JPH0142423B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an image data processing method, and particularly relates to an image data processing method, in which a plurality of screen regions to be created are distributed discretely within a large screen space. The present invention relates to a method for creating an efficient processing space by removing unnecessary redundant areas from the space and performing simultaneous creation processing for a plurality of images at the same time.

[Technology background]

In image data processing such as remote sensing images, for example, when creating an image based on image data, the amount of information in the original image is enormous, so creating the entire screen requires a large data processing area. , long processing times and complex processing methods are required. On the other hand, when using such image information, it is rare that a full-screen image is required at the same time; for example, from image data from the Far East region to multiple localized regions such as the Kanto region of Japan, Saitama, and Chiba, etc. Many processes are performed to create images.

FIG. 1 shows an example of image data processing, where 1 is an original screen space consisting of all input image data;
2 (2-1, 2-2, . . . , 2-n) indicates a plurality of image creation areas that actually require output. When performing image creation processing based on input image data for such a plurality of image creation areas 2, only data corresponding to the required image creation area 2 is extracted from the input image data, and images are created individually. There is a method in which an image is uniformly created for the original screen space of the image data, including unnecessary areas, and then only the image of the necessary area 2 is cut out from the image of the created original screen space size. .

The former method has the advantage of shortening the processing time, and the latter method has the advantage of simplifying the processing method.

However, when extracting multiple scattered areas from a huge amount of image data and creating multiple images, the method of extracting and processing only the required area handles each area with a relative address. Addressing or sampling of image data becomes complicated, and a method that processes all image data uniformly requires a large memory area, wastes a lot of processing data, and increases processing time. It was hot.

[Object and structure of the invention]

An object of the present invention is to provide an efficient processing means that does not require complicated addressing or a large memory area, in order to simultaneously create images of multiple areas distributed within image data of a large original screen space. In particular, as a configuration for this purpose, in a system that creates images of a plurality of regions distributed within a large screen space, the system includes one of the image creation regions in each of the x direction and the y direction of the screen space. and a means for identifying a blank section that does not include any image creation area, and a means for creating a new image processing space by connecting only the intervals that include the image creation area, excluding the blank area, The present invention is characterized in that image data in the screen space is sampled based on the image processing space and image creation processing is performed.

[Embodiments of the invention]

The present invention will be explained below using examples. General image data is, for example, meteorological satellite image data that observes the earth two-dimensionally.
It consists of two-dimensional data in the x and y directions. Therefore, two-dimensional addressing and sampling of image data is required to create a screen.

Therefore, a sampling table is provided along the x-axis and y-axis of the original screen space of the input image data,
Specify the respective coordinate intervals on the x-axis and y-axis that include the area that requires image creation.

FIG. 2 shows sampling tables 3 and 4 for the x-axis and y-axis, respectively, provided in the original screen space 1 of input image data.

Normally, the image creation regions 2-1, 2-2, ..., 2-n to be processed in the original screen space 1 are widely scattered in the space as shown in the figure, and in some cases, partially overlap. Therefore, the distribution range on the x-axis and y-axis is calculated for each image creation area, and the image creation on the x-axis and y-axis occupied by one of the image creation areas is added to sampling tables 3 and 4, respectively. Area sections 3a, 4
Set a. As a result, unnecessary blank sections 3b and 4b are provided on the sampling tables 3 and 4. The shaded area in the screen space 1 represents a blank area that does not include such an image creation area.

Next, as shown in FIG. 3, all blank sections 3b and 4b are removed from the sampling tables 3 and 4, and each image creation area section 3a and 4a is shifted to create a compact processing table 5 and 6. , an image processing space 7 are created. In the image processing space 7, each image creation area can be processed with a common relative address.

In this way, all the necessary screen creation areas within the original screen space can be created by simple address conversion.
By moving to the image processing space 7 with a high effective area ratio, efficient image creation processing can be performed on the entire image data within this space. From the images corresponding to the image processing space created in this manner, images of each required area may be extracted and output.

FIG. 4 is a configuration diagram of a system according to an embodiment of the present invention. In the figure, 8 is the original image data file;
9 are image creation parameters, 10-1, 10-2,
..., 10-n is image creation area data, 11 is an image creation area determination unit, 12 is an original image-created image data address correspondence determination unit, 13 is an original image processing area determination unit, 14 is an original image data sampling unit, 15 denotes an image creation unit, and 16-1, 16-2, and 16-n represent created image data files.

Image creation parameters 9 are 10-1, 10-
The image creation area 2,..., 10-n includes the size and center position data, the number of images, etc. For example, the image creation area 2-n has the center position (x _o , _yo ), the vertical and horizontal size ln, Represented by kn.

The image creation area determination unit 11 determines each image creation area 2-2 based on the given image creation parameters.
An address in the original screen space coordinates representing the range 1, 2-2, . . . , 2-n is calculated.

Original image-created image data address correspondence determining unit 1
2 is an image creation area 2-1, 2-2,..., 2-n
x-axis and y-axis sampling tables 3 and 4 are created from the address range related to. As a result, blank sections △x ₁ , △x ₂ , △x ₃ , △y ₁ , etc. are obtained.

The original image processing area determining unit 13 determines blank sections △x ₁ , △x ₂ , △x ₃ , △ from the sampling tables 3 and 4.
Create processing tables 5 and 6 by removing y _1, etc.
The image processing space 7 defined by the new processing tables 5 and 6 is represented by coordinates x' and y'. For example, the center address (x ₁ , y ₁ ) of the image creation area 2-1 in the original screen space 1 is represented by the address (x ₁ ', y ₁ ') in the image processing space 7, and x' _{1 , y 1 1} ′ is given by x ₁ ′=x ₁ −△x, y ₁ ′=y ₁ −△x ₁ . Similarly, the addresses of the image creation area 2-2 are correlated by address conversion of x ₂ ′=x ₂ −(Δx ₁ +Δx ₂ ) and y′ ₂ =y ₂ −Δy ₁ . The processing tables 5 and 6 are tables that associate all (x', y') addresses in the image processing space 7 with addresses in the original screen space.

The original image data sampling unit 14 samples all the original image data corresponding to the image processing space 7 defined by the processing tables 5 and 6 from the original image data file 8.

The image creation unit 15 performs image creation processing based on the sampled original image data using processing tables 5 and 6, and further performs image creation processing on the individual regions 2-1 and 2-1.
Image data files 16-1, 16-2,..., 16- are created by cutting out images 2-2,...,2-n.
Store in n.

〔Effect of the invention〕

As described above, according to the present invention, multiple image creation areas distributed over a large screen space can be
By gathering images densely in a small space, images can be efficiently created and processed all at once, requiring only a small memory area, and processing time can be significantly shortened without complicating the processing method. can.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of image creation areas distributed within a large screen space, FIGS. 2 and 3 are explanatory diagrams of the principle of the present invention, and FIG. 4 is a configuration diagram of a system according to an embodiment of the present invention. In the figure, 1 is the screen space of the original image data, 2-1,
2-2,..., 2-n are image creation areas, 3 and 4 are sampling tables, 5 and 6 are processing tables, and 7
represents the image processing space.

Claims (1)

[Claims] 1. In a system that creates images of multiple regions distributed within a large screen space, in each of the x and y directions of the screen space,
A means for identifying a section including any image creation area and a blank section not including any image creation area, and a new screen processing space by connecting only the sections including the image creation area excluding the blank area. 1. A method for simultaneously creating a plurality of images, comprising: means for creating a plurality of images, and performing image creation processing by sampling image data in the screen space based on the image processing space.