JPS5916080A - Seal-impression collation method - Google Patents

Abstract

PURPOSE:To shorten the time necessary for collating seal impression and to improve its efficiency by checking a seal impression by two stages, i.e. a simple check and a severe check. CONSTITUTION:A transparent sheet 10 with an input seal-impression is set on a movable table 2 and a transparent sheet 1 with a registered seal impression is set on a fixed table 3; and those sheets 1 and 10 are illuminated by a projector 4 and a photodetecting sensor 5 consisting of a CCD photodetects transmitted light from the sheets 1 and 10. The output of this sensor 5 is converted by an A/D converter 51 into a digital signal, which is inputted to an operation processor 6 through an interface 52. The processor 6 regards data corresponding to the photodetection amount of the sensor 5 as a specific address of an RAM7, and necessary data is read out by the program in the RAM70 to decide on whether the seal-impression is true or not, thereby controlling motors 26-28 for driving the table 2. The decision making processing of the processor 6 is divided into two stages, i.e. simple check and severe check to improve the efficiency of the seal collation.

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to the use of a seal imprint registered in advance (hereinafter referred to as a registered seal imprint) and a seal imprint used at the time of transaction in banks and other various transaction systems that use seal impressions. The present invention relates to a seal stamp matching method for comparing a seal impression with a seal impression (hereinafter referred to as an input seal impression) and determining the authenticity of a used seal stamp based on the degree of matching.

<Background of the Invention> The conventional seal verification method is to visualize the registered seal impression and the input seal impression, compare the entire constituent strokes or specific parts of the two images, and detect the degree of matching. This method determines the authenticity of a seal.However, since this type of method determines the authenticity of a seal with a single verification process, it is necessary to perform accurate checks between all input seal impressions. For this reason, it always took a long time to verify the seal.In particular, traders sometimes use a seal that is different from the registered seal due to a mistake, and even in such cases, it is difficult to check the seal imprint accurately. This causes a significant drop in work efficiency.

<Objective of the Invention> An object of the present invention is to provide a new seal stamp verification method that improves the efficiency of seal stamp verification by performing a seal imprint check in two stages: a simple check and a sophisticated check. .

<Structure and Effects of the Invention> In order to achieve the above object, the present invention applies light to a transparent sheet on which a registered seal is affixed and converts the transmitted light into a CCD (Ch
A procedure for receiving light with a light-receiving sensor having multiple pixels, such as a large coupled device), and extracting standard data corresponding to the total amount of light received and the amount of light received for each pixel from this light-receiving sensor, and inputting a transparent sheet with a registration seal stamped on it. After aligning the transparent sheet with the stamp imprinted on it and overlapping both stamp impressions, light is applied to both transparent sheets, and the transmitted light is received by the light receiving sensor, which detects the total amount of light received and each pixel. A procedure for extracting the verification data corresponding to the amount of received light, a procedure for comparing the verification data regarding the total amount of received light with reference data and determining the authenticity of the input stamp based on the degree of matching, and a procedure for extracting the verification data corresponding to the amount of received light. The system is configured to perform a series of procedures for comparing the stamp impression with verification data regarding the amount of light received for each pixel and reference data, and determining the authenticity of the input stamp impression based on the degree of matching.

According to the present invention, seals used by a transaction person by mistake or counterfeit seals with low accuracy can be identified through the simple verification process in the first step, which reduces the time required for the verification process and improves business efficiency. The invention achieves excellent effects such as improved performance.

<Description of Embodiments> FIGS. 1 to 3 show a schematic configuration of a seal stamp matching method according to the present invention and a seal stamp matching device used for implementing the present invention.

The illustrated device includes a movable table 2 for setting a transparent sheet 10 stamped with an input seal impression, a fixed table 3 for setting a transparent sheet 1 stamped with a registered seal impression,
The movable table 2 and the fixed table 3 are equipped with a light projector 4 that projects light onto a transparent sheet and a light receiving sensor 5 that receives transmitted light.
are placed vertically opposite each other so that the two seal impressions are close to each other and overlap each other.

As shown in FIG. 3, the movable table 2 has a movable shaft 22 slidably arranged at right angles to a fixed shaft 21, and a ring-shaped mounting base 23 is slidably supported on the movable shaft 22. A rotating ring 24 provided with a seat mounting groove is freely rotatably disposed inside the mounting base 23. A friction roller 25 connected to a motor 26 is brought into contact with the circumferential surface of the rotating ring 24, and the rotating ring 24 is forcibly rotated by the drive of the roller 25.

The above-mentioned light receiving sensor 5 uses an image sensor such as a C'CD in which a plurality of vertical and horizontal pixels are equally arranged, and each pixel accumulates a charge according to the amount of light received, and each accumulated charge is stored in a bit serial manner. It can be taken out to the outside as an analog signal.

The output of this light receiving sensor 5 is as shown in FIG.
1) After being converted into a digital signal by the converter 51, it is sent to the arithmetic processing unit 6 (hereinafter referred to as CPU) via the interface 52.
). The CPU is connected to the light receiving sensor 5.
The data corresponding to the total amount of light received and the amount of light received for each pixel is stored in RAM 7 (Random Access Mem
ory) to a predetermined address, and the ROM7
Based on the program stored in the Q (Read On Memory), necessary data is read from the RAM 7Q and processing for determining the authenticity of the seal is executed.

The CPU 6 also includes motors 26, 27, and 28 for driving the movable table 2 via an interface 29.
is connected, the motor 28 moves the moving shaft 22, and the motor 2
7 to horizontally move the mounting bases 23, and rotate the rotary ring 24 by the motor 26 to control the positioning operation of the manual seal impression with respect to the registered seal impression.

FIG. 5 shows each procedure of the seal verification method according to the present invention.

First, in step 81, after setting the transparent sheet 1 with the registration stamp stamped on the fixed table 3 as shown in FIG. do. In this case, since the vermilion part of the seal impression blocks light, the light receiving sensor 5 corresponding to the vermilion part
For each pixel, the amount of light received is approximately zero, and on the other hand, for each pixel of the light receiving sensor 5 corresponding to the background or blank area, the amount of light received changes depending on the percentage of the pixel that includes the vermillion portion. Then, in the next step 82, reference data regarding the amount of light received at the edge of the light receiving sensor 5 and the amount of light received for each pixel is stored at a predetermined address in the RAM 7.

Next, in step 83, after setting the transparent sheet 10 with the input stamp stamped on the movable table 2 (as shown in FIG. 2), the projector 4 and light receiving sensor 5 are operated, and in the next step 84, the motor 26..27.2
8 to move the movable table 2 to align the registered seal impression and the input seal impression. The positioning method shown in the example is based on the fact that when the two seal impressions overlap the most, the amount of light received at the edge of the light receiving sensor 5 is maximum, and when this becomes the maximum, the determination in step 85 becomes YES. ,
Complete the alignment process. Then, the collation data regarding the amount of light received at the edge of the light receiving sensor 5 and the amount of light received for each pixel in this state is taken into the CPU 6, and the data is stored in the RAM.
7 to a predetermined address.

Next, in step 86, the CI) U6 RAs the reference data and verification data regarding the amount of light received at the edge of the light receiving sensor 5.
The degree of coincidence between both data is determined by reading from M7. For example, the CPU 6 calculates the difference between both data, and if the calculation result is included in a predetermined tolerance range, the determination in step 87 is YES and the process proceeds to the next step 88, while the calculation result is If it falls outside the allowable range, the determination in step 87 becomes NO, and it is concluded that the input seal imprint is a "fake seal imprint" that is different from the registered seal imprint.

In this way, with a simple discrimination procedure, it is possible to detect incorrectly used seal stamps due to mistake and counterfeit seal stamps with low accuracy.

For the input seal impressions that have passed this simple discrimination procedure, in step 88, the reference data and verification data for light reception for each pixel are read out from the R'AM7,
Data for each corresponding pixel is sequentially compared. Then, when the number of pixels determined to be "data matching" exceeds a predetermined ratio to the total number of pixels, the determination in step 89 is YES.
Therefore, it is concluded that the input seal impression is a "true seal" that matches the registered seal impression.

On the other hand, when the number of pixels determined as "data matching" is less than a predetermined ratio, the determination in step 89 becomes NO, and it is concluded that the input seal impression is a "fake seal stamp" different from the registered seal impression.

Thus, by the above-described second stage discrimination procedure, a counterfeit seal stamp can be detected with high accuracy.

[Brief explanation of the drawing]

1 and 2 are principle explanatory diagrams showing the steps of the seal verification method according to the present invention, FIG. 3 is a plan view showing an example of the structure of the movable table, and FIG. 4 is an example of the circuit configuration of the seal verification device. The block diagram, FIG. 5, is a flowchart showing the seal verification operation. 1.10... Transparent sheet 4... Emitter 5... Light receiving sensor patent applicant Tateishi Electric Co., Ltd.

Claims (1)

[Claims] A procedure for projecting light onto a transparent sheet on which a registered seal impression is affixed and extracting reference data corresponding to the total amount of light received and the amount of light received for each pixel from a light receiving sensor having a plurality of pixels; The pressed transparent sheet and the transparent sheet with the input seal imprint are aligned, the two imprints are superimposed, and light is projected onto both transparent sheets to correspond to the total amount of light received by the light receiving sensor and the amount of light received for each pixel. A procedure for extracting verification data regarding the total amount of received light, a procedure for determining the authenticity of the input seal impression by comparing the verification data regarding the total amount of received light with reference data, and a step for determining the authenticity of the input seal imprint in the previous step; A seal verification method characterized by performing a series of steps of comparing verification data related to reference data with reference data to determine the authenticity of an input seal imprint.