nx_features.nx

buildroot/runtime/nx_features.nx

14813 B443 linesdepth 6pulls 13 transitivereach 21 importersview sourcekind library

docs dependencies structs consts functions

about

nx_features.nx -- pure-math classical computer-vision features. No learned weights, no neural network, no model file. Substrate primitives only. Reuses nx_th_isqrt, nx_th_hamming_distance, nx_th_spectral_disc_2x2 from nx_theorems*.nx. Capabilities at this version: * Harris corner response (structure tensor + spectral discriminant) * Edge magnitude threshold (Sobel + clamp) * Connected components on binary mask (union-find) * Hu invariant moments (rotation/scale/translation invariant shape) * Hamming descriptor matching genealogy_id: harris_stephens_1988 + canny_1986 + hu_1962 + rosenfeld_pfaltz_1966 (connected components) lineage_id: structure_tensor + spectral_discriminant + central_moments axioms: NX_AX_ALG_DISTRIBUTIVITY, NX_AX_ORD_LEAST_UPPER_BOUND

dependencies 5 imports · 8 importers

imports: syscalls.nxnx_axioms.nxnx_i128.nxnx_qed_freek.nxnx_image.nx

imported by: nx_arm_count.nxnx_face_count.nxnx_features_test.nxnx_geom_test.nxnx_multi_body.nxnx_region.nxnx_skin_texture.nxnx_vision_pipeline_test.nx

structs

182	struct CCResult

consts

46	const NX_HARRIS_K_NUM: i64 = 4
47	const NX_HARRIS_K_DEN: i64 = 100
189	const NX_CC_BYTES: i64 = 32

functions

49	func nx_feat_harris_response(gray: Image) -> ImageS64 called by 2: main main calls 6: nx_image_sobel_x nx_image_sobel_y nx_image_s64_alloc nx_image_s64_get nx_muldiv_i64 nx_image_s64_set
96	func nx_feat_corners_nms(resp: ImageS64, threshold: i64) -> Image calls 3: nx_image_alloc nx_image_s64_get nx_image_set
133	func nx_feat_count_corners(mask: *Image) -> i64 calls 1: nx_image_get
153	func nx_feat_edge_mask(gray: Image, threshold: i64) -> Image called by 2: main main calls 6: nx_image_sobel_x nx_image_sobel_y nx_image_gradient_magnitude nx_image_alloc nx_image_s64_get nx_image_set
192	func nx_cc_find(parent: *i64, x: i64) -> i64 called by 2: nx_cc_union nx_feat_connected_components
207	func nx_cc_union(parent: *i64, a: i64, b: i64) -> i64 called by 1: nx_feat_connected_components calls 1: nx_cc_find
214	func nx_feat_connected_components(mask: Image) -> CCResult called by 6: nx_arm_count_compute nx_face_count_compute main nx_multi_body_compute nx_region_segment main calls 3: nx_image_get nx_cc_union nx_cc_find
299	func nx_feat_component_stats(cc: CCResult, out: i64) -> i64 called by 5: nx_arm_count_compute nx_face_count_compute main nx_multi_body_compute nx_region_segment
357	func nx_feat_hu_moments(mask: Image, out_hu: i64) -> i64 called by 1: main calls 2: nx_image_get nx_muldiv_i64
441	func nx_feat_match_brief(desc_a: i64, desc_b: i64) -> i64 called by 2: main main calls 1: nx_th_hamming_distance