Pixel is a single picture element of the image. It never corresponds to the physical pixel on the camera sensor. The size of the pixel depends on the image (and the camera) aspect ratio (the ratio between the image width and length).
Image Feature Extraction
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(2009). Pixel. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_758
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DOI: https://doi.org/10.1007/978-0-387-73003-5_758
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