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]

Skew is expressed numerically as the tangent of the deviation angle.

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

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

References

This article incorporates public domain material from the General Services Administration document: "Federal Standard 1037C". (in support of MIL-STD-188)
J. J. Hull (1998). J. J. Hull, S. L. Taylor (editors). "DOCUMENT IMAGE SKEW DETECTION: SURVEY AND ANNOTATED BIBLIOGRAPHY" (PDF). Document Analysis Systems II. Series in Machine Perception and Artificial Intelligence. World Scientific. 29: 40–64. doi:10.1142/9789812797704_0003. ISBN 978-981-02-3103-3. Retrieved 21 July 2019.

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[1] This article incorporates public domain material from the General Services Administration document: "Federal Standard 1037C". (in support of MIL-STD-188)

[2] J. J. Hull (1998). J. J. Hull, S. L. Taylor (editors). "DOCUMENT IMAGE SKEW DETECTION: SURVEY AND ANNOTATED BIBLIOGRAPHY" (PDF). Document Analysis Systems II. Series in Machine Perception and Artificial Intelligence. World Scientific. 29: 40–64. doi:10.1142/9789812797704_0003. ISBN 978-981-02-3103-3. Retrieved 21 July 2019.