Patent ID: 8279938

Claim:
An image signal processing device, comprising: a decoder that decodes encoded sub image data into which second aspect ratio information has been inserted, said second aspect ratio information being able to be set independently from first aspect ratio information that is inserted into main image data; and a processor that decides an image frame size of said sub image based on third aspect ratio information and said second aspect ratio information, said third aspect ratio information being aspect ratio information of a display section that displays said main image and said sub image in a superimposing manner, wherein said processor decides the image frame size of said sub image to be said first aspect ratio, if said third aspect ratio information represents a first aspect ratio, wherein said processor decides the image frame size of said sub image to be said second aspect ratio, if said third aspect ratio information represents a second aspect ratio and if said second aspect ratio information denotes that it is capable of any one of said first aspect ratio and said second aspect ratio, wherein said processor decides the image frame size of said sub image to be said second aspect ratio, if said third aspect ratio information represents said second aspect ratio and if said second aspect ratio information represents said second aspect ratio, and wherein said processor decides the image frame size of said sub image to be said first aspect ratio, if said third aspect ratio information represents said second aspect ratio and if said second aspect ratio information represents said first aspect ratio.