nx_deblock.nx

nx_deblock.nx -- in-loop deblocking filter for 8x8 block-grid reconstructions. Substrate primitive that smooths the quantisation discontinuities at block boundaries without touching real edges. Algorithm (simple, public): for each boundary (horizontal between rows 7-8, 15-16, ...; vertical between cols 7-8, 15-16, ...) take the four pixels straddling the line: p1, p0 | q0, q1 If the local variation is small (|p1-p0| < T && |q0-q1| < T && |p0-q0| < T2), apply a low-pass filter that pulls p0 and q0 toward the average across the boundary. Otherwise leave the pixels alone (preserves real edges). This is structurally what H.263 Annex J and H.264's deblocking filter do; the simple variant here re-derives from the underlying public idea (filter only smooth regions) without copying their boundary-strength tables or per-block-mode dispatch. Quality is modest; the row goes from LOSE to WIN on the substrate axis once the feature exists. Stronger variants are named improvements. genealogy_id: itu_t_h_263_annex_j + h264_8_7_deblock + jpeg2000_visual + nx_video_codec_v1_q10 lineage_id: nishi_deblock_q10