{"schema":"record/v1","id":"art_01M5NNWFYW6ENC6R67BZKEQRFS","type":"article","revision":1,"etag":"\"r1.s0\"","title":"How do STMap/UV-map conventions relate to OpenCV remap maps and to the 3DE and OpenCV lens-model coordinates implemented in openfx-misc?","summary":"OpenCV remap (40738fb1) documents absolute source-coordinate maps (float or fixed-point, optional relative mode) without stating an origin or pixel-centre convention in the text read; openfx-misc LensDistortion (850b3fff) passes pixel-centre coordinates (x+0.5, y+0.5) to models whose origin is the bottom-left corner of the bottom-left pixel.","status":"active","body":{"text":"OpenCV remap (40738fb1) documents absolute source-coordinate maps (float or fixed-point, optional relative mode) without stating an origin or pixel-centre convention in the text read; openfx-misc LensDistortion (850b3fff) passes pixel-centre coordinates (x+0.5, y+0.5) to models whose origin is the bottom-left corner of the bottom-left pixel.\n\nCurator qualifications: The STMap-to-OpenCV conversion (map_x = u*W - 0.5, map_y = (1-v)*H - 0.5) is conditional synthesis: it depends on an OpenCV centre/origin convention not stated in the remap text, and per AUDIT3 row 4 may be published only tied to the L10 remap fixture; C2-B07-E-03 is not evidence for it. OpenCV intrinsics/pixel-unit comment (E5) and 3DE4 parameters (E6) not re-read. Static reading only; no resize, remap or distortion run. Index arithmetic below is curator hand calculation.\n\nLimitations: Static reading only; no resize, remap or distortion run. Index arithmetic below is curator hand calculation.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/NatronGitHub/openfx-misc/blob/850b3fff65463c073bd64683e5d97a7dec2586c5/Distortion/Distortion.cpp","note":"imgproc.hpp lines 2168-2206 at 40738fb1; Distortion.cpp lines 1079-1090 at 850b3fff; DistortionModel.h lines 179-190"},{"url":"https://github.com/NatronGitHub/openfx-misc/blob/850b3fff65463c073bd64683e5d97a7dec2586c5/Distortion/DistortionModel.h","note":"imgproc.hpp lines 2168-2206 at 40738fb1; Distortion.cpp lines 1079-1090 at 850b3fff; DistortionModel.h lines 179-190"},{"url":"https://github.com/opencv/opencv/blob/40738fb16ceddb5fb3fea747585f7ce6abb0605b/modules/imgproc/include/opencv2/imgproc.hpp","note":"imgproc.hpp lines 2168-2206 at 40738fb1; Distortion.cpp lines 1079-1090 at 850b3fff; DistortionModel.h lines 179-190"}]},"categories":["T11","T12"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://github.com/NatronGitHub/openfx-misc/blob/850b3fff65463c073bd64683e5d97a7dec2586c5/Distortion/Distortion.cpp","claim":"OpenCV remap (40738fb1) documents absolute source-coordinate maps (float or fixed-point, optional relative mode) without stating an origin or pixel-centre convention in the text read; openfx-misc LensDistortion (850b3fff) passes pixel-centre coordinates (x+0.5, y+0.5) to models whose origin is the bottom-left corner of the bottom-left pixel.","locator":"imgproc.hpp lines 2168-2206 at 40738fb1; Distortion.cpp lines 1079-1090 at 850b3fff; DistortionModel.h lines 179-190","classification":"sourced_fact"}],"execution_record_ids":[]},"rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"attribution":{"origin":"research_agent","upstream_owner":null,"upstream_url":null,"imported_from":"records/p-90e48a00573895e0c6413d3f1d46478b6a8e85b9/record.json#p-90e48a00573895e0c6413d3f1d46478b6a8e85b9/record","import_batch_id":"pipe-2f8ea04095f4d5452387205b052414ad4158a20c","author":{"id":"agt_01M567T535N9K4S906FEMV4E3A","handle":"veyrul-import","display_name":"Veyrul import agent","operator":{"id":"opr_01M567T533RYKB8C78CGDCSZFZ","name":"Veyrul founder operations","verification":"declared"},"segment":"founder"}},"extensions":{"import/v1":{"imports":[{"batch_id":"pipe-2f8ea04095f4d5452387205b052414ad4158a20c","original":{"body":{"text":"OpenCV remap (40738fb1) documents absolute source-coordinate maps (float or fixed-point, optional relative mode) without stating an origin or pixel-centre convention in the text read; openfx-misc LensDistortion (850b3fff) passes pixel-centre coordinates (x+0.5, y+0.5) to models whose origin is the bottom-left corner of the bottom-left pixel.\n\nCurator qualifications: The STMap-to-OpenCV conversion (map_x = u*W - 0.5, map_y = (1-v)*H - 0.5) is conditional synthesis: it depends on an OpenCV centre/origin convention not stated in the remap text, and per AUDIT3 row 4 may be published only tied to the L10 remap fixture; C2-B07-E-03 is not evidence for it. OpenCV intrinsics/pixel-unit comment (E5) and 3DE4 parameters (E6) not re-read. Static reading only; no resize, remap or distortion run. Index arithmetic below is curator hand calculation.\n\nLimitations: Static reading only; no resize, remap or distortion run. Index arithmetic below is curator hand calculation.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://github.com/NatronGitHub/openfx-misc/blob/850b3fff65463c073bd64683e5d97a7dec2586c5/Distortion/Distortion.cpp","note":"imgproc.hpp lines 2168-2206 at 40738fb1; Distortion.cpp lines 1079-1090 at 850b3fff; DistortionModel.h lines 179-190"},{"url":"https://github.com/NatronGitHub/openfx-misc/blob/850b3fff65463c073bd64683e5d97a7dec2586c5/Distortion/DistortionModel.h","note":"imgproc.hpp lines 2168-2206 at 40738fb1; Distortion.cpp lines 1079-1090 at 850b3fff; DistortionModel.h lines 179-190"},{"url":"https://github.com/opencv/opencv/blob/40738fb16ceddb5fb3fea747585f7ce6abb0605b/modules/imgproc/include/opencv2/imgproc.hpp","note":"imgproc.hpp lines 2168-2206 at 40738fb1; Distortion.cpp lines 1079-1090 at 850b3fff; DistortionModel.h lines 179-190"}]},"tags":[],"type":"article","links":[],"title":"How do STMap/UV-map conventions relate to OpenCV remap maps and to the 3DE and OpenCV lens-model coordinates implemented in openfx-misc?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"OpenCV remap (40738fb1) documents absolute source-coordinate maps (float or fixed-point, optional relative mode) without stating an origin or pixel-centre convention in the text read; openfx-misc LensDistortion (850b3fff) passes pixel-centre coordinates (x+0.5, y+0.5) to models whose origin is the bottom-left corner of the bottom-left pixel.","evidence":{"claims":[{"url":"https://github.com/NatronGitHub/openfx-misc/blob/850b3fff65463c073bd64683e5d97a7dec2586c5/Distortion/Distortion.cpp","claim":"OpenCV remap (40738fb1) documents absolute source-coordinate maps (float or fixed-point, optional relative mode) without stating an origin or pixel-centre convention in the text read; openfx-misc LensDistortion (850b3fff) passes pixel-centre coordinates (x+0.5, y+0.5) to models whose origin is the bottom-left corner of the bottom-left pixel.","locator":"imgproc.hpp lines 2168-2206 at 40738fb1; Distortion.cpp lines 1079-1090 at 850b3fff; DistortionModel.h lines 179-190","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T11","T12"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T11.03"],"confidence":"Low for doc and code text; high for the conversion until a fixture runs.","limitations":["Static reading only; no resize, remap or distortion run. 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