JP3437456B2 - Image information transmitting device, image information receiving device, image information transmitting / receiving system, image information transmitting method, and recording medium recording program - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device, a reception device, a transmission / reception system, a transmission method for image information, and a recording medium recording a program for extracting or displaying image information.

[0002]

2. Description of the Related Art By improving the processing speed of a computer, it is possible to display digital still images and moving images with high precision. When transmitting image data, the amount of data is enormous, but the communication capacity of the communication path is limited. Therefore, in order to transmit a large amount of images, the images are compressed and transmitted. .

Image compression methods include lossless coding that can completely restore data and lossy coding that does not completely restore data.

[0004]

However, the reduction rate of the data amount is limited in the normal data compression method. Further, there is known a method of reducing the data amount by cutting out a necessary partial area from one image data, but this method cannot be applied when the partial areas are scattered in the entire image. There is also a method of reducing the amount of data by sampling, but there is a problem that the original resolution is lost.

An object of the present invention is to reduce the amount of transferred image data.

[0006]

According to a first aspect of the present invention, there is provided an image information transmitting apparatus, wherein an extracting means for extracting pixel data of one or a plurality of designated levels from a plurality of pixel data, and the extracting means. Position data acquiring means for acquiring position data of the pixel data of the specified level among the time-varying pixel data when the level of the pixel data extracted by And transmitting means for adding the time information of the pixel data to the position data acquired by the acquisition means and transmitting the time data.

According to the present invention, when transmitting pixel data, it is not necessary to transmit one entire image, and only position data of pixel data of a designated level needs to be transmitted. The amount can be reduced and the transmission time can be shortened.

According to a seventh aspect of the present invention, there is provided an image information receiving device for receiving position data of pixel data of one or a plurality of designated levels and displaying an image, and receiving means for receiving the position data of the designated level. And display means for displaying the temporal change of the position of the pixel data of the designated level based on the temporal change of the position data received by the receiving means.

According to the present invention, it is possible to receive the position data of the pixel data of the designated level and display the pixel data based on the position data without having to receive the entire image data. It is possible to reduce the amount of image data and the data transfer time.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of an image information transmitting / receiving system according to an embodiment of the present invention. This image information transmission / reception system is a weather information transmission / reception system that receives meteorological data transmitted from a meteorological satellite, obtains areas of a predetermined amount of precipitation from the received meteorological data, and displays or prints those areas.

The antenna 11 receives the meteorological data transmitted from the meteorological satellite, and the host computer 1 on the transmitting side receives the meteorological data.
In step 2, the meteorological data is analyzed and, for example, a precipitation distribution image image is created. Then, the host computer 12
The data including the position data of the pixels of the designated level in the precipitation distribution image is transmitted to the receiving side via the network 13. The receiving computer 14 prints a precipitation distribution image of a specified level on the printer 15 based on the received data.
To output from.

2 and 3 are flowcharts of the processes executed by the host computer 12 on the transmitting side and the computer 14 on the receiving side when the meteorological satellite image data is received from the meteorological satellite.

Image data detected by a visible sensor and an infrared sensor sent from a meteorological satellite is received every hour (FIG. 2, S1). A precipitation distribution image is created based on the image data, and the precipitation distribution image is stored in the memory (S2).

When a specific precipitation amount or a range of precipitation amount is designated by the receiving side, the pixel of the designated precipitation amount is extracted from the precipitation amount distribution image, and the coordinate data of the extracted pixel is obtained to obtain the precipitation amount. Correspondingly, one or a plurality of coordinate data are stored in the memory as precipitation area extraction data (S3). Further, the precipitation area extraction data is delivered to the receiving side (S
4).

As a result, when a specific precipitation amount (level) is specified, only the coordinate data of the specified precipitation amount point need be transmitted without sending the entire image data. And the data transmission time can be shortened.

FIG. 4 shows a correspondence table between the visible image level and the infrared image level and the precipitation level. The part surrounded by a solid line in the figure shows an area where the precipitation level is “45” or more. Precipitation levels are high in areas with high visible image levels and low infrared image levels.

Next, FIG. 5 is a diagram showing a region of interest of a 1000 × 1000 pixel precipitation distribution image, and FIG.
It is a figure which shows the structure of the position coordinate data set which matched the extraction level of the pixel data of the attention area shown in FIG. 5, and the position data of the pixel data of the same extraction level.

Now, assuming that the maximum value of the extraction level of the precipitation distribution image is "255", the X and Y coordinates of the pixel of the extraction level "255" of the attention area of FIG. 5 are (401, 601),
The X and Y coordinates of the pixel at the extraction level “254” are (401,
602) and (402, 601), the extraction level “25
It is assumed that the X and Y coordinates of the "3" pixel are (402, 602). In this case, as shown in FIG. 6, as the position coordinate data set, as the position information of the image size “1000, 1000” and the extraction level “255” (401, 601).
(Decimal number), (401, 602) and (402, 601) as position information of extraction level “254”, and (402, 602) as position information of extraction level “253” are created, and the host computer 12 on the transmission side Stored in memory.

If the image size is predetermined on the transmitting side and the receiving side, the data indicating the image size may not be transmitted. In addition, for example, when requesting the transmission of data by designating the pixel extraction level from the receiving side, the data indicating the extraction level may be omitted and only the position information may be transmitted.

The pixel level of the precipitation distribution image and the precipitation level have a proportional relationship as shown in FIG. 7, and the higher the precipitation distribution image level, the higher the precipitation amount. Next, the processing content on the receiving side when the precipitation area extraction data is distributed from the transmitting side will be described with reference to the flowchart of FIG.

When the precipitation area extraction data is received (see FIG. 3,
S5), the precipitation area extraction data is stored in the memory of the receiving computer 14 (S6). Then, based on the precipitation area extraction data, the precipitation distribution image of the specified precipitation is restored and stored in the memory (S7). In particular,
A table having the image size of the position coordinate data set of FIG. 6 is created in the memory, the position information of the position coordinate data set is made to correspond to the X and Y coordinates of the table, and the extraction level is set to the coordinates determined by the position information. Write the indicated data. Thereby, the distribution image of the designated precipitation amount can be restored. Then, the restored precipitation amount distribution image is output to the display or the printer 15 for display or printing (S8).

FIG. 8 is a time chart showing the processing sequence on the transmitting side and the receiving side described above. It is assumed that reception of the meteorological satellite image data is started, for example, at 0:30 and is completed at 1:00 (Fig. 8, 1).

Next, a precipitation distribution image is created from the received meteorological satellite image data (FIG. 2, 2). From the precipitation distribution image, the area with the specified precipitation is extracted (Fig.
3), the precipitation area extraction data including the image size, the precipitation amount, and the position information of the area of the designated precipitation amount is transmitted (FIG. 4, 4).

On the receiving side, the transmitted precipitation area extraction data is received (FIG. 5, 5), and based on the precipitation area extraction data, the precipitation distribution image of the area of the designated precipitation amount is restored ( 6). Then, the precipitation distribution image is displayed / printed (FIG. 7, 7). Finally, the received precipitation area extraction data is saved as a position coordinate data set of the area of the designated precipitation amount (FIG. 8).

FIG. 9 is a diagram showing an example of a precipitation area extraction data storage file name created on the receiving side at this time. In the present embodiment, the name of the weather satellite that received the data, the year of reception, the month, the day, the time, and the extraction level are defined as the file name.

As described above, since the receiving side only needs to save the location information of the area of the required precipitation in the file, the amount of data to be saved can be greatly reduced.
Now, as the extraction level, "255", "254", "25"
A method of reconstructing and displaying a precipitation amount distribution image from three types of precipitation area extraction data when three levels of "3" are designated will be described with reference to FIG.

From the position information of the pixels of the extraction level "255", the position information of the pixels of the extraction level "254", and the position information of the pixels of the extraction level "253", the precipitation amounts corresponding to those extraction levels are calculated. Since the position of the image of the area can be specified, the area of the three types of precipitation can be determined by displaying the precipitation distribution image of the areas of the specified three types of precipitation based on the position information. It can be combined and displayed.

In this embodiment, since the position information of the pixels of the designated level is transmitted as the position coordinate data set, the positions of the pixels of a plurality of levels on the image can be specified from the position information. It is possible to combine and display / print pixels of a plurality of levels. Further, in this case, since it is not necessary to transmit the entire precipitation amount distribution image, it is possible to reduce both the amount of data to be transmitted and the transmission time.

Further, in the present embodiment, since the positional information of the area of the designated precipitation amount is sent, for example, in which direction the area of the specific precipitation amount moves from the temporal change of the positional information. I can know

FIG. 11 is a diagram showing a temporal change of the precipitation amount distribution image of FIG. From the position information of the area of the designated precipitation amount obtained from the precipitation distribution image at time Time = 1 and the position information of the region of the specified precipitation amount obtained from the precipitation amount distribution image at time Time = 2, The difference is calculated and the movement vector is calculated. The movement vector is obtained by calculating the center (center of gravity) of the distribution of areas with the same precipitation and from the change in the coordinates of the center of gravity. It is also possible to know from the number of pieces of position information of the same precipitation amount in the position coordinate data set whether the area of a specific precipitation amount is widening or narrowing.

As a result, it is possible to obtain a movement vector indicating the speed and direction of movement of a specific precipitation area, so that it is possible to grasp the temporal change of the specific precipitation area and to use the movement vector to predict the future. The position can also be predicted.

FIG. 12 is a diagram showing a precipitation amount distribution image created from meteorological satellite image data received from a meteorological satellite. In the figure, the darker the area, the greater the amount of precipitation. The precipitation distribution image is printed and output by the printer 15 on the receiving side.

Next, FIG. 13 is a time chart when the extraction, transfer, and restoration of pixels of a designated level are performed in parallel. The host computer 12 on the transmitting side first extracts the precipitation area of the designated precipitation amount at the timing shown in (1) of FIG. Then, the precipitation area of the next precipitation amount is extracted at the timing shown in FIG. 2B, and the precipitation area extraction data already extracted at the timing (1 ′) is transferred to the receiving side in parallel. Then, the next precipitation area is extracted at the next timing shown in FIG. 3C, and the precipitation area extraction data extracted at the immediately preceding timing (2) is transferred at the same timing (2 ′). At the same timing (1 ″) as the transfer of this data, the computer 14 on the receiving side receives the precipitation area extraction data (the precipitation extracted at the timing of (1) and the precipitation transferred at the timing of (1 ′)) extracted first. The precipitation distribution image is restored based on the area extraction data).

Next, the sending host computer 12
Transfers the precipitation area extraction data extracted at the timing (2) in FIG. 13 at the timing (3 ′). At the same timing as this transfer, the receiving computer 14
The precipitation amount distribution image is restored from the second extracted precipitation area extraction data (FIG. 13, (2 ″)). Furthermore, at the next timing (3 ″), from the third extracted precipitation area extraction data. Restore the precipitation distribution image.

As described above, the process of extracting the region of the designated precipitation amount on the transmitting side, the process of transferring the positional information of the extracted region, and the process of restoring the precipitation amount distribution image on the receiving side are performed in parallel. By doing so, the data processing time can be shortened.

Next, FIG. 14 is a diagram showing the priorities of data distribution when the priorities of processing are determined for a plurality of designated levels. According to the priority of data transmission requested by the receiving side, the level of precipitation distribution image "25
The priority of "5" is set to "1", the priority of "254" is set to "2", and the priority of "253" is set to "3". Then, in the process of generating the extraction data of the specified level from the precipitation distribution image, the data of the higher priority level is preferentially extracted, the position information of the pixel of that level is obtained, and the level value and the position information are acquired. A position coordinate data set consisting of and is generated.

In this way, the priority of the data required on the receiving side is determined, and the position coordinate data set is generated on the transmitting side in order from the data of the higher priority level. Can be sent in order.

Next, the case where the temporal change of the amount of solar radiation is extracted from the position coordinate data set will be described. Figure 15
[Fig. 4] is a diagram showing changes in the amount of solar radiation when the amount of solar radiation in a certain area is measured hourly. In the figure, the X and Y coordinates of the position where the level of the solar radiation amount for the first hour (Time = 1) is "255" are (2, 3) and the solar radiation level is "25".
The X and Y coordinates of the position "4" are (1,2).

The X and Y coordinates at the position where the solar radiation level is "255" between the second hour (Time = 2) are (3, 3),
(1, 2), and there is no coordinate of the solar radiation level “254”.

The X and Y coordinates of the position of the solar radiation level "255" at the third hour (Time = 3) are (4, 4),
The X and Y coordinates of the position where the solar radiation level is "254" are (2,
1).

FIG. 16 shows an example of the position coordinate data set when the amount of solar radiation changes with time as described above. As described above, the coordinates of the solar radiation level “255” are
(2,3) → (3,4), (1,2) over time
→ Changes to (4,4). If this is expressed by coordinates including the time axis, (2,3,1) → (3,4,2), (1,2,2)
→ becomes (4, 4, 3).

Therefore, the image size of the position coordinate data set in this case is 4 × 4 × pixels in the solar radiation image and the length of the time axis is “3”.
3 = 48. Then, the position information including the time information of the extraction level “255” is (2, 3, 1), (3, 4,
2), (1,2,2), and (4,4,3).

By thus adding the time information to the position coordinate data set and transmitting it, the receiving side can recognize the temporal change of the position of the designated solar radiation level from the position coordinate data set including the time information. Can be displayed.

Further, the program data according to the present invention is recorded on a recording medium 1701 such as a floppy disk or a CDROM shown in FIG.
01 is an information processing device (personal computer or the like) 17
02 medium drive (floppy disk driver,
CDROM driver or the like), and the read program data is stored in a storage device 170 such as a hard disk.
3, and the program may be executed. Alternatively, the program data is stored in a storage device 1704 such as a hard disk of a computer of an information provider, and the program data is transferred to the information processing device 1702 of the user by communication, and the storage device 1703 of the user side.
The program may be stored in the memory and executed. Further, the program recorded in the recording medium 1701 may have only some functions of the flowcharts described in the embodiments. For example, data may be transmitted or received by another communication program without having a transmission function and a reception function.

In the above-described embodiment, the case of displaying the area of the designated precipitation amount level or the temporal change of the solar radiation amount is described. However, the present invention is not limited to this, and other meteorological data other than the precipitation amount and the solar radiation amount is also displayed. However, the present invention can be applied to image data other than weather data.

[0046]

According to the present invention, the position information of one or more designated levels in image data is obtained, the position information is transmitted, and the image of the designated level is received by the receiving side. By restoring the data, the amount of data to be transmitted can be reduced and the data transfer time can be shortened. Further, the movement vector of the pixel of the same level can be easily obtained from the change in the position information of the pixel of the designated level.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an image information transmitting / receiving system according to an embodiment of the present invention.

FIG. 2 is a flowchart on the transmitting side.

FIG. 3 is a flowchart on the receiving side.

FIG. 4 is a diagram showing a correspondence table of visible / infrared image levels and precipitation levels.

FIG. 5 is a diagram showing a region of interest in image data of 1000 × 1000 pixels.

FIG. 6 shows a structure of a position coordinate data set.

FIG. 7 is a diagram showing a relationship between a precipitation level and a precipitation distribution image level.

FIG. 8 is a time chart showing the processing sequence on the transmission side and the reception side.

FIG. 9 is a diagram showing an example of a precipitation area extraction data storage file name.

FIG. 10 is an explanatory diagram of a method of restoring a precipitation amount distribution image.

FIG. 11 is a diagram showing a temporal change of a rainfall distribution image.

FIG. 12 is a diagram showing a precipitation distribution image.

FIG. 13 is a time chart when performing extraction, transfer, and restoration of data of a designated level in parallel.

FIG. 14 is a diagram showing level distribution priorities.

FIG. 15 is a diagram showing a solar radiation amount temporal change image.

FIG. 16 is a diagram showing an example of a position coordinate data set including time.

FIG. 17 is a diagram showing a recording medium.

[Explanation of symbols]

11 antenna 12 Sending host computer 13 network 14 Receiving computer 15 Printer

Claims (16)

(57) [Claims] 1. An extracting means for extracting pixel data of one or a plurality of designated levels from a plurality of pixel data, and a level of the pixel data extracted by the extracting means is time.
Of the pixel data that changes with time
The position data of the pixel data of the specified level in
A position data obtaining means for obtaining a position data acquired by the position data acquiring means
An image information transmitting apparatus, comprising: a transmitting unit that adds and transmits time information of the pixel data . 2. The transmission means transmits data composed of data indicating the designated one or more levels and position data of pixel data of the designated level. Image information transmission device. 3. The image information transmitting apparatus according to claim 2, wherein the transmitting unit adds the image size of the pixel data to the position data and transmits the position data. 4. The position data acquisition means is the designated
The pixel data of the highest priority level among the
The image information transmitting apparatus according to claim 1, wherein the image information transmitting apparatus sequentially acquires the position data of the image data. 5. The pixel data is at least precipitation data.
The weather data consists of
Transmitting location data of the point of precipitation data
The image information transmitting apparatus according to claim 1, 2, or 3. 6. A plurality of at least precipitation data
One or more specified levels from the weather pixel data
Means for extracting meteorological pixel data of the image data and the position data of the meteorological pixel data extracted by the extracting means.
Data for obtaining position data, and precipitation data obtained by the position data obtaining device
And transmission means for transmitting position data of the point
An image information transmission device characterized by: 7. An image information receiving apparatus for receiving position data of pixel data of one or more designated levels and displaying an image, comprising: receiving means for receiving the positional data of the designated level; and the receiving means. Temporal of said position data received
When the position of the pixel data of the specified level based on the change
An image information receiving apparatus, comprising: a display unit that displays a temporal change . 8. The display device according to claim 7, wherein the display means superimposes and displays images of respective designated levels based on position data of a plurality of designated level pixel data received by the receiving means. Image information receiving device. 9. The position data of the pixel data of one or a plurality of levels specified by the specifying means is provided with a specifying means for specifying one or a plurality of levels of pixel data to be displayed to a transmitting side. 8. The image information receiving apparatus according to claim 7, wherein the display means restores and displays the pixel data of the designated level based on the position data received by the receiving means. 10. The receiving means receives the position data of a plurality of designated levels of pixel data, and stores the position data for each designated level.
The image information receiving device described. 11. A method specified from a plurality of pixel data
Extraction means for extracting pixel data of one or more levels
And position data of the pixel data extracted by the extraction means
And the position data acquired by the position data acquisition unit.
An image information transmitting apparatus having transmitting means for transmitting, and receiving means for receiving the position data of the designated level.
And the time of the position data received by the receiving means.
When the position of the pixel data of the specified level based on the change
Image information receiving device having display means for displaying temporal change
Image information transmitting and receiving system, wherein the location, in that it consists of. 12. The transmitting means of the image information transmitting device
Is the data indicating the level specified in the position data.
The image information transmission / reception system according to claim 11 , wherein the image information transmission / reception system is additionally provided. 13. An image information transmitting device having a communication function.
Of one or more specified records from a plurality of pixel data.
The step of extracting bell pixel data, and the level of the pixel data extracted by the extracting step
Changes with time, the pixel data
Position data of the pixel data of the specified level in the data
Position data acquisition step of acquiring the position data and the position data acquired in the position data acquisition step.
Transmission with the time information of the pixel data added to the data
Image information transmission method characterized by executing steps and
Law. 14. The image information transmitting device specifies the position data in the transmitting step.
Characterized by adding data indicating the specified level and transmitting
The image information transmitting method according to claim 13 . 15. A computer is provided with one or more designated registers among a plurality of pixel data.
The extraction means for extracting the bell pixel data and the level of the pixel data extracted by the extraction means are
Of the pixel data that changes with time
The position data of the pixel data of the specified level in
The position data acquisition means to acquire and the position data acquired by the position data acquisition means
Transmitting means for adding and transmitting time information of the pixel data
Computer that records a program to function as
A data-readable recording medium. 16. A meteorological image data comprising a plurality of at least precipitation data for a computer.
One or more of the specified level
Extracting means for extracting the data and the position data of the meteorological pixel data extracted by the extracting means.
Data for obtaining position data, and precipitation data obtained by the position data obtaining device
Function as a transmission means for transmitting position data of
Computer readable recording program for
Recording medium.