JPH0374992B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image reduction control method, and particularly an image reduction control method that controls the reduction of image data such as figures expressed using dots in a manner close to the original image data. It is about the method.

[Problems to be solved by conventional technology and invention]

Conventionally, when a figure, etc. is scanned using a scanner and converted into image data consisting of dots, and the data is reduced to one-eighth, for example, the image data is scanned using a scanner, and the image data is converted into image data consisting of dots. For example, each address is divided into
Image data was obtained by extracting only the MSB value in a fixed manner and reducing it as shown in FIG.
Therefore, the problem is that the image data reduced to one-eighth is determined only by the fixedly extracted MBS value, and the image data becomes far different from the image data before reduction. It was hot. In particular, if there are thin lines in the original image data, the thin lines will be thinned out in the image data after reduction, resulting in a flat image and the original image shape. The problem was that it became difficult to understand.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an image reduction control method for reducing image data of a figure represented using dots, in which the image data is reduced in accordance with a reduction ratio at which the image data is to be reduced. When the number of black dots and white dots in the divided image data divided by the image data division means and the image data division means is within a predetermined intermediate range, this is determined using another predetermined criterion value. A determination means for dividing the reduced image data into black dots or white dots, and a determination criterion value to be applied to successive segmented image data in a direction that reverses the determination result based on the criterion value applied to the immediately preceding segmented image data. The present invention is characterized in that it includes a correction means, and generates the judgment result of the judgment means as reduced image data.

〔Example〕

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

FIG. 1 is a configuration diagram of one embodiment of the present invention, FIGS. 2 and 3 are operation explanatory diagrams explaining the operation of the configuration of one embodiment of the present invention illustrated in FIG. 1, and FIG. 4 is a diagram of the configuration illustrated in FIG. 1. Example of configuration of a device using the configuration of the first embodiment of the invention, No. 5
6 and 6 show operation explanatory diagrams for explaining the operation of the configuration example shown in FIG. 4.

In the figure, 1 is an image data division means, 2 is a reduced image data generation means, 3 is a control section, 3-1 is an image data reception section, 3-2 is an image data editing section, 3-3 is an image data control section, 3-4
is an input/output control unit, 3-5 is an image data output unit, 4 is a display, 5 is an image reader, 5
-1 is an image input device, 5-2 is an image reader drive unit, 5-3 is an image reader control unit, 5-
4 represents an image memory section, 5-5 an image data transfer control section, 6 a magnetic disk, and 7 a printer.

FIG. 1 shows a means for generating image data reduced to one-eighth using a flowchart.

The image data sorting means 1 shown in the figure is carried out by the procedure shown in 1 in the figure. That is, in this embodiment, in order to reduce the image to one-eighth, 1 in the figure shows a state in which 1 byte (8 dots) of the original image data before reduction is loaded into the register. In other words, it shows a state in which the original image data is divided into 1-byte portions and sequentially loaded into the corresponding register. The one-byte image data loaded into the register is sequentially generated in the form of reduced image data consisting of one dot.

In the figure, the reduced image data generation means 2 is 2 in the figure.
It is carried out by a procedure consisting of 9 to 9. This will be explained in detail below.

2 in the figure shows a state in which it is checked how many black bits there are in one byte. This means calculating how many bits correspond to black, ie, the black part of the figure, in one divided byte.

3 in the figure shows a state in which it is determined whether the number of black bits calculated in 2 in the figure is greater than or equal to a predetermined judgment reference value x. If YES, execute steps 4 and below in the diagram.
If NO, execute steps 7 and below in the diagram. here,
The judgment reference value x has a value between the lower limit value "a" of the slice level and the upper limit value "b" of the slice level. For example, when reducing the size to one-eighth as in this embodiment, These are predetermined values such that the lower limit and upper limit of the slice level are "2" and "6", respectively.

4 in the figure shows a state in which the bit to be judged is black. This means that the number of black bits calculated in step 2 in the figure is determined to be greater than or equal to the criterion value x in step 3 in the figure, so the bits for the reduced image data are determined to be black.

5 in the figure shows a state in which it is determined whether the value of the judgment reference value x used in 3 in the figure is larger than the upper limit value "b" of the slice level. In the case of YES, the reduction process for 1 byte loaded in step 1 in the figure is completed without increasing the value of the judgment reference value x. NO.
In this case, the value of the judgment reference value x is increased by "1" at 6 in the figure. As a result, the proportion of continuous images determined to be black is controlled to be small, so that it is possible to prevent so-called flat image data after reduction from being obtained.

In the figure, 7 indicates a state in which the bit to be determined is white. This means that the number of black bits calculated in step 2 in the figure is determined to be less than or equal to the criterion value x in step 3 in the figure, so the bits for the reduced image data are determined to be white. .

8 in the figure shows a state in which it is determined whether the value of the judgment reference value x used in 3 in the figure is smaller than the lower limit value "a" of the slice level. In the case of YES, the reduction process for 1 byte loaded in step 1 in the figure is completed without reducing the value of the judgment reference value x. NO.
In this case, the value of the judgment reference value x is decreased by "1" at 6 in the figure. As a result, the ratio of continuous determination of white is controlled to be small, so that it is possible to prevent so-called flat-looking reduced image data from being obtained.

Next, the operation of the configuration shown in FIG. 1 will be explained in detail using FIGS. 2 and 3.

Each 8-bit image data shown divided into addresses 0000 to 0007 in FIG. This is an extracted version. The eight categories were divided into the following:
In order to reduce the original image data to one-eighth, each divided image data is weighted, and reduced image data is generated based on the relationship with each adjacent divided image data. This is done for the purpose of The details will be explained below.

In the "Number of Black" column indicated by 11 in the figure, the number of black (number of "1") included in each 8-bit image data divided into addresses 0000 to 0007 is shown.
is displayed. This is carried out at 2 in FIG.

In the "judgment level" column indicated by 12 in the figure, the value of the reference value x in FIG. 1 is displayed.
The value of the judgment reference value x has, for example, a value between the upper limit value a and the lower limit value b of the slice level, and when a black or white judgment is made, as explained in 6 or 9 in FIG. Thus, the values are controlled to increase or decrease by 1. This reduces the probability that black or white will appear consecutively in the image data after reduction, and is controlled so that fine images are more likely to be displayed.

In the “Judgment” column indicated by 13 in the figure, the first
As explained in 4 and 7 in the figure, “judgment level”
It is determined as "black" or "white" depending on whether the "black number" (11 in the figure) is larger or smaller than (12 in the figure).

The result obtained by the determination (13 in the figure) is that the 64-bit image data shown in FIG. 2 is reduced to the 8-bit image data shown in FIG. 3. In the figure, "1" indicates black and "0" indicates white.

FIG. 4 shows an overall configuration diagram of an apparatus using the configuration shown in FIG. 1. The image reader 5 in the figure is for converting figures etc. into image data consisting of dots. The image data converted by the image reader 5 is supplied to the control unit 3, and the image data reduced to, for example, one-eighth by means as shown in the flow chart shown in FIG. 1 is stored on the magnetic disk 6. be done. Further, the reduced image data is printed on paper by the printer 7 as necessary.

Next, the operation of the configuration shown in FIG. 4 will be explained in detail using FIGS. 5 and 6.

A document is set on the image input device 5-1 constituting the image reader 5 in FIG. As a result, the image reader driving section 5-2 scans the document based on a command from the image reader control section 5-3, generates unreduced image data composed of dots, and generates unreduced image data from the image memory section 5-3. 4
Temporarily store it in . The stored image data is sequentially read out and transmitted by the image data transfer control section 5-5. The transmitted image data is then received by the image data receiving section 3-1 constituting the control section 3, and is then received by the image data editing section 3-2 and the input/output control section 3-1.
4 and stored on the magnetic disk 6. At this time, the image data editing section 3-2 reduces the image data by means as shown in the flowchart of FIG. 1, if necessary.
The reduced image data etc. stored in the magnetic disk 6 are transmitted to the display 4 via the input/output control section 3-4 and the image data output section 3-5.
or printed using the printer 7. The various processes executed by the control section 3 are executed sequentially based on commands from the image data control section 3-3.

FIG. 6 shows the flow of control executed within the control section 3.

Reference numeral 14 in FIG. 6 indicates a state in which buffer control is performed. This means defining an area of buffer memory to be used for editing.

In the figure, 15 indicates a state in which window control is performed. This means defining the reference point and size of the output window.

In the figure, reference numeral 16 indicates a state in which printer out control is performed. This means specifying the output control mode of the printer.

In the figure, 17 indicates a state in which an image data stream is performed. This involves firstly analyzing each order (command, etc.), secondly reading the image data, and thirdly the means shown in the flowchart shown in Figure 1 corresponding to the thinning rate (reduction rate). This means editing (generating) the reduced image data according to the above, and fourthly, saving (storing) the edited image data on the magnetic disk 6.

In the figure, 18 indicates a state in which make-up image data is performed. This means reading the edited image data from the magnetic disk 6 and outputting it to the specified window.

In the figure, 19 indicates a printing state. this is,
This means printing out image data on paper.

With the configuration and operation described above, the image data read by the image reader 5 is reduced at a desired reduction ratio, and the reduced image data well represents the characteristics of the original image data before reduction. will be printed out.

〔Effect of the invention〕

As explained above, according to the present invention, when reducing image data such as figures represented using dots, the image data before reduction is divided into predetermined bits, and images existing within the division are Since the data is combined into a so-called weighted black and white judgment, and the relationship between the adjacent sections is also taken into consideration to generate image data for each dot after reduction, the original image It is possible to obtain reduced image data that is close to the original data. In particular, when thin lines exist in the original image data, the probability that the thin lines will be thinned out in the reduced image data is reduced, and image data that is well-defined and easy to see can be obtained.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of one embodiment of the present invention, FIGS. 2 and 3 are operation explanatory diagrams explaining the operation of the configuration of one embodiment of the present invention illustrated in FIG. 1, and FIG. 4 is a diagram of the configuration illustrated in FIG. 1. Example of configuration of a device using the configuration of the first embodiment of the invention, No. 5
6 and 6 are operation explanatory diagrams for explaining the operation of the configuration example shown in FIG. 4, and FIGS. 7 and 8 are operation explanatory diagrams for explaining the operation of the conventional image reduction control method. In the figure, 1 is an image data division means, 2 is a reduced image data generation means, 3 is a control section, 3-1 is an image data reception section, 3-2 is an image data editing section, 3-3 is an image data control section, 3-4
is an input/output control unit, 3-5 is an image data output unit, 4 is a display, 5 is an image reader, 5
-1 is an image input device, 5-2 is an image reader drive unit, 5-3 is an image reader control unit, 5-
4 represents an image memory section, 5-5 an image data transfer control section, 6 a magnetic disk, and 7 a printer.

Claims (1)

[Claims] 1. An image reduction control method for reducing image data of a figure represented using dots, comprising: image data partitioning means for partitioning the image data in accordance with a reduction ratio at which the image data is to be reduced; When the number of black dots and white dots in the segmented image data segmented by the means is within a predetermined intermediate range, this is separated as black dots or white dots in the reduced image data using another predetermined criterion value. A determination means is provided, and a means for correcting the determination reference value applied to successive segmented image data in a direction that reverses the determination result based on the determination reference value applied to the immediately preceding segmented image data, An image reduction control method characterized by generating a result as reduced image data.