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        "description": "The detector uses local image-gradient statistics, a specified window and response/threshold choices. Its geometric interpretation concerns the local model; noise, scale, aperture ambiguity and textured regions can limit detection. It is not a universal object-recognition algorithm or exact projective invariance. Reported image examples have not been independently replayed.",
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      "statement": "# Harris and Stephens: tell corners from edges for visual tracking\n\nA local intensity-change matrix and determinant/trace response distinguish corners from edges without relying on a few sampled shift directions, supporting combined feature extraction.\n\nA camera needs recognizable points to track a scene as it moves. A plain patch changes little when shifted; an edge changes strongly in one direction; a corner changes in several directions. Harris and Stephens summarized these differences in a small matrix and used its determinant and trace to produce a corner response. This corrected direction-sampling and window problems in the earlier Moravec detector and combined corner detection with edge extraction. The matrix description is rotation invariant in its local mathematical model. It is not a guarantee of reliable matching at every scale, viewpoint or lighting condition. The original paper showed natural-scene examples and explicitly left better junction completion and adaptive thresholds for future work. The original image and tracking results have not been independently reproduced here.\n\n## Scientific scope\n\nThe detector uses local image-gradient statistics, a specified window and response/threshold choices. Its geometric interpretation concerns the local model; noise, scale, aperture ambiguity and textured regions can limit detection. It is not a universal object-recognition algorithm or exact projective invariance. Reported image examples have not been independently replayed.\n\n## People and systems\n\nChris Harris; Mike Stephens\n\n\n\n## Original sources\n\n- [Chris Harris and Mike Stephens: A Combined Corner and Edge Detector (1988)](https://www.bmva-archive.org.uk/bmvc/1988/avc-88-023.pdf)\n",
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    "id": "harris-stephens-corner-edge-detector-1988",
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