US 8,577,121 B2Granted

Forged seal imprint inspection method and recording medium

AssigneeRepublic of Korea (National Forensic Service Director Ministry of Public Administration and Security)

InventorsJoong Lee, Young Su Lee, Jun Suk Kim, Ki Woong Moon, Byung Wook Park

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Abstract

Disclosed herein is a forged seal imprint checking method which includes a step ST-101 of generating a reference seal imprint from a genuine seal (ST-110) and a step ST-121 of comparing a compared seal imprints with the reference seal imprint to calculate characteristic values of the compared seal imprint with respect to the reference seal imprint (ST-140). According to experimental results, forged seal imprints obtained by seals forged by etching a zinc plate or a resin plate can be recognized and forged seal imprints generated by seals forged through computer copy can be also recognized. Accordingly, an objective basis on which it can be determined whether seal imprints on documents are forged in civil and criminal cases can be provided to prevent errors which may be generated when seal imprints are inspected with the naked eyes or microscopes.

Claims9

Dependent claims

A forged seal imprint inspection method comprising:

obtaining, by a computer, one or more genuine seal imprints to generate comparative seal imprints;
generating, by the computer, a reference seal imprint by averaging the comparative seal imprints;
obtaining, by the computer, a compared seal imprint to be inspected;
calculating, by the computer, characteristic values of the comparative seal imprints by comparing the comparative seal imprints with the reference seal imprint;
calculating, by the computer, characteristic values of the compared seal imprint by comparing the compared seal imprint with the reference seal imprint;
comparing, by the computer, the characteristic values of the comparative seal imprints with the characteristic values of the compared seal imprint;
and
determining, by the computer, whether the compared seal imprint is forged, based on said comparing of the characteristic values,
wherein the characteristic values of the comparative seal imprints include packing rates, the packing rates of the comparative seal imprints being calculated according to
ρ1
=
1
-
n
⁡
(
A
)
-
(
n
⁡
(
B
⁢
⁢
1
)
-
n
⁡
(
B
⁢
⁢
1
⁢
⁢
out
)
)
n
⁡
(
A
)
,
where ρ1 represents the packing rate of each of the comparative seal imprints, n(A) represents an area of a seal region of the reference seal imprint, n(B1) represents an area of a seal region of each of the comparative seal imprints, and n(B1out) represents an area of a portion of the seal region of each of the comparative seal imprints which is not included in the seal region of the reference seal imprint, and
wherein the characteristic values of the compared seal imprint include a packing rate, the packing rate of the compared seal imprint being calculated according to
ρ2
=
1
-
n
⁡
(
A
)
-
(
n
⁡
(
B
⁢
⁢
2
)
-
n
⁡
(
B
⁢
⁢
2
⁢
⁢
out
)
)
n
⁡
(
A
)
,
where ρ2 represents the packing rate of the compared seal imprint, n(A) represents the area of the seal region of the reference seal imprint, n(B2) represents an area of a seal region of the compared seal imprint, and n(B2out) represents an area of a portion of the seal region of the compared seal imprint which is not included in the seal region of the reference seal imprint.

85 more elements

A forged seal imprint inspection method comprising:

obtaining, by a computer, one or more genuine seal imprints to generate multiple preparatory seal imprints;
separating, by the computer, each of the preparatory seal imprints into regions;
generating, by the computer, a reference seal imprint by averaging seal regions of the preparatory seal imprints;
obtaining, by the computer, a compared seal imprint to be inspected;
separating, by the computer, the compared seal imprint into regions;
comparing, by the computer, the reference seal imprint with a seal region of the compared seal imprint;
and
calculating, by the computer, characteristic values of the compared seal imprint with respect to the reference seal imprint;
and
determining, by the computer, whether the compared seal imprint is forged, based on the characteristic values of the compared seal imprint,
wherein the characteristic values of the compared seal imprint include a packing rate, the packing rate of the compared seal imprint being calculated according to
ρ
=
1
-
n
⁡
(
A
)
-
(
n
⁡
(
B
)
-
n
⁡
(
B
out
)
)
n
⁡
(
A
)
,
where ρ represents the packing rate of the compared seal imprint, n(A) represents an area of a seal region of the reference seal imprint, n(B) represents an area of the seal region of the compared seal imprint, and n(Bout) represents an area of a portion of the seal region of the compared seal imprint which is not included in the seal region of the reference seal imprint.

39 more elements

Dependencies are inferred from the claim text.