Validating the use of Handwriting as a Biometric and it’s Forensic Analysis
Handwriting analysis ASISTM Project Forensic Investigations.
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Transcript of Handwriting analysis ASISTM Project Forensic Investigations.
![Page 1: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/1.jpg)
Handwriting analysis
ASISTM ProjectForensic Investigations
![Page 2: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/2.jpg)
Characteristics
Handwriting experts look at 12 characteristics of a person’s writing.
They try and compare a sample of the suspect’s writing to a known original.
![Page 3: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/3.jpg)
On first glance the forgery is quite a good copy.
Original
Forgery
![Page 4: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/4.jpg)
Lets take a closer look!
![Page 5: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/5.jpg)
Line quality
Are the lines smooth or shaky?
Original
Forgery
![Page 6: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/6.jpg)
Spacing - words and letters
Is the spacing size consistent?
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Ratio - height, width, size
Original
Forgery
Are the letters consistent in shape & size?
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Pen lifts and separation
Are the pen lifts consistent?
Original
Forgery
![Page 9: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/9.jpg)
Connecting strokes
Compare how letters are linked.
Original
Forgery
![Page 10: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/10.jpg)
Beginning and ending strokes
Are the strokes straight, curled, long?
Original
Forgery
![Page 11: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/11.jpg)
Unusual letter formation
Unusual letters - letters written backwards, tails
Original Forgery
![Page 12: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/12.jpg)
Shading or pen pressure
Differences in shading = differences in pen pressure
Original
Forgery
![Page 13: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/13.jpg)
Slant
Is the slant or angle of the letters consistent?
Original
Forgery
![Page 14: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/14.jpg)
Baseline habits
Does the writing go below the line?
There is a tendency for the top author (original) to write above the line while the forgery tends to be on the line.
Original
Forgery
![Page 15: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/15.jpg)
Flourishes and embellishments
Any fancy letters?
Original
Forgery
![Page 16: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/16.jpg)
Diacritic placement - cross i, dot t
Is the line on the “t” in proportion? Are the “i’s” dotted left or right?
Original
Forgery
The i dot and t cross tend to the right of the letter.
The i dot is varied. The t cross is even. The form of the lettert is wider at the base.
![Page 17: Handwriting analysis ASISTM Project Forensic Investigations.](https://reader033.fdocuments.in/reader033/viewer/2022061318/56649e565503460f94b4ed5a/html5/thumbnails/17.jpg)
References
Deslich, B & Funkhouser, J. 2005 Forensic Science for High School. Kendall/Hunt Publishing Company, US
Writing samples from J Dook & T. Hutchison, scanned into Adobe Photoshopat 400dpi.
Graphic design for slides by T. Hutchison, DUIT Multimedia, UWA