JP2501577B2 - IC card - Google Patents

Description

The present invention relates to an IC card having a personal identification function.

[Prior art and its problems] In the conventional IC card, a personal identification number is stored in the built-in memory, and it is determined whether or not the person is the person by comparing it with the number input to the reader / writer. There is.

However, since the person is confirmed only by collating the personal identification number, regardless of whether or not the person is actually the person, if the entered numbers match, the person is mechanically determined to be the person. Had a point. Therefore, it has not been possible to sufficiently prevent unauthorized use by others.

[Means for Solving Problems] An IC card according to the present invention includes one memory storing a personal identification number and image data for confirming the person, and
An IC card having a CPU for controlling the input / output of data in one memory, wherein the image data for confirming the person is image data that requires the tone of the image data of the facial photograph, and the tone Of the image data you do not need,
The image data that includes at least one image data including the image data of the face photograph and that requires the gradation and the image data that does not require the gradation are each compressed by a predetermined different compression method. In the case of confirming whether the person who possesses the card is the card holder himself or herself based on the data stored in one memory and stored in the one memory, the one of the one is controlled by the CPU. Only when the personal identification number stored in the memory and the personal identification number of the person who owns the card match, by permitting the reading of the image data stored in the one memory, the confirmation by the personal identification number is followed by the confirmation of the image data. If the personal identification numbers do not match, the data for confirming the identity of the one memory is verified. By prohibiting read / write to data area, it is characterized in that it is configured to prevent access directly from outside the data area.

[Operation] It is possible to identify whether or not the person is the person based on the image data, and it is possible to confirm the person much more surely as compared with the case where only the personal identification number is used.

As the image data, an image such as a facial photograph, a seal stamp, or a handwritten signature converted into an electric signal may be used.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 (A) is a schematic configuration diagram of an embodiment of an IC card according to the present invention, and FIG. 1 (B) is a schematic diagram showing a memory map thereof.

In FIG. 1A, the CPU 1 operates by a clock CLK, a reset signal RST, and power supplies Vcc and GND supplied from the outside, controls the memory 2, and writes or reads data SIO. The memory 2 is preferably EPROM or EEPROM. Program power Vpp is supplied from the outside.

As shown in FIG. 1B, the memory 2 stores image data such as a face photograph, a signature, and a seal stamp, in addition to the personal identification number. Of course, appropriate image data may be selected and stored according to the application.

Here, as the data of the memory 2, as shown in FIG. 1B, the data of the personal identification number is stored at the head position,
After that, the image data of the face photograph, the image data of the signature, the image data of the seal stamp, and the application data are sequentially stored. The input / output of the data in the memory 2 is controlled by the CPU 1. In this case, the data such as the personal identification number, the face photograph, and the signature used in the identification of the person in the memory 2 have the same personal identification number under the control of the CPU 1. If not, it is impossible to read or write directly from the outside. In other words, even if the personal identification number of the memory 2 or the data area of the face photograph is accessed from the outside, the access is prohibited by the CPU 1, and the alteration of the data is prevented and the security is enhanced.

FIG. 2 is a schematic system configuration diagram showing an example of how to use the present embodiment.

In the figure, the IC card 10 of this embodiment is inserted into the reader / writer 11 to input / output data.

The reader / writer 11 is connected to the computer 12, and the computer 12 is connected to the video memory 13. The video memory 13 displays on the monitor 14 the image data input under the control of the computer 12. Also, a video camera 15 is connected to the video memory 13 to store captured image data.

In the above system, the personal identification work is performed as follows.

First, the customer sets the IC card 10 in the reader / writer 11,
Enter your PIN. If the personal identification numbers match, the computer 12 reads, for example, image data of a facial photograph and displays it on the monitor 14. Therefore, it is possible to reliably determine whether or not the owner of the card 10 is the person based on the face photograph. For example, it is extremely effective for confirming the identity at a credit counter of a store.

Next, a method of storing image data in an IC card will be described.

FIGS. 3A and 3B are flowcharts showing a method of storing image data.

In the case of a face photograph ((A) in the figure), the face of the person is photographed by the video camera 15 and the image data is stored in a video memory.
Store in 13.

Here, the video memory 13 has a capacity of 256 × 256 × 8 bits, and has 8 bits (256 gradations) as gradation. However, it is necessary to compress this image data in order to store it in the IC card 10 whose memory capacity is not so large. Also, 256 gradations are not necessary for the person's confirmation, and about 16 gradations are sufficient. There is also an advantage that the time required for data transmission can be shortened.

Therefore, in this system, the gradation is compressed from 8 bits to 4 bits (16 gradations), and one pixel is treated as 4 bit data in the IC.
Stored in the memory 2 of the card 10. The data compression method will be described later.

In the case of a signature / seal stamp ((B) in the figure), the image is similarly taken by the video camera 15 and the image data thereof is stored in the video memory 13.

Since the image data of the signature / seal stamp does not require gradation unlike a face photograph, the data is binarized and then written in the memory 2 of the IC card by the run length method here. The run length method will be described later.

(Data Compression Method) FIG. 4 is an explanatory diagram of the data compression method, and FIG. 5 is an explanatory diagram of gradation expression showing a dot pattern of a screen corresponding to 4-bit data.

As shown in Fig. 4, the dot composition of the facial photograph 20 is 256 × 2
There are 56 dots, and this is represented by a pixel 21 composed of 4 × 4 dots.

A pixel of 4 × 4 dots can express 16 gradations as shown in FIG. 5, and this gradation expression can be performed by 4-bit data. Therefore, 1 byte of data 22
If it is divided into lower 4 bits each, 1 pixel of data 22 can represent 2 pixels. Specifically, 256
For a face photograph of × 256 dots, it is sufficient to store 256/8 × 256/4 = 2048 bytes of data in the memory 2.

On the other hand, when reproducing a face photograph, the 1-byte data 22 stored in the memory 2 is divided into upper and lower 4-bit data, and each 4-bit data is used to monitor one pixel 21 (4
× 4 dots) is expressed. As shown in FIG. 5, since 4-bit data can express a pattern of 4 × 4 dots in 16 gradations, 1-byte data in the memory 2
This means that two pixels on the monitor can be expressed in 16 gradations.

In this way, 4 face pictures 22 consisting of 256 × 256 dots
It can be displayed on the monitor in 16 gradations with 4 x 4 dots as one pixel.

(Run Length Method) As described above, the gradation expression is not necessary in the image data of the signature or the seal stamp, and the data can be binarized and handled. Therefore, the run length method is adopted to reduce the amount of data.

FIG. 6 is a schematic diagram showing a dot configuration when image data is a signature and a seal stamp, and FIG. 7 is an explanatory diagram of an example of a run length system.

In the sign dot structure 30 and the seal stamp dot structure 31, each dot of image data is represented by 1 or 0, and 1 or 0 is often continuous. So 1 or 0
By constructing 1-byte data depending on how many are followed, the data amount can be greatly reduced.

That is, as shown in FIG. 7, of the 1-byte data, the first 1 bit (A portion) represents whether the dot is 1 or 0, and the remaining 7 bits (B portion) represent the number of consecutive dots. Represent (run length method). However, in this method, the amount of data varies depending on the image form. Here, the maximum is 1536 bytes.

By storing image data such as a facial photograph, a signature, and a seal stamp in the memory 2 by the above-described method, it is possible to significantly improve the certainty of identity verification without wasting the memory. In particular, it is certain that the person's identity is displayed by displaying a facial photograph.

In addition, in the above-described embodiment, the facial photograph is described as having gradation and the signature and the seal stamp are exemplified as being capable of being binarized. However, the present invention is not limited to these, and the data can identify the person. Any image data can be used.

[Effects of the Invention] As described in detail above, the IC card according to the present invention can identify whether or not the user is the person based on the image data, and is much more reliable than a personal identification number. You can verify your identity.

Also, since the image data is compressed and stored in the memory, the limited memory capacity of the memory can be saved.
Under the control of U, if the PINs do not match, it is prohibited to directly access the memory from the outside, so it is possible to prevent tampering with unauthorized data and enhance security.

[Brief description of drawings]

FIG. 1 (A) is a schematic configuration diagram of an embodiment of an IC card according to the present invention, FIG. 1 (B) is a schematic diagram showing its memory map, and FIG. 2 is a method of using this embodiment. FIG. 3 (A) and FIG. 3 (B) are flow charts showing a method of storing image data, FIG. 4 is an explanatory diagram of a data compression method, and FIG. FIG. 6 is an explanatory diagram of gradation expression showing a dot pattern of a screen corresponding to bit data, FIG. 6 is a schematic diagram showing a dot configuration when image data is a signature and a seal stamp, and FIG. 7 is a run length method. It is an explanatory view of an example. 1 …… CPU 2 …… Memory 10 …… IC card 11 …… Reader / Writer 12 …… Computer 13 …… Video memory 14 …… Monitor 15 …… Video camera 20 …… Face photo dot configuration 21 …… Pixel 22… … 1 byte data 30 …… Sign structure of the sign 31 …… Dot structure of the seal

Claims (1)

(57) [Claims] 1. An IC card having one memory storing a personal identification number and image data for confirming the person and a CPU for controlling data input / output of the one memory. The image data for confirming is composed of at least one image data including the image data of the face photograph among the image data requiring the tone of the image data of the face photograph and the image data not requiring the tone. And the image data that requires the gradation and the image data that does not require the gradation are stored in the one memory after being compressed by different compression methods, respectively, and stored in the one memory. When confirming whether or not the person who owns the card is the person who owns the card based on the data,
By permitting the reading of the image data stored in the one memory only when the password stored in one memory and the password of the person who owns the card match, the image data following the confirmation by the password is confirmed. If the personal identification numbers do not match, the data can be confirmed by prohibiting read / write in the data area in which the data for confirming the identity of the one memory is stored. IC characterized by being configured so that the area cannot be directly accessed from the outside
card.