http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Location Map-Free Reversible Data Hiding Method Inserting Data to Image Edges
Michihiko ONO,Masaaki FUJIYOSHI,Hitoshi KIYA 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper proposes a reversible data hiding method that embeds data to image edges. The proposed method once distorts an original image to embed data, it restores the original image as well as extracts hidden data from the image conveying hidden data. To extract data and to recover the original image, this method memorizes only one parameter and does not require any location map that records the positions conveying hidden data. Differing from the conventional method having these features, the proposed method is able to hide data to only image edges. Simulation results show the effectiveness of the proposed method.
A Geometric Compensation Method for Image Watermarking Schemes and Its Required Accuracy
Shouhei KAMIMURA,Masaaki FUJIYOSHI,Hitoshi KIYA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a geometric compensation method for improving the watermark extraction ability. The proposed method is independent of watermarking schemes, whereas the conventional approach makes the particular watermarking scheme resistant to geometric deformation. The proposed method estimates geometric parameters by phase-only correlation technique using the original image rather than the stego image in which watermark is hidden. The required accuracy for geometric estimation is investigated by computer simulation, and performances are evaluated using real printed-and-scanned images.
Reversible Data Hiding with Hierarchical Access Control for Medical Imagery
Seungwu HAN,Masaaki FUJIYOSHI,Haekwang KIM,Hitoshi KIYA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a reversible data hiding method for supporting hierarchical control of access to data embedded in a medical image. The proposed method firstly hides the most important information to a medical image by the reversible manner in which information is enciphered. To the stego image to which once information is hidden, this method embeds different information that is enciphered with a different key. In the proposed method, only one key corresponding to the most important data is managed, and other keys are generated from the managed key through a one-way hash function. The privileged user such as the attending doctor receives the managed key and he/she extracts and deciphers all hidden data, whereas the unprivileged user like an ordinary nurse receives a key that for the least important data. The proposed method also has tamper detection ability. Simulation results show the effectiveness of the proposed method.
Sign Summation Image and Its Application to Robust Image Registration
Atsushi UEMURA,Masaaki FUJIYOSHI,Kiyoshi NISHIKAWA,Hitoshi KIYA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes sign summation (SS) images for robust image registration against noises. An SS image is generated as the summation of the signs of the differences between the focused pixel and some of its neighboring ones. For image registration in subpixel accuracy, phase-only correlation or cross-correlation is applied to SS images rather than nonprocessed images. Experimental rusults show that SS imaging improves estimation accuracy, whereas median filter, a well-known impulse noise suppression filter, degrades the accuracy.
Improvement in the Image Quality and the Capacity of the Reversible Data Hiding
Hong Lin JIN,Masaaki FUJIYOSHI,Hitoshi KIYA 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper proposes a reversible data hiding method in the spatial domain. A reversible data hiding method not only extracts hidden data from a stego image that conveys data but also restores the original image. The proposed method modulates pixel values adaptively and reversibly before an embedding process to improve the image quality of a stego image and simultaneously to increase the capacity. Simulation results show the effectiveness of the proposed method.