JP2575110B2 - Image composition method - Google Patents

Description

The present invention relates to an image synthesizing method.

[Prior Art] Conventionally, as a method for smoothly combining two television images without incongruity compared with inset synthesis, Japanese Patent Laid-Open Publication No.
As described in Japanese Patent Application Laid-Open No. 52-106625, this is an analog signal that changes the mixing ratio of two images according to the position of an image after synthesis, and according to the level of a control signal generated continuously for one screen. Then, the output level of each of the two images is adjusted (for example, the output at a predetermined position of the image A is set to a, the output at the same position of the image B is set to b, and the mixing ratio is A: B = 2). : 8, the output of the composite image at the same position is a
× 0.2 + b × 0.8).

However, in order to perform image synthesis using the above method, an analog control signal for indicating the output level of each image to be synthesized is formed, and two images of each image are formed for each pixel according to the formed analog control signal. Since the output level is adjusted and the adjusted image signals are added to form a composite image, the circuit configuration is complicated.

[Purpose] It is an object of the present invention to provide an image synthesizing method that eliminates the above-mentioned disadvantages of the conventional example and removes a sense of discomfort at a joint.

<Example> An example of the present invention will be described below with reference to the drawings.

Now, consider a joint between the image A and the image B as shown in FIG. At this time, the overlapping portion 1c of the images A and B is provided at this joint. Here, for the sake of explanation, it is assumed that the data is output using the systematic dither method. In addition, the dither matrix of the double-sided image has a size of 4 × 4. 2a to 2d in FIG. 2 are examples of output by the dither method. Now, consider a group 3 (corresponding to the processing block of the present invention) in which the matrices 2a to 2d surrounded by the thick frame in FIG. Also, the inside of the overlapping portion 1c is, for example, 4a to 4 in FIG.
Divide into three as in 4c.

The portion 5 in FIG. 3 corresponds to the portion 1a in FIG. Here, since only the image A is output, the entire matrix outputs and records the image data at the corresponding position of the image A as shown in FIG. Next, in the portion 4a of FIG. 3, the ratio of the image data of the image A to the image data of the image B is 3: 1. Therefore, as shown in FIG.
For one of the matrixes, the image data at the corresponding position of the image B is output and for the other three, the image data at the corresponding position of the image A is output and recorded. Thus the third
Similarly to FIGS. 4b and 4c, the ratio of the image data of image A to the image data of image B is 2: 2 in 4b and 1: 3 in 4c, as shown in FIGS. 4 (c) and 4 (d). To achieve this. The portion 6 in FIG. 3 corresponds to the portion 1b in FIG. 1, and the image data of the image B is output as shown in FIG.

An embodiment for realizing this will be described with reference to FIGS. FIG. 5 is a block diagram of an embodiment of the present invention. Image data A and B are image A memory 12 and image B memory 13, respectively.
Is stored in The reading of the pixel data of the image data is performed by the address counter 10 for the image A and similarly by the address counter 11 for the image B, and is performed in the pixel order of the output image. The outputs of the images A and B memories 12 and 13 are input to the selector 14 and are selected by the SEL signal of the controller 15 to output one of the pixel data. The SEL signal is a 1-bit signal, and the selection circuit outputs the image A memory output when the SEL signal is 1, and outputs the image B memory when the SEL signal is 0. This output is a dither processing circuit
Output to the printer 17 via 16.

 Now, the operation of the controller 15 will be described below.

Now, as shown in FIG. 6, the position of the image is positioned using the coordinates i and j with respect to the image overlapping portion shown in FIG. i, j are read from memory in the direction of the arrow,
Let it be output. In other words, for i, first read from js, read to je, then move to i, and read j in the same way. The first image read out of the overlapping portion is pixel 101, that is, (is, js), and the last pixel read out is pixel 102, that is, (ie, je).

Next, a subroutine used before describing a method of determining the SEL signal will be described. Subroutine 1 (sub
1) is a subroutine for selecting the output of the same image data for all pixels from js to je for i. Next, a subroutine 2 (sub2) is a subroutine for alternately selecting outputs from two image data from js to je for i. In particular, the subroutine 2 outputs the SEL signal 1 at j if it is an odd address, and outputs 0 if it is an even address. That is, the data of the image A is output to the odd addresses and the data of the image B is output to the even addresses as the composite image data. Finally, in subroutine 3 (sub3), the data of the image B is output as odd-numbered addresses and the data of image A is output as even-numbered addresses as composite image data in j, contrary to subroutine 2. FIGS. 7 to 9 show flowcharts of the above three subroutines.

Finally, the main routine for determining the SEL signal is as shown in the flowchart of FIG.

First, the number of rows n of i of the divided part when the overlapping part is divided as shown in FIG. 6 is obtained.

SE for the non-overlapping part (i <is) of the image A in FIG.
Assuming that the L signal is 1, the selector 14 outputs only the data of the image A.

When i becomes is, output of the overlapping portion is started. First
Next, the output is determined for the portion of FIG. 4A (is ≦ i <is + n). In this case, both data of the image A and the image B are alternately output to the i-th row by the subroutine 2, and only the data of the image A is output to the i + 1-th row by the subroutine 1. That is, (i, j), (i + 1, j), (i, j + 1), (i + 1, j + 1)
The four pixels have a configuration as shown in FIG. 4 (b).

Second, the output is determined for the portion (is + n ≦ i <is + 2n) in FIG. 6B. Here, the proportions of the image data of the images A and B are equal. Therefore, the checkerboard pattern based on the image data of the image A and the image B is converted into the subroutine 2 and the subroutine 3
Can be realized alternately. That is, the fourth
FIG. 13C can be realized.

Third, the output is determined for the part (is + 2n ≦ i ≦ ie) in FIG. 6C. Here, image A and image B of the portion of FIG.
Of the image data is reversed. Therefore, i
Only the data of the image B is output to the row by the subroutine 1, and the image A and the image B are output by the subroutine 2 to the (i + 1) th row.
4 (d) by alternately outputting the two data
To achieve. i becomes ie, and the ie line is SE by the same method.
When the L signal is determined and the output is completed for (ie, je), the output determination of the image data of the overlapping portion is ended.

Finally, the selector 14 outputs only the data of the image B from the selector 14 with the SEL signal set to 0 for the non-overlapping portion (ie <i) of the image B in FIG.

As described above, by variably controlling the output ratio of the output data of both images according to the position in the overlapping portion, an image without a sense of discomfort at the joint can be obtained. In particular, by making the output ratio of the image closer to the position in the overlapping portion larger than the output ratio of the image farther away, an image with less discomfort can be obtained.

In the above embodiment, the number of matrixes constituting the group was set to four, and three-stage grading was performed. However, if the number of matrixes is increased, smoother multi-stage grading can be obtained. If the width of the overlapping portion as shown in FIG. 1C is increased, it is possible to perform fade-out or fade-in in a wide image area. In addition, the same thing can be realized not only by dithering but also by another method as long as one group can be constituted by a plurality of output units.

Further, the present invention can be applied not only to the recording method but also to a display such as a display.

Also, since the output of the subroutine 3 of the controller 15 in the embodiment is a negation of the output of the subroutine 2, it is of course possible to configure using this.

[Effects of the Invention] As described above, according to the present invention, a composite image is formed at a boundary between a first image composed of a plurality of dots and a second image different from the first image. An image synthesizing method, comprising: a synthesizing region for synthesizing the first image and the second image; and a specifying separating step of separating the synthesizing region into a plurality of rectangular regions parallel to a boundary. The number of dots of the first image and the number of dots of the second image in a predetermined number of dots, which are processing blocks when performing the synthesis processing of the image and the second image, In the first direction from the image to the second image, the dot number of the second image is sequentially changed for each of the rectangular regions so as to increase the ratio of the number of dots. Is the first in the vertical second direction
And the dots forming the first image and the dots forming the second image in order to output a composite image in accordance with the control. And selectively outputting the number of dots of the first image and the number of dots of the second image in the processing block as the first image in the synthesis area. From the second image to the second image in the first direction so as to increase the ratio of the number of dots in the second image in order to increase the ratio of the number of dots in the second image. realizable.

Further, since the control is performed so that the dots of the first image and the dots of the second image are mixed and arranged in the second direction perpendicular to the first direction, the first or the second configuration is used in the configuration where the mixed arrangement is not performed. Although the dots of the second image are generated as an array of linear dots, they have an adverse effect visually,
A good composite image can be formed without such a phenomenon.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a joint portion of an image, FIG. 2 is an explanatory diagram of a matrix group, FIG. 3 is an explanatory diagram of an overlapping portion of an image, FIG. 4 is an explanatory diagram of a distribution of image data of the matrix,
FIG. 5 is a block diagram of the embodiment, FIG. 6 is a diagram showing pixel coordinates of an overlapped portion of an image, and FIGS. 7 to 10 are control flowcharts of a controller in the embodiment. In the figure, 1c is an overlapping portion of an image, 3 is a dither matrix group, 4a to 4c are divided areas in the overlapping portion, and 10,1
1 is an address counter, 14 is a selector, 15 is a controller, and 17 is a printer.

Claims (1)

(57) [Claims] 1. A first device comprising a plurality of dots.
An image combining method for forming a combined image at a boundary between the two images based on the image and the second image different from the first image, wherein the combining is performed when the first image and the second image are combined. A designation separation step of designating an area and separating the synthesis area into a plurality of rectangular areas parallel to the boundary; a predetermined number of dots which are processing blocks when the synthesis processing of the first image and the second image is performed. The first in
The number of dots of the image and the number of dots of the second image are set to be equal to the first number of the images in the combination area from the first image to the second image.
While the dot number of the second image is sequentially changed for each of the rectangular areas along the direction of the second image in the second direction perpendicular to the first direction in the rectangular area. The dots of the first image and the dots of the second image are controlled to be arranged in a mixed manner, and the dots forming the first image and the second image are formed to output a composite image according to the control. An output step of selectively outputting dots.