Skew (fax)

In fax systems, skew is the angular deviation of the received frame from rectangularity caused by asynchronism between the scanner and the recorder. This is the same as the angle between the scanning line, or recording line, and the perpendicular to the paper path.^[1]

Example of +1 degree (counter-clockwise) skew in a facsimile image. The red line is perfectly horizontal.

Skew is expressed numerically as the tangent^{[broken anchor]} of the deviation angle.

Skew detection^[2] and correction can be automatically applied by the receiving machine.

References

^ This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 22 January 2022. (in support of MIL-STD-188).
^ J. J. Hull (1998). "Document Image Skew Detection: Survey and Annotated Bibliography" (PDF). Document Analysis Systems II. Series in Machine Perception and Artificial Intelligence. 29. J. J. Hull, S. L. Taylor (editors). World Scientific: 40–64. doi:10.1142/9789812797704_0003. ISBN 978-981-02-3103-3. S2CID 5219931. Archived from the original (PDF) on 20 July 2019. Retrieved 21 July 2019.

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[1] This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 22 January 2022. (in support of MIL-STD-188).

[2] J. J. Hull (1998). "Document Image Skew Detection: Survey and Annotated Bibliography" (PDF). Document Analysis Systems II. Series in Machine Perception and Artificial Intelligence. 29. J. J. Hull, S. L. Taylor (editors). World Scientific: 40–64. doi:10.1142/9789812797704_0003. ISBN 978-981-02-3103-3. S2CID 5219931. Archived from the original (PDF) on 20 July 2019. Retrieved 21 July 2019.

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