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[Refactor] Camera Pose 좌표계 및 Capture Projection 재검증 - #88

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Sep 27, 2026
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@lioba00700 lioba00700 commented Sep 27, 2026 •

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🎯 작업 내용

Issue #47의 DWPose target 좌표와 MediaPipe live 좌표가 동일한 Capture 좌표계로 투영되는 흐름을 재검증하고, Camera session 단위의 projection 계약을 명시했습니다.

기존 좌표 변환 수식은 유지하면서 capture 크기, cover crop 모델, 전면/후면 Camera mirror 정책을 PoseProjectionContext로 모았습니다. Target과 Live pose가 같은 context를 사용하도록 연결하고 Capture Matching과 Preview Rendering의 책임 경계를 문서화했습니다.

🔍 기존 문제

Target과 Live pose가 각각 captureSize, cover, mirror 옵션을 구성해 동일한 Capture 좌표 계약을 사용한다는 사실이 구조상 드러나지 않았습니다.

Camera output의 mirror 정책도 VisionCamera의 auto 동작에 의존하고 있어 플랫폼별 기본값을 코드에서 명확히 확인하기 어려웠습니다. 특히 final PhotoOutput의 mirror 정책과 Frame input에서 필요한 상대 반전의 책임이 서로 다른데, 이를 설명하는 session 단위 계약이 없었습니다.

또한 FrameOutput 16:9와 PhotoOutput 4:3/16:9 사이의 crop 모델이 여러 호출부에 문자열 옵션으로 흩어져 있어 향후 native crop rect 기반 구현으로 교체할 경계가 불명확했습니다.

✅ 주요 변경 사항

Camera Mirror 정책 명시

  • Camera position 타입을 front | back 계약으로 분리
  • front Camera는 mirrorMode="on", back Camera는 mirrorMode="off"로 명시
  • 최종 capture mirror 정책을 CameraRuntimeGeometry.captureMirrorX로 전달
  • Camera geometry 비교 시 mirror 정책 변경도 반영
  • VisionCamera Frame.isMirrored의 output-relative 값을 live→capture 상대 반전에 사용

Capture Projection Context 도입

  • capture 크기, crop 모델, capture mirror 정책을 PoseProjectionContext가 소유
  • DWPose target용 createTargetPoseProjectionTransform 추가
  • MediaPipe live용 createLivePoseProjectionTransform 추가
  • Guide controller가 session context를 생성하고 target/live projector가 공유하도록 연결
  • MediaPipe의 upright input은 추가 회전하지 않고 Frame metadata의 상대 mirror만 적용

좌표 책임 경계 정리

  • Source / MediaPipe Input → Capture 변환은 Pose Matching domain이 담당
  • Capture → Preview 변환은 UI rendering 경계로 유지
  • 4:3/16:9 차이는 공통 center-cover 모델을 통해 Capture 좌표로 정규화
  • 향후 native crop rect adapter가 추가되어도 DWPose/MediaPipe adapter를 변경하지 않도록 교체 경계 유지

테스트 및 문서화

  • 전면/후면 Camera mirror mode 정책 테스트 추가
  • Target/Live projector가 동일한 Capture contract를 사용하는 테스트 추가
  • 기존 4:3/16:9 cover crop, orientation, mirror, Preview 경계 테스트 유지
  • ADR-0004에 session projection context와 mirror 책임, 현재 crop 모델의 제약 기록

🧪 확인 사항

  • DWPose / MediaPipe 좌표 기준 확인
  • Capture 좌표계 변환 과정 검증
  • Cover Crop 및 4:3 / 16:9 비율 변환 로직 확인
  • Orientation / Front Camera Mirror 처리 검증
  • Preview와 Matching 좌표 책임 경계 검토
  • 구조적 문제 및 리팩토링 범위 반영
  • Pose Matching 테스트 30개 통과
  • Camera 설정 테스트 11개 통과
  • Pose Detection 테스트 5개 통과
  • TypeScript 검사 통과
  • ESLint 오류 0개
  • Steiger FSD 검사 통과
  • Expo iOS / Android production export 통과
  • 관련 Architecture / ADR 문서 갱신
  • 실제 기기에서 4:3 / 16:9 PhotoOutput과 FrameOutput의 FOV 비교

📌 참고 사항

현재 ProjectionContext의 crop 모델은 center-cover입니다. native crop rect가 제공되지 않는 현재 구조에서 사용하는 명시적인 근사 모델이며, 실제 기기 FOV 측정 결과에 따라 향후 native crop metadata adapter로 교체할 수 있습니다.

Camera의 최종 mirror 정책과 Frame input의 상대 mirror는 별도 책임입니다. Camera 경계는 front/back output 정책을 결정하고, Pose projection은 VisionCamera가 제공하는 output-relative Frame.isMirrored만 적용합니다.

실제 기기 FOV 검증은 이번 구조 재검증과 분리했으며, 현재 로컬 작업트리에 남아 있는 Issue #48 및 기존 문서 변경은 이 PR에 포함하지 않았습니다.

🟢 관련 이슈

Closes #47

Summary by CodeRabbit

  • Improvements
    • Front-camera captures and previews now use mirrored output, while back-camera output remains unmirrored.
    • Pose matching now accounts for camera mirroring and image cropping, helping keep live poses aligned with guide poses.
    • Existing input mirroring is detected to avoid applying the mirror effect twice.

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Review in Change Stack →

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

📝 Walkthrough

Walkthrough

Camera mirror modes now follow camera position and flow through runtime geometry. Pose matching uses a shared projection context for target and live poses, with live mirroring derived from frame metadata.

Changes

Camera Mirror and Pose Projection

Layer / File(s) Summary
Camera mirror policy and geometry
src/features/camera/capture-photo/model/models.ts, src/features/camera/capture-photo/lib/camera-capture-settings.ts, src/features/camera/capture-photo/ui/camera.tsx, src/features/camera/capture-photo/__tests__/camera-capture-settings.test.cjs, src/features/camera/guide-feed/model/types.ts, src/widgets/camera/capture-workspace/ui/camera-capture-workspace.tsx
Front cameras resolve to mirror mode on; back cameras resolve to off. Runtime and guide geometry include the capture mirror setting. Geometry equality checks include that setting, and tests cover the front/back mapping.
Shared pose projection context
src/features/camera/guide-feed/lib/pose-matching/types.ts, src/features/camera/guide-feed/lib/pose-matching/coordinate-transform.ts, src/features/camera/guide-feed/lib/pose-matching/live-pose-frame.ts, src/features/camera/guide-feed/model/use-camera-guide-controller.ts, src/features/camera/guide-feed/lib/pose-matching/__tests__/pose-matching.test.cjs, docs/architecture/adr-0004-pose-matching-domain.md
Target and live pose transforms use a context containing capture size, the center-cover crop model, and capture mirror policy. Live-pose mirroring uses frame metadata to determine the relative mirror setting. Tests cover the context and transforms; the ADR records the model and updated validation results.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Refactor

Merge Risk: 🔵 Low · up to 1e939

Front-camera pose matching can reflect live poses incorrectly relative to captured photos. Correct the relative mirror calculation before relying on the new projection policy; the evidence does not establish a broader regression.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 1e939

The camera and pose-projection changes warrant design review, but the reviewed paths do not show a new permission bypass or a change to who can capture or transmit media. Device-specific mirror behavior remains to be validated.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

  • inferred — The changed policy can affect mirrored camera output and pose-guidance coordinates within an active camera session. The inspected handoff does not make projected pose results an authority for photo capture or RTC transmission.

Trust Boundaries and Controls

  • observed — The permission check stays at the camera component boundary, and the live-pose transform consumes frame mirror metadata separately from the configured capture-mirror policy.

Resilience and Maintainability Implications

  • inferred — A detector callback arriving across a camera restart could use the current matching context because the inspected callback carries no camera-session identity. Its observed consumer updates alignment rather than authorizing photo capture or media transmission; native in-flight callback behavior remains unknown.
🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 11 files. (1 skipped:… Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly describes the main change: refactoring and revalidating the camera pose coordinate system and capture projection.
Linked Issues check ✅ Passed The PR addresses the coding objectives in issue #47. It creates a shared PoseProjectionContext for capture size, center-cover cropping, and capture mirror policy. It connects DWPose target and Media…
Out of Scope Changes check ✅ Passed The changed camera settings, camera models and UI, pose projection types and transforms, live-pose preparation, controller, workspace comparison, tests, and ADR documentation all support issue #47. Th…
Full details: Docstring Coverage

Explanation

Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 11 files. (1 skipped: 1 unsupported.)

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src/features/camera/capture-photo/ui/camera.tsx

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ESLint: 9.39.5

Error: File 'expo/tsconfig.base' not found.
Occurred while linting /src/features/camera/capture-photo/ui/camera.tsx:1
Rule: "import/namespace"
at resolveExtends (/.eslint-tmp/node_modules/.pnpm/get-tsconfig@4.14.3/node_modules/get-tsconfig/dist/index.cjs:7:7283)
at _parseTsconfig (/.eslint-tmp/node_modules/.pnpm/get-tsconfig@4.14.3/node_modules/get-tsconfig/dist/index.cjs:7:8467)
at parseTsconfig (/.eslint-tmp/node_modules/.pnpm/get-tsconfig@4.14.3/node_modules/get-tsconfig/dist/index.cjs:7:13444)
at Object.getTsconfig (/.eslint-tmp/node_modules/.pnpm/get-tsconfig@4.14.3/node_modules/get-tsconfig/dist/index.cjs:7:17072)
at /.eslint-tmp/node_modules/.pnpm/eslint-import-resolver-typescript@3.10.1_eslint-plugin-import@2.32.0_eslint@9.39.5_supp_7ca22ac1bf8c0314ae197f8b66b5f455/node_modules/eslint-import-resolver-typescript/lib/index.cjs:314:36
at Array.map ()
at initMappers (/.eslint-tmp/node_modules/.p

... [truncated 5607 characters] ...

color@8.1.1/node_modules/eslint/lib/linter/linter.js:2203:43)
at Linter._verifyWithFlatConfigArray (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_supports-color@8.1.1/node_modules/eslint/lib/linter/linter.js:2306:15)
at Linter.verify (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_supports-color@8.1.1/node_modules/eslint/lib/linter/linter.js:1677:10)
at Linter.verifyAndFix (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_supports-color@8.1.1/node_modules/eslint/lib/linter/linter.js:2571:20)
at verifyText (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_supports-color@8.1.1/node_modules/eslint/lib/eslint/eslint-helpers.js:1180:45)
at readAndVerifyFile (/.eslint-tmp/node_modules/.pnpm/eslint@9.39.5_supports-color@8.1.1/node_modules/eslint/lib/eslint/eslint-helpers.js:1321:10)

src/features/camera/guide-feed/lib/pose-matching/__tests__/pose-matching.test.cjs

ESLint skipped: the matched ESLint configuration already failed (unknown).

src/features/camera/guide-feed/lib/pose-matching/coordinate-transform.ts

ESLint skipped: the matched ESLint configuration already failed (unknown).

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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @src/features/camera/guide-feed/lib/pose-matching/live-pose-frame.ts:
- Around line 17-25: Update the mirror-state argument passed to
createLivePoseProjectionTransform in the live pose mapping so it reflects the
relative state between frame.sourceFrame.isMirrored and
projectionContext.captureMirrorX. Preserve the existing projection flow while
ensuring the transform receives whether those mirror states differ.

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📒 Files selected for processing (12)
  • docs/architecture/adr-0004-pose-matching-domain.md
  • src/features/camera/capture-photo/__tests__/camera-capture-settings.test.cjs
  • src/features/camera/capture-photo/lib/camera-capture-settings.ts
  • src/features/camera/capture-photo/model/models.ts
  • src/features/camera/capture-photo/ui/camera.tsx
  • src/features/camera/guide-feed/lib/pose-matching/__tests__/pose-matching.test.cjs
  • src/features/camera/guide-feed/lib/pose-matching/coordinate-transform.ts
  • src/features/camera/guide-feed/lib/pose-matching/live-pose-frame.ts
  • src/features/camera/guide-feed/lib/pose-matching/types.ts
  • src/features/camera/guide-feed/model/types.ts
  • src/features/camera/guide-feed/model/use-camera-guide-controller.ts
  • src/widgets/camera/capture-workspace/ui/camera-capture-workspace.tsx

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Comment thread src/features/camera/guide-feed/lib/pose-matching/live-pose-frame.ts
@lioba00700
lioba00700 merged commit c21301f into dev Sep 27, 2026
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[Refactor] Camera Pose 좌표계 및 Capture Projection 재검증

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