JPH08190629A - Seal judging device - Google Patents

Abstract

PURPOSE: To obtain a seal judging device which can accurately judge seal fast. CONSTITUTION: This device is equipped with a conveyance path 4 which conveys sheet paper 2 having a seal. On one side of the conveyance path 4, a light source 6 which lights the sheet paper 2 and a half-mirror 8 which receives reflected light from the sheet paper 2 are provided. One of two light beams which are branched in two through the half-mirror 8 is made incident on a seal color cutoff filter 12 through a lens 11 and the other is made incident on a seal color transmission filter 16 through a lens 15. The light beam passed through the cutoff filter 12 is photoelectrically converted by a CCD 14, passed through an amplifier 22 and an AD converter 26, and recorded in a memory 32, and the light beam passed through a transmission filter 16 is recorded in a memory 34 similarly. A processor 36 reads data out of the memories 32 and 34 and also compares them with prepared standard data to judge the seal according to the comparison result.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stamp discriminating apparatus for discriminating a stamp imprinted on a paper sheet, and more particularly to a stamp discriminating apparatus for discriminating a stamp by discriminating the position, shape and color of the stamp. .

[0002]

2. Description of the Related Art Conventionally, as a seal discriminating device, a device provided with a seal color cut-off filter for selectively cutting off only a seal color of a seal provided on a paper sheet is known. When a stamp is discriminated using this type of device, first, the paper sheet is irradiated with the reference light, and the reflected light from the paper sheet is incident on the CCD through the seal color cutoff filter. Then, the two-dimensional data photoelectrically converted by the CCD is compared with the standard data prepared in advance to collate the data. As a result of the collation, when the two-dimensional data matches the standard data, it is determined that the stamp shapes match each other, and the stamp is determined.

[0003]

However, when the seal color cutoff filter is used as described above, light having a wavelength in the vicinity of the seal color is also cut off, so that the color pattern is slightly different from the seal color. However, there is a possibility that it will be judged as a seal, and there is a problem that accurate judgment cannot be made.

Further, when the shape of a stamp is discriminated using two-dimensional data as in the conventional case, there is a problem that it takes a lot of time to collate the data and a lot of time is required for discriminating the stamp. The present invention has been made in view of the above points, and an object thereof is to provide a seal discriminating apparatus capable of discriminating a stamp accurately and at high speed.

[0005]

In order to achieve the above object, a seal discriminating apparatus according to the present invention selectively blocks a seal color component contained in a reflected light beam from a paper sheet having a seal of a certain seal color. A seal color cutoff filter, a seal color transmission filter that selectively transmits a seal color component included in the reflected light beam, a first detection unit that detects a light component that has passed through the seal color cutoff filter, and the seal. Second detection means for detecting the light component that has passed through the color transmission filter;
A determination unit that compares the detection data from the first detection unit and the detection data from the second detection unit with standard data prepared in advance, and determines the seal based on each comparison result. I have it.

Further, the seal discriminating apparatus according to the present invention includes an illumination means for illuminating a paper sheet having a seal of a certain seal color,
A branching means for branching the reflected light from the paper sheet into two systems, a seal color cutoff filter for selectively blocking only the seal color component contained in one branched light ray, and the other branched light ray. A seal color transmission filter that selectively transmits only the seal color component included, a first conversion unit that photoelectrically converts the light component that has passed through the seal color cutoff filter, and a light component that has passed through the seal color transmission filter. Second conversion means for photoelectric conversion, first AD converter for digitizing the output signal from the first conversion means, and second A for digitizing the output signal from the second conversion means.
A D converter, and a discriminating means for discriminating the seal by comparing the digital signal output from the first AD converter and the digital signal output from the second AD converter with standard data prepared in advance, respectively. Is equipped with.

[0007]

According to the seal discriminating apparatus of the present invention, a paper sheet having a seal of a certain seal color is illuminated and the reflected light beam is incident on the seal color cutoff filter and the seal color transmission filter. In the reflected light beam that has entered the seal color cutoff filter, the seal color component contained in the reflected light beam is selectively blocked here, and the light component that has passed through the seal color cutoff filter is first
It is detected by the detection means. Further, in the reflected light beam that has entered the seal color transmission filter, the seal color component included in the reflected light beam is selectively transmitted here, and the light component that has passed through the seal color transmission filter is detected by the second detection means. . Each detection data detected by the first and second detection means is
The discriminating means is supplied to the discriminating means, and the discriminating means compares the detected data with corresponding standard data prepared in advance, and discriminates the seal based on the comparison result.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 1, the seal discriminating apparatus according to the embodiment of the present invention includes a conveying path 4 for conveying a sheet 2 having a seal as a discrimination target imprinted thereon. Drive rollers 4a and 4b are provided on the conveyance path 4, and the paper sheet 2 can be conveyed along the conveyance path 4 in the main scanning direction indicated by an arrow A in the drawing.

The paper sheet 2 to be conveyed is provided on one side of the conveying path 4.
A light source 6 is provided as an illuminating means for irradiating the surface of the with a reference light beam. At the position where the light beam from the light source 6 is reflected by the paper sheet 2, a half mirror 8 is provided as a branching unit that branches the reflected light beam into two systems.

On one of the optical paths branched by the half mirror 8, only a seal color light filter (a light component having the same wavelength as the seal color) can be selectively shielded.
2 (hereinafter, simply referred to as a cutoff filter 12) is provided via the condenser lens 11, and the cutoff filter 12
A CCD 14 is provided on the subsequent optical path. Further, on the other optical path branched by the half mirror 8, a seal color transmission filter 16 (hereinafter, simply referred to as a transmission filter 16) capable of selectively transmitting only the light component of the seal color has a condenser lens 15. Similarly, a CCD 18 is provided on the optical path downstream of the transmission filter 16 in the same manner. The CCDs 14 and 18 are CCDs as line sensors that function as conversion means (or detection means) and extend in a sub-scanning direction that is substantially orthogonal to the transport direction of the paper sheet 2, and the paper sheet 2 is mainly used. The entire surface of the paper sheet 2 is scanned by being conveyed in the scanning direction.

The output terminals of the CCDs 14 and 18 are connected to amplifiers 22 and 24, respectively.
At the output end of the first and second AD converter 26,
28 is connected. And each AD converter 2
Memories 32 and 34 are connected to the reference numerals 6 and 28, and each of the memories 32 and 34 is a processor 36 as a determination means.
It is connected to the.

The seal discriminating apparatus constructed as described above is
It operates as follows. When the surface of the paper sheet 2 conveyed through the conveyance path 4 is irradiated with the reference light beam from the light source 6, the reflected light beam from the paper sheet 2 is incident on the half mirror 8. A part of the reflected light beam incident on the half mirror 8 is passed as it is, and the rest is reflected at a substantially right angle, and the light beam is branched into two systems.

One of the light beams branched into two systems passes through a cutoff filter 12 through a condenser lens 11,
The light enters the CCD 14 and is photoelectrically converted here. on the other hand,
The other branched light beam passes through the transmission filter 16 through the condenser lens 15, and then enters the CCD 18, where it is photoelectrically converted.

Output signals photoelectrically converted by the CCDs 14 and 18 and output are amplified by amplifiers 22 and 24, digitized by AD converters 26 and 28, and stored in memories 32 and 34. Then, the data digitized and stored in the memories 32 and 34 are read out one by one by the processor 36, processed by the processor 36, and the seal is discriminated.

Next, the seal discriminating operation of the processor 36 will be described with reference to FIG. When discriminating the stamp, the processor 36 first discriminates the stamp position of the paper sheet 2 using the data stored in the memory 32 (data passed through the cutoff filter 12), as shown in step 41. When the stamp position is determined, the stamp data of only the portion where the stamp is present is taken out, and as shown in step 42, the one-dimensional data of the predetermined position is extracted from the stamp data.

The extracted one-dimensional data is processed in step 43.
As shown in (1), it is compared with standard data prepared at the same position (one-dimensional data serving as a discrimination reference), and the shape of the seal is discriminated based on the comparison result. That is, if the one-dimensional data matches the standard data (step 44), it is determined that the shapes match, and if the one-dimensional data does not match the standard data (step 45), the shape mismatches are determined. .

When the shape is discriminated in this way, the color of the stamp is discriminated, as shown in step 46. When the stamp color is determined, the above-described one-dimensional data is prepared, and one-dimensional data similarly extracted from the data stored in the memory 34 (data that has passed through the transmission filter 16) is prepared. Integrate each data,
Each of these integrated values is compared with a corresponding standard integrated value prepared in advance. Then, color matching is determined only when both of the two integrated values match the standard integrated value (step 47), and color mismatch is determined otherwise (step 48).

As described above, the seal position is discriminated, the seal shape is discriminated, and the seal color is discriminated only when the seal color is discriminated (step 49). Next, the method for determining the stamp position described above will be described in more detail with reference to FIGS.

When discriminating the stamp position of the stamp imprinted on the paper sheet 2, first, the two-dimensional data of the paper sheet 2 stored in the memory 32 is read into the processor 36. And
The processor 36 adds this data along the sub-scanning direction of the paper sheet 2 to calculate one-dimensional data along the main scanning direction of the paper sheet 2 having an output distribution as shown in the graph of FIG. (Step 51).

Next, a range (A1 to A2) which is a range in which the stamp should exist and which is determined in advance in the main scanning direction is read from a memory (not shown), and only the data within this range is left. Except the data except
To A2 (step 52).

Then, as shown in step 53, the length B of the stamp data within this range is calculated, and the lower limit value BL and the upper limit value BH of B, which are predetermined in consideration of the error, are read from a memory (not shown). , As shown in step 54, it is judged whether or not B falls within the range from BL to BH. If B is within this range (BL to BH), it is determined that a seal is present, and as shown in step 55, the seal position along the main scanning direction is specified within range C. Also, B
Is outside the range (BL to BH), step 56
As shown in (4), it is determined that there is no seal, and the determination operation ends.

As described above, when the seal position along the main scanning direction is determined, this data is added along the main scanning direction in consideration of only the data within the range C, as shown in the graph of FIG. One-dimensional data along the sub-scanning direction having various output distributions is calculated (step 57).

Next, a range (D1 to D2) which is a range in which the seal should exist and which is determined in advance in the sub-scanning direction is read from a memory (not shown), and only the data within this range is left. Except the data other than, the data is D1
To D2 (step 58).

Then, as shown in step 59, the length E of the seal data within this range is calculated, and the lower limit value EL and the upper limit value EH of E, which are predetermined in consideration of the error, are read from a memory (not shown). , As shown in step 60, it is determined whether E is between EL and EH. If E is within this range (EL to EH), it is determined that a seal is present, and as shown in step 61, the seal position along the sub-scanning direction is specified within range E. Also, E
Is out of range (EL to EH), step 62
As shown in (4), it is determined that there is no seal, and the determination operation ends.

As described above, when the seal position in the main scanning direction is specified within the range C and the seal position in the sub-scanning direction is specified within the range E, as shown in step 63, The stamp position is determined. Then, the data of only the determined stamp position is stored again in the memory 32 as the stamp data.

Next, the shape determination of the stamp will be described in detail with reference to FIGS. 6 and 7. When determining the shape of the seal, first, the seal data stored only in the seal portion stored in the memory 32 is read into the processor 36, and the seal data is enlarged as necessary. Then, as shown in FIG. 7, one-dimensional data (one-dimensional data along the line 70) at a predetermined position in the stamp data is extracted (step 71). The extracted one-dimensional data is compared with reference data (standard data that serves as a reference at the same position as the one-dimensional data) prepared in advance in a memory (not shown), and
The two data are collated (step 72).

Then, as shown in step 73, it is judged whether or not the two data match, and as a result, 2
If the two data match (step 74),
If the shapes match and the two data do not match (step 75), the shapes do not match.

Next, the discrimination of the stamp color will be described in detail with reference to FIG. When the stamp color is determined, as described above, the one-dimensional data from the memory 32 is prepared and the one-dimensional data from the memory 34 is similarly prepared (step 81). When one-dimensional data is extracted from the memory 34, data having the same coordinates as the one-dimensional data extracted from the memory 32 is extracted. As a result, the one-dimensional data extracted from the data passed through the cutoff filter 12 and the one-dimensional data extracted from the data passed through the transmission filter 16 are extracted under the same condition. Then, as shown in step 82, integrated data obtained by integrating each of the prepared one-dimensional data is prepared.

On the other hand, the lower limit value SCL and upper limit value SCH of the integrated data obtained by integrating the cutoff data serving as the reference on the cutoff filter side, and the lower limit value SPL and the upper limit value of the integrated data obtained by integrating the reference transmission data on the transmission filter side. SPH and SPH are stored in advance in a memory (not shown). Then, as shown in step 83, SCL, SCH, SPL, and SPH are read out and compared with the above-mentioned integral data, and as shown in step 84, the integral data SC on the cutoff filter side is SCL.
To SCH, and whether the transmission filter integrated data SP is between SPL and SPH,
Judge.

As a result, the seal color coincidence is determined only when each of the integrated data is within the above range (step 85), and the seal color disagreement is determined otherwise (step 86). In other words, the output value of the data that has passed through each filter changes depending on the wavelength (color) of the light beam incident on the CCD, so a portion of the seal data is extracted and the integrated value is compared to determine the seal color. it can.

As described above, the seal discriminating apparatus according to this embodiment splits the reflected light beam from the paper sheet into two systems, one of the light beams passes through the seal color cutoff filter, and the other light beam is the seal. It passes the color transmission filter. Then, the light passing through each filter is photoelectrically converted, digitized, and the position and shape of the seal are discriminated using the one-dimensional data extracted from the data on the cutoff filter side, and the one-dimensional data on the cutoff filter side and the transmission filter side are determined. The color of the seal is determined using the one-dimensional data of.

Therefore, it is possible to more accurately discriminate the stamp, particularly the stamp color. Further, by performing the discrimination using the one-dimensional data, it is possible to speed up the discrimination operation as compared with the conventional discrimination using the two-dimensional data.

When the background color of the stamp imprinted on the paper sheet is black or a pattern with a lot of black, one-dimensional data is obtained by combining the data after passing through the cutoff filter and the transmission filter. Further accurate seal discrimination is possible. FIG. 9 is a flow chart showing the operation of discriminating the stamp position in the stamp discrimination in another embodiment. The case of combining the data after passing through the cutoff filter and the transmission filter will be described with reference to this drawing. The configuration of this device is the same as that described with reference to FIG. 1, but the processing in the processor 36 is different.

That is, after passing through the cutoff filter 12, the two-dimensional data of the paper sheet 2 stored in the memory 32 is read into the processor 36 (step 91). Then, after passing through the pass filter 16, the two-dimensional data of the paper sheet 2 stored in the memory 34 is read into the processor 36 (step 92).

Then, the processor 36 integrates these two-dimensional data to calculate one-dimensional data along the main scanning direction of the paper sheet 2 having an output distribution as shown in FIG. 4 (step 93). The calculation of the one-dimensional data can be obtained by, for example, taking the exclusive OR of the data from the memories 32 and 34 and adding the output data along the sub-scanning direction. After this step 93, the processing is performed as in steps 52 to 56 as described with reference to FIG.

When the seal position along the main scanning direction is specified within the range C in step 55, the two-dimensional data of the paper sheet 2 stored in the memory 32 is stored in the processor 36 after passing through the cutoff filter 12. It is read again (step 94).
Then, after passing through the pass filter 16, the memory 3
2D data of the paper sheet 2 stored in the processor 4
It is read again in 6 (step 95).

Then, the processor 36 integrates these two-dimensional data to calculate one-dimensional data along the main scanning direction of the paper sheet 2 having an output distribution as shown in FIG. 5 (step 96). In the calculation of the one-dimensional data, for example, the data output by taking the exclusive OR of the data from the memories 32 and 34 is added along the main scanning direction considering only the data within the range C. can get.
After this step 96, as described with reference to FIG. 3, the processing is performed as in steps 58 to 63 to determine the stamp position.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention. For example, the detecting means in this embodiment is not limited to the CCD as the line sensor described above, but may be an area type CCD.
It can also be. Further, the one-dimensional data extracted from the seal data can be extracted from any position, and a plurality of data may be extracted for the purpose of improving the discrimination accuracy. Further, in the above-mentioned embodiment, the reflected light rays from the paper sheets are branched into two systems and the two CCDs simultaneously scan the paper sheets, but the two CCDs scan the paper sheets separately. Is also good.

[0039]

As described above, since the stamp discriminating apparatus of the present invention has the above-described structure and operation, it is possible to discriminate the stamp accurately and at high speed.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a stamp discriminating apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of a processor incorporated in the apparatus shown in FIG.

FIG. 3 is a flowchart showing a seal position determination operation in seal determination.

FIG. 4 is a schematic diagram showing a process of determining a seal position of a paper sheet along a main scanning direction.

FIG. 5 is a schematic diagram showing a process of determining a seal position along a sub-scanning direction of a paper sheet.

FIG. 6 is a flowchart showing a seal shape determination operation in seal determination.

FIG. 7 is a schematic diagram showing the extracted stamp data and its one-dimensional data.

FIG. 8 is a flowchart showing a seal color determination operation in seal determination.

FIG. 9 is a flowchart showing a seal position determining operation according to another embodiment of the present invention.

[Explanation of symbols]

2 ... Paper sheets, 4 ... Conveying path, 4a, 4b ... Conveying roller, 6
... light source, 8 ... half mirror, 11, 15 ... condenser lens,
12 ... Seal color blocking filter, 14, 18 ... CCD, 1
6 ... Seal color transmission filter, 22, 24 ... Amplifier, 2
6, 28 ... AD converter, 32, 34 ... Memory, 3
6 ... Processor.

Claims (5)

[Claims] 1. A seal color cutoff filter for selectively blocking a seal color component contained in a light ray reflected from a paper sheet having a seal color of a certain seal color, and a seal color component contained in the reflected light ray selectively. A stamp color transmission filter that transmits the light; a first detecting unit that detects the light component that has passed through the seal color blocking filter; a second detection unit that detects the light component that has passed through the seal color transmission filter; The detection data from the first detection means and the detection data from the second detection means are respectively compared with standard data prepared in advance, and the determination means determines the seal based on each comparison result. A seal discriminating device characterized by being present. 2. An illumination means for illuminating a paper sheet having a seal of a certain seal color, a branching means for branching a reflected light beam from the paper sheet into two systems, and a seal included in one of the branched light rays. A seal color cutoff filter that selectively blocks only color components, a seal color transmission filter that selectively transmits only the seal color components contained in the other branched light beam, and a light component that has passed through the above seal color cutoff filter. First photoelectric conversion means, photoelectric conversion of the light component passing through the seal color transmission filter, and second AD converting the output signal from the first conversion means into a digital signal. A converter, a second AD converter for digitizing the output signal from the second converting means, a digital signal output from the first AD converter, and the second AD converter. Stamp discriminating apparatus characterized by comprising: a discriminating means for discriminating a stamp by comparing the digital signal output from the coater and standard data prepared in advance, respectively. 3. The discriminating means discriminates the position of the seal based on the digital signal output from the first AD converter, and 1 is extracted from the discriminated seal position.
The seal shape is discriminated by comparing the dimensional data with corresponding standard data prepared in advance, and the above-mentioned 1 based on the digital signal output from the second AD converter is determined.
It is possible to determine the color of the seal by preparing another one-dimensional data having the same coordinates as the one-dimensional data, integrating each one-dimensional data, and comparing the integrated data with the corresponding standard data prepared in advance. The seal discriminating apparatus according to claim 2, which is characterized in that. 4. The discriminating means comprises the first and second A's.
The seal is determined based on the digital signal output from the D converter, and the seal shape is determined by comparing the one-dimensional data extracted from the determined seal position with the corresponding standard data prepared in advance, Second AD above
Prepare another one-dimensional data with the same coordinates as the above one-dimensional data based on the digital signal output from the converter,
3. The stamp discriminating apparatus according to claim 2, wherein each one-dimensional data is integrated and the color of the stamp is discriminated by comparing the integrated data with corresponding standard data prepared in advance. 5. The discriminating means discriminates the position of the seal based on the detection data from the first detecting means, and determines the color of the seal based on the detecting data from the first and second detecting means. The stamp discriminating device according to claim 1, wherein the stamp discriminating device discriminates.