JPH04147386A - Image processing method - Google Patents

Abstract

PURPOSE:To shorten time required for image conversion processing by providing an address corresponding to each of a density conversion parameter and a size of original image data with a table where a value of the size of image data whose density has been converted is stored in advance. CONSTITUTION:When a value of density conversion parameter and a file name of original image are externally input to a control section 4, the control section 4 can extract a relevant size of original image from a function parameter storage section 5. The control section 4 uses a size of original image and density conversion parameter to refer to a memory address of in a density conversion table 6 where a relevant size of original image to be converted is in store, and reads a size of converted image from this memory address, and provides a density conversion processing section 1 with a file name of original image and its size, thereby making the density conversion processing section 1 possible to carry out density conversion processing. For this reason, image data of converted image density can be obtained in a short period of time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image processing method, and in particular, performs density conversion processing of an original image stored as image data to generate density-converted image data. Regarding image processing methods.

[Conventional technology]

Conventionally, this type of image processing method acquires image data from an image acquisition device (not shown) and stores it in an original image data storage unit 2, as shown in FIG. 4 as an example of the configuration as a block diagram. At the same time, the size of the original image, that is, the maximum number of pixels in the vertical and horizontal directions of the original image, is stored in the functional parameter storage unit 5 in association with the file name of the original image. When the control unit 4 receives an image processing command including the file name of the original image and the density conversion parameter from the keyboard, the size of the original image corresponding to the file name of the original image is stored in the function parameter storage unit 5 under the control of the control unit 4. Read more.

Note that the density conversion parameter is a constant number, for example, 16
The value obtained by dividing . Further, the density conversion rate is a value representing a ratio indicating how many times the size of the image to be converted is enlarged relative to the original image.

The control unit 4 calculates the density conversion rate from the density conversion parameter.If the given density conversion parameter is 8, the density conversion rate=18/8, that is, 2. Subsequently, the control unit 4 calculates the size of the converted image from the size of the original image and the above-mentioned density conversion rate. If the horizontal size of the original image is 200, that is, the number of pixels is 200, the vertical size is 300, and the density conversion rate is 2 as described above, then the horizontal size and vertical size of the converted image are The sizes in the directions are 400 and 800, respectively.

The control unit 4 gives the density conversion processing unit 1 the above-described density conversion rate and the values of the sizes of the original image and the converted image to start the density conversion process. The density conversion processing unit 1 takes in original image data for 300 sizes in the vertical direction and 200 sizes in the horizontal direction from the original image data storage unit 2, performs density conversion processing, and stores the converted image data in the density-converted image data storage unit. 3 and store it.

For example, when a printing designation command is input from a keyboard (not shown), the control unit 4 prints the converted image data using a printer (not shown) in accordance with this designation command. It will be printed.

Note that the density conversion processing unit 1 has a density conversion rate of, for example,
If it is larger than 1, the number of pixels corresponding to the enlargement rate is additionally inserted at appropriate positions between the pixels composing the original image data, and the value of the additionally inserted pixel is determined by the value adjacent to the original image to be inserted. It is processed and determined by a program installed in the density conversion processing unit in advance, taking into consideration the value of the pixel.

Furthermore, when the density conversion rate is less than 1, the density conversion processing unit 1 erases appropriate pixel components from among the pixels of the original image data according to the value of the density conversion rate. In this case, which pixel component is to be erased is determined in advance by a program included in the density conversion processing section 1, taking into consideration the pixel values of the original image data and their distribution.

[Problem to be solved by the invention]

In the conventional image processing method described above, it is necessary for the control unit to perform calculations to determine the size of the image to be converted based on the size of the original image and the density conversion parameter.

Since the above calculation is a product or quotient calculation, this calculation requires a lot of time. Therefore, a command for instructing image conversion is given to the control unit 4 via an input unit (not shown), and then the desired image conversion is performed. Since it takes a long time for the density conversion processing of the image to start in the density conversion processing section 1, the density conversion processing of the desired image data is completed after the control section 4 receives the above-mentioned image conversion processing command. The drawback was that it took a long time to complete.

An object of the present invention is to provide a table in which the size of image data after density conversion is stored in addresses individually corresponding to density conversion parameters and the size of original image data, and to perform density conversion of image data. By referring to this table before carrying out the processing, the control unit does not need to calculate the size of the image to be converted by reading the size of the image to be converted from this table. An object of the present invention is to provide an image processing method that can shorten the time required from issuing a command for image conversion processing to performing a required image conversion compared to conventional image processing methods of this type.

[Means to solve the problem]

The image processing method of the present invention acquires and stores original image data from the outside, and also stores the file name of the original image data in correspondence with the size of the original image, and stores the file name of the original image data in correspondence with the size of the original image. density for outputting image data obtained by converting the original image data into an image density corresponding to the density conversion parameter when one of the different density conversion parameters and the file name of the original image data are specified; In the image processing method including a conversion processing section, the density conversion processing section receives as input the original image data, the size of the original image data, the specified density conversion parameter, and the size of the image data after image density conversion. and a density conversion table that stores in advance a value of the size of the image data after density conversion to be input by the density conversion processing unit at an address corresponding to the size of the original image and the density conversion parameter. It is said that

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams of the stored contents of an embodiment of the density conversion table described in the embodiment of FIG. 1.

The density conversion processing section 1, the original image data storage section 2, the image data storage section 3 after density conversion, and the functional parameter storage section 5 in FIG. Since it is the same as the one with the same name in the block diagram of the data processing method, further explanation will be omitted.

The density conversion table 6 is a density conversion parameter assumed in advance (in Fig. 2, an arithmetic progression from 4 to 32 with an arithmetic difference of 1)
Separately block storage space 1. Block 2. . . , is divided into 29 areas such as block 29.

Each of these blocks is referred to by the control unit 4 when, for example, block 1 has a density conversion parameter value of 4 when converting the image density.

Figure 3 shows block 1 (density parameter 4) shown in Figure 2.
This figure explains the details of the contents of block 2 (corresponding to density parameter 5) and block 2 (corresponding to density parameter 5), and each block from 1 to 29 shown in Fig. 2 is divided into storage areas of 16 bits each. each has one memory content,
1 described above in order of size from smallest to largest corresponding to each image size of the original image.
Each 6-bit storage area has data from O to IFFH (hereinafter,
(H at the end represents a hexadecimal number) is given.

The 16-bit storage area mentioned above, for example, block 1
The 16-bit storage area at memory address 0 stores the converted image size when the original image size is 8 and the density conversion parameter is 4, that is, the density conversion rate is IE3/4 = 4. 8X4=32 (0020H in hexadecimal) is stored in advance.

The original image size in FIG. 3 is given as an arithmetic progression of 8, starting with 8H and ending with 1000H. Therefore, the density conversion parameter, for example, N (N is an integer from 4 to 32
) is given, density conversion table 6
The memory address at the beginning of the block where the required numerical value in , that is, the value of the size of the image after conversion is stored, is given by (N-4)×200H. Next, the value of the size of the image to be converted is stored by adding the value obtained by dividing the size of the corresponding original image by 8 minus 1 to the value of the above-mentioned first memory address. The value of a memory address can be determined. That is,
If the value of the density conversion parameter and the file name of the original image to be converted are input to the control unit 4 from the outside, the control unit can retrieve the size of the corresponding original image from the function parameter storage unit 5. The unit 4 uses the size of the original image and the density conversion parameter to refer to the memory address in the density conversion table 6 in which the size of the image to be converted is stored, and performs the conversion from this memory address. By reading out the value of the size of the subsequent image and giving it to the density conversion processing section 1 along with the file name and size of the original image, the density conversion process can be performed.

In the embodiments of FIGS. 2 and 3 described so far, the original image size is an arithmetic progression of 8 from 8H to 100OH, and the density conversion parameter is an arithmetic progression of 8 from 4 to 32.
However, the size of the original image and the density conversion parameter are not limited to these values;
Make appropriate settings as necessary, and set the size value and memory address for the appropriate converted image in advance according to the original image size value and density conversion parameter value that have been set. , may be stored in the density conversion table 6.

Furthermore, in the above explanation, the storage capacity of each memory address in the density conversion table 6 is set in units of 16 bits, but it is not limited to 16 bits, and can be set according to the value of the size to be stored. It is clear that it can be done.

〔Effect of the invention〕

As explained above, according to the present invention, the value of the size of the converted image is stored in advance for each memory area subdivided according to the original image size in the block of the density conversion table divided according to the density conversion parameter. Then, when the file name of the image to be density-converted and the density conversion parameter are given, the size of the converted image is calculated from the density conversion table according to the size of the original image and the value of the density conversion parameter. Since it is possible to calculate the image density and start image processing in a shorter time than with the conventional image processing method, it is possible to convert the image density in a shorter time after inputting an image conversion request instruction than with conventional image processing methods of this type. It has the effect of being able to obtain data.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams of the storage contents of an embodiment of the density conversion table described in the embodiment of FIG. 1, and FIG. 4 is a conventional diagram. FIG. 2 is a block diagram showing an example of this type of image processing method. DESCRIPTION OF SYMBOLS 1...Density conversion processing unit, 2...Original image data storage unit, 3...Image data storage unit after density conversion, 4...Control unit, 5...Function parameter storage unit, 6. ...Density conversion table.

Claims (1)

[Claims] Acquire and store original image data from the outside, store the file name of the original image data in correspondence with the size of the original image, and store the file name of the original image data in correspondence with one of one or more different density conversion parameters set in advance. In the image processing method, the image processing method includes a density conversion processing unit that outputs image data obtained by converting the original image data into an image density corresponding to the density conversion parameter when the file name of the original image data is specified. The processing unit receives as input the original image data, the size of the original image data, the specified density conversion parameter, and the size of the image data after image density conversion, and corresponds to the size of the original image and the density conversion parameter. An image processing method comprising: a density conversion table that stores in advance a value of the size of image data after density conversion to be input by the density conversion processing unit at the assigned address.