A fingerprint can be classified by its pattern (arch, loop, or whorl), and can be further classified by identifying the locations of minutiae within the print. We will classify prints and identify minutiae in this exercise. Finally, we will compare prints to each other. CASE DETAILS Far out! Someone has ruined Peter’s science experiment. During the time of the crime, he was playing ball in the house with Greg and Bobby. The three detectives team up and dust for prints and find 3 on some materials on Peter’s desk (Unknown Prints A, B and C). Prints are collected from the usual suspects - you know, Marcia, Jan, Cindy... and Alice! Who ruined Peter’s science experiment? And why? Part 1: Identifying patterns The files needed for this assignment are listed in the Fingerprints Module. Download and view the word document “JS110,A,FPknownsunknowns”. This document contains scans of 3 unknown prints along with 4 known prints from the “suspects”. Identify the pattern of each print (arch, loop, or whorl) and write the pattern name of each unknown and known print. Example: Alice = whorl, etc. for all 7 prints. Part 2: Comparing known and unknown prints Compare the patterns of each print. See if you can exclude any of the prints based on the pattern. Compare the patterns and attempt to match each unknown to a known. This won’t be easy. Compare the minutiae of the prints. Even though they are small, try to identify some of the ridge endings and bifurcations. This could be difficult. Identify the 3 Unknown Prints. The prints may have come from the same person. For each unknown, write the name of the suspect that you think deposited the print. Example: Unknown A = Alice, etc. Part 3: Confirming identity Pick one known and one unknown that you are confident match. From the files listed in the Fingerprints Module, download both images of the 2 prints you have chosen. Open each image in an imaging software program of your choice. If you are unsure, you can Paint in the accessories menu of windows. Arrange the prints so they are next to each other. It should now be easier to see if they are the same. Using the paint tools, I want you to mark 3 or 4 ridge endings or bifurcations in the unknown print. Now try to find these in the known print. Mark the same ridge endings or bifurcations in the known print. Keep looking at the prints until you are able to mark and match at least 3 ridge endings or bifurcations. Number the ridge endings and bifurcations in each printout so it is obvious which minutia match up. For example, if you label a ridge ending in the unknown as #1, and then also label the same ridge ending in the known print as #1. Save each image and submit each image that you have marked (your selected known and selected unknown).

A fingerprint can be classified by its pattern (arch, loop, or whorl), and can be further classified by identifying the locations of minutiae within the print. We will classify prints and identify minutiae in this exercise. Finally, we will compare prints to each other. CASE DETAILS Far out! Someone has ruined Peter’s science experiment. During the time of the crime, he was playing ball in the house with Greg and Bobby. The three detectives team up and dust for prints and find 3 on some materials on Peter’s desk (Unknown Prints A, B and C). Prints are collected from the usual suspects - you know, Marcia, Jan, Cindy... and Alice! Who ruined Peter’s science experiment? And why? Part 1: Identifying patterns The files needed for this assignment are listed in the Fingerprints Module. Download and view the word document “JS110,A,FPknownsunknowns”. This document contains scans of 3 unknown prints along with 4 known prints from the “suspects”. Identify the pattern of each print (arch, loop, or whorl) and write the pattern name of each unknown and known print. Example: Alice = whorl, etc. for all 7 prints. Part 2: Comparing known and unknown prints Compare the patterns of each print. See if you can exclude any of the prints based on the pattern. Compare the patterns and attempt to match each unknown to a known. This won’t be easy. Compare the minutiae of the prints. Even though they are small, try to identify some of the ridge endings and bifurcations. This could be difficult. Identify the 3 Unknown Prints. The prints may have come from the same person. For each unknown, write the name of the suspect that you think deposited the print. Example: Unknown A = Alice, etc. Part 3: Confirming identity Pick one known and one unknown that you are confident match. From the files listed in the Fingerprints Module, download both images of the 2 prints you have chosen. Open each image in an imaging software program of your choice. If you are unsure, you can Paint in the accessories menu of windows. Arrange the prints so they are next to each other. It should now be easier to see if they are the same. Using the paint tools, I want you to mark 3 or 4 ridge endings or bifurcations in the unknown print. Now try to find these in the known print. Mark the same ridge endings or bifurcations in the known print. Keep looking at the prints until you are able to mark and match at least 3 ridge endings or bifurcations. Number the ridge endings and bifurcations in each printout so it is obvious which minutia match up. For example, if you label a ridge ending in the unknown as #1, and then also label the same ridge ending in the known print as #1. Save each image and submit each image that you have marked (your selected known and selected unknown).

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CASE DETAILS

Far out! Someone has ruined Peter’s science experiment. During the time of the crime, he was playing ball in the house with Greg and Bobby. The three detectives team up and dust for prints and find 3 on some materials on Peter’s desk (Unknown Prints A, B and C). Prints are collected from the usual suspects - you know, Marcia, Jan, Cindy... and Alice! Who ruined Peter’s science experiment? And why?

Part 1: Identifying patterns

The files needed for this assignment are listed in the Fingerprints Module.

Download and view the word document “JS110,A,FPknownsunknowns”. This document contains scans of 3 unknown prints along with 4 known prints from the “suspects”.

Identify the pattern of each print (arch, loop, or whorl) and write the pattern name of each unknown and known print. Example: Alice = whorl, etc. for all 7 prints.

Part 2: Comparing known and unknown prints

Compare the patterns of each print. See if you can exclude any of the prints based on the pattern.

Compare the patterns and attempt to match each unknown to a known. This won’t be easy. Compare the minutiae of the prints. Even though they are small, try to identify some of the ridge endings and bifurcations. This could be difficult.

Identify the 3 Unknown Prints. The prints may have come from the same person. For each unknown, write the name of the suspect that you think deposited the print. Example: Unknown A = Alice, etc.

Part 3: Confirming identity

Pick one known and one unknown that you are confident match.

From the files listed in the Fingerprints Module, download both images of the 2 prints you have chosen.

Open each image in an imaging software program of your choice. If you are unsure, you can Paint in the accessories menu of windows.

Arrange the prints so they are next to each other. It should now be easier to see if they are the same. Using the paint tools, I want you to mark 3 or 4 ridge endings or bifurcations in the unknown print. Now try to find these in the known print. Mark the same ridge endings or bifurcations in the known print. Keep looking at the prints until you are able to mark and match at least 3 ridge endings or bifurcations. Number the ridge endings and bifurcations in each printout so it is obvious which minutia match up. For example, if you label a ridge ending in the unknown as #1, and then also label the same ridge ending in the known print as #1.
Save each image and submit each image that you have marked (your selected known and selected unknown).

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