JPS6029993B2 - Verification display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [a' Technical Field of the Invention The present invention relates to a seal stamp verification device for comparing a stamp with a registered seal stamp, and particularly relates to an improvement in a display method that facilitates visual verification.

'b} Background of the Technology Recently, financial institutions and the like have attempted a method of comparing a customer's seal on a bill, check, etc. with a registered seal using a seal matching device.

The verification device irradiates the stamp to be verified with light and projects it onto an image sensor through an optical lens to obtain image data corresponding to the stamp, which is then compared with the image data of the registered seal.
There are visual and automatic types. In the visual type, images are displayed on a cathode ray tube (hereinafter referred to as CRT) for comparison and judgment is made visually, whereas in the automatic type, the comparison and judgment are made automatically by a device. Therefore, in the case of the visual method, it is necessary that the degree of mismatch between the images to be compared can be easily determined visually. 'c - Prior Art and Problems The conventional method will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a perspective view showing the main parts of the head of a verification device to which the present invention is applied, FIG. 2 is a configuration diagram of the verification device shown in FIG. 1, and FIGS. 3 to 5 are conventional seal verification methods. FIG. As shown in FIGS. 1 and 2, light from a light source lamp 3 illuminates a document 1 on which a seal 2 is printed.

The irradiated light does not reflect the vermilion stamp 2, and
The light is reflected from other white parts, and the reflected light is focused on the image sensor 5 by the lens system 4. In other words, the image of the stamp 2 stamped on the document 1 is projected onto the light receiving surface of the image sensor 5,
The optical image is converted into image data a by the image sensor 5. This image data a is input to the collation unit 6, and registered image data b is taken out from the registration file 7 in which the registration mark is fined as image data, entered into the collation unit 6, analyzed, and superimposed on the CRT 8. It is displayed as an image and visually verified. To explain this matching method, first, in the initial stage of visual matching using a CRT, two images a, q with no gradation to be matched are displayed side by side on a monochrome CRT 8', as shown in Figure 3. I was comparing and collating. Next, as shown in Figure 4,
As a method for easier comparison, the images are displayed alternately with b2 as a negative image and a positive image, and the comparison is made based on the amount of areas that are always bright or dark, that is, the areas that do not match. Next, as shown in FIG. 5, by adopting a color CRT, the two images a3 and wide were color-coded, and when they were superimposed, the matching portion c3 was also given a different color for visual comparison. However, according to the secondary method, registered seals and verification seals are displayed in two gradations even though there are differences in shading or gradation depending on the part.
In addition to large errors in determining the degree of inconsistency between images, this method also has the disadvantage that it is visually unnatural and difficult to see.

[d} Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, and to provide a display method that facilitates visual verification.

{e} Configuration of the invention A calculation section that performs a predetermined calculation on the overlap of gradations of the matching image data and registered image data, and an overlapping image portion and other portions that can be distinguished from each other based on the calculation results by the calculation section. This seal verification display system includes a conversion means for converting into gradation, and displays and outputs the image data converted by the conversion means.

By doing so, the purpose can be achieved. 0
Embodiments of the Invention Below, embodiments of the present invention will be described with reference to the block diagram of FIG.

In FIG. 6, reference numeral 9 denotes a main control section, which controls the collation display by inputting the image data a of the seal and the registered image data b of the registered seal extracted from the registration file 7. The image data a is stored for one hour in one print image buffer.

Reference numeral 12 denotes an arithmetic unit which has the function of digitally calculating the degree of coincidence between the input of image data a and registered image data b based on a predetermined method and sending a signal e to the digital/analog conversion unit 13, and when both data match. has a function of issuing a prohibition signal f to stop the output of the digital/analog converters 14 and 15.

Numerals 13 to 15 are digital/analog converters (hereinafter referred to as D/A converters) which convert digital signals into analog signals for display on the CRT 8.

Reference numeral 16 denotes an intensifier, which has the function of intensifying the signals g, h, and i inputted from the D/A converters 13 to 15 and sending them to the CRT 8.

Since it has such a configuration and function, when performing seal verification, first the image data a with gradation is sent to the main control unit 9,
Further, the registered image data b having gradation is extracted and sent to the main control section 9, and recorded in the stamp image buffer 10 and the registered stamp image buffer 11, respectively. On the other hand, a start signal k is input from the main control section 9 to the calculation section 12 . The image data a from the stamp image buffer 0 and the registered image data b from the registered stamp image buffer 11 are converted into 4-gradation data c,
d and sent to the D/A converters 14 and 15, and also input to the arithmetic unit 12. The calculation unit 12 calculates the overlapping portion of both image data using a method described later, and sends the data to the D/A conversion units 13 to 15 for each display color, where it is converted into an analog signal. /A intensifier 16 into which both image data input to the converters 14 and 15 are converted and scan timing signal 1 from the main controller 9 is input.
The image is then displayed on the CRT8. The calculation method in this case is performed as follows. That is, the gradation of the overlapping portion of the images is calculated from the gradation signals of the stamp image data a and the registered image data b using the following equation. X=M-IA-BI However, when A=0 or B=0, X=0, and the value of A or B is used as is for display.

Here, M is the maximum gradation of the image data (in this case, 3
), A is the gradation of the pixel with the stamp, B is the gradation of the pixel with the registration mark, and X is the gradation of the overlapping part. For example, if the highest gradation of the image data is "3", that is, a 4-gradation display from 0 to 3, the display color of the stamp is green, the display color of the registered mark is red, and the display color of the overlapping part is blue, as follows. will be displayed.

The blue gradation in the overlapping area surrounded by the dashed line in the above table is displayed at the highest gradation when the gradation A of the pixel with the stamp and the gradation B of the pixel with the registration mark are the same value. For example, X=3-(1
-1)=3. In this way, the overlapping portions are displayed with different gradations depending on the degree of matching, and when they match, a single gradation of blue becomes a clear image, making it easier to see. Further, as a different embodiment, a different method of gradation calculation by the calculation unit 12 will be described, although the block diagram is the same. The difference from the above embodiment is that an image that is easier to see is obtained by calculating the average value of the two image data to be compared and determining the display gradation from that value. That is, it is calculated by the following equation.
X=(A+B)/2 Here, the proviso and symbols are the same as in the previous embodiment.

For example, the highest gradation of image data is "3", that is, 4 of 0 to 3.
In gradation display, when the display color of the stamp is green, the display color of the registered mark is red, and the display color of the overlapping part is blue, the following display will occur.
The blue gradation in the overlapping area surrounded by the dashed line in the above table is displayed at the highest gradation when the highest gradation A of the pixel with the stamp and the highest gradation B of the pixel with the registration mark overlap.

That is, in this case, X=(33)/2=3. In this way, the overlapping area is displayed with the average gradation of the two overlapping gradations, so when they match, it is possible to obtain a natural-looking, easy-to-read image with the same gradation as the stamp and registered seal. can.

FIG. 7 is a concrete block diagram of another embodiment of the arithmetic unit 12 shown in FIG. Components in the figure that are the same as those used in FIG. 6 are designated by the same numbers and symbols.

Reference numeral 120 is a coincidence detection circuit that detects and outputs a portion where images overlap, and 121 and 122 are binarization circuits that convert the gradation data c and d of each image into binary gradation data. 123 and 124 are registers which input each gradation data c to the binarization circuits 121 and 122.
, d are stored as gradation threshold values x and y for converting them into binary values.

These threshold values x and y can be changed individually by the operator, and each time they are changed, they are stored in the corresponding register 123 or 124, respectively.

That is, each image data supplied to the calculation unit in the same manner as described above is binarized in binarization circuits 121 and 122, and a match detection circuit 120 determines whether or not they match, and therefore whether or not the images overlap. It will be identified. According to this example, the function values stored in the registers 123 and 124 are
This can be changed by the operator. For this reason, for example, it is possible to detect a match or a mismatch by making the gradation of the image data at the time of registering the mark equal to the gradation of the image data at the time of comparison. Although the above embodiment shows an example of seal verification, it is also applicable to verification of fingerprints, banknotes, etc.

{g) Effects of the Invention As explained above, according to the present invention, it is possible to obtain a matching image that can distinguish the overlapping part according to the overlap in gradation between the stamp and the registered mark, which facilitates visual matching. Therefore, the verification is quick and the judgment accuracy is high.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of the head of a verification device to which the present invention is applied, FIG. 2 is a configuration diagram of the verification device shown in FIG. 1, and FIGS. 3 to 5 are seal verification methods according to the conventional method. Explanatory diagram, No. 6
FIG. 7 and FIG. 7 are block diagrams showing an embodiment according to the present invention and another embodiment of its essential parts. In the figure, 6 is a control unit, 7 is a registration file, and 8 is a CR
T, 9 is the main control unit, ID'ma verification mark image buffer,
11 is a registered mark image buffer, 12 is a calculation unit, 13-
15 is a D/A converter, and 16 is an intensifier. People / Figure Z Figure Figure 6 Figure 7 Figure Ayako Figure 7

Claims (1)

[Claims] 1. Irradiate a verification image written on a medium with light, and collect verification image data having a gradation obtained from the reflected light of the irradiated light and registered image data having a pre-stored gradation,
In a verification device that performs verification by superimposing the display on the display,
a calculation unit that performs a predetermined calculation on the overlap of the gradations of the matching image data and the registered image data; and converting the overlapping image portion and other portions into gradations that can be distinguished from each other based on the calculation result by the calculation unit. and a conversion means,
A verification display method characterized in that image data converted by the conversion means is displayed and output.