Slant (handwriting)
Encyclopedia
Slant is the predominant angle of the downward stroke
Downward stroke
Downward stroke can mean:* In handwriting, a downward stroke or downstroke is a ballistic stroke having a direction toward the feet and/or torso of the person....

 in Western handwriting. A good basis for its estimation is the point of the handwritten curve where the velocity has its peak value in the
downward stroke. The polar distribution
Polar distribution
In probability and statistics, a circular distribution or polar distribution is a probability distribution of a random variable whose values are angles, usually taken to be in the range...

 of the running angle
Running angle
In graphonomics, the running angle is the angle of consecutive vectors with respect to the base line, i.e.Usually, it is more informative to compute it using a four-quadrant version of the arctan function in a mathematical software library....

 along a handwritten trajectory is another good method for estimating the slant angle. Left-handed writing is often accompanied by a slant value which is larger than 90 degrees, i.e., it is bent backwards, to the left.

In Graphology
Graphology
Graphology is the pseudoscientific study and analysis of handwriting, especially in relation to human psychology. In the medical field, it can be used to refer to the study of handwriting as an aid in diagnosis and tracking of diseases of the brain and nervous system...

 slant can refer to either upstroke or downstroke values. These strokes can made in the upper, middle, lower, or any combination of those zones.

In handwriting recognition
Handwriting recognition
Handwriting recognition is the ability of a computer to receive and interpret intelligible handwritten input from sources such as paper documents, photographs, touch-screens and other devices. The image of the written text may be sensed "off line" from a piece of paper by optical scanning or...

, an affine transformation
Affine transformation
In geometry, an affine transformation or affine map or an affinity is a transformation which preserves straight lines. It is the most general class of transformations with this property...

can be used to normalize handwritten input towards a population average or towards 90 degrees.
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