Dynamic image encryption device, dynamic image encryption method, dynamic image decryption device, and dynamic image decryption method
A dynamic image and encryption device technology, which is applied in image communication, digital video signal modification, electrical components, etc., can solve the problem of increasing the amount of dynamic image data, and achieve the effect of improving encryption efficiency
Active Publication Date: 2016-05-11
FUJITSU LTD
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[0009] However, in recent years, the number of pixels of each picture included in the video data has increased in response to the improvement in the demand for higher image quality of the video, and as a result, the data volume of the video data has also tended to increase.
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[0051] Hereinafter, a video encryption device and a video decryption device according to each embodiment will be described with reference to the drawings. In general, the party that wants to encrypt a symbol whose probability distribution deviates can transmit the symbol with a small amount of information, which is expressed by Shannon's law (Shannon). That is, the more deviated the probability distribution of the symbol to be encrypted is, the higher the compression efficiency is for the data sequence including the symbol.
[0052] In view of this, the inventors studied a technique of encrypting information with deviations in the probability distribution instead of directly encrypting the frequency coefficient obtained for the prediction error image. As a result, the inventors came to the insight that there is a bias in the probability distribution of the sign agreement information indicating the positive and negative sign of the frequency coefficient of the prediction error ...
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The video encryption device includes: a predicted image generating unit that generates a predicted image for an encryption target block based on an encrypted picture included in the video data or an encrypted area of an encryption target picture; and a prediction error image generating unit that generates generating a prediction error image of the block to be encrypted by performing a differential operation between the block to be encrypted and the predicted image; a prediction error orthogonal transformation unit for calculating a plurality of first frequency coefficients by performing orthogonal transformation on the prediction error image; a predictive image orthogonal transform unit, which calculates a plurality of second frequency coefficients by performing orthogonal transform on the predictive image; a sign determination unit, which determines the sign of the plurality of second frequency coefficients; and an adaptive encryption unit, It encrypts a plurality of first frequency coefficients by using sign coincidence information, wherein the sign coincidence information indicates the positive and negative signs of each of the plurality of first frequency coefficients and the first frequency of the plurality of second frequency coefficients. Whether the positive and negative signs of the frequency coefficients represented by the frequency components with the same coefficient are consistent.
Description
technical field [0001] The present invention relates to, for example, a video encryption device, a video encryption method, and a video encryption computer program for encrypting video data using a predictive encryption method. Also, the present invention relates to, for example, a video decryption device, a video decryption method, and a video decryption computer program for decrypting video data encrypted by a predictive encryption method. Background technique [0002] Dynamic image data generally has a very large data volume. Therefore, a device that handles video data compresses the video data by high-energy encryption when it intends to transmit the video data to other devices or to store the video data in a storage device. "High-efficiency encryption" is an encryption process that converts a certain data column into another data column, and refers to processing that compresses the data volume of the original data column. [0003] As a representative moving image encr...
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IPC IPC(8): H04N19/126H04N19/14H04N19/18H04N19/48H04N19/136H04N19/147H04N19/423H04N19/46H04N19/50H04N19/503H04N19/523H04N19/593H04N19/60H04N19/61H04N19/70H04N19/91
CPCH04N19/126H04N19/14H04N19/18H04N19/48H04N19/625H04N19/124
Inventor 中川章数井君彦三好秀诚小山纯平岛田智史
Owner FUJITSU LTD