Based On The Fractional Fourier Transform Of The Digital Image Hiding Technology

With the rapid development of internet and digital mutimedia information exchan-ge has been the unprecedented depth and breadth,specially with the combination of communications technology and comper,and it has brought great convenience to the dissmination and use of information.But there has also been a number of information security issues.Therefore,the protection of secret information is imperative. At present,in the transmission process,how to protectthe security of the information has become an important issue facing.Information Hiding Technique is an effective means to address information security issues.It is to hide secret information for transmission,thus the information confidential.Be analyzed and summarized on the basis of image-based hidden tecchnology,the basic concepts and theories,and because the human visual sensitivity is relatively weak.So the image file as an ideal information hidden vector.Hidden image-based information technology are mainly two methods of the space domain and transform domain.This is the hidden pieces of the image based on Fractional Fourier Transform is the Discrete Fractional Fourier Transform of the image hidden. Fractional Fourier Transform of the airspace and the ability to frequency domain dual-domain expression can order Fractional Fourier Transform of the original image and vector images to enhance the security of the hidden image.First discrete Fractional Fourier Transform(different order).respectively,to the original image and vector images.the image fusion in the frequency domain,using Fractional Fourier Anti-transform the image was transformed into the time domain, see the image is the fusion of images.The image is actually embedded images of the anti-process, due to an embedded image has a specific location,so it is easy to be able to hide images,then the image in the frequency dimain using Fractional Fourier inverse transform converted to time domain,so basic to complete the entire process. The selection of vector images are symmetrical images.It contains vector image information contains hidden information, so just transfer a fusion image will be able to achieve the image hidden. In addition,the correlation coefficient to evaluate hidden in the decrypted image quality and integration of images and vector images of hidden information.