73 lines
3.8 KiB
Markdown
73 lines
3.8 KiB
Markdown
# MAG160C 逆向交接文档 v4(2026-08-12 深夜)
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> **最新快照。** 前版:handoff_20260812.md(白天)。
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> 本轮完成:官方 NUC/参考帧机制完整逆向 + demo3 修复(颗粒感/FFC 变色)。
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## 1. 本轮成果
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1. **完整逆向官方帧处理链(Windows CoreSDKLib.dll)**:
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```
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USB帧 → 帧计数分支(0x18000a0xx):
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帧1-5: 0x18000c760(校正表生成, 无显示)
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帧6-9: 0x18000c620(推帧0x41ee0平滑器→生成ref) + 0x18000c760
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帧==9: 发送FFC(0x6bb6b672,1)
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帧10+: 0x18000ca30(主处理)
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→ 0x18000c950: 0x41f10平滑器(模式1: 首帧拷贝+EMA1/2) → f20缓冲(0x41f20)
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→ 0x180017200(NUC查表: d=(f20-ref)>>1, 阈值表*(0x41858), 增益表*(0x41870),
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out=gain×d>>12+off, shift=0x11c=12) → dev+0x270
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→ 0x180017330(3x3加权, 表驱动) → dev+0x270
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→ 0x18001e920(0x41f40平滑) → 0x180010780(温度) → 0x1800109c0(窗口) → 放大
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```
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2. **参考帧机制(决定性)**:
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- ref(0x41ef0) = 平滑器0x41ee0(模式4)输出 = 启动时~22帧累加>>2(≈5.4×帧均值)
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- 只在启动(帧6-9)与FFC时更新;**正常流中不更新**(帧10+不推帧0x41ee0)
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- FFC后ref仅全局偏移变化(-145/-214),空间结构保持
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- **官方ref含启动场景,不吸收后续场景 → 物体显示正常、无鬼影**
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3. **表机制**:
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- 0x41848/0x41850 = 端点表1, 0x41858 = 插值输出(阈值表, 3项s16全局)
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- 0x41860/0x41868 = 端点表2, 0x41870 = 插值输出(增益表 nsegs×19200×(gain,off))
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- 0x180016dd0/0x180016f10 = 分段线性插值(按dev+0x54温度在断点0x41564间插值)
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- 0x180016ae0 = 端点表初始化(帧0, 从配置0x417xx加载)
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- nsegs=0x41554=3, 端点索引0x41840, 断点0x41564/0x41568
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4. **demo3 修复(用户反馈: 颗粒感+FFC变色)**:
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- **斜率 3 → 0.41**(官方量级: 物体100 counts → nuc 41; 之前3倍放大27倍噪声)
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- **FFC后不重采集ref**(REF_REINIT_AFTER_FFC=0, 只rebase全局偏移) —
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重采集会吸收场景使物体消失/FFC后画面错
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- 3x3双向滤波(live与ref同滤波, mura匹配)
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- 像素偏移+0修正, 启动延迟采集, 采集期间冻结显示
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- **实测: temporal gray std 54→22, FFC前后gray均值恒定(74.5), 无颜色跳变**
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## 2. 关键实测数据(pairs_nuc2)
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| 量 | 值 |
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|---|---|
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| nuc(0x270) | mean~9706 std~41 时域噪声13.7 |
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| f20(0x41f20) | ~10855±3639(≈USB帧, 含mura) |
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| ref(0x41ef0) | ~14654±3656(=f20+3875, mura同源corr0.998) |
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| d2=(f20-ref)>>1 | std~114, 与nuc相关仅0.04(坐标/语义错位, 未完全解密) |
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| 增益表seg1 | gain均值3352(≈0.82×4096), off≈9660(≈nuc) |
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| 平滑器模式 | 0x41fd8=4(0x41ee0), 0x41fdc=1(0x41f10), 0x41fe0=1, 0x41fe4=5 |
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| 帧流参数 | 2d78=4 2d88=5 2d8c=4 2d90=1800 2d94=250 |
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## 3. demo3 当前状态
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- 编译: build-artifacts/mag160c_demo3.exe
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- 管线: counts →(3x3+坏点)→ nuc=(live-ref)×0.41+9804 → 窗口[mean±312] →
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LUT1024 → palette256 → 2x显示
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- ref: 启动nread>=130后45帧中值采集; FFC后只rebase全局偏移(不重采集)
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- 诊断: demo3_diag.txt(每帧 ref/live/nuc/窗口统计), demo3_auto_*.bmp(自动截图)
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## 4. 未完成/待验证
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- [ ] 官方nuc与(f20-ref)的精确映射(相关0.04, 表机制复杂未完全解码)
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- [ ] demo3斜率0.41的实机画面确认(对比度/颜色方向)
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- [ ] 0x180016ae0端点表初始化(0x417xx配置/DDT加载)
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- [ ] FFC状态机(0x73bf4, 帧号75/130)
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- [ ] ThermalSDK.dll完整逆向
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- [ ] 启动黑屏~9秒可优化(更早采集或显示预热画面)
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- [ ] 热源场景验证(确认颜色方向: 热=白/红)
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## 5. 环境
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- 设备: Get-PnpDevice | ? InstanceId -match 833C
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- harness: build-artifacts/tsdk_pair2.exe <dir> <npairs> <delay> [边界参数]
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- 官方SDK: IR_Camera_SDK-1.0.1/windows/windows/app/
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- 反汇编: analysis/disasm/coresdk_windows_disasm.txt(193k行, UTF-16)
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- Python: numpy/scipy/PIL
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