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Date: Mon, 2 Feb 2026 12:11:18 +0800
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新增 2.5 章节：
- Mermaid 时序图展示 ASR/OCR/CV 并行处理与对齐流程
- 说明对齐算法要点：时间轴归一化、模糊匹配窗口、事件合并

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 DevelopmentPlan.md | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/DevelopmentPlan.md b/DevelopmentPlan.md
index 841bedf..cd09cdc 100644
--- a/DevelopmentPlan.md
+++ b/DevelopmentPlan.md
@@ -25,6 +25,7 @@
 | V1.0 | 2026-02-03 | Gemini | 初稿：技术架构、选型、排期 |
 | V1.1 | 2026-02-03 | Claude | 审阅修订：补充 F-05-A/F-45 技术方案、验收标准、数据模型、测试策略 |
 | V1.2 | 2026-02-03 | Claude | Reviewer 修正：Logo检测改向量检索、Brief解析增VLM、弹性GPU、H5防锁屏、排期调整 |
+| V1.2.1 | 2026-02-03 | Claude | 补充多模态时间戳对齐流程图 (Gemini 建议) |
 
 ---
 
@@ -190,6 +191,42 @@ graph TD
 - 时长统计误差 ≤ 0.5秒
 - 频次统计准确率 ≥ 95%
 
+### 2.5 多模态时间戳对齐流程 ⭐ V1.2 补充
+
+> 这是 Phase 2 延长 1 周的核心原因：ASR/OCR/CV 的时间轴需要精确同步。
+
+```mermaid
+sequenceDiagram
+    participant Video as 原始视频
+    participant ASR as ASR引擎
+    participant OCR as OCR引擎
+    participant CV as CV检测
+    participant Alignment as 对齐算法
+    participant Rule as 规则引擎
+
+    par 并行处理
+        Video->>ASR: 提取音频
+        ASR-->>Alignment: 输出: [{text: "品牌", start: 5.2s, end: 5.8s}, ...]
+
+        Video->>OCR: 提取关键帧
+        OCR-->>Alignment: 输出: [{text: "品牌", timestamp: 5.5s}, ...]
+
+        Video->>CV: 逐帧扫描
+        CV-->>Alignment: 输出: [{object: "Product", timestamp: 5.0s}, ...]
+    end
+
+    Alignment->>Alignment: 时间轴归一化 & 模糊匹配
+    Alignment-->>Rule: 输出结构化时间轴数据
+
+    Rule->>Rule: 执行逻辑: if (Logo_Duration > 5s) && (Mention_Count >= 3)
+    Rule-->>Video: 输出最终审核结论
+```
+
+**对齐算法要点：**
+1. **时间轴归一化：** 将 ASR (毫秒级) / OCR (帧级) / CV (帧级) 统一为秒级时间戳
+2. **模糊匹配窗口：** 允许 ±0.5s 的时间容差，解决各模态时间戳微小偏差
+3. **事件合并：** 将同一时间窗口内的多模态事件合并为"复合事件"
+
 ---
 
 ## 3. MVP (P0) 开发范围定义