Image decryption method, image encryption method, image decryption device, image encryption device, image decryption program, and image encryption program
An encryption device and image technology, applied in image communication, digital video signal modification, electrical components, etc., can solve problems such as inability to divide mode prediction, encryption compression rate reduction, etc., to achieve the effect of encryption/decryption efficiency and improvement of prediction accuracy
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Embodiment 1
[0070] Figure 8 It is a block diagram showing an example of the structure of the picture encryption device 100 in the first embodiment. Such as Figure 8 As shown, the image encryption device 100 in Embodiment 1 includes a prediction error signal generation unit 101, an orthogonal transformation unit 102, a quantization unit 103, an entropy encryption unit 104, an inverse quantization unit 105, an inverse orthogonal transformation unit 106, and a decrypted image generation unit 107, deblocking filter unit 108, picture memory 109, intra prediction image generation unit 110, inter prediction inter prediction image generation unit 111, motion vector calculation unit 112, encryption control, and header (header) generation part 113 and the predicted image selection part 114. The outline of each part is explained below.
[0071] The prediction error signal generation unit 101 acquires macroblock data (hereinafter referred to as MB) obtained by dividing an encryption target image...
Embodiment 2
[0098] Figure 11 It is a block diagram showing an example of the configuration of the image decryption device 300 in the second embodiment. The image decryption device 300 in the second embodiment decrypts the encrypted data encrypted by the image encryption device 100 in the first embodiment.
[0099] Such as Figure 11 As shown, the image decryption device 300 includes an entropy decryption unit 301, an inverse quantization unit 302, an inverse orthogonal transformation unit 303, an intra-frame prediction image generation unit 304, a decryption information storage unit 305, an inter-frame prediction image generation unit 306, a prediction image selection unit 307 , decrypted image generation unit 308 , deblocking filter unit 309 , and picture memory 310 . The outline of each part is explained below.
[0100] The entropy decryption unit 301 performs entropy decryption corresponding to the entropy encryption of the image encryption device 100 when a bit stream is input. T...
Embodiment 3
[0121] Next, the image encryption device in Embodiment 3 will be described. The structure of the image encryption device in embodiment 3 and Figure 8 The structures shown are the same, and for the functions related to the prediction of the division mode of the image encryption device in Embodiment 3, use the same as Figure 9 , 10 The same reference numerals in the functions are described.
[0122] Furthermore, in Embodiment 3, an application example of the method proposed for HEVC is shown. In this example, subdivision into code units (CUs) equivalent to conventional macroblocks, prediction units (PUs) obtained by further dividing the CU into prediction unit partitions, and further division into orthogonal transformation units in the CU Partitioned transform unit (TU).
[0123] First, the block partition configuration of the CU is scanned in a determined order. For scan order, consider quadtree partitioning of blocks, raster scan order. Figure 13 It is a figure explai...
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