    setTimeout(() => setProgress(58, "正在生成导丝掩膜与叠加视频"), 1400),
+    setTimeout(() => setProgress(82, "正在整理结果帧与指标"), 2800),
+  ];
+}
+
+function finishProgress() {
+  progressTimers.forEach((timer) => clearTimeout(timer));
+  progressTimers = [];
+  setProgress(100, "分割完成");
+  setTimeout(() => {
+    progressWrap.hidden = true;
+    progressBar.style.width = "0%";
+  }, 650);
+}
+
+function failProgress(message) {
+  progressTimers.forEach((timer) => clearTimeout(timer));
+  progressTimers = [];
+  setProgress(100, message || "分割失败");
+  setTimeout(() => {
+    progressWrap.hidden = true;
+    progressBar.style.width = "0%";
+  }, 900);
+}
+
 function setFile(file) {
  selectedFile = file;
  if (typeof DataTransfer !== "undefined") {
@@ -60,6 +107,7 @@ function setFile(file) {
  }
  fileName.textContent = `${file.name} · ${(file.size / 1024 / 1024).toFixed(2)} MB`;
  renderPreview(file);
+  resetResultsForNewInput();
 }

 function revokePreview() {
@@ -125,6 +173,7 @@ async function loadMethods() {
  methodSelect.innerHTML = "";
  methodGrid.innerHTML = "";
  Object.entries(data.methods).forEach(([key, value]) => {
+    if (key === "compare") return;
    methodLabels.set(key, value.label);
    methodDescriptions.set(key, value.description);

@@ -154,7 +203,22 @@ function updateSummary(data) {
  summarySkeleton.textContent = Math.round(skeleton);
  summaryStrip.hidden = false;
  resultCount.textContent = `${frames.length} 个结果`;
-  jobMeta.textContent = `${data.kind === "video" ? "视频" : "图像"} · ${methodLabels.get(data.method) || data.method}`;
+}
+
+function resetResultsForNewInput() {
+  lastFrames = [];
+  lastResult = null;
+  currentFrame = null;
+  resultGrid.innerHTML = "";
+  resultVideoPreview.hidden = true;
+  resultVideoPreview.removeAttribute("src");
+  resultVideoEmpty.hidden = false;
+  emptyState.hidden = false;
+  emptyState.textContent = "已加载输入。点击左侧“运行分割”生成导丝掩膜和叠加结果。";
+  summaryStrip.hidden = true;
+  videoLink.hidden = true;
+  resultCount.textContent = "0 个结果";
+  setCompareEnabled(false);
 }

 function openDetail(frame) {
@@ -174,6 +238,7 @@ function openDetail(frame) {
 }

 function renderResults(data) {
+  lastResult = data;
  lastFrames = data.frames || [];
  resultGrid.innerHTML = "";
  emptyState.hidden = lastFrames.length > 0;
@@ -181,10 +246,19 @@ function renderResults(data) {
  if (data.video_url) {
    videoLink.href = data.video_url;
    videoLink.setAttribute("download", "");
+    resultVideoPreview.preload = "metadata";
+    resultVideoPreview.src = data.video_url;
+    resultVideoPreview.load();
+    resultVideoPreview.hidden = false;
+    resultVideoEmpty.hidden = true;
+  } else {
+    resultVideoPreview.hidden = true;
+    resultVideoPreview.removeAttribute("src");
+    resultVideoEmpty.hidden = false;
  }
  updateSummary(data);

-  lastFrames.forEach((frame) => {
+  lastFrames.forEach((frame, index) => {
    const node = template.content.firstElementChild.cloneNode(true);
    node.querySelector(".method").textContent = methodLabels.get(frame.method) || frame.method;
    node.querySelector(".frame-index").textContent = `帧 ${frame.frame_index}`;
@@ -192,12 +266,16 @@ function renderResults(data) {
    node.querySelector(".coverage").textContent = `${(frame.metrics.coverage * 100).toFixed(3)}%`;
    node.querySelector(".skeleton").textContent = frame.metrics.skeleton_length;
    node.querySelector(".components").textContent = frame.metrics.components;
-    node.addEventListener("click", () => openDetail(frame));
+    node.dataset.frameIndex = frame.frame_index;
+    node.addEventListener("click", () => selectFrame(frame, index));
    node.addEventListener("keydown", (event) => {
-      if (event.key === "Enter") openDetail(frame);
+      if (event.key === "Enter") selectFrame(frame, index);
    });
    resultGrid.appendChild(node);
  });
+  if (lastFrames.length) {
+    selectFrame(lastFrames[0], 0);
+  }
 }

 async function loadSample() {
@@ -240,7 +318,11 @@ function clearAll() {
  sourceImage.hidden = true;
  sourceVideo.removeAttribute("src");
  sourceImage.removeAttribute("src");
+  resultVideoPreview.hidden = true;
+  resultVideoPreview.removeAttribute("src");
+  resultVideoEmpty.hidden = false;
  openSourceButton.hidden = true;
+  setCompareEnabled(false);
  sourcePaneTitle.textContent = "查看原始视频";
  if (sourceDialog.open) sourceDialog.close();
  previewEmpty.hidden = false;
@@ -250,6 +332,146 @@ function clearAll() {
  videoLink.hidden = true;
  resultCount.textContent = "0 个结果";
  jobMeta.textContent = "等待输入";
+  lastFrames = [];
+  lastResult = null;
+  currentFrame = null;
+}
+
+function setCompareEnabled(enabled) {
+  openCompareButton.disabled = !enabled;
+  controlCompareButton.disabled = !enabled;
+}
+
+function selectFrame(frame, index = 0) {
+  currentFrame = frame;
+  [...resultGrid.querySelectorAll(".result-card")].forEach((node) => {
+    node.classList.toggle("is-selected", Number(node.dataset.frameIndex) === Number(frame.frame_index));
+  });
+  syncLock = true;
+  seekMedia(videoPreview, frame.source_time);
+  seekMedia(resultVideoPreview, frame.result_time);
+  syncLock = false;
+  setCompareEnabled(Boolean(selectedFile && frame));
+  resultCount.textContent = `${lastFrames.length} 个结果 · 当前帧 ${frame.frame_index}`;
+}
+
+function seekMedia(media, time) {
+  if (!media || media.hidden || !Number.isFinite(time)) return;
+  if (Math.abs(media.currentTime - time) > 0.04) {
+    media.currentTime = Math.max(0, time);
+  }
+}
+
+function nearestFrameBy(source, time) {
+  if (!lastFrames.length) return null;
+  const key = source === "result" ? "result_time" : "source_time";
+  return lastFrames.reduce((best, frame) => {
+    const bestValue = Number.isFinite(best[key]) ? best[key] : 0;
+    const value = Number.isFinite(frame[key]) ? frame[key] : 0;
+    const bestDistance = Math.abs(bestValue - time);
+    const distance = Math.abs(value - time);
+    return distance < bestDistance ? frame : best;
+  }, lastFrames[0]);
+}
+
+function syncVideos(source, time) {
+  if (syncLock || !lastFrames.length) return;
+  const frame = nearestFrameBy(source, time);
+  if (!frame) return;
+  currentFrame = frame;
+  syncLock = true;
+  if (source === "source" && !resultVideoPreview.hidden && Number.isFinite(frame.result_time)) {
+    seekMedia(resultVideoPreview, frame.result_time);
+  }
+  if (source === "result" && !videoPreview.hidden && Number.isFinite(frame.source_time)) {
+    seekMedia(videoPreview, frame.source_time);
+  }
+  syncLock = false;
+  [...resultGrid.querySelectorAll(".result-card")].forEach((node) => {
+    node.classList.toggle("is-selected", Number(node.dataset.frameIndex) === Number(frame.frame_index));
+  });
+  setCompareEnabled(Boolean(selectedFile && frame));
+  resultCount.textContent = `${lastFrames.length} 个结果 · 当前帧 ${frame.frame_index}`;
+}
+
+function createMetricBlock(frame) {
+  const metrics = document.createElement("dl");
+  metrics.className = "metrics";
+  [
+    ["覆盖率", `${(frame.metrics.coverage * 100).toFixed(3)}%`],
+    ["骨架", frame.metrics.skeleton_length],
+    ["连通域", frame.metrics.components],
+  ].forEach(([label, value]) => {
+    const item = document.createElement("div");
+    const dt = document.createElement("dt");
+    const dd = document.createElement("dd");
+    dt.textContent = label;
+    dd.textContent = value;
+    item.append(dt, dd);
+    metrics.appendChild(item);
+  });
+  return metrics;
+}
+
+function renderCompareFrames(frames) {
+  compareGrid.innerHTML = "";
+  frames.forEach((frame) => {
+    const card = document.createElement("article");
+    card.className = "compare-card";
+
+    const top = document.createElement("div");
+    top.className = "card-top";
+    const method = document.createElement("span");
+    method.className = "method";
+    method.textContent = methodLabels.get(frame.method) || frame.method;
+    const index = document.createElement("span");
+    index.className = "frame-index";
+    index.textContent = `帧 ${frame.frame_index}`;
+    top.append(method, index);
+
+    const figure = document.createElement("figure");
+    const image = document.createElement("img");
+    image.src = frame.overlay_url;
+    image.alt = `${method.textContent} 叠加结果`;
+    const caption = document.createElement("figcaption");
+    caption.textContent = "当前帧叠加视图";
+    figure.append(image, caption);
+
+    card.append(top, figure, createMetricBlock(frame));
+    compareGrid.appendChild(card);
+  });
+}
+
+async function openCompareForCurrentFrame() {
+  if (!selectedFile || !currentFrame) return;
+  setCompareEnabled(false);
+  compareTitle.textContent = `当前帧 ${currentFrame.frame_index} 多方法对比`;
+  compareGrid.innerHTML = '<div class="compare-loading">正在生成当前帧多方法对比。</div>';
+  if (!compareDialog.open) compareDialog.showModal();
+
+  try {
+    const payload = new FormData();
+    payload.set("file", selectedFile);
+    payload.set("frame_index", currentFrame.frame_index);
+    payload.set("sensitivity", sensitivity.value);
+    const response = await fetch("/api/compare-frame", {
+      method: "POST",
+      body: payload,
+    });
+    const data = await response.json();
+    if (!response.ok) {
+      throw new Error(data.detail || "多方法对比失败");
+    }
+    renderCompareFrames(data.frames || []);
+  } catch (error) {
+    compareGrid.innerHTML = "";
+    const message = document.createElement("div");
+    message.className = "compare-loading";
+    message.textContent = error.message || "多方法对比失败";
+    compareGrid.appendChild(message);
+  } finally {
+    setCompareEnabled(Boolean(selectedFile && currentFrame));
+  }
 }

 sensitivity.addEventListener("input", () => {
@@ -284,6 +506,25 @@ sampleButton.addEventListener("click", loadSample);
 clearButton.addEventListener("click", clearAll);
 closeDialog.addEventListener("click", () => detailDialog.close());
 closeSourceDialog.addEventListener("click", () => sourceDialog.close());
+closeCompareDialog.addEventListener("click", () => compareDialog.close());
+openCompareButton.addEventListener("click", openCompareForCurrentFrame);
+controlCompareButton.addEventListener("click", openCompareForCurrentFrame);
+
+videoPreview.addEventListener("seeked", () => syncVideos("source", videoPreview.currentTime));
+resultVideoPreview.addEventListener("seeked", () => syncVideos("result", resultVideoPreview.currentTime));
+videoPreview.addEventListener("play", () => {
+  if (!syncLock && !resultVideoPreview.hidden) resultVideoPreview.play().catch(() => {});
+});
+resultVideoPreview.addEventListener("play", () => {
+  if (!syncLock && !videoPreview.hidden) videoPreview.play().catch(() => {});
+});
+videoPreview.addEventListener("pause", () => {
+  if (!syncLock && !resultVideoPreview.hidden) resultVideoPreview.pause();
+});
+resultVideoPreview.addEventListener("pause", () => {
+  if (!syncLock && !videoPreview.hidden) videoPreview.pause();
+});
+
 openSourceButton.addEventListener("click", () => {
  if (!selectedFile || !currentObjectUrl) return;
  sourceVideo.hidden = true;
@@ -315,9 +556,15 @@ form.addEventListener("submit", async (event) => {
  }

  setBusy(true);
+  scheduleProgress();
+  setCompareEnabled(false);
+  currentFrame = null;
  emptyState.hidden = false;
  emptyState.textContent = "正在抽帧和分割，请稍候。";
  resultGrid.innerHTML = "";
+  resultVideoPreview.hidden = true;
+  resultVideoPreview.removeAttribute("src");
+  resultVideoEmpty.hidden = false;
  videoLink.hidden = true;

  try {
@@ -332,9 +579,11 @@ form.addEventListener("submit", async (event) => {
      throw new Error(data.detail || "分割失败");
    }
    renderResults(data);
+    finishProgress();
  } catch (error) {
    emptyState.hidden = false;
    emptyState.textContent = error.message;
+    failProgress(error.message || "分割失败");
  } finally {
    setBusy(false);
  }
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -77,6 +77,9 @@
          <button class="primary" type="submit">
            <span>运行分割</span>
          </button>
+          <button class="ghost compare-entry" id="controlCompareButton" type="button" disabled>
+            多方法对比
+          </button>
        </form>

        <section class="viewer">
@@ -104,9 +107,9 @@
              <div class="pane-head">
                <div>
                  <p class="eyebrow">Live Workspace</p>
-                  <h2>预览与结果</h2>
+                  <h2>预览与结果视频</h2>
                </div>
-                <span id="resultCount">0 个结果</span>
+                <button class="ghost media-button" id="openCompareButton" type="button" disabled>多方法对比</button>
              </div>

              <div class="progress-wrap" id="progressWrap" hidden>
@@ -114,6 +117,23 @@
                <p id="progressText">准备任务</p>
              </div>

+              <div class="result-video-stage">
+                <div class="preview-empty" id="resultVideoEmpty">运行分割后，这里会显示叠加结果视频。</div>
+                <video id="resultVideoPreview" controls muted hidden></video>
+              </div>
+            </section>
+          </div>
+
+          <section class="workspace-pane frame-browser">
+            <div class="pane-head">
+              <div>
+                <p class="eyebrow">Frame Review</p>
+                <h2>预览与结果查看</h2>
+              </div>
+              <span id="resultCount">0 个结果</span>
+            </div>
+
+            <div class="frame-browser-body">
              <div class="summary-strip" id="summaryStrip" hidden>
                <div><span>任务</span><strong id="summaryJob">-</strong></div>
                <div><span>帧数</span><strong id="summaryFrames">-</strong></div>
@@ -123,10 +143,10 @@

              <div class="empty" id="emptyState">运行分割后，这里会显示原帧、叠加图、掩膜和指标。</div>
              <div class="result-grid" id="resultGrid"></div>
-            </section>
            </div>
          </section>
        </section>
+      </section>
    </main>

    <dialog class="detail-dialog" id="detailDialog">
@@ -168,6 +188,17 @@
      </div>
    </dialog>

+    <dialog class="detail-dialog compare-dialog" id="compareDialog">
+      <div class="dialog-head">
+        <div>
+          <p class="eyebrow">Method Compare</p>
+          <h2 id="compareTitle">当前帧多方法对比</h2>
+        </div>
+        <button class="icon-button" id="closeCompareDialog" type="button" aria-label="关闭多方法对比">×</button>
+      </div>
+      <div class="compare-grid" id="compareGrid"></div>
+    </dialog>
+
    <template id="resultCardTemplate">
      <article class="result-card" tabindex="0">
        <div class="card-top">
--- a/frontend/styles.css
+++ b/frontend/styles.css
@@ -264,7 +264,14 @@ h3 {
  color: var(--text);
 }

-.ghost:hover,
+.ghost:disabled {
+  cursor: not-allowed;
+  color: var(--faint);
+  border-color: var(--line-soft);
+  opacity: 0.62;
+}
+
+.ghost:not(:disabled):hover,
 .method-option:hover,
 .result-card:hover {
  border-color: rgba(255, 209, 102, 0.62);
@@ -284,6 +291,18 @@ h3 {
  filter: grayscale(0.45);
 }

+.compare-entry {
+  min-height: 46px;
+  border-color: rgba(56, 216, 184, 0.5);
+  color: var(--accent-2);
+  font-weight: 900;
+}
+
+.compare-entry:disabled {
+  border-color: var(--line);
+  color: var(--faint);
+}
+
 .method-grid {
  display: grid;
  gap: 8px;
@@ -419,6 +438,20 @@ input[type="range"] {
  overflow: hidden;
 }

+.result-video-stage {
+  display: grid;
+  place-items: center;
+  min-height: 590px;
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  background:
+    linear-gradient(90deg, rgba(56, 216, 184, 0.035) 1px, transparent 1px),
+    linear-gradient(rgba(56, 216, 184, 0.035) 1px, transparent 1px),
+    #080a09;
+  background-size: 28px 28px;
+  overflow: hidden;
+}
+
 .preview-empty,
 .empty {
  color: var(--muted);
@@ -427,7 +460,8 @@ input[type="range"] {
 }

 #videoPreview,
-#imagePreview {
+#imagePreview,
+#resultVideoPreview {
  display: block;
  width: 100%;
  max-height: 590px;
@@ -452,11 +486,11 @@ input[type="range"] {

 .progress-line span {
  display: block;
-  width: 12%;
+  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
-  animation: pulse-progress 1.4s ease-in-out infinite alternate;
+  transition: width 320ms ease;
 }

 .progress-wrap p {
@@ -464,15 +498,6 @@ input[type="range"] {
  color: var(--muted);
 }

-@keyframes pulse-progress {
-  from {
-    width: 18%;
-  }
-  to {
-    width: 92%;
-  }
-}
-
 .summary-strip {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
@@ -515,7 +540,7 @@ input[type="range"] {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
-  max-height: 590px;
+  max-height: 520px;
  overflow: auto;
 }

@@ -532,6 +557,11 @@ input[type="range"] {
  transform: translateY(-1px);
 }

+.result-card.is-selected {
+  border-color: rgba(56, 216, 184, 0.88);
+  box-shadow: inset 0 0 0 1px rgba(56, 216, 184, 0.4);
+}
+
 .card-top {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
@@ -635,6 +665,62 @@ dd {
  width: min(1180px, calc(100vw - 36px));
 }

+.frame-browser {
+  min-height: auto;
+  margin-top: 14px;
+}
+
+.frame-browser-body {
+  display: grid;
+  gap: 12px;
+}
+
+.frame-browser .summary-strip {
+  grid-template-columns: repeat(4, 1fr);
+  margin-top: 0;
+}
+
+.frame-browser .empty {
+  min-height: 170px;
+}
+
+.compare-dialog {
+  width: min(1320px, calc(100vw - 36px));
+}
+
+.compare-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
+  gap: 12px;
+  max-height: min(72vh, 760px);
+  overflow: auto;
+  padding: 16px;
+}
+
+.compare-card {
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  background: #111512;
+  overflow: hidden;
+}
+
+.compare-card img {
+  aspect-ratio: 4 / 3;
+}
+
+.compare-loading {
+  min-height: 220px;
+  display: grid;
+  place-items: center;
+  grid-column: 1 / -1;
+  color: var(--muted);
+  border: 1px solid var(--line);
+  border-radius: 8px;
+  background: rgba(16, 20, 17, 0.72);
+  text-align: center;
+  padding: 24px;
+}
+
 .source-stage {
  display: grid;
  place-items: center;
@@ -683,6 +769,10 @@ dd {
    grid-template-columns: 1fr;
  }

+  .frame-browser .summary-strip {
+    grid-template-columns: 1fr;
+  }
+
  .viewer-split {
    grid-template-columns: 1fr;
  }
@@ -692,6 +782,7 @@ dd {
  }

  .preview-stage,
+  .result-video-stage,
  .empty {
    min-height: 320px;
  }
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -21,6 +21,10 @@ def test_health_and_methods():
    samples = client.get("/api/samples")
    assert samples.status_code == 200
    assert "samples" in samples.json()
+    if samples.json()["samples"]:
+        sample = samples.json()["samples"][0]
+        assert "version" in sample
+        assert "?v=" in sample["url"]


 def test_segment_image(tmp_path: Path):
@@ -36,3 +40,47 @@ def test_segment_image(tmp_path: Path):
    payload = response.json()
    assert payload["kind"] == "image"
    assert payload["frames"][0]["metrics"]["mask_pixels"] > 0
+    assert payload["frames"][0]["source_time"] == 0.0
+    assert payload["frames"][0]["result_time"] == 0.0
+
+
+def test_segment_video_and_compare_frame(tmp_path: Path):
+    video_path = tmp_path / "sample.mp4"
+    writer = cv2.VideoWriter(str(video_path), cv2.VideoWriter_fourcc(*"mp4v"), 12.0, (320, 220))
+    for index in range(18):
+        writer.write(make_frame(index, 320, 220))
+    writer.release()
+
+    with video_path.open("rb") as handle:
+        response = client.post(
+            "/api/segment",
+            files={"file": ("sample.mp4", handle, "video/mp4")},
+            data={"method": "fusion", "sensitivity": "0.58", "frame_stride": "6", "max_frames": "3"},
+        )
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload["kind"] == "video"
+    assert payload["video_url"].endswith(".mp4")
+    assert payload["source_fps"] > 0
+    assert payload["result_fps"] == 8.0
+    assert len(payload["frames"]) == 3
+    first_frame = payload["frames"][0]
+    assert first_frame["source_time"] == 0.0
+    assert first_frame["result_time"] == 0.0
+    assert first_frame["result_index"] == 0
+
+    with video_path.open("rb") as handle:
+        compare = client.post(
+            "/api/compare-frame",
+            files={"file": ("sample.mp4", handle, "video/mp4")},
+            data={"frame_index": str(payload["frames"][1]["frame_index"]), "sensitivity": "0.58"},
+        )
+    assert compare.status_code == 200
+    compare_payload = compare.json()
+    assert compare_payload["kind"] == "compare"
+    assert {frame["method"] for frame in compare_payload["frames"]} == {
+        "hessian_ridge",
+        "edge_morphology",
+        "temporal_difference",
+        "fusion",
+    }
--- a/工程分析/实现方案-2026-05-18-19-56-47.md
+++ b/工程分析/实现方案-2026-05-18-19-56-47.md
@@ -0,0 +1,48 @@
+# 实现方案
+
+开始时间：2026-05-18-19-56-47
+
+## 后端改造
+
+1. 视频分割返回时间映射
+   - 在 `_process_video` 中读取源视频 `fps`、总帧数、时长。
+   - 每个返回帧增加：
+     - `source_time`：源视频中的时间。
+     - `result_time`：结果视频中的时间。
+     - `result_index`：结果视频内部帧序号。
+   - 返回 `source_fps`、`result_fps`、`duration`、`result_duration`。
+
+2. 新增单帧多方法对比接口
+   - `POST /api/compare-frame`
+   - 参数：文件、`frame_index`、`sensitivity`。
+   - 后端定位到对应帧和上一帧，对该帧运行 `compare_frame`，返回多方法图片结果。
+
+## 前端改造
+
+1. 双视频区域
+   - 左侧：原始视频。
+   - 右侧：结果视频。
+   - 右侧标题改为“预览与结果视频”。
+
+2. 视频同步
+   - 维护 `currentFrame` 和后端返回的时间映射。
+   - 点击下方帧列表时同时 seek 原始视频与结果视频。
+   - 用户 seek/play/pause 任一视频时同步另一个视频，使用锁避免递归触发。
+
+3. 下方帧列表
+   - 新增“预览与结果查看”区域。
+   - 复用现有结果图片卡片；点击后设置当前帧并同步两个视频。
+
+4. 多方法对比
+   - 控制面板中移除方法卡片里的“多方法对比”，改为运行按钮下方的独立按钮。
+   - 默认禁用。
+   - 分割完成且当前帧存在时启用。
+   - 点击后调用 `/api/compare-frame`，在弹窗中显示当前帧多方法对比。
+
+5. 进度条
+   - 移除 CSS 无限动画。
+   - 使用 JS 设置固定阶段进度：准备、上传处理、生成结果、完成。
+
+## 注意
+
+结果视频目前由抽样帧组成，因此同步采用返回的 `source_time` 与 `result_time` 映射，并在用户拖动时选择最近的分割帧。
--- a/工程分析/测试方案-2026-05-18-19-56-47.md
+++ b/工程分析/测试方案-2026-05-18-19-56-47.md
@@ -0,0 +1,42 @@
+# 测试方案
+
+开始时间：2026-05-18-19-56-47
+
+## 自动化测试
+
+- `pytest -q`
+- 更新 API 测试：
+  - `/api/samples` 返回版本化样例。
+  - `/api/segment` 视频结果包含 `source_time` 和 `result_time`。
+  - `/api/compare-frame` 可以返回多方法对比结果。
+
+## 运行验证
+
+- `curl -s http://127.0.0.1:8001/api/health`
+- 使用样例视频调用 `/api/segment`。
+- 使用样例视频调用 `/api/compare-frame`。
+- Chrome DevTools Protocol 打开页面、加载样例、运行分割，检查：
+  - 结果视频元素出现。
+  - 帧列表出现。
+  - 多方法对比按钮启用。
+
+## 手工验证
+
+1. 打开 `http://192.168.3.11:8001/`。
+2. 点击“加载样例”。
+3. 点击“运行分割”。
+4. 右侧应显示“预览与结果视频”的视频播放器。
+5. 下方“预览与结果查看”出现结果帧列表。
+6. 点击任一结果帧，原始视频和结果视频同步跳转。
+7. 点击“多方法对比”，查看当前帧的多方法结果。
+
+## 执行结果
+
+- `python3 -m compileall backend tests`：通过。
+- `node --check frontend/app.js`：通过。
+- `pytest -q`：5 passed。
+- `curl http://127.0.0.1:8001/api/health`：服务返回 `ok`。
+- `/api/segment` 使用内置样例视频：返回 H.264 结果视频、`source_time`、`result_time`、`result_index`。
+- `/api/compare-frame` 使用内置样例视频第 24 帧：返回 4 种方法结果。
+- Chrome headless 页面流程：加载样例、运行分割、结果视频展示、12 个结果帧、多方法对比 4 张卡片均通过。
+- Chrome headless 双向同步验证：源视频 seek 到 2 秒后结果视频跳到最近处理帧 0.625 秒；结果视频 seek 到 0.375 秒后源视频跳到对应源帧 1.25 秒。
--- a/工程分析/经验记录.md
+++ b/工程分析/经验记录.md
@@ -117,3 +117,25 @@ B. 产生问题原因：实测 Chrome 自动点击流程可以看到画面，视
 C. 解决问题方案：后端 `/api/samples` 返回带 `mtime_ns` 的版本化 URL；前端加载样例时追加时间戳，并使用 `fetch(..., { cache: "reload" })` 强制绕过旧缓存。

 D. 后续如何避免问题：静态样例、模型文件、前端资源发生兼容性修复时，URL 必须版本化，避免用户浏览器继续使用旧缓存。
+
+## 2026-05-18-19-56-47 双视频同步与当前帧多方法对比
+
+### 1. 结果视频与原始视频时间轴不一致
+
+A. 具体问题：结果视频由抽帧后的叠加帧组成，播放时长和原始视频不同；如果直接用同一个 `currentTime` 同步，会跳到错误画面。
+
+B. 产生问题原因：后端按 `frame_stride` 抽取关键帧，结果视频用固定 `result_fps` 写出，源视频时间轴与结果视频时间轴天然不等长。
+
+C. 解决问题方案：后端为每个结果帧返回 `source_time`、`result_time`、`result_index`；前端点击帧卡片或拖动任一视频时，使用最近结果帧的时间映射同步另一个视频。
+
+D. 后续如何避免问题：凡是结果媒体来自抽样、降帧、裁剪或重编码，都必须在 API 中显式返回源时间与结果时间映射，前端不要假设两个视频时长一致。
+
+### 2. 进度条循环动画造成任务状态误导
+
+A. 具体问题：“正在上传、抽帧并执行导丝分割”的进度条一直往复跳动，看起来像任务卡住或没有真实进度。
+
+B. 产生问题原因：旧样式使用 CSS 无限动画模拟进度，没有和前端请求阶段绑定。
+
+C. 解决问题方案：移除无限动画，改为 JavaScript 按阶段设置固定进度：上传准备、抽帧、生成掩膜和叠加视频、整理结果、完成或失败。
+
+D. 后续如何避免问题：耗时任务即使暂时没有后端实时进度，也要用单向推进的阶段式进度条，避免使用反复跳动的加载条表达处理进度。
--- a/工程分析/需求分析-2026-05-18-19-56-47.md
+++ b/工程分析/需求分析-2026-05-18-19-56-47.md
@@ -0,0 +1,23 @@
+# 需求分析
+
+开始时间：2026-05-18-19-56-47
+
+## 用户目标
+
+用户希望将网页端工作台调整为以视频对照为核心的交互：
+
+1. “正在上传、抽帧并执行导丝分割”的进度条不要一直循环跳动。
+2. “预览与结果”改为“预览与结果视频”，其中内容应是视频。
+3. 下方增加“预览与结果查看”，放置当前图片帧列表；选择某一帧时，原始视频和结果视频跳到对应位置。
+4. 原始视频和预览结果视频同步，调整一个另一个一起调整。
+5. “多方法对比”移动到“运行分割”按钮下方；它只针对当前所在帧有效。运行后在结果视频右侧出现可用的“多方法对比”按钮，点击查看当前帧的多方法对比；原始视频右侧不要显示“视频 · 多方法对比”。
+
+## 验收标准
+
+- 运行分割时进度条为确定式推进，不再循环动画。
+- 右侧面板标题为“预览与结果视频”，主内容是结果视频播放器。
+- 下方有“预览与结果查看”帧列表。
+- 点击帧列表项后，原始视频与结果视频跳到对应位置。
+- 拖动或播放其中一个视频，另一个视频同步。
+- 左侧控制面板中“多方法对比”位于“运行分割”按钮下方。
+- 分割完成前，多方法对比按钮不可用；分割完成并选中帧后，结果视频右侧按钮亮起。