JPS5884357A - Processor for magnification and reduction of picture - Google Patents

Abstract

PURPOSE:To perform a magnification/reduction process of a picture without changing the line width of the original picture pattern, by deciding whether or not the picture data which is not serving as the background within a prescribed range at a place near the coordinate position which is decided in accordance with the magnification or reduction ratio of the picture. CONSTITUTION:A control part 8 feeds the picture element position data of a picture successively to a coordinate converting part 9. The part 9 calculates the coordinates of the position corresponding to the picture element on the original picture corresponding to the picture element of an output picture in accordance with the magnification/reduction ratio of the picture. Then an approximate point inspecting part 3 decides whether or not the picture element data of the original picture which is not serving as the background exists within a prescribed distance from the position of the coordinates. Furthermore the similar inspections are carried out through a vertical line inspection part 4, a horizontal line inspection part 5 and an oblique inspection part 6 respectively. When at least one of the results of inspections obtained through the parts 3, 4, 5 and 6 is ''1'', the corresponding coordinates are set at value 1 and then delivered through an OR circuit 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an image enlargement/reduction processing device capable of preserving the pattern line width of an original image consisting of a binary image and enlarging or reducing the original image.

<Prior Art> Recently, technology for filing document images into computer systems has been developed, greatly contributing to the rationalization and labor saving of office processing. Therefore, when searching and using document images that have been converted into files in this manner, it is necessary to enlarge or reduce the original image to a desired size. Conventionally, therefore, the original image is enlarged or reduced by image processing called interpolation or projection. For example, f (= e y ) shown in $1 figure)
-(1-≦x, y<8) When obtaining an enlarged image v x 12), image processing is performed in the following manner. First, consider that the enlarged image g (uo ma) is to be reduced by + times, and the point (X・, y・)′t− −1,1 go * on the original image corresponding to the point (uo vma・) @el@ 3maO Search name. And the pixel points of the original image around this point (X eye)
*71) #(X4 t74) with [] as Gaussian symbol XI = (xe) yt = (ya)
xl+1 y Mutomi 1! 1 m: +iX 1 ya 8y
t +1X 4 :+'''X 1 + 1
Calculate as y 48x t +1. However, [X・]
indicates the largest integer value less than or equal to X. Therefore, the value g of the point (U., Ma.) is calculated by the following weighted average.
(ustma・)g(li@*we)=(X4−XI)”
(F4-Fe)"fcxl wFl)+(!@-x
1)”(F4-Fe)@/(xm *7m)+(x
a-ms)・(ye-yt)+1/(is,ys
)+(XI −xl)” (Fe −yt)”
fcxa eya). Then, this value g (11@ma・) is compared with a predetermined threshold value, for example, the value "α5", and g (u@-・)≧00.1−yield “1”<
The binarized data is determined as 0.5-→"0". Therefore, the first
The enlarged area obtained by performing such processing on the original image shown in the figure (&) is as shown in the figure (b). Further, FIG. 8 (@) is an image obtained by reducing the size of the original image t-T times by similar processing.

However, as is clear from the images shown in Figures 1 (a) to (,), in the case of enlargement 1, there are parts where the l-arm turn is thicker and parts where it is not. This results in a very unsightly appearance. Also, in a reduced image, some lines may disappear. This means that the enlargement/reduction processing is not performed while maintaining the 9-turn information of the original image, which causes a practical problem. Further, image processing that prevents cliffs from disappearing during reduction is introduced in the following documents.

1978 Society of Information and Information Technology @20th National Conference 2E-6''
Image Scaling and Scaling Bandai 2 Miyai et al. When the original image was enlarged using this kind of image processing method, there was a problem in that the line width of the parable pattern was too thick, resulting in an extremely unsightly image.' =“ <Object of the Invention> The present invention has been made in consideration of the above circumstances, and its purpose is to enlarge the original image gIt- without changing the line width of the ∆ turn figure of the original image as much as possible. Alternatively, by performing a reduction process, the characteristics of the original image can be preserved, and the enlargement/reduction process of an image with high utility can be performed.
The goal is to provide equipment.

<Structure of the Invention> The present invention calculates the coordinate position on the original image corresponding to the pixel position of the enlarged or Fi convergence small image, and calculates the coordinate position in the vicinity of the above coordinate position determined according to the enlargement or reduction ratio of the image. The data at the coordinate position is determined by determining whether or not there is image data that is not the background, and j-numbers that have signal components of the original image. For example, by setting the m1iii image value "l#" to the circumference of the line K, the enlargement/slimming ratio to p, and giving data "1" to the coordinate position corresponding to the image pixel], the original image is enlarged.・Performs reduction processing.

<Effects of the Invention> Therefore, according to the image enlargement/reduction processing device according to the present invention configured as described above, the pixels of the original image that are most closely related to the pixels of the enlarged/reduced image are processed.

Since that information will be given, what about the original image?
It becomes possible to enlarge the original image or perform small processing without causing a significant change in the turn line width and without damaging the characteristics of the original image. Moreover, image processing can be performed by determining whether or not non-background pixel data exists near the coordinate position on the original image corresponding to the pixel of the output image, and is very simple. Therefore, it has great practical advantages and effects.

<Embodiment of the Invention> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing the relationship between the pixel coordinates of the original image, the pixel-corresponding position coordinates of the T-fold enlarged image on the original image, and the pixel-corresponding position coordinates of the 1-fold magnified small image on the original image. In Fig. 2, the O mark indicates the pixel coordinates of the original image, and the X mark indicates the pixel coordinates of the original image.

3 is the pixel corresponding position coordinate of the - times enlarged image, and the mark is T
The pixel-corresponding position coordinates of the double-reduced image are shown respectively.

As is clear from the coordinate positional relationship shown in FIG. 2, a positional shift generally occurs between the pixel coordinates of the original image and the corresponding pixel position coordinates of the enlarged/reduced image. Therefore, in order to obtain each image data of the enlarged Φ reduced image, it is necessary to perform signal processing using the original image data in the vicinity by some means.

The apparatus of the present invention is capable of enlarging or reducing the image while keeping the notaturn line width approximately constant during this signal processing without impairing the characteristics of the original image gI. For example #i, Km is formed as shown in FIG.

In Figure 3, the 11th memory stores an original image consisting of a binary image that has been input or that has been subjected to 7-eye ringing in advance. The proximity point inspection unit 3. Vertical 4I inspection section 4. A horizontal drama inspection section 5 and a diagonal inspection section 6 are connected, and pixel data of the original image is transferred between them via the data path 2. Then, the test results of these test sections 3.4.5.6 are led to the logical sum circuit 7,
The image r-t is determined by the logical sum processing.

The control unit 8 sequentially outputs pixel position data (u@, ma0) of the image to be enlarged or reduced and output, and supplies this to the coordinate transformation s9. This seat 411f conversion unit 9 calculates the pixel corresponding position coordinates (x@+yo) on the original image corresponding to the pixels of the output Iji image (enlarged or reduced image) according to the enlargement/reduction ratio pK of one image, This position coordinate data (xo+yo) is sent to the inspection unit j * 4 t 5 e
6 each. The proximity point inspection unit 3 obtains the upper mr2 coordinate position data (w@vy・), and checks whether or not there exists from the above coordinate position (X・, y・), as shown in Fig. 4. Judging.

lx xel+ly ysl≦Yup (shown in the 41st medium area), and (
It is determined whether original image data f (x ey ) palm 1 exists in the 41st middle region IK). However, this judgment is! -!・E y"y・-6 coordinate position is not expanded. Also, in Fig. 4, the boundary indicated by bold @C indicates the area included in the above inspection range, and 1IA
It shows an area that is not included in the boundary inspection range indicated by IID. As a result of this test, f is within the above range.
(XIF)=When there is pixel data of the original image l, that information is strongly reflected in the coordinates (X・, 1・), then the data g(u・,ma・)−1 or the logical sum − Road IK
Output.

In part, the vertical line inspection unit 4 inspects whether there is a vertical p line component with a value of 1 (/(xty)) within a distance y from the position dust @ (X, 1). This test is
Define yl = [y・], 1 1 X・−, x≦X・+], and determine whether there is a coordinate component It will be done as follows. Then, when there is an X that satisfies the above conditions, the coordinates (x@@
y@) is a part of vertical tightening, and g(u, ma)
A test result of =1 is given to the Toriwa circuit 1.

Further, the horizontal line inspection unit 5 inspects whether a horizontal line component exists within a distance from the position coordinate (zoeyo). This test assumes that xt = (me), and f (xr ey) - f (xt + 1 ey
)=1, it is determined whether or not there is a coordinate component 1 that satisfies the condition. Then, when there is a y that satisfies the above conditions, we obtain the test result of g (sietv fist) = 1, assuming that the -S of the coordinate (X * yo) n horizontal line exists, and give this to the logical sum circuit 1. There is.

Then, in the diagonal inspection section -, the position coordinate (Xo*
y), this position coordinates (X@#y@) are determined.

This test is performed under the conditions of X1=(X・), y1=(c),
1 and satisfies the condition, f (xt + ys) - f (xs+1 * yt+
This is performed by determining whether or not the condition 1)=1 is satisfied. Then, when the above conditions are satisfied, the coordinate (xotyo) F
i As a part of the diagonal component, g(uo +Y@
)=1 is obtained, and this is fed to the OR circuit 2.

If we obtain these test parts J and test part -* in 4.5.1, and at least lg(w・ma・)=1, then the coordinates (X・,c) have the value @″l The OR circuit 1 obtains the coordinate data as having "acid content t".

It is determined that pixel data of the original image that is not the background exists in the vicinity of Image data of r-ta "al#" is given only to the pixel-corresponding coordinates.

Then, after obtaining such an image processing result, the next utility image pixel data is output in the previous 8C system # time N8. This process is repeatedly executed for all pixels forming the output image.

In this way, the logical sum circuit 7 sequentially obtains uniform data of enlarged or reduced images.

Therefore, due to such image processing, the defects are enlarged or reduced, and the pattern line width of the nine strokes becomes unnecessarily thick.)
Or, the problem of disappearing does not occur. That is, a non-background pixel r that exhibits the characteristics of the original image is always reflected in the coordinate position corresponding to the output pixel in its vicinity. Moreover, since the pixel data is determined according to the connection relationship (vertical line, horizontal line, diagonal line) of the coordinate data, the characteristics of the lean figure of the original image are always reflected. Furthermore, the above characteristics are reflected in the corresponding position coordinates of the pixel in the closest positional relationship, J. Therefore, the pattern line width does not change much as the image is enlarged or reduced, and it is possible to perform particularly good enlargement/reduction processing on the original image. Moreover, as mentioned above, the inspection process is easy and
The 4% advantage in terms of device construction is significant.

<Another Embodiment of the Invention> By the way, in the above-mentioned embodiment, if the original image is a small turn, where pixels are connected in the vertical direction, horizontal direction, and diagonal direction, it is a w8 connected/small turn. The device is configured for

Therefore, in the case of an n4 connected pattern that has pixel connections only in the vertical and horizontal directions,
The apparatus can be configured by omitting the above-mentioned good diagonal line inspection section. In this case, the neighboring point inspection unit 3 may be configured to judge the existence of rmxy''-y for the range .Furthermore, the vertical line and horizontal line inspection units may be configured to judge the existence of rmxy''-even within the range. , so that t-executes. That is, when performing reduction processing for one lotus, it is not necessary to inspect vertical lines and horizontal lines. Even in this case, the same effect as the previous embodiment can be achieved in the case of four turns and two turns.

Note that the present invention is not limited to the above embodiments. In short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of the drawing]

Figures 1 (a) to (,) are diagrams schematically showing the enlargement and reduction of an image using a conventional device, and Figure 2 is a diagram showing the enlargement and reduction of the original image and the 1m1A corresponding position coordinates of the small image. FIG. 333 is a schematic configuration diagram of the apparatus according to the embodiment of the present invention, and FIG.
The figure is a diagram showing the concept of nearby point detection. 1... Image memory, 2... Data bus, 3... Proximity point inspection section, 4... Vertical line inspection section, 5... Horizontal line inspection section. 6... Oblique line inspection section, 1... OR circuit, 8... Control section, 9... Coordinate conversion section. Applicant's agent: Patent Attorney Dosu Takeshi E 5 Figure 1 (a) (b) (c) Figure 2

Claims (1)

[Claims] A position calculation circuit that calculates the coordinate position of the human image corresponding to the iii position of the output image that is enlarged or reduced and outputted according to the enlargement/reduction ratio of the MR image, and The present invention is characterized by comprising a test circuit for detecting whether or not input image pixel data other than the background exists, and means for determining pixel data at the pixel position of the output image according to the test result of the test circuit. Image scaling processing device.