KR20090054529A - Satelite image providing method and system - Google Patents

Abstract

A method for offering a satellite image and a system thereof are provided to designate the region which a user takes an interest in from a quick-look image, easily. Raw data is generated from satellite image data(S210). Image line index data, including image line block data and storage location information of the data, is generated(S220,S230). The image line block data is transmitted to a user terminal. Information about the region of interest(ROI), which is established on a quick-look image generated by using the image line block data, is received from the user terminal. The image line data corresponding to the region of interest is extracted from the image line block data(S240).

Description

Satellite image providing method and system {SATELITE IMAGE PROVIDING METHOD AND SYSTEM}

The present invention relates to a satellite image providing method and system, and more particularly, to a satellite image providing method and system that can quickly image the region of interest desired by the user.

Earth observation technology is a technology that can play an important role in the exploration of resources, environment monitoring and management that is closely related to human survival and is emerging as a very necessary technology for the society of present and future.

As the era of borderless countries and global competition enters the world, global observation technology is actively used for resource exploration and environmental management.

Recently, with the development of earth observation satellite imaging technology, it is possible to obtain high-precision, high-resolution satellite images from satellites.

High-resolution satellite images are very useful for crop monitoring and analysis, land management, mapping, defense security, environmental management, and location selection.

As the utilization of high resolution satellite images increases in various fields, the demand for obtaining the received images as quickly as possible increases.

However, according to the related art, even if a region of interest (ROI) desired by a user among the received satellite images is a part of the entire region, data of the entire region is processed and displayed.

Therefore, in that image processing must be performed not only on the ROI but also on the large-area data, there is a problem that the transmission processing time is delayed and power consumption is high.

Accordingly, an aspect of the present invention is to provide a satellite image providing method and a system which enables a user to easily designate a region of interest among satellite images and to quickly check image data of interest.

In accordance with one aspect of the present invention, there is provided a satellite image providing method comprising: generating row data from satellite image data and an image line including image line data obtained by dividing the generated row data by lines Generating and storing block data; generating and storing image line index data including storage location information of the image line data; transmitting the image line block data to a user terminal; Receiving information about an ROI set on a quick look image generated using block data from the user terminal, extracting image line data corresponding to the ROI from the image line block data, and transmitting the extracted image line data to the user terminal; only It includes the system.

The image line index data is a line number of the image line data and storage location information of the image line data are mapped, and the ROI information is a start image line number and an end image line number of the ROI set on the quick look image. Can be.

In the transmitting of the extracted image line data to the user terminal, preferably, the first image data obtained by decompressing the extracted image line data is transmitted.

The method may further include providing at least one of second image data obtained by radially correcting the first image data and third image data obtained by geometrically correcting the second image data.

Each of the steps is preferably carried out distributed by channel.

According to another aspect of the present invention, there is provided a phase spirituality providing system comprising: a demodulator configured to demodulate satellite image data to generate row data; A receiving processor for generating and storing image line index data including storage location information of the image line data, and receiving information about a region of interest set on the quick look image generated using the image line block data from the user terminal; And a region of interest data providing unit configured to transmit first image data extracted from the image line block data corresponding to the region of interest and decompressed to the user terminal.

The image line index data is a line number of the image line data and storage location information of the image line data are mapped, and the ROI information is a start image line number and an end image line number of an ROI set on the quick look image. Can be.

Preferably, the user terminal provides at least one of second image data obtained by radially correcting the first image data and third image data obtained by geometrically correcting the second image data.

As described above, according to the present invention, the user can easily designate a region of interest among the satellite image data and quickly identify image data of the region of interest.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

First, a satellite image providing system according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 is a block diagram of a satellite image providing system according to an embodiment of the present invention, Figure 2 is a flow chart of satellite image data according to an embodiment of the present invention.

As shown in FIG. 1, a satellite image providing system 100 according to an exemplary embodiment of the present invention may include a demodulator 110, an I channel workstation 120, a Q channel workstation 130, and a user terminal 140. Can be.

The demodulator 110 receives the compressed and encrypted satellite image data from a satellite (not shown) via an attached antenna (not shown), thereby allowing bit-sync, demodulation and I / Q channels. Separation is performed to generate data (raw data) in the form of raw images (S210). In this embodiment, the case where the data transmission modulation scheme uses the I / Q modulation scheme is described, but other data transmission modulation schemes may be used.

The demodulator 110 transmits raw data separated into I / Q channels to the I channel workstation 120 and the Q channel workstation 130, respectively.

The I channel workstation 120 includes a receiving card 122, a receiving processor 124, a region of interest data providing unit 126, and a storage unit 128.

The receiving card 122 receives the I channel component of the raw data from the demodulator 110.

The reception processor 124 is a software module for processing raw data transmitted from the reception card 122, and generates image line block data and image line index data (S220). , S230).

In more detail, the reception processor 124 performs a decoding process such as frame synchronization, de-randomization, channel decoding, and decryption processing on the raw data. Afterwards, the image line block data and the image line index data are generated and stored in the storage unit 128.

Here, the image line block data refers to a set of data (hereinafter, referred to as "image line data") compressed by dividing RAW data by image lines. The image line block data may include image information and image line number information of each image line of the RAW data. The image line index data may include physical location information in which corresponding image line data is stored in the storage unit 128, and the line number and physical location information of each image line data may correspond to each other. The image line index data is used to extract the image line data designated as the region of interest from the image line block data.

In addition, the reception processor 124 transfers the generated image line block data to the user terminal 140 to be used to represent a Quick Look Image.

The ROI data providing unit 126 (hereinafter referred to as an ROI provider) extracts image line data corresponding to the ROI designated by the user from the image line block data stored in the storage unit 128, and extracts the extracted image line data. The image line data is decompressed and transmitted to the user terminal 140 (S240). The decompressed data transmitted from the ROI provider 126 to the user terminal 140 is referred to as 'level 0 data'. That is, the level 0 data corresponds to a portion of the RAW data designated by the user as the region of interest.

The Q channel workstation 130 also includes a receiving card 132, a receiving processor 134, an ROI provider 136, and a storage 138, and image line block data and images of the Q channel components of the raw data. Except for dealing with line index data, the function is the same as that of the I-channel workstation 120, and thus redundant description will be omitted.

In addition, in the exemplary embodiment of the present invention, an example in which the workstation is divided into the I channel workstation 120 and the Q channel workstation 130 has been described. However, the workstation may be integrated into one workstation. It can be implemented in other forms.

Here, the I channel workstation 120 and the Q channel workstation 130 are distributed and perform data processing corresponding to the ROI, thereby rapidly generating an image of the ROI.

The user terminal 140 is an input / output for communicating with the I-channel workstation 120 and the Q-channel workstation 130, for receiving data and requesting data on a region of interest designated by the user. Means the device.

The user terminal 140 may be connected to the I-channel workstation 120 and the Q-channel workstation 130 by wire or wirelessly, for example, as well as a desktop computer, a laptop computer, a workstation, a palmtop computer, or the like. It can be implemented as a device that can send and receive information.

The user terminal 140 includes a controller 142, a viewer 144, and an ROI processor 146.

The controller 142 controls the overall operation of the system 100 and the user terminal 140 in association with the I channel workstation 120 and the Q channel workstation 130.

When the viewer unit 144 receives the image line block data, the viewer unit 144 decompresses and samples the sample line to express the quick look image in real time. In addition, the viewer unit 144 provides a Graphic User Interface (GUI) that allows a user to designate a region of interest on the quick look image.

The ROI processor 146 receives level 0 data of the ROI from the ROI providing units 126 and 136 and processes the level 0 data in a form requested by the user.

In more detail, the ROI processor 146 generates a level 1R data by performing radial correction on the level 0 data (S250).

Radiation correction is the conversion of raw digital numbers observed through the sensor into units with physical concepts. Radiation correction includes absolute correction, relative correction, and global atmospheric correction.

In addition, the ROI processor 146 generates level 1G data by performing geometric correction on the level 1R data using physical sensor modeling (S260).

Geometry correction is a process of processing the topographical shape of the screen and the position of the pixel of the output screen within a given error range and mainly using warping and modeling methods.

Then, the viewer unit 144 provides level 1R data or level 1G data to the user.

Meanwhile, an operation of the ROI processing system 100 of the satellite image is divided into a quick look image display process and a ROI display process by a user designation upon reception of the satellite image data, respectively, through FIGS. 3 to 7. The process of will be described.

3 is a flowchart illustrating a quick look image display process of the ROI processing system of a satellite image according to an exemplary embodiment of the present invention, and FIG. 4 is a diagram illustrating a relationship between an image line index and an image line block according to an exemplary embodiment of the present invention. to be.

In FIG. 3, for convenience of description, components necessary for the quick look image display process in the ROI processing system 100 of the satellite image are mainly shown.

As shown in FIG. 3, first, the I-channel workstation 120 and the Q-channel workstation 130 are separated into I-channels and Q-channels of satellite image data by receiving cards 122 and 132, respectively. Is received from the demodulator 110 (S310), raw data is transmitted to the receiving processors 124 and 134, respectively.

The reception processors 124 and 134 generate the image line block data and the image line index data through the decoding process and store the raw data in the storage units 128 and 138 (S320 and S330). As shown in FIG. 4, the image line index data records image line numbers and physical position information of image line data corresponding thereto.

The reception processors 124 and 134 transmit the image line block data to the viewer unit 144 of the user terminal 140 (S340).

The viewer unit 144 decompresses the transferred image line block data and displays the quick look image as shown in FIG. 5 through sampling, so that the user can briefly check the received image in real time.

5 is an exemplary view showing a viewer unit in which a quick look image is displayed according to an exemplary embodiment of the present invention.

FIG. 5 illustrates a viewer unit 144 displaying a quick look image. Since the quick look image is a large image, the quick look image cannot be loaded and displayed in the memory for the entire region.

Therefore, it is preferable to temporarily store the input image in a cache memory so that the user loads and displays only the region that the user wants to see.

As such, the user may check the real-time image through the quick look image shown in the viewer unit 144. The user may designate a region of interest through the quick look image as shown in FIG.

6 is an exemplary diagram illustrating a quick look image to which a region of interest is designated according to an embodiment of the present invention.

As illustrated in FIG. 6, a green line for designating a start line and an end line of the ROI may be displayed on the quick look image.

The user moves the start point and the end point with a mouse to designate a region of interest. In addition, an image line number indicating a position of an image line at a corresponding position is displayed around the start point and the end point. Of course, by providing an interface that can input the image line number for the start point and the end point on the screen, you can also receive the image line number directly from the user via the keyboard.

7 is a flowchart illustrating a process of displaying a region of interest of an ROI processing system of a satellite image according to an exemplary embodiment of the present invention.

In FIG. 7, for convenience of description, components necessary for the extraction process of the image line block of the ROI in the ROI processing system 100 of the satellite image are shown.

First, when a user designates a region of interest through the quick look image displayed on the viewer unit 144 in the same manner as in FIG. 6, the user terminal 140 uses the ROI providing units 126 and 136 to correspond to the start and end points. By passing the line number, a request is made to generate and transmit level 0 data for the ROI (S710).

The ROI providing units 126 and 136 extract data of the ROI designated by the user from the image line block data with reference to the image line index data in operation S720. That is, the storage location information of the image line data corresponding to the ROI is identified from the image line index data using the image line number transmitted from the user terminal, and the corresponding image line data is extracted from the storage units 128 and 138.

The ROI providing units 126 and 136 decompress the extracted image line block data to generate level 0 data and transmit the level 0 data to the ROI processor 146 (S730).

The ROI processor 146 generates and provides level 1R data or level 1G data requested by the user using the received level 0 data (S740).

As described above, according to an exemplary embodiment of the present invention, the user may easily designate a region of interest among the satellite image data, and may quickly identify image data of the region of interest.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a block diagram of a satellite image providing system according to an embodiment of the present invention.

2 is a flowchart of satellite image data according to an embodiment of the present invention.

3 is a flowchart illustrating a quick look image display process of the satellite image providing system according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a relationship between an image line index and an image line block according to an exemplary embodiment of the present invention.

5 is an exemplary view showing a viewer unit in which a quick look image is displayed according to an exemplary embodiment of the present invention.

6 is an exemplary diagram illustrating a quick look image to which a region of interest is designated according to an embodiment of the present invention.

7 is a flowchart illustrating a process of displaying a region of interest of a satellite image providing system according to an exemplary embodiment of the present invention.

Claims (8)

Generating raw data from the satellite image data; Generating and storing image line block data including image line data obtained by dividing the generated row data for each line; Generating and storing image line index data including storage location information of the image line data; Transmitting the image line block data to a user terminal; Receiving information about a region of interest set on the quick look image generated using the image line block data from the user terminal; And, Extracting image line data corresponding to the ROI from the image line block data and transmitting the extracted image line data to the user terminal; Satellite image providing method comprising a. The method of claim 1, In the image line index data, a line number of the image line data and storage location information of the image line data are mapped. And the ROI information is a start image line number and an end image line number of the ROI set on the quick look image. In claim 1, The transmitting of the extracted image line data to the user terminal may include: And transmitting first image data obtained by decompressing the extracted image line data. The method of claim 1, Providing at least one of second image data of which radial correction is performed on the first image data and third image data of which geometric correction of the second image data is performed; Satellite image providing method further comprises a. The method of claim 1, Wherein each step is performed by being distributed for each channel. A demodulator for demodulating satellite image data to generate raw data; A receiving processor configured to generate and store image line block data including image line block data including image line data compressed by dividing the generated row data for each line and storage position information of the image line data; And, A first image that receives information about a region of interest set on the quick look image generated using the image line block data from a user terminal, extracts image line data corresponding to the region of interest from the image line block data, and decompresses it An ROI data providing unit configured to transmit data to the user terminal; Satellite image providing system comprising a. The method of claim 6, In the image line index data, a line number of the image line data and storage location information of the image line data are mapped. And the ROI information is a start image line number and an end image line number of the ROI set on the quick look image. In claim 6, The user terminal may provide at least one of second image data obtained by radially correcting the first image data and third image data obtained by geometrically correcting the second image data. Image Provision System.

Images