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wai-rs: jpegai_pipeline::dequant + e2e integration (entropy→dequant byte-exact) #3

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dcharlot merged 1 commit from feat/jpegai-pipeline-dequant into main 2026-07-08 07:14:27 -04:00
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dcharlot commented 2026-07-08 07:14:26 -04:00
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Starts the JPEG-AI decode-pipeline glue. dequant = y_q · gain_map (RVS folded into the per-position map). Proves entropy→dequant BYTE-EXACT (max|Δ|=0) on the real test256.bin y-latent, and validates the full synthesis stage on the real reference latent (Y 58.85 dB, UV 58.88 dB; UV input = concat(y_lsbs,uv_lsbs)).

Starts the JPEG-AI decode-pipeline glue. dequant = y_q · gain_map (RVS folded into the per-position map). Proves entropy→dequant BYTE-EXACT (max|Δ|=0) on the real test256.bin y-latent, and validates the full synthesis stage on the real reference latent (Y 58.85 dB, UV 58.88 dB; UV input = concat(y_lsbs,uv_lsbs)).
Start the JPEG-AI decode-pipeline glue that wires the byte-exact stages together.

- jpegai_pipeline::dequant — resi[c,p] = y_q[c,p] · gain_map[c,p], where the
  per-position gain map already folds the per-channel gain (scaler_vec) and the
  residual-variance scale (RVS). Deterministic f32.
- e2e entropy→dequant: decode the real test256.bin y-latent (40960 symbols) with
  the mANS decoder, dequantize, and match the reference resi_dq_y checkpoint —
  BYTE-EXACT (max|Δ| = 0). Proves the mANS output IS the dequant input.
- e2e synthesis on the real reference latent: decode_y(y_lsbs)→ypix at 58.85 dB and
  decode_uv(concat(y_lsbs,uv_lsbs))→uvpix at 58.88 dB — the full synthesis stage
  validated on real pipeline data, and the UV input assembly (y‖uv) pinned.

All feature-gated on the checkpoint/fixtures. Builds toward decode(bitstream)→pixels.

Co-Authored-By: Claude Opus 4.8 <[email protected]>
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