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Non-destructive hidden transmission method for on-board data

A transmission method, data lossless technology, applied in the field of communication

Active Publication Date: 2013-04-03
XIAN INSTITUE OF SPACE RADIO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problem solved by the technology of the present invention is: to overcome the deficiencies of the existing on-board data transmission technology, aiming at the problem of on-board low-rate data transmission, a method for on-board data lossless and concealed transmission is proposed, and the method is used to embed low-rate data into high-speed images The ground receiver can correctly extract the low-rate data from the carrier image and restore the original high-rate remote sensing image data without distortion

Method used

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Embodiment

[0077] In order to verify the effect of the method of the present invention, a number of 8-bit grayscale images "City", "Coast", "Farm", "Nephogram", "Desert" and "Snow" with a size of 512×512 were used in the experiment for simulation . The degree of change of the cover image after hiding the secret information is expressed by the peak signal-to-noise ratio (PSNR).

[0078] The specific method is: divide the original carrier image into small blocks of 32×32, select two peaks (m=2), and embed them into a layer (L=1), the comparison between hidden capacity and peak signal-to-noise ratio (PSNR) The results are shown in Table 1. The pure load Pur is Pur=Cap-HS. Among them, Cap is the embedding capacity, and HS is the histogram translation information. Through a lot of experiments, it is found that the performance is the best when the image block size is 32×32. Analysis shows that this is because the smaller the image block, the stronger the correlation between pixels, the sma...

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Abstract

The invention discloses a non-destructive hidden transmission method for on-board data. The method comprises the following steps of: embedding low-speed data in an original high-speed remote sensing carrier image by modifying the adjacent-pixel difference histogram of the on-board high-speed remote sensing carrier image, and performing downlink transmission by virtue of a satellite high-speed data transmission system. A ground receiving end can correctly extract the low-speed data from the carrier image, and recover the original high-speed remote sensing carrier image in a non-destructive manner. According to the method disclosed by the invention, the utilization rate of a satellite data transmission system is increased and the hidden performance of on-board data transmission is enhanced on the premise of no increase of the complexity and the information transmission speed of the satellite data transmission system. Experimental results indicate that a high pure load embedding capacity in case of ensuring a good hidden performance can be obtained according to the method disclosed by the invention.

Description

technical field [0001] The invention belongs to the field of communication, and relates to a data transmission method of a spacecraft. Background technique [0002] With the advancement of aerospace technology and the development of information technology, the need for satellite data transmission technology is becoming more and more urgent, and the satellite data transmission rate is getting higher and higher. At present, the satellite high-speed data transmission rate can reach hundreds of megabits or even gigabits bps. At the same time, satellite platforms and on-board sensors have also developed from a single type to a diversified one. In addition to the need for high-speed data services, there are also some low-speed data (such as low-resolution remote sensing images, monitoring data generated by remote sensing satellites, data transmitted by other space vehicles through interstellar links, etc.) Downstream. If these low-rate data are downloaded through a separate sate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00H04N7/24
Inventor 李晓博周诠林鹏博
Owner XIAN INSTITUE OF SPACE RADIO TECH
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