Recently, several digital watermarking techniques have been proposed for hiding data in the frequency\ndomain of moving image files to protect their copyrights. However, in order to detect the\nwater marking sufficiently after heavy compression, it is necessary to insert the watermarking\nwith strong intensity into a moving image, and this results in visible deterioration of the moving\nimage. We previously proposed an authentication method using a discrete wavelet transform for a\ndigital static image file. In contrast to digital watermarking, no additional information is inserted\ninto the original static image in the previously proposed method, and the image is authenticated\nby features extracted by the wavelet transform and characteristic coding. In the present study, we\ndeveloped an authentication method for a moving image by using the previously proposed method\nfor astatic image and a newly proposed method for selecting several frames in the moving image.\nNo additional information is inserted into the original moving image by the newly proposed method\nor into the original static image by the previously proposed method. The experimental results\nshow that the proposed method has a high tolerance of authentication to both compressions\nand vicious attacks.
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