17-EFT.WP.Methods.Imaging v1.0 | Preface

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Preface

One-Sentence Goal
Define this volume’s position and deliverables within the EFT system; profile its readers; state the core interfaces and cross-volume dependencies; and formalize the quality gates and audit requirements for a “publishable image.”

I. Purpose & Audience

1. Scope
   • End-to-end imaging chain from sensing to publication: schema binding → radiometric/metrological consistency → optics & sampling → noise & correction → geometry & color → HDR & computational imaging → time/path gating & two-form T_arr → quality & compliance → release freeze.
   • Unified numbering: axioms P20x-*, minimal equations S20x-*, imaging processes M20-*, implementation bindings I20-*. Cross-volume citations use the fixed format: “see EFT.WP.Core. v1.x*, Chapter x, S/P/M/I…*”.
2. Readers & roles
   • Algorithm engineers, system & on-device integrators, quality/metrology teams, and operations/auditors.
   • Outputs target both offline batch pipelines and online/streaming execution environments (Threads).
3. Key objects & notation (used throughout this volume)
   • Imaging & frequency domain: I(x,y,t), h(x,y), H_otf(nu_x,nu_y), MTF(nu), F{•} is the 2-D Fourier operator.
   • Radiometry & color: L(x,omega,λ,t), E, H, S_sensor(λ), QE(λ); color bases and white point are explicit.
   • Sampling & noise: Δx, Δt, bpp, gain, σ_shot, σ_read.
   • Time & path: ts, tau_mono, gamma(ell), T_arr; two forms
     T_arr = ( 1 / c_ref ) * ( ∫ n_eff d ell ) and T_arr = ( ∫ ( n_eff / c_ref ) d ell ), with delta_form recorded.
   • Reserved name conflicts (strict): T_fil (tension) vs T_trans (transmission coefficient) must not be conflated; distinguish n from n_eff.
   • Formulas/symbols: English/Greek only; no Chinese. Every integral must explicitly state its domain and measure.

II. Cross-References

1. Data schema & manifests
   • Schema, primary keys, quality, and manifest fields: see EFT.WP.Core.DataSpec v1.0 (corresponding S/M/I sections).
   • Acquisition chain & device metadata: see EFT.WP.Core.Sea v1.0; exposure, shutter, and ToF gating share M processes.
2. Execution & streaming
   Streaming scheduling, backpressure, and idempotence: see EFT.WP.Core.Threads v1.0; the I20-* operators in this volume can be encapsulated as thr/chan nodes.
3. Energy & spectral density
   Energy conservation, spectral density, and metrology: see EFT.WP.Core.Density v1.0; PSF/OTF/MTF and spectral measures are aligned herein.
4. Equations & parameters
   Convolution/Fourier, metrology, and constants: see EFT.WP.Core.Equations v1.1 and EFT.WP.Core.Parameters v1.0; unit/dimension checks and uncertainty propagation align with Methods.Cleaning appendices.

III. Factory-Exit Conditions (Quality Gates & Audit)

1. Unified release criterion
   • pass_imaging = contract_ok ∧ check_dim ∧ arrival_forms ∧ quality_ok ∧ manifest_signed.
   • Where:
     1. check_dim: all formulas satisfy check_dim( y - f(x) ) = true;
     2. arrival_forms: delta_form ≤ tol_Tarr, both forms computed in parallel and persisted;
     3. quality_ok: imaging quality thresholds are met;
     4. manifest_signed: hash_sha256(blob) and signature match; freeze_release(tag) completed.
2. Quality & compliance modules (minimal set with example thresholds)
   • Schema & metrology: repair_units complete; radiance/illuminance/energy units consistent; all dimensional checks pass.
   • Optics & frequency domain: MTF(nu) meets target (e.g., mtf50 ≥ mtf50_min); PSF normalization ( ∫∫ h dx dy ) = 1.
   • Noise & correction: model σ_total^2 = σ_shot^2 + σ_read^2 + … residuals ≤ threshold; flat-field/dark-frame residuals and PRNU/DSNU drift are controlled.
   • Geometry & registration: intrinsics/extrinsics K,R,t converge; reprojection error ≤ eps_reproj; distortion correction is boundary-consistent.
   • Color & white balance: ΔE ≤ ΔE_max; color space and white point are fully recorded.
   • HDR & fusion: ghosting rate ≤ ghost_max; dynamic range DR ≥ DR_min; saturation mask coverage meets target.
   • Time/path gating: gating/ToF conventions consistent; two-form T_arr gap and U(delta_form) are controlled.
   • Aggregate quality: q_score ∈ [0,1] (aggregate over MTF/SSIM/NIQE/DR/ΔE/delta_form, etc.); require q_score ≥ q_min.
3. Audit & traceability (persistence requirements)
   • manifest.imaging.*: device chain, photometry, geometry, color, quality, arrival-time, and uncertainty keys.
   • contracts.tests: quality assertions with thresholds, pass rates, and failure distributions.
   • release.manifest: version, dependency closure, digest, and signature.
4. Rollback & risk control
   If P99/SLO degrade, contracts fail, or delta_form exceeds bounds, trigger rollback and postmortem, and apply guardrail policy cards.

Summary
This preface establishes that the volume unifies imaging modeling and implementation (P/S/M/I) while enforcing units/dimensions, two-form arrival time, spectral/energy conservation, and quality/compliance gates. With this scaffold, subsequent chapters can implement an end-to-end imaging processing and publication flow that ensures images are measurable, auditable, reproducible, and revertible.