Method and device for enabling users to communicate image information based on Beidou short message system

Abstract

The invention relates to a method and device for enabling users to communicate image information based on a Beidou short message system, and the method comprises the steps: compressing an original detection image obtained by an A-site terminal to a magnitude order of dozens of KB through a guide type compression method, only keeping effective data slices of the original detection image, and removing the redundant information of the image; carrying out quantitative subpackaging on the image data after guiding type compression, carrying out approximate representation on a sampling value according to a set rule, and segmenting the image data into a data format suitable for a Beidou short message; encoding the quantized and subpackaged data, and putting the encoded code stream into a Beidou short message system for transmission; and the B terminal receives the coded code stream, sequentially executes the processes of data decoding, data packing and data decompression, recovers the effective information of the detection image, and completes the image information intercommunication. According to the invention, the interoperability of image information among RD terminals in a global range is improved, and efficient and stable image transmission is realized by using a Beidou short message system.

Description

Technical Field

[0001] The present invention belongs to the technical field of information processing, and relates to a method and a device for enabling users to communicate image information with each other based on a Beidou short message system. Background Art

[0002] The Beidou Navigation and Positioning System is a satellite navigation and positioning system independently developed by my country. The system focuses on providing users with two types of services: satellite radio determination satellite service (Radio Determination Satellite Service, RDSS) and satellite radio navigation service (Radio Navigation Satellite Service, RNSS).

[0003] The function of Beidou short message is a unique function of Beidou navigation and positioning system, and it is also one of the business functions of RDSS. Its business form is similar to the short message service provided by domestic operators. It mainly uses Beidou's two-way communication function to realize two-way short digital message communication between users and users, and users and central control systems. Beidou short message can currently publish 1,000 words of information, which can not only locate users, but also display the location of users. With the improvement and development of Beidou navigation and positioning system, the intercommunication scope of Beidou short message and mobile short message is no longer limited to my country and its surrounding areas, but gradually expanded to the global scope. Select RD terminal with RD module to send and receive Beidou short message. RD terminal can only use Beidou short message for communication, so RD terminal cannot send and receive mobile short message and Beidou short message at the same time. In addition, the maximum communication bandwidth of Beidou short message system is 14Kb, and an image is of value only when the minimum size is 50KB. Therefore, the current technology cannot use RD terminals to communicate image information.

[0004] Therefore, it is necessary to design a method based on the Beidou short message system to enable Beidou terminal users to exchange image information to solve the above problems. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art, to propose a method and device for users to exchange image information based on the Beidou short message system, to achieve guided data extreme compression of the detection image acquired at place A without relying on communication satellites, to divide the compressed code stream into a data format suitable for the Beidou short message, and to transmit it from place A to place B through the Beidou short message system, thereby improving the interoperability of image information between RD terminals worldwide.

[0006] The solution to the technical problem of the present invention is: a method for enabling users to communicate image information based on the Beidou short message system, comprising the following steps:

[0007] The original detection image acquired by the terminal at site A is compressed to the order of tens of KB by using a guided compression method, retaining only valid data slices of the original detection image and removing redundant image information;

[0008] The image data after guided compression is quantized and divided into packets, and the sampled values ​​are approximately represented according to the set rules, and the image data is divided into data formats suitable for Beidou short messages;

[0009] Encode the quantized and packetized data, and put the encoded code stream into the Beidou short message system for transmission;

[0010] The terminal at location B receives the encoded code stream, and performs data decoding, data packaging and data decompression processes in sequence to restore the valid information of the detection image and complete the image information exchange; wherein location A and location B are any two points in the world.

[0011] Furthermore, the guided compression method is used to compress the original detection image acquired by the terminal at site A to the order of tens of KB, including:

[0012] A multi-category ROI adaptive coding method based on discrete wavelet transform is designed in combination with frequency domain features. Discrete wavelet transform is used to separate target features and environmental features. During encoding, bit rate is only allocated to environmental features, while target features remain unchanged, so as to achieve extreme compression without losing target information.

[0013] Furthermore, the step of quantizing and packaging the image data after guided compression includes:

[0014] Quantify and sub-packetize the compressed code stream according to the Beidou short message communication capability: Assuming that the size of the image data after guided compression is XKB, and the maximum communication bandwidth of the Beidou short message system is YKb, the image data is divided into Packet data.

[0015] Furthermore, the encoded code stream is encrypted before being transmitted in the Beidou short message system: for each packet of data after packetization, a characteristic character is inserted at a specific byte position during transmission, and after receiving the packet, the characteristic character is removed and then decoded to achieve encryption protection of valid information.

[0016] Furthermore, the data packaging method is as follows:

[0017] If a small amount of subpacket data is lost after the terminal at location B completes the reception, then if all subpacket data is not received correctly, the lost data packet will be supplemented with partial black information, and most of the image information will be restored and then decompressed.

[0018] Furthermore, if the sub-packet data is not received correctly, the decompressed image does not meet the receiving requirements and lacks key target information, the following operations are performed:

[0019] The terminal at site B requests the terminal at site A to resend the lost sub-packet data through the Beidou short message system, and the terminal at site A responds to the sending request; after receiving the sub-packet data resent by the terminal at site A, the terminal at site B combines it with the stored historical sub-packet data, restores all the image information, and then decompresses it again.

[0020] A device for users to communicate image information based on the Beidou short message system, including an image compression module, a quantization subpackaging module, a data encoding module, an encryption module, a transmission module, a data decoding module, a data packaging module and a data decompression module;

[0021] Image compression module: compresses the original detection image obtained by the terminal at site A to the order of tens of KB through a guided compression method, retaining only valid data slices of the original detection image and removing redundant image information;

[0022] Quantization and Packetization Module: Quantize and packetize the image data after guided compression, approximate the sampling values ​​according to the set rules, and divide the image data into data formats suitable for Beidou short messages;

[0023] Data encoding module: encodes the quantized and packetized data;

[0024] Encryption module: encrypt the encoded code stream;

[0025] Transmission module: puts the encrypted code stream into the Beidou short message system for transmission;

[0026] Data decoding module: located at the terminal at site B, it decodes the data after receiving the transmitted code stream;

[0027] Data packaging module: Packaging the decoded data;

[0028] Data decompression module: decompresses the packaged data and restores the valid information of the detection image.

[0029] Furthermore, the image compression module specifically performs:

[0030] A multi-category ROI adaptive coding method based on discrete wavelet transform is designed in combination with frequency domain features. Discrete wavelet transform is used to separate target features and environmental features. During encoding, bit rate is only allocated to environmental features, while target features remain unchanged, so as to achieve extreme compression without losing target information.

[0031] Furthermore, the quantization and packetization module quantizes and packets the compressed code stream according to the Beidou short message communication capability: Assuming that the size of the image data after guided compression is XKB, the maximum communication bandwidth of the Beidou short message system is YKb, and the image data is divided into Packet data.

[0032] Furthermore, the data packaging module specifically performs:

[0033] If a small amount of sub-packet data is lost after receiving at the terminal at location B, if the sub-packet data is not received correctly, the lost data packet is supplemented with partial black information, and most of the image information is restored and then decompressed;

[0034] If the decompressed image does not meet the reception requirements and lacks key target information when not all the subpacket data are received correctly, the following will be executed: the terminal at site B requests the terminal at site A to resend the lost subpacket data through the Beidou short message system, and the terminal at site A responds to the sending request; after receiving the subpacket data resent by the terminal at site A, the terminal at site B combines it with the stored historical subpacket data, restores all the image information, and then decompresses it again.

[0035] The beneficial effects of the present invention compared with the prior art are:

[0036] (1) The present invention adopts an advanced image compression algorithm to compress the original image to less than 50KB while maintaining high image quality, meeting the requirements of the Beidou short message system for data transmission efficiency and quality.

[0037] (2) The present invention realizes the segmentation of a 50KB compressed image into files of a format and size transmittable by the Beidou short message system, thereby expanding the image information intercommunication scheme between Beidou short message terminals; and utilizes the Beidou short message system to realize efficient and stable image transmission, which is a significant technical improvement compared to traditional methods.

[0038] (3) The present invention optimizes the transmission protocol based on the characteristics of the Beidou short message system, and improves the stability and reliability of data transmission. To ensure the security of data transmission, the present invention adopts advanced encryption technology during the transmission process to effectively prevent data leakage and illegal interception. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is an inbound communication link;

[0040] Figure 2 is the outbound communication link;

[0041] Figure 3 A flow chart of a method for enabling users to communicate image information based on the Beidou short message system;

[0042] Figure 4 Schematic diagram of the working process of the system of the present invention. DETAILED DESCRIPTION

[0043] The purpose of the present invention is to provide a method and device for Beidou short message RD terminals and RD terminals to communicate image information with each other, so as to improve the interoperability of image information between RD terminals worldwide.

[0044] Beidou's global short message communication function is a special function that neither the US GPS nor the Russian GLONASS have. It is the world's first satellite navigation system that has integrated message communication in addition to positioning and timing. The Beidou satellite navigation system's global short message provides downlink outbound communication services through 24 MEO and 3 IGSO satellites, and 14 MEO satellites equipped with short message payloads provide uplink inbound communication services. Short message user terminals can send and receive short messages with other terminals in the system through Beidou MEO satellites. The signal sending process of ground terminal A is sending terminal->MEO satellite->ground master control station->MEO satellite->ground terminal B. Figure 1 , Figure 2 shown.

[0045] The invention is to compress the captured image through guided compression, compress the 300M image of the terminal at place A into a 50KB image, realize guided data extreme compression of the detection image obtained at place A, divide the compressed code stream into a data format suitable for Beidou short message, and transmit it from place A to place B through the Beidou short message system, where place A and place B can be any two points in the world. After the divided code stream is transmitted to place B through Beidou, the code stream data is merged, decompressed, and the original image format is restored. Figure 3 The block diagram of the encoding and decoding process of image compression is introduced, and the working process of the system of the present invention is shown in Figure 4 .

[0046] The present invention will be further described below in conjunction with the embodiments.

[0047] Example 1

[0048] like Figure 3 As shown, the present embodiment proposes a method for enabling users to communicate image information based on the Beidou short message system, comprising the following steps:

[0049] S1. Compress the original detection image obtained by the terminal at site A to the order of tens of KB by using a guided compression method, retain only valid data slices of the original detection image, and remove redundant image information;

[0050] S2. quantize and packetize the image data after guided compression, approximate the sampled values ​​according to the set rules, and divide the image data into a data format suitable for Beidou short messages;

[0051] S3, encode the quantized and packetized data, and put the encoded code stream into the Beidou short message system for transmission;

[0052] S4. The terminal at site B receives the encoded code stream, and performs data decoding, data packaging and data decompression processes in sequence to restore the valid information of the detection image and complete the image information exchange.

[0053] Among them, in step S1, the original detection image obtained by the terminal at site A is compressed to the order of tens of KB by a guided compression method, which is specifically achieved by the following method:

[0054] A new multi-category ROI (Region of Interest) encoding method is used to achieve ROI encoding in complex scenes. A multi-category ROI adaptive encoding method based on discrete wavelet transform is designed in combination with frequency domain features. Discrete wavelet transform is used to separate target features and environmental features. During encoding, only the environmental features are allocated bit rate, while the target features remain unchanged. This ensures that ultra-large-scale compression (extreme compression) is achieved without losing target information.

[0055] In step S2, the image data after guided compression is quantized and divided into packets, and the compressed code stream is quantized and divided into packets according to the Beidou short message communication capability: Assuming that the size of the image data after guided compression is XKB, the maximum communication bandwidth of the Beidou short message system is YKb, and the image data is divided into Packet data.

[0056] In step S3, the encoded code stream is encrypted by the following method before being transmitted in the Beidou short message system: for each packet of data after packetization, a characteristic character is inserted at a specific byte position during transmission, and after receiving the packet, the characteristic character is removed and then decoded to achieve encryption protection of valid information.

[0057] In step S4, the method of data packaging is as follows:

[0058] If a small amount of subpacket data is lost after the terminal at location B completes the reception, then if all subpacket data is not received correctly, the lost data packet will be supplemented with partial black information, and most of the image information will be restored and then decompressed.

[0059] If the image decompressed by the above method does not meet the reception requirements and lacks key target information, perform the following operations:

[0060] The terminal at site B requests the terminal at site A to resend the lost sub-packet data through the Beidou short message system, and the terminal at site A responds to the sending request; after receiving the sub-packet data resent by the terminal at site A, the terminal at site B combines it with the stored historical sub-packet data, restores all the image information, and then decompresses it again.

[0061] Through the above methods, the timeliness and fault tolerance of image transmission are improved, meeting the requirements of the Beidou short message system for data transmission efficiency and quality.

[0062] This embodiment proposes a device for users to communicate image information based on the Beidou short message system, including an image compression module, a quantization subpackaging module, a data encoding module, an encryption module, a transmission module, a data decoding module, a data packaging module and a data decompression module; the system workflow diagram is as follows Figure 4 As shown, where:

[0063] Image compression module: compresses the original detection image obtained by the terminal at site A to the order of tens of KB through a guided compression method, retaining only valid data slices of the original detection image and removing redundant image information;

[0064] Quantization and Packetization Module: Quantize and packetize the image data after guided compression, approximate the sampling values ​​according to the set rules, and divide the image data into data formats suitable for Beidou short messages;

[0065] Data encoding module: encodes the quantized and packetized data;

[0066] Encryption module: encrypt the encoded code stream;

[0067] Transmission module: puts the encrypted code stream into the Beidou short message system for transmission;

[0068] Data decoding module: located at the terminal at site B, it decodes the data after receiving the transmitted code stream;

[0069] Data packaging module: Packaging the decoded data;

[0070] Data decompression module: decompresses the packaged data and restores the valid information of the detection image.

[0071] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0072] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A method for enabling users to communicate image information based on the Beidou short message system, characterized in that: The following steps are involved: The original detection image acquired by the terminal at site A is compressed to the order of tens of KB by using a guided compression method, retaining only valid data slices of the original detection image and removing redundant image information; The image data after guided compression is quantized and divided into packets, and the sampled values ​​are approximately represented according to the set rules, and the image data is divided into data formats suitable for Beidou short messages; Encode the quantized and packetized data, and put the encoded code stream into the Beidou short message system for transmission; The terminal at location B receives the encoded code stream, and performs data decoding, data packaging and data decompression processes in sequence to restore the valid information of the detection image and complete the image information exchange; wherein location A and location B are any two points in the world.

2. The method for enabling users to communicate image information based on the Beidou short message system according to claim 1, characterized in that: The method of compressing the original detection image acquired by the terminal at site A to the order of tens of KB by using the guided compression method includes: A multi-category ROI adaptive coding method based on discrete wavelet transform is designed in combination with frequency domain features. Discrete wavelet transform is used to separate target features and environmental features. During encoding, bit rate is only allocated to environmental features, while target features remain unchanged, so as to achieve extreme compression without losing target information.

3. The method for enabling users to communicate image information based on the Beidou short message system according to claim 1, characterized in that: The step of quantizing and packaging the image data after guided compression includes: Quantify and sub-packetize the compressed code stream according to the Beidou short message communication capability: Assuming that the size of the image data after guided compression is XKB, and the maximum communication bandwidth of the Beidou short message system is YKb, the image data is divided into Packet data.

4. The method for enabling users to communicate image information based on the Beidou short message system according to claim 1, characterized in that: Before the encoded code stream is transmitted in the Beidou short message system, the following encryption method is also adopted: for each packet of data after packetization, a characteristic character is inserted at the specific byte position of the transmission, and after the packet is received, the characteristic character is removed and then decoded to achieve encryption protection of valid information.

5. The method for enabling users to communicate image information based on the Beidou short message system according to claim 1, characterized in that: The data packaging method is as follows: If a small amount of subpacket data is lost after the terminal at location B completes the reception, then if all subpacket data is not received correctly, the lost data packet will be supplemented with partial black information, and most of the image information will be restored and then decompressed.

6. The method for enabling users to communicate image information based on the Beidou short message system according to claim 5, characterized in that: If the sub-packet data is not received correctly, the decompressed image does not meet the reception requirements and lacks key target information, then perform the following operations: The terminal at site B requests the terminal at site A to resend the lost sub-packet data through the Beidou short message system, and the terminal at site A responds to the sending request; after receiving the sub-packet data resent by the terminal at site A, the terminal at site B combines it with the stored historical sub-packet data, restores all the image information, and then decompresses it again.

7. A device for enabling users to communicate image information based on the Beidou short message system, characterized in that: It includes an image compression module, a quantization subpackaging module, a data encoding module, an encryption module, a transmission module, a data decoding module, a data packaging module and a data decompression module; Image compression module: compresses the original detection image obtained by the terminal at site A to the order of tens of KB through a guided compression method, retaining only valid data slices of the original detection image and removing redundant image information; Quantization and Packetization Module: Quantize and packetize the image data after guided compression, approximate the sampling values ​​according to the set rules, and divide the image data into data formats suitable for Beidou short messages; Data encoding module: encodes the quantized and packetized data; Encryption module: encrypt the encoded code stream; Transmission module: puts the encrypted code stream into the Beidou short message system for transmission; Data decoding module: located at the terminal at site B, it decodes the data after receiving the transmitted code stream; Data packaging module: Packaging the decoded data; Data decompression module: decompresses the packaged data and restores the valid information of the detection image.

8. The device for enabling users to communicate image information based on the Beidou short message system according to claim 7, characterized in that: The image compression module specifically implements: A multi-category ROI adaptive coding method based on discrete wavelet transform is designed in combination with frequency domain features. Discrete wavelet transform is used to separate target features and environmental features. During encoding, bit rate is only allocated to environmental features, while target features remain unchanged, so as to achieve extreme compression without losing target information.

9. The device for enabling users to communicate image information based on the Beidou short message system according to claim 7, characterized in that: The quantization and packetization module quantizes and packets the compressed code stream according to the Beidou short message communication capability: Assuming that the size of the image data after guided compression is XKB, the maximum communication bandwidth of the Beidou short message system is YKb, and the image data is divided into Packet data.

10. The device for enabling users to communicate image information based on the Beidou short message system according to claim 7, characterized in that: The data packaging module is specifically implemented as follows: If a small amount of sub-packet data is lost after receiving at the terminal at location B, if the sub-packet data is not received correctly, the lost data packet is supplemented with partial black information, and most of the image information is restored and then decompressed; If the decompressed image does not meet the reception requirements and lacks key target information when not all the subpacket data are received correctly, the following will be executed: the terminal at site B requests the terminal at site A to resend the lost subpacket data through the Beidou short message system, and the terminal at site A responds to the sending request; after receiving the subpacket data resent by the terminal at site A, the terminal at site B combines it with the stored historical subpacket data, restores all the image information, and then decompresses it again.

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