Invention Grant
- Patent Title: Image encryption apparatus and image decryption apparatus
- Patent Title (中): 图像加密装置和图像解密装置
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Application No.: US12411606Application Date: 2009-03-26
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Publication No.: US08306221B2Publication Date: 2012-11-06
- Inventor: Jun Takahashi , Taizo Anan , Kensuke Kuraki , Shohei Nakagata
- Applicant: Jun Takahashi , Taizo Anan , Kensuke Kuraki , Shohei Nakagata
- Applicant Address: JP Kawasaki
- Assignee: Fujitsu Limited
- Current Assignee: Fujitsu Limited
- Current Assignee Address: JP Kawasaki
- Agency: Staas & Halsey LLP
- Priority: JP2008-093978 20080331
- Main IPC: G06F21/00
- IPC: G06F21/00

Abstract:
In an image encryption apparatus for visually encrypting an input image, an encryption area selector selects an encryption area within an input image including an area to be encrypted. An image converter divides the encryption area into a plurality of blocks. The image converter divides each block of the encryption area into a plurality of sub-blocks. An image converter performs an image conversion including rotation and mirror-reverse in accordance with an encryption key on the image in each sub-block. The image converter scrambles the image on a block-by-block basis in accordance with the encryption key. A pixel value converter converts a pixel value of a minimal area in a block so that a position of the block may be detected.
Public/Granted literature
- US20090245513A1 IMAGE ENCRYPTION APPARATUS AND IMAGE DECRYPTION APPARATUS Public/Granted day:2009-10-01
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