Patent ID: 8310506

Claim:
An optical disk device, comprising: read means which reads in image data of first aspect ratio from an input port or an optical disk; image synthesis means which creates combined image data of a second aspect ratio by adding mask bands with a first color at the sides of, or above and below, an image which is based upon the image data of the first aspect ratio read in by the read means; and output means which outputs the combined image data at the second aspect ratio which has been synthesized by the image synthesis means; wherein: the output means is connected to a display device which displays an combined image which is based upon the combined image data which has been outputted at the second output ratio; and the image synthesis means changes a color of the mask bands from the first color to a second color which is different from the first color at a timing when the bit rate of the image data read in by the read means changes by greater than or equal to a fixed value.