01831nas a2200205   4500008004100000245008100041210006900122260000900191300001400200490000600214520114700220653002501367653003601392653001801428653001401446100001501460700001701475700001601492856011701508       2009                        eng d00aAn image copyright protection scheme using DCT and a table look-up technique0 aimage copyright protection scheme using DCT and a table lookup t  c2009  a358 - 3640 v73 aIn this paper, an image copyright protection scheme was proposed which will not involve watermark embedment in the host image. The proposed scheme is suitable for protecting precious image work where the host image should not be altered. Multiple copies of unruly black and white binary images were created by the XORed entwinement with the binary copyright logo (i.e., the watermark) and the binary characteristic extraction of host image's DCT-coefficients. The multiple copies of unruly binary images were then time-stamped with a digital signature and registered with a certified authority for protecting the rightful ownership. A giveup-table was employed to contain possible attacked host image locations and a simple table look-up operation was applied to select better candidates from the multiple copies of unruly binary images for recovering the watermark. Experimental testing will be conducted on attacks such as blurring, rescale, cropping, sharpening, noise, rotation, and JPEG lossy compression. Results showed that the watermark for proof of rightful ownership can be recovered at a high NC > 0.95 and is visually undistorted.10aCopyright protection10aDiscrete cosine transform (DCT)10aTable look-up10aWatermark1 aLin, C.-N.1 aChang, C.-C.1 aTsai, M.-T.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-79960672480&partnerID=40&md5=d3494694cccbe120402c83a50046601c