Patent ID: 8577121

Claim:
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 ρ 1 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(B 1 ) represents an area of a seal region of each of the comparative seal imprints, and n(B 1 out) 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 ρ 2 represents the packing rate of the compared seal imprint, n(A) represents the area of the seal region of the reference seal imprint, n(B 2 ) represents an area of a seal region of the compared seal imprint, and n(B 2 out) 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.