Method and apparatus for embedding message into image data

An image data processing method of extracting a message data that is embedded into encoded image data, the method comprising:

• dividing the image data into a plurality of color channels and obtaining a difference component between a first color channel and a second color channel of the plurality of color channels;
• and
• extracting the message data embedded into the image data from the difference component between the first color channel and the second color channel,
• wherein the above steps are performed by using a processor.

An image data processing apparatus comprising:

• a message generator configured to generate message data that is to be embedded into image data;
• a message embedder configured to divide the image data into a plurality of color channels resulting in a deconstruction of components of the image data and embed the message data into a difference component between a first color channel and a second color channel of the plurality of color channels;
• and
• an image reconstructor configured to reconstruct components of the first color channel and the second color channel by using original components of the two channels and the difference component between the two channels into which the message data is embedded, and reconstructing the image data by using reconstructed components of the two color channels and an original component of a remaining color channel of the plurality of color channels.