Patent ID: 7356159
Filing Date: 2008-04-08
Classification: H04N

Abstract:
1. An apparatus for embedding imperceptible codes into digital image data comprising: a data divider to divide, per frame, digital image data into an “N” number of fields wherein “N” being an integer of 2 or more; a code producer to produce an “m” number of combinations of imperceptible codes, each combination having a first imperceptible code and a second imperceptible code, the first imperceptible code being one of the “m” number of first imperceptible codes, the second imperceptible code being one of the “m” number of second imperceptible codes given by a specific function with each first imperceptible code and a specific identification code as variables, in which the specific identification code is given by the specific function with the first and second imperceptible codes of each combination as variables wherein “m” being an integer of 2 or more and given by dividing “N” by an integer; and a code embeder to embed the first and second imperceptible codes of each combination into image data of each of the divided fields according to a specific rule of positional correspondence that defines a positional relationship between the first and second imperceptible codes of each combination when embedded in each field of one frame.