Patent ID: 8433067
Filing Date: 2013-04-30
Classification: G09C,H04N

Abstract:
1. An image encryption device that encrypts a digital image into an encrypted image, comprising: encryption area specifying means for specifying a partial area to be encrypted in the digital image; image conversion means for converting the partial area selected by the encryption area specifying means into a processed image on the basis of an encryption key; pixel value conversion means for generating a converted image by regularly converting pixel values of the processed image obtained through the conversion by the image conversion means so that a position of the partial area can be located; and marker setting means for setting a specified marker in the converted image generated by the pixel value conversion means, wherein: the image conversion means converts the partial area into compressed data using an arbitrary compression method, and arranges each bit of the converted compressed data as a white pixel or a black pixel of an arbitrary size, and the pixel value conversion means converts the pixel values in a constant cycle in horizontal and vertical directions in the processed image and generates a converted image substantially representing a checkerboard pattern.