標題: 多張影像的低儲存快速解碼分享與比例顯像分享;被壓縮影像在頻率域的驗證與修復;多功能的混合型視覺加密分享
Space-Saving Fast-Decoding Sharing and Scalable/Progressive Sharing of Multiple Images; Authentication and Recovery of Compresses Images; Multi-Purpose Hybrid Visual Cryptography
作者: 林志青
LIN JA-CHEN
國立交通大學資訊工程學系(所)
關鍵字: 多張影像分享;低儲存空間快速解碼;逐張顯像。;Sharing of multi-images;economic space;fast decoding;image-by-image decoding.
公開日期: 2011
摘要: 本計畫為期三年,其目的是提出影像分享、修復及視覺加密技術。本年(第一年)的主題是多張影像的「低儲存空間快速解碼型」分享與「比例顯像型」分享。在第一主題中,我們提出以下系統:在單一編碼過程中分享掉多張影像,要求具有以下兩個時空並進的優點: (1).空間優勢:影像總輸入的大小與影像總輸出的大小比例(I/O size ratio)提高為1,亦即 1:1;(2).時間優勢:重建每個像素都只要常數次的運算,亦即O(1) ,因而不受影像張數影響。第一年第二個主題是多張影像的比例顯像型分享。在本主題中,我們希望設計出一種漸進式解碼方式,當取得t1份的JPEG偽裝碼時,可以解回第1群的所有影像。當取得t2(>t1)份的JPEG偽裝碼時,可以解回第1群和第2群的所有影像。我們提出的多張影像分享法,同時擁有漸進式解碼、無失真還原(當收集到大部份的偽裝碼時)、以及儲存空間小的優點,所以非常適合將分享後之分存隱藏至偽裝媒體(stego media),不會對要被藏入資料的媒體影像品質有顯著的影響。
This project is the first part of a three-year project. In Year 1, we deal with the following two topics: Topic A: design a space-saving fast-decoding sharing method for multiple images. This lossless method has two advantages simultaneously: (i) space: I/O size ratio is as high as 1:1;(ii) speed: reconstructing a pixel only needs a constant number of operations; and the number is independent of the number of secret images. (No reported lossless sharing method owns these two advantages simultaneously.) Topic B: design a multiple-images sharing method which has image by image security-dependent progressive decoding, lossless reconstruction of secret (when most of the shadows are collected), and compact size of shadows. An application of this topic is that, in a meeting, if some people are late, once the number of attendance has reached a threshold, some less important images can be decoded and discussed. When more and more people attend the meeting, the more important images can be decoded and discussed.
官方說明文件#: NSC100-2221-E009-141-MY3
URI: http://hdl.handle.net/11536/99533
https://www.grb.gov.tw/search/planDetail?id=2342363&docId=369300
Appears in Collections:Research Plans