JPS59112365A - Compressing method of image data - Google Patents

Abstract

PURPOSE:To register the data of a seal to be registered efficiently by compressing image data in an image existing area detected by an image data size detecting device and segmenting the compressed data to stored the data in an image file together with an address. CONSTITUTION:When the operator inputs the account No. of a registered slip 10 from a keyboard 20, the sealing of the slip 10 is photoelectrically converted and the image data are entered in an image buffer 12. The data in the buffer 12 are preprocessed by a preprocessing circuit 13 to extract a seal image existing area and send and store the extracted area to/in a seal image size storing part 14. An address conversion part 16 reads out the size lx, ly of the seal image from the storing part 14, calculates the original point Ao in the storing area of the image data from the data of the center point C of a memory 17 of an already stored seal, transfers the image data to the memory 17, and then enters Ao, lx, ly in a segmented address part 18. Thus, the effective data are compressed and sent from a transmission part 21 to the center.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an image data compression method.9 For example, in order to efficiently register the image data of a registered seal for seal stamp verification, only the effective area of the image data is transmitted. Regarding what you can select and send.

Prior Art and Problems When registering a seal, the registered seal is pressed in a frame F, as shown in FIG. Therefore, within the frame F, there are blank areas Po, P where no seal impression exists, and data areas P where there is a seal impression.
, there is. Conventionally, when registering such image data in the center file, the blank areas Po, P
2 was also stored in the file along with the data area P1.

Therefore, even if the data to be stored is stored as compressed data using the run-length method, the amount of data is large, and the center file therefore requires a large-capacity lid.

Conventionally, when registering a seal, as shown in FIG. remember. The data is then compressed by the compression unit 4. This compressed image data is sent to the center from the transmitter 6 along with the account number separately input from the keyboard 5, and is stored in the center file 7. For example, when a seal stamp verification is required, the registered seal imprint is output using the account number, etc. as a key, and the verification process is controlled.

Even if the data is compressed and stored in the compression unit 4, the amount of image data to be registered is much larger than in normal code processing because the blank areas Po and P2 in Figure 1 are quite large. Therefore, the center image file must have a fairly large capacity to be of practical use. However, currently there are only a certain number of image files, and users are required to consider how to use them effectively.

OBJECTS OF THE INVENTION An object of the present invention is to efficiently store image data that includes such blank areas by selecting and transmitting only valid portions of the image data. The purpose is to provide a compression method.

Structure of the Invention In order to achieve this object, the image data compression method of the present invention reduces the size of the data existing area of image data in a system that compresses image data and stores it in an image file together with identification information of the image data. An image data size detecting means for detecting, a cutting address creating means for creating a cutting address such that the image data is located at the center of a reading section when reading the image data, and a data compressing means for compressing the data. The present invention is characterized in that the image data of the image existing area detected by the image data size detection means is compressed data, and the compressed data is stored in an image file together with a cutting address.

Examples of the invention Before describing the present invention in detail based on one embodiment.

The principle of operation will be explained based on FIG. In the present invention, for example, when registering a seal, there is an image existing area where the seal is imprinted in the frame F indicating the seal position.

and a blank area. and creates only the data within the image existing area Di as compressed data. Then, when this seal impression is moved to the center position within the frame F, the first point A of the image existing area is.

(referred to as the cutting point) coordinate data (XA+3'A)
The compressed data and the coordinate data of this cutout point are sent to the center and filed.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 8 and other figures as necessary.

FIG. 4 is a block diagram of one embodiment of the present invention, FIGS. 5 to 7 are explanatory diagrams of its operation, and FIG. 8 shows transmission data that should not be stored in the center file.

In the figure, 10 is a registration slip, and 11 is a photoelectric conversion unit.

12 is an image buffer memory, 13 is a preprocessing circuit, 1
4 is a seal imprint size storage section, 15 is a verification stamp memory, 16 is an address conversion section, and 17 is a registration stamp memory.

18 is an extraction address storage section, 19 is an effective data compression section,
20 is a keyboard, and 21 is a transmitter.

The photoelectric conversion unit 11 reads the image data of the registration slip 10 and converts it into an electrical signal, and includes a lens, a photoelectric conversion element, and the like.

The image buffer memory 12 stores multiple values (
For example, image data of a registration slip read in 16-value format is stored.

The preprocessing circuit 16 converts the multi-valued data stored in the image buffer memory 12 into four-valued or binary data, and also converts the area where the image data exists using the projection method shown in FIGS. 5(a) and 5(b), for example. This process performs frame cutting processing. After converting the multivalued data stored in the image buffer memory 12 into binary data, the data is scanned within the frame F in the direction of the arrow using a 1-bit wide window Wx or WY as shown in FIG. When scanning in the X-axis direction (horizontal) of the arrow with the window WX, if even 1 bit of image data exists in this window Wx, "1" is written in the corresponding X-axis section of the register RX.
", and if even 1 bit of image data exists in window WY when scanning in the Y-axis direction (vertical) of the arrow in window WY, "1" is written in the corresponding YIII1 section of register R.
”. By doing this, Figure 5 (I
As shown in K, the area where the seal impression exists is X1 to x2 in the X coordinate.
It is an area of +Y coordinate y, ~y, and its length J in the X coordinate direction is (X2X1), and the length l in the y coordinate direction is (y, -y,). . In this way, the image existing area can be determined by projection in the X and Y directions.

The seal imprint size storage unit 14 stores the size of this image existence area, that is, the above-mentioned 1x, l, and its existence area (xl, yl
), (x2.yl).

The verification mark memory 15 is a memory in which image data obtained by converting the multi-valued data obtained from the image buffer memory 12 into four-valued data is set.

The address converter 16 transfers the image data read into the image buffer memory 12 to the registration mark memory 17 via the verification mark memory 5, as shown in FIG. It is necessary to transfer this seal impression to the center of the registered seal memory 7 for reasons such as displaying it. For this purpose, when transferring the image data to the registration mark memory 7, the first dot in the storage area of the data is calculated.
Let the coordinates of the center point C of 7 be (Xc+yc), and the size of the image existing area is M, then the coordinates of point M are xAIy
A can be obtained as shown in the following equations.

xA-xclx A, -9°- Ma However, the 0 point in FIG. 6 is taken as the origin.

From this, the address of the valid data portion of the registered mark memory 7 can be obtained.

The cutout address storage section 18 is a valid data section in the registered stamp memory 7 obtained in this manner.

In other words, Ao (XAI YA) regarding the data storage area
+Zx +4.

The valid data compression unit 19 creates compressed data by compressing the image data in the valid data section set in the registration mark memory 17 by, for example, a run-length method.

The transmitting unit 21 receives the account number input from the keyboard 20 and the cut-out address data transmitted from the cut-out address storage unit 18, that is, Ao (XAI yA) + lx.
+1 and the compressed image data transmitted from the effective data compression unit 19 are sent to a center (not shown) in the format shown in, for example, FIG. 8, and are stored in a file at the center.

Next, the operation of the registration mark reading/transmission verification device shown in FIG. 4 will be briefly explained.

(1) When registering a seal, the customer affixes the registered seal and writes the account number in a predetermined position, that is, within the frame, on the registration slip 1o. The operator sees this and inputs the account number from the keyboard 20, and also photoelectrically converts the stamp on the registration slip 10 in the photoelectric converter 11 to generate 16-value image data, which is written into the image buffer memory 12.

(2) The image data set in the image buffer memory 12 is first converted into 4-value and 2-value data by the preprocessing circuit 16, and the 4-value image data is transferred to the verification mark memory 15. Based on the image data converted into binary values, the preprocessing circuit 16 performs the following processing in FIG.
As shown in (b), extract the area where the seal impression exists and +l
x (xi, X2) + ly (Ys + yl)
seek. And these 11 (XI + X2)
+7? F O'+ + Y2) is the stamp size storage section 1
4 and held.

(3) The address conversion unit 16 is the stamp size storage unit 14
to these (Xl + X2) + lY (Y+
+yz).

Also, the center point C (
From the data of xc, yc), the first dot (XAT) of the image data storage area in the registered mark memory 17 is
yA, ), thereby transferring the image data held in the verification mark memory 15 to the registration mark memory 17, and at the same time calculating the above Ao (XAI
yA) +mu (X2 XI), ly (y2M+)
Enter.

(4) Image data written in registered stamp memory 17
In the evening, the data is compressed by the effective data compression section 19.

(5) The transmitting unit 21 transmits the account number transmitted from the keyboard 20, Aa, &, z transmitted from the extraction address storage unit 18, and the image data transmitted from the effective data compression unit 19, for example. The data is formatted as shown in FIG. 8 and sent to a center (not shown). As a result, the data in the image existing area where image data exists is stored in the center file as, for example, four-value data, and the data in the blank area is stored as cutout address data, greatly reducing the overall amount of data. can do. After registering, of course.

When reproducing through search, etc., the image data can be expanded by referring to the cutout address data.

In the above description, the case of seal registration was used as an example, but the present invention is of course not limited to this.

Effects of the Invention According to the present invention, 2. For example, the blank area that occurs when registering a seal is removed and only the image existing area is registered as image data, and the blank area is registered as cutout address data, so the total amount of data can be reduced. It can be made very small. Therefore, the center image file can be used effectively.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the problems of conventional registered seals, Fig. 2 is an explanatory diagram of the conventional seal registration system, Fig. 6 is a detailed explanatory diagram of the present invention, and Fig. 4 is an embodiment of the present invention. Configuration diagram, Figures 5 to 7
The figure is an explanatory diagram of its operating state. FIG. 8 is an example of a transmission data format. In the figure, 10 is a registration slip, and 11 is a photoelectric conversion unit. 12 is an image buffer memory, 13 is a preprocessing circuit, 1
4 is a seal imprint size storage section, 15 is a verification stamp memory, 16 is an address conversion section, and 17 is a registration stamp memory. 18 is an extraction address storage section, 19 is an effective data compression section,
20 is a keyboard, and 21 is a transmitter. Patent applicant Fujitsu Ltd. Representative Patent Attorney Akira Yamatani

Claims (1)

[Scope of Claim] A system for compressing image data and storing it in an image file together with identification information of the image data, comprising: an image data size detection means for detecting the size of a data existing area of the image data; It has a cutout address creating means for creating a cutout address such that the image data is located at the center of the reading section when outputting the image data, and a data compression means for compressing the data. An image data compression method characterized in that the image data of the image existing area detected by the image data size detection means is compressed data, and the compressed data is stored in an image file together with a cutting address.