JPS6225568A - Picture data writing method - Google Patents

Abstract

PURPOSE:To prevent the first picture from being broken by the writing of the second picture by writing the second picture in every (n-1)th address on top of the first picture that is written with standard number of picture elements. CONSTITUTION:In case of inputting the second picture at the time when the inputting of the first picture like (a) in the figure in standard resolution mode is ended, the second picture is inputted on top of the first picture in every other line of the same picture page of the picture memory where the first picture is recorded. Consequently, the first and the second pictures are inputted and stored in the picture memory alternatingly by one line. Figures (c) and (d) are the reproduction picture of the first and the second pictures respectively extracted from the picture memory in whose same one page are the first and the second pictures written as shown in a figure (b). The display pictures are drawn rough in the figure because the addresses are jumping, however, in real practice, the tinned lines are interpolated and then displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image data writing method for an image input device that inputs a plurality of images into an image memory.

In conventional technology image input devices, there is a standard resolution mode (a mode in which an image is input into an image memory in horizontal X pixels and vertical y pixels) and a low resolution mode (for example, in the case of half the number of pixels, a horizontal It is assumed that there are two image input functions: F!B pixel and vertical (y/2) pixel input mode). In this case, when the low resolution mode is used, it is possible to input two times as many images on two screens using the image memory for one screen in the standard resolution mode. Conventionally, when images θ for two sides of FIGS. 2(a) and (b) are input to the image memory using such a low resolution mode, the images shown in FIG. 2(C) are input to the image memory.
The image data for one screen was input into a continuous area of the image memory. In other words, in FIG. 2(C), the upper half is the first image, the lower half is the second image, and FIG.
d) (e) are respectively 1st. A reproduction display screen of the second image is shown.

Problems to be Solved by the Invention Consider a case where two images are input using such a conventional image input device when the image memory is only for one screen in standard resolution mode. If you know in advance that you will input two images, set the low resolution mode when inputting the first image and input the two images to the image memory as shown in Figure 2. be able to. However, when inputting the first image, I intended to input only one image in standard resolution mode, but the image shown in Figure 3(a)
If you suddenly want to input the second image after inputting the first image into the image memory as in the example above, and you switch to low resolution mode and input the second image, 3
As shown in Figure (b), part of the first image is completely destroyed, and there is a problem in that it cannot be interpolated and displayed.

The present invention can be used even in cases where the first image is input in standard resolution mode without being set to low resolution mode in advance, and when the second and subsequent images are input, the input is switched to low resolution mode. To provide an image storage system capable of protecting the first image from destruction.

Means for Solving the Problems The image data incorporation method of the present invention is based on the standard number of pixels.
Write the image to the image memory and then write the image to the first image memory.
When writing a second image at a low resolution of 1/n of the standard number of pixels on the same screen page on which images have been accumulated, the second image is written on the first image written at the standard number of pixels (n- 1
) It is characterized by writing to discrete addresses of every pixel.

Effect: According to this configuration, when manually performing 1y in low resolution mode (
n-1) Since images are input at intervals for every pixel, even if the first image is input in standard resolution mode without setting to low resolution mode in advance, there is a time when the second and subsequent images are manually input. If you switch to low resolution mode, you can input multiple images without destroying the first image.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In this example, 1. in FIG. 2 (aHb). An example will be described in which the number of pixels in the vertical direction of the second image is halved and the second image is inserted into a screen page in which the first image is included.

If you are planning on inputting two images in advance, you can set the low resolution mode when inputting the first image and input the two images as shown in Figure 2 (C). However, as in the example above, if you want to input another image after inputting the first image in standard resolution mode, conventionally, as shown in Figure 3(b), Although the lower half of one image is completely destroyed, the image data embedding method of the present invention can solve this problem as follows.

In the present invention, when inputting another second image after inputting the first image as shown in FIG. 1(a) in standard resolution mode, the first image in the image memory is stored. The second image was input every other line from the top of the first image onto the same screen page, and as a result, the first image and second image were input alternately every line on the image memory. Memorized in form. FIGS. 1(c) and 1(d) each display the first page on the same screen page as shown in FIG. 1(b). The second screen is a display screen that is reproduced by extracting the first and second screens from the built-in image memory.In the diagram, the display image is drawn roughly because the addresses are discontinuous, but the actual display image is In this case, the lines thinned out by t are interpolated and displayed. Therefore, the conventional situation where a portion of the first image is completely destroyed does not occur.

Furthermore, when inputting multiple images, it is possible to completely destroy the images by inputting them every few lines starting from the top of the previously inputted image, and inputting the multiple images so that they are lined up alternately. You can input without any need.

In the above embodiment, the case where the vertical resolution is reduced to 1/n has been described as an example, but this also applies to the case where the number of horizontal pixels is reduced to 1/n.

As described in the detailed description of the invention, the image data writing method of the present invention writes a first image in the image memory with a standard number of pixels, and then writes a second image on the same screen page in the image memory where the first image was written. When writing with a low resolution of 1/n of the standard number of pixels, the second image is written on the first image written with the standard number of pixels.
Since both items are written to discrete addresses every (n-i) pixels, the first image will not be destroyed by writing the second image, and it is necessary to switch to standard resolution mode before inputting the image. , there is no need to select low-resolution mode or low-resolution mode, and you can either obtain a single high-resolution image when inputting the first image, or input multiple images at a lower resolution. Since the image can be selected at any time, images can always be input at the maximum resolution, which is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a specific example of the image data input method of the present invention, and FIGS. 2 and 3 are explanatory diagrams of input methods to an image memory of a conventional image input device, respectively.

Claims (1)

[Claims] 1. When writing a first image in the image memory with a standard number of pixels, and then writing a second image in the same screen page in the image memory on which the first image was written, with a low resolution of 1/n of the standard number of pixels, An image data writing method in which a second image is written at discrete addresses every (n-1) pixels on a first image written with a standard number of pixels.