nx_body_measurement_extract.nx

nx_body_measurement_extract.nx -- silhouette + scale -> BodyDimensions. Closes the customer-facing side of the retail-fit pipeline. Customer takes a body photo (or stands in front of any camera); substrate extracts measurable dimensions in millimeters. Pairs directly with nx_garment_fit_match for the substrate-grounded "Small" replacement. PRIVACY NOTE: the substrate runs CLIENT-SIDE. Pixel data + measurements stay on the customer's device. Only the verdict (PERFECT_TAILORED / GOOD_FIT / etc. + recommended SKU rank) ships to the retailer's server. No body-photo upload; no body-measurement leak. This is the privacy-preserving inversion of the typical "send us your measurements" e-commerce flow. CONTRACT (V1): silhouette binary mask (foreground=1, background=0); single channel; same w x h as the original photo reference_px pixels measured for the reference object's long axis (e.g., card_long_axis_pixels) reference_mm the reference's real-world long axis in mm (credit card 85.6mm; A4 paper 297mm; etc.) landmark_y[] caller-supplied landmark row indices: [0] top_of_head (auto-detectable as topmost foreground row) [1] shoulder_y (~ head + 0.13 * height) [2] bust_y (~ head + 0.25 * height) [3] waist_y (~ head + 0.37 * height, OR narrowest-cross- section search range) [4] hip_y (~ head + 0.50 * height) [5] inseam_top_y (groin / crotch) [6] ankle_y (auto-detectable as bottommost foreground row) out *BodyDimensions struct from nx_garment_fit_match Future brick (queued): nx_body_landmark_detect.nx -- given silhouette, emit landmark_y array automatically via anthropometric proportion fitting + edge curvature. Until then, the caller provides them. genealogy_id: iso_8559_1989_body_measure + heine_2012_anthropometry +