Template-based watermarking method for depth-image-based rendering based 3d image and apparatus thereof

A method of extracting a watermark based on a template, the method comprising:

• rescaling a watermark extracting image given to extract the watermark by using at least one predetermined scaling factor;
• detecting a template watermark inserting area, into which at least one preset template watermark is inserted, based on the watermark extracting image rescaled by each scaling factor;
• synchronizing a geometric property of the watermark extracting image with a geometric property of an original image based on the scaling factor and the detected template watermark inserting area such that the geometric property of the watermark extracting image corresponds to the geometric property of the original image;
• and
• extracting a message watermark from a preset message watermark inserting area of the synchronized watermark extracting image.

An apparatus for inserting a watermark based on a template, the apparatus comprising:

• a determining unit configured to determine a template watermark inserting area and a message watermark inserting area in spatial domain of an image;
• an inserting unit configured to transform the determined template watermark inserting area into a frequency domain to insert at least one preset template watermark and to transform the determined message watermark inserting area into a frequency domain to insert a preset message watermark;
• and
• a transforming unit configured to transform the template watermark inserting area, into which the template watermark is inserted, into a spatial domain and to transform the message watermark inserting area, into which the message watermark is inserted, into a spatial domain.